const http = require('http');
const path = require('path');
const fs = require('fs');
const crypto = require('crypto');
const { Server } = require('socket.io');

const PORT = process.env.PORT || 3001;
const BASE_PATH = '/Game';
const AI_SETTINGS_PATH = path.join(__dirname, 'data', 'ai-settings.json');
const ADMIN_PASSWORD = process.env.GAME_AI_ADMIN_PASSWORD || 'game-ai-admin';
const adminTokens = new Set();
/** Lobby หลังคดี — ไม่ลบออกจาก spaces ตอน prune รายการห้องว่าง */
const POST_CASE_LOBBY_SPACE_ID = 'mn8nx46h';
/** หลัง host เลือกผู้ต้องสงสัยแล้วกด «เริ่มสืบสวน» — ย้ายทุกคนไปฉากควิซนี้และเริ่มเกม */
const SUSPECT_INVESTIGATION_QUIZ_MAP_ID = 'mng8a80o';
/** ห้องสาธารณะที่สร้างแล้วไม่มีคนเข้าเกินนี้ → ลบออกจาก memory (Join Room ไม่โชว์ห้องผี) */
const SPACE_EMPTY_TTL_MS = 45000;
// Chat completion models from https://developers.openai.com/api/docs/models (Feb 2025)
const AI_MODELS = [
  'gpt-5.2', 'gpt-5.2-pro', 'gpt-5.1', 'gpt-5', 'gpt-5-pro', 'gpt-5-mini', 'gpt-5-nano',
  'gpt-4.1', 'gpt-4.1-mini', 'gpt-4.1-nano',
  'o3', 'o3-mini', 'o3-pro', 'o4-mini', 'o3-deep-research', 'o4-mini-deep-research',
  'o1', 'o1-mini', 'o1-pro',
  'gpt-4o', 'gpt-4o-mini', 'gpt-4-turbo', 'gpt-4',
  'gpt-3.5-turbo',
];

function loadAiSettings() {
  try {
    if (fs.existsSync(AI_SETTINGS_PATH)) {
      const raw = fs.readFileSync(AI_SETTINGS_PATH, 'utf8');
      return JSON.parse(raw);
    }
  } catch (e) { console.error('loadAiSettings', e.message); }
  return { openai_api_key: '', model: 'gpt-4o-mini', intent: '', rag_enabled: false, rag_context: '' };
}

function saveAiSettings(settings) {
  try {
    const dir = path.dirname(AI_SETTINGS_PATH);
    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
    fs.writeFileSync(AI_SETTINGS_PATH, JSON.stringify(settings, null, 2), 'utf8');
  } catch (e) { console.error('saveAiSettings', e.message); }
}

function getAdminToken(cookieHeader) {
  if (!cookieHeader) return null;
  const m = cookieHeader.match(/game_ai_admin=([^;\s]+)/);
  return m && adminTokens.has(m[1]) ? m[1] : null;
}

const MAPS_DIR = path.join(__dirname, 'data', 'maps');
const CHARACTERS_DIR = path.join(__dirname, 'data', 'characters');
/** ชื่อเลเยอร์ตรงกับ character.html / อัปโหลด (ลำดับวาดใน client) */
const CHAR_LAYER_MANIFEST_KEYS = ['shadow', 'bodyColor', 'bodyStroke', 'headColor', 'headStroke', 'hairColor', 'hairStroke', 'face'];
const CHAR_MANIFEST_DIRS = ['up', 'down', 'left', 'right'];

/** รายการไฟล์เลเยอร์ต่อทิศ/เฟรม — ให้หน้า character แก้ไขโหลด preview ได้ */
function buildCharacterLayerManifest(id, files) {
  if (!id || typeof id !== 'string') return { ok: false, error: 'bad id', byDir: {}, byDirIdle: {} };
  const esc = id.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
  const ext = /\.(png|jpg|jpeg|gif|webp)$/i;
  const layerAlt = CHAR_LAYER_MANIFEST_KEYS.join('|');
  const byDir = {};
  for (const dir of CHAR_MANIFEST_DIRS) {
    const multiRe = new RegExp('^' + esc + '_' + dir + '_(\\d+)_layer_(' + layerAlt + ')\\.(png|jpg|jpeg|gif|webp)$', 'i');
    const singleRe = new RegExp('^' + esc + '_' + dir + '_layer_(' + layerAlt + ')\\.(png|jpg|jpeg|gif|webp)$', 'i');
    const multiHits = files.filter((f) => multiRe.test(f));
    if (multiHits.length) {
      let maxFi = -1;
      const perFrame = new Map();
      multiHits.forEach((f) => {
        const m = f.match(multiRe);
        if (!m) return;
        const fi = parseInt(m[1], 10);
        if (!Number.isFinite(fi) || fi < 0 || fi > 200) return;
        const layer = m[2];
        if (fi > maxFi) maxFi = fi;
        if (!perFrame.has(fi)) perFrame.set(fi, {});
        perFrame.get(fi)[layer] = f;
      });
      const frames = [];
      for (let i = 0; i <= maxFi; i++) frames.push(perFrame.get(i) || {});
      byDir[dir] = { multi: true, frames };
    } else {
      const frame0 = {};
      files.forEach((f) => {
        if (!f.startsWith(id + '_' + dir + '_layer_') || !ext.test(f)) return;
        const m = f.match(singleRe);
        if (m) frame0[m[1]] = f;
      });
      if (Object.keys(frame0).length) byDir[dir] = { multi: false, frames: [frame0] };
    }
  }
  const byDirIdle = {};
  for (const dir of CHAR_MANIFEST_DIRS) {
    const multiIdleRe = new RegExp('^' + esc + '_' + dir + '_idle_(\\d+)_layer_(' + layerAlt + ')\\.(png|jpg|jpeg|gif|webp)$', 'i');
    const singleIdleRe = new RegExp('^' + esc + '_' + dir + '_idle_layer_(' + layerAlt + ')\\.(png|jpg|jpeg|gif|webp)$', 'i');
    const multiIdleHits = files.filter((f) => multiIdleRe.test(f));
    if (multiIdleHits.length) {
      let maxFi = -1;
      const perFrame = new Map();
      multiIdleHits.forEach((f) => {
        const m = f.match(multiIdleRe);
        if (!m) return;
        const fi = parseInt(m[1], 10);
        if (!Number.isFinite(fi) || fi < 0 || fi > 200) return;
        const layer = m[2];
        if (fi > maxFi) maxFi = fi;
        if (!perFrame.has(fi)) perFrame.set(fi, {});
        perFrame.get(fi)[layer] = f;
      });
      const frames = [];
      for (let i = 0; i <= maxFi; i++) frames.push(perFrame.get(i) || {});
      byDirIdle[dir] = { multi: true, frames };
    } else {
      const frame0 = {};
      files.forEach((f) => {
        if (!f.startsWith(id + '_' + dir + '_idle_layer_') || !ext.test(f)) return;
        const m = f.match(singleIdleRe);
        if (m) frame0[m[1]] = f;
      });
      if (Object.keys(frame0).length) byDirIdle[dir] = { multi: false, frames: [frame0] };
    }
  }
  return { ok: true, id, byDir, byDirIdle };
}

/** ต้องอยู่ใต้ public/img/ เพื่อให้ nginx (alias /Game/ → Game/public) เสิร์ฟ GET /Game/img/gauntlet-assets/* ได้ — เดิมเก็บใน data/ จะถูกคัดลอกมาครั้งแรก */
const GAUNTLET_ASSETS_DIR = path.join(__dirname, 'public', 'img', 'gauntlet-assets');
const GAUNTLET_ASSETS_DIR_LEGACY = path.join(__dirname, 'data', 'gauntlet-assets');
const GAUNTLET_ASSETS_META_PATH = path.join(__dirname, 'data', 'gauntlet-assets-meta.json');
/** ต้องอยู่ใต้ public/ เพื่อให้ nginx (alias /Game/ → Game/public) เสิร์ฟรูปได้ — อย่าใช้ data/ */
const QUIZ_CARRY_PLAQUE_ASSETS_DIR = path.join(__dirname, 'public', 'img', 'quiz-carry-plaque-assets');
const QUIZ_SETTINGS_PATH = path.join(__dirname, 'data', 'quiz-settings.json');
/** ถ้า Admin (PHP) merge ลงไฟล์ใต้ docroot แต่ Node รันจากโฟลเดอร์อื่น ให้ตั้ง absolute path ที่นี่ — carry* / ธีมแผงจะอ่านทับจาก mirror ทุกครั้งที่ loadQuizSettings */
const QUIZ_SETTINGS_MIRROR_PATH = process.env.GAME_QUIZ_SETTINGS_MIRROR_PATH
  ? path.resolve(String(process.env.GAME_QUIZ_SETTINGS_MIRROR_PATH).trim())
  : '';
const GAME_TIMING_PATH = path.join(__dirname, 'data', 'game-timing.json');
/** ช่องตัวเลือกบนกริด quiz_carry เก็บเลข 1..N (ไม่ใช่แค่ 0/1 เหมือน hub) */
const QUIZ_CARRY_MAX_OPTION_SLOTS = 16;
const maps = new Map();
const defaultMap = () => ({
  width: 20, height: 15, tileSize: 32, gameType: 'zep',
  characterCells: 1, characterCellsW: 1, characterCellsH: 1,
  /** กล่องตรวจทับโซน «ห้ามซ้อน» (ชิดเท้า+กลางแนวนอน เหมือนชนกำแพง) · 0 = เต็มความกว้าง/สูงตัว */
  blockPlayerSeparationW: 0,
  blockPlayerSeparationH: 0,
  ground: [], objects: [], blockPlayer: [], interactive: [], startGameArea: [], spawnArea: [], spawn: { x: 1, y: 1 },
  gridImageLibrary: [],
  gridImageSprites: [],
  gridImageCells: [],
  quizTrueArea: [], quizFalseArea: [], quizQuestionArea: [], quizQuestions: [],
  quizCarryHubArea: [], quizCarryOptionArea: [],
  /** quiz_carry embed: โซนวาง UI นับ 3-2-1 (0/1) — ใช้เมื่อ carryEmbedCountdownAnchor === 'grid' */
  carryEmbedCountdownArea: [],
  /** Quiz Battle (MCQ โดม) — ช่องที่ 1 = จุดกด E เปิดคำถามจาก battleQuizMcq */
  quizBattleDomeArea: [],
  /** Quiz Battle — ถ้าวาดอย่างน้อย 1 ช่อง = จำกัดเดินเฉพาะเส้นทาง (เหมือนแผนที่อ้างอิง) · ไม่วาด = เดินอิสระเหมือนเดิม */
  quizBattlePathArea: [],
  stackReleaseArea: [], stackLandArea: [],
  /** กระโดดให้รอด — แพลตฟอร์มในระบบ tile (ร่างสำหรับ side-view ภายหลัง) */
  jumpSurvivePlatforms: [],
  jumpSurvivePlatformArea: [],
  jumpSurviveRisePxPerSec: 42,
  jumpSurviveGravity: 3200,
  /** 0 = ให้ไคลเอนต์ใช้ค่าเริ่มต้นกระโดดสูง; ตั้งเป็นพิกเซล/วิ (เช่น 980) เพื่อกำหนดเอง */
  jumpSurviveJumpImpulse: 0,
  jumpSurviveMovePxPerSec: 200,
});

function defaultQuizSettings() {
  return {
    readMs: 10000,
    answerMs: 5000,
    betweenMs: 3500,
    /** quiz_carry: โชว์เฉพาะคำถามก่อน (มิลลิวิ) แล้วค่อยให้หยิบตัวเลือก — 0 = ไม่รอ */
    carryReadMs: 3000,
    /** quiz_carry: หลังตัวเลือกขึ้น ให้เวลาตอบ (มิลลิวิ) */
    carryAnswerMs: 5000,
    /** quiz_carry: จำนวนข้อต่อเซสชันก่อนจบเกม (พรีวิว) — 0 = ไม่จบอัตโนมัติ */
    carrySessionLength: 0,
    /** quiz_carry: สีแผง #quiz-map-question-panel ในเกม/พรีวิว (จัดใน Admin แท็บหยิบมาวาง) */
    carryMapPanelTheme: defaultCarryMapPanelTheme(),
    /** เกมตอบคำถามถูก/ผิด: สีแผงคำถามบนแผนที่ (#quiz-map-question-panel) — Admin แท็บคำถามเกม */
    quizMapPanelTheme: defaultCarryMapPanelTheme(),
    /** quiz_carry: สี/ขอบ/ขนาดตัวเลขนับ 3-2-1 (embed พรีวิว) — Admin แท็บหยิบมาวาง */
    carryEmbedCountdownTheme: defaultCarryEmbedCountdownTheme(),
    /** quiz_carry: สีป้ายตัวเลือกบนแผนที่ (canvas) ต่อช่อง 1–16 */
    carryChoicePlaqueThemes: defaultCarryChoicePlaqueThemes(),
    /** legacy: ช่องแรกเท่ากับ carryChoicePlaqueThemes[0] */
    carryChoicePlaqueTheme: defaultCarryChoicePlaqueTheme(),
    /** quiz_carry: ขยายป้ายตัวเลือกบนแมป (กว้าง/สูง/ฟอนต์) — 0.85–2.5 */
    carryChoicePlaqueMapScale: 1.25,
    /** quiz_carry: ถ้าใส่รหัสฉาก + คูณ — เดินเร็วเฉพาะแมปนั้น (เทียบกับค่าเริ่มในไคลเอนต์) */
    carryWalkSpeedMultForMapId: '',
    carryWalkSpeedMult: null,
    /** ถูก/ผิด: สุ่มกี่ข้อต่อรอบจากชุดคำถาม (สูงสุดเท่าที่มีในชุด) */
    quizRoundQuestionCount: 10,
    questions: [],
    carryQuestions: [],
    battleQuizMcq: [],
  };
}

function defaultCarryMapPanelTheme() {
  return {
    panelBg: 'rgba(12, 14, 28, 0.88)',
    panelBorder: 'rgba(255, 214, 102, 0.7)',
    borderWidthPx: 2,
    textColor: '#f1f5f9',
    questionFontMinPx: 10,
    questionFontMaxPx: 24,
  };
}

function sanitizeCssColorToken(input, fallback) {
  const t = String(input == null ? '' : input).trim().slice(0, 120);
  if (!t) return fallback;
  if (/url\s*\(|expression\s*\(|@import|\/\*|javascript|<|>|\\0/i.test(t)) return fallback;
  if (/^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$/.test(t)) return t;
  if (/^rgba?\(\s*[^)]+\)$/i.test(t)) {
    const inner = t.replace(/^rgba?\(\s*/i, '').replace(/\)\s*$/, '');
    if (inner.length <= 96 && /^[0-9\s.,%+-]+$/.test(inner)) return t.replace(/\s+/g, ' ').trim();
  }
  return fallback;
}

function sanitizeCarryMapPanelTheme(raw) {
  const d = defaultCarryMapPanelTheme();
  if (!raw || typeof raw !== 'object') return d;
  let qMin = Number(raw.questionFontMinPx);
  let qMax = Number(raw.questionFontMaxPx);
  if (!Number.isFinite(qMin)) qMin = d.questionFontMinPx;
  if (!Number.isFinite(qMax)) qMax = d.questionFontMaxPx;
  qMin = Math.round(Math.max(10, Math.min(40, qMin)));
  qMax = Math.round(Math.max(14, Math.min(56, qMax)));
  if (qMax < qMin) {
    const t = qMin;
    qMin = qMax;
    qMax = t;
  }
  return {
    panelBg: sanitizeCssColorToken(raw.panelBg, d.panelBg),
    panelBorder: sanitizeCssColorToken(raw.panelBorder, d.panelBorder),
    borderWidthPx: (() => {
      let w = Number(raw.borderWidthPx);
      if (!Number.isFinite(w)) w = d.borderWidthPx;
      return Math.max(0, Math.min(12, Math.round(w)));
    })(),
    textColor: sanitizeCssColorToken(raw.textColor, d.textColor),
    questionFontMinPx: qMin,
    questionFontMaxPx: qMax,
  };
}

/** ป้ายตัวเลือกบนแผนที่ (canvas) — quiz_carry */
function defaultCarryChoicePlaqueTheme() {
  return {
    borderMode: 'neon',
    fixedBorder: 'rgba(122, 200, 255, 0.9)',
    fillBg: 'rgba(12, 10, 20, 0.88)',
    textColor: 'rgba(248, 249, 255, 1)',
    borderWidthPx: 2.5,
  };
}

function sanitizeCarryChoicePlaqueTheme(raw) {
  const d = defaultCarryChoicePlaqueTheme();
  if (!raw || typeof raw !== 'object' || Array.isArray(raw)) return sanitizeCarryChoicePlaqueTheme({});
  const mode = String(raw.borderMode || '').toLowerCase() === 'fixed' ? 'fixed' : 'neon';
  let bw = Number(raw.borderWidthPx);
  if (!Number.isFinite(bw)) bw = d.borderWidthPx;
  bw = Math.round(Math.max(0, Math.min(8, bw)) * 10) / 10;
  return {
    borderMode: mode,
    fixedBorder: sanitizeCssColorToken(raw.fixedBorder, d.fixedBorder),
    fillBg: sanitizeCssColorToken(raw.fillBg, d.fillBg),
    textColor: sanitizeCssColorToken(raw.textColor, d.textColor),
    borderWidthPx: bw,
    plaqueImageUrl: sanitizeCarryChoiceImageUrl(raw.plaqueImageUrl),
  };
}

const QUIZ_CARRY_PLAQUE_THEME_SLOTS = 16;

function defaultCarryChoicePlaqueThemes() {
  const out = [];
  for (let i = 0; i < QUIZ_CARRY_PLAQUE_THEME_SLOTS; i++) {
    out.push(sanitizeCarryChoicePlaqueTheme({}));
  }
  return out;
}

/** อาร์เรย์ 16 ช่อง — รับได้ทั้ง carryChoicePlaqueThemes หรืออ็อบเจ็กต์เดียว (legacy) */
function sanitizeCarryChoicePlaqueThemes(raw) {
  if (Array.isArray(raw) && raw.length > 0) {
    const out = [];
    for (let i = 0; i < QUIZ_CARRY_PLAQUE_THEME_SLOTS; i++) {
      out.push(sanitizeCarryChoicePlaqueTheme(raw[i] || {}));
    }
    return out;
  }
  if (raw != null && typeof raw === 'object' && !Array.isArray(raw)) {
    const one = sanitizeCarryChoicePlaqueTheme(raw);
    return Array.from({ length: QUIZ_CARRY_PLAQUE_THEME_SLOTS }, () => ({ ...one }));
  }
  return defaultCarryChoicePlaqueThemes();
}

function sanitizeCarryChoiceImageUrl(input) {
  const s = String(input == null ? '' : input).trim().slice(0, 512);
  if (!s) return '';
  if (/[\s<>'"`]/.test(s)) return '';
  if (s.startsWith('/')) {
    if (!/^\/[\w\-./?#=&%+]+$/i.test(s)) return '';
    return s;
  }
  const low = s.toLowerCase();
  if (!low.startsWith('https://') && !low.startsWith('http://')) return '';
  try {
    const u = new URL(s);
    if (u.protocol !== 'http:' && u.protocol !== 'https:') return '';
    return s;
  } catch (e) {
    return '';
  }
}

function defaultCarryEmbedCountdownTheme() {
  return {
    overlayBackdrop: 'rgba(8, 10, 20, 0.42)',
    innerBg: 'rgba(12, 14, 28, 0.82)',
    innerBorder: 'rgba(122, 162, 247, 0.45)',
    innerBorderWpx: 1,
    innerRadiusPx: 12,
    digitColor: '#ffe066',
    mapDigitCqmin: 78,
    mapDigitCqh: 82,
    mapDigitMaxPx: 200,
    screenDigitVw: 28,
    screenDigitMaxPx: 132,
  };
}

function sanitizeCarryEmbedCountdownTheme(raw) {
  const d = defaultCarryEmbedCountdownTheme();
  if (!raw || typeof raw !== 'object') return d;
  const clampN = (v, lo, hi, def) => {
    const n = Number(v);
    if (!Number.isFinite(n)) return def;
    return Math.max(lo, Math.min(hi, Math.round(n)));
  };
  return {
    overlayBackdrop: sanitizeCssColorToken(raw.overlayBackdrop, d.overlayBackdrop),
    innerBg: sanitizeCssColorToken(raw.innerBg, d.innerBg),
    innerBorder: sanitizeCssColorToken(raw.innerBorder, d.innerBorder),
    innerBorderWpx: clampN(raw.innerBorderWpx, 0, 12, d.innerBorderWpx),
    innerRadiusPx: clampN(raw.innerRadiusPx, 0, 32, d.innerRadiusPx),
    digitColor: sanitizeCssColorToken(raw.digitColor, d.digitColor),
    mapDigitCqmin: clampN(raw.mapDigitCqmin, 35, 100, d.mapDigitCqmin),
    mapDigitCqh: clampN(raw.mapDigitCqh, 35, 100, d.mapDigitCqh),
    mapDigitMaxPx: clampN(raw.mapDigitMaxPx, 48, 400, d.mapDigitMaxPx),
    screenDigitVw: clampN(raw.screenDigitVw, 6, 44, d.screenDigitVw),
    screenDigitMaxPx: clampN(raw.screenDigitMaxPx, 48, 220, d.screenDigitMaxPx),
  };
}

/** หมวด Quiz Battle (อ้างอิงธีมหน้า Quiz-Battle) — id ต้องตรงกับแอดมิน */
const QUIZ_BATTLE_CATEGORY_IDS = new Set([
  'cybercrime',
  'cyber_law',
  'privacy',
  'digital_security',
  'social_media',
  'ethics',
  'ai_data',
]);

/** คำถาม 3 ตัวเลือก A/B/C แยกหมวด — สำหรับโหมด Quiz Battle / โดม */
function sanitizeBattleQuizMcq(arr) {
  if (!Array.isArray(arr)) return [];
  const out = [];
  for (const q of arr) {
    if (!q || typeof q !== 'object') continue;
    let categoryId = String(q.categoryId || '').trim();
    if (!categoryId || !QUIZ_BATTLE_CATEGORY_IDS.has(categoryId)) {
      categoryId = 'cybercrime';
    }
    const text = String(q.text || '').trim().slice(0, 500);
    if (!text) continue;
    const rawChoices = Array.isArray(q.choices) ? q.choices : [];
    const choices = rawChoices.map((c) => String(c || '').trim().slice(0, 160));
    if (choices.length !== 3 || !choices.every(Boolean)) continue;
    let ci = Number(q.correctIndex);
    if (!Number.isFinite(ci)) ci = 0;
    ci = Math.max(0, Math.min(2, Math.floor(ci)));
    out.push({ categoryId, text, choices, correctIndex: ci });
    if (out.length >= 200) break;
  }
  return out;
}

/** คำถามแบบหลายตัวเลือก (หยิบมาวาง / quiz_carry) — เก็บใน quiz-settings.json */
function sanitizeCarryQuestions(arr) {
  if (!Array.isArray(arr)) return [];
  const out = [];
  for (const q of arr) {
    if (!q || typeof q !== 'object') continue;
    const text = String(q.text || '').trim().slice(0, 500);
    if (!text) continue;
    let choices = Array.isArray(q.choices)
      ? q.choices.map((c) => String(c || '').trim().slice(0, 160)).filter(Boolean)
      : [];
    if (choices.length < 2) continue;
    if (choices.length > 16) choices = choices.slice(0, 16);
    let ci = Number(q.correctIndex);
    if (!Number.isFinite(ci)) ci = 0;
    ci = Math.max(0, Math.min(choices.length - 1, Math.floor(ci)));
    const row = { text, choices, correctIndex: ci };
    if (Array.isArray(q.choiceImageUrls) && q.choiceImageUrls.length) {
      const urls = choices.map((_, idx) => sanitizeCarryChoiceImageUrl(q.choiceImageUrls[idx]));
      if (urls.some((u) => u)) row.choiceImageUrls = urls;
    }
    out.push(row);
    if (out.length >= 80) break;
  }
  return out;
}

function clampQuizMs(n, def) {
  const v = Number(n);
  if (Number.isNaN(v)) return def;
  return Math.max(1000, Math.min(300000, Math.floor(v)));
}

function clampQuizBetweenMs(n, def) {
  const v = Number(n);
  if (Number.isNaN(v)) return def;
  return Math.max(0, Math.min(300000, Math.floor(v)));
}

function clampCarrySessionLength(n, def) {
  const v = Number(n);
  if (Number.isNaN(v)) return def;
  return Math.max(0, Math.min(500, Math.floor(v)));
}

/** เกมตอบคำถามถูก/ผิด: จำนวนข้อที่สุ่มจากชุดต่อรอบ (เซสชัน) — 1–50 */
function clampQuizRoundQuestionCount(n, def) {
  const v = Number(n);
  if (!Number.isFinite(v)) {
    const d = Number(def);
    if (!Number.isFinite(d)) return 10;
    return Math.max(1, Math.min(50, Math.floor(d)));
  }
  return Math.max(1, Math.min(50, Math.floor(v)));
}

function clampCarryChoicePlaqueMapScale(n, def) {
  const v = Number(n);
  if (Number.isNaN(v)) return def;
  return Math.round(Math.max(0.85, Math.min(2.5, v)) * 100) / 100;
}

/** รหัสฉาก (เช่น mnorwqx1) — ว่าง = ไม่ใช้คูณเดินแยกแมป */
function sanitizeCarryWalkSpeedMultForMapId(raw) {
  const t = String(raw == null ? '' : raw).trim().slice(0, 64);
  if (!t) return '';
  if (!/^[a-zA-Z0-9_-]+$/.test(t)) return '';
  return t;
}

/** quiz_carry: คูณความเร็วเดินเมื่อ map id ตรง — null = ไม่ตั้ง */
function clampCarryWalkSpeedMultSetting(n) {
  if (n === null || n === undefined || n === '') return null;
  const v = Number(n);
  if (Number.isNaN(v)) return null;
  return Math.round(Math.max(0.5, Math.min(3, v)) * 100) / 100;
}

function mergeQuizCarryFromMirrorIfSet(base) {
  if (!QUIZ_SETTINGS_MIRROR_PATH) return base;
  try {
    if (!fs.existsSync(QUIZ_SETTINGS_MIRROR_PATH)) return base;
    const raw = fs.readFileSync(QUIZ_SETTINGS_MIRROR_PATH, 'utf8');
    const j = JSON.parse(raw);
    if (!j || typeof j !== 'object') return base;
    if (j.carryMapPanelTheme != null && typeof j.carryMapPanelTheme === 'object') {
      base.carryMapPanelTheme = sanitizeCarryMapPanelTheme(j.carryMapPanelTheme);
    }
    if (j.quizMapPanelTheme != null && typeof j.quizMapPanelTheme === 'object') {
      base.quizMapPanelTheme = sanitizeCarryMapPanelTheme(j.quizMapPanelTheme);
    }
    if (j.carryReadMs != null) {
      base.carryReadMs = clampQuizBetweenMs(j.carryReadMs, base.carryReadMs);
    }
    if (j.carryAnswerMs != null) {
      base.carryAnswerMs = clampQuizMs(j.carryAnswerMs, base.carryAnswerMs);
    }
    if (j.carrySessionLength != null) {
      base.carrySessionLength = clampCarrySessionLength(j.carrySessionLength, base.carrySessionLength);
    }
    if (j.carryWalkSpeedMultForMapId != null) {
      base.carryWalkSpeedMultForMapId = sanitizeCarryWalkSpeedMultForMapId(j.carryWalkSpeedMultForMapId);
    }
    if (j.carryWalkSpeedMult != null) {
      const wm = clampCarryWalkSpeedMultSetting(j.carryWalkSpeedMult);
      if (wm != null) base.carryWalkSpeedMult = wm;
    }
    if (j.carryEmbedCountdownTheme != null && typeof j.carryEmbedCountdownTheme === 'object') {
      base.carryEmbedCountdownTheme = sanitizeCarryEmbedCountdownTheme(j.carryEmbedCountdownTheme);
    }
    if (Array.isArray(j.carryChoicePlaqueThemes) && j.carryChoicePlaqueThemes.length) {
      base.carryChoicePlaqueThemes = sanitizeCarryChoicePlaqueThemes(j.carryChoicePlaqueThemes);
      base.carryChoicePlaqueTheme = base.carryChoicePlaqueThemes[0];
    } else if (j.carryChoicePlaqueTheme != null && typeof j.carryChoicePlaqueTheme === 'object') {
      base.carryChoicePlaqueThemes = sanitizeCarryChoicePlaqueThemes(j.carryChoicePlaqueTheme);
      base.carryChoicePlaqueTheme = base.carryChoicePlaqueThemes[0];
    }
    if (Array.isArray(j.carryQuestions) && j.carryQuestions.length) {
      base.carryQuestions = sanitizeCarryQuestions(j.carryQuestions);
    }
    if (j.quizRoundQuestionCount != null) {
      base.quizRoundQuestionCount = clampQuizRoundQuestionCount(j.quizRoundQuestionCount, base.quizRoundQuestionCount);
    }
    return base;
  } catch (e) {
    console.error('mergeQuizCarryFromMirrorIfSet', e.message);
    return base;
  }
}

function loadQuizSettings() {
  try {
    if (fs.existsSync(QUIZ_SETTINGS_PATH)) {
      const j = JSON.parse(fs.readFileSync(QUIZ_SETTINGS_PATH, 'utf8'));
      const d = defaultQuizSettings();
      const questions = Array.isArray(j.questions) ? j.questions : [];
      const carryQuestions = sanitizeCarryQuestions(j.carryQuestions);
      const battleQuizMcq = sanitizeBattleQuizMcq(j.battleQuizMcq);
      const carryMapPanelTheme = sanitizeCarryMapPanelTheme(j.carryMapPanelTheme);
      const quizMapPanelTheme = sanitizeCarryMapPanelTheme(j.quizMapPanelTheme);
      const carryEmbedCountdownTheme = sanitizeCarryEmbedCountdownTheme(j.carryEmbedCountdownTheme);
      const carryChoicePlaqueThemes = Array.isArray(j.carryChoicePlaqueThemes) && j.carryChoicePlaqueThemes.length
        ? sanitizeCarryChoicePlaqueThemes(j.carryChoicePlaqueThemes)
        : sanitizeCarryChoicePlaqueThemes(j.carryChoicePlaqueTheme);
      const carryChoicePlaqueTheme = carryChoicePlaqueThemes[0];
      const carryChoicePlaqueMapScale = clampCarryChoicePlaqueMapScale(j.carryChoicePlaqueMapScale, d.carryChoicePlaqueMapScale);
      const carryWalkSpeedMultForMapId = sanitizeCarryWalkSpeedMultForMapId(j.carryWalkSpeedMultForMapId);
      let carryWalkSpeedMult = clampCarryWalkSpeedMultSetting(j.carryWalkSpeedMult);
      if (!carryWalkSpeedMultForMapId) carryWalkSpeedMult = null;
      else if (carryWalkSpeedMult == null) carryWalkSpeedMult = clampCarryWalkSpeedMultSetting(1.42);
      const out = {
        readMs: clampQuizMs(j.readMs, d.readMs),
        answerMs: clampQuizMs(j.answerMs, d.answerMs),
        betweenMs: clampQuizBetweenMs(j.betweenMs, d.betweenMs),
        carryReadMs: clampQuizBetweenMs(j.carryReadMs, d.carryReadMs),
        carryAnswerMs: clampQuizMs(j.carryAnswerMs, d.carryAnswerMs),
        carrySessionLength: clampCarrySessionLength(j.carrySessionLength, d.carrySessionLength),
        carryMapPanelTheme,
        quizMapPanelTheme,
        carryEmbedCountdownTheme,
        carryChoicePlaqueThemes,
        carryChoicePlaqueTheme,
        carryChoicePlaqueMapScale,
        carryWalkSpeedMultForMapId,
        carryWalkSpeedMult,
        quizRoundQuestionCount: clampQuizRoundQuestionCount(j.quizRoundQuestionCount, d.quizRoundQuestionCount),
        questions,
        carryQuestions,
        battleQuizMcq,
      };
      return mergeQuizCarryFromMirrorIfSet(out);
    }
  } catch (e) { console.error('loadQuizSettings', e.message); }
  return mergeQuizCarryFromMirrorIfSet(defaultQuizSettings());
}

const GAUNTLET_DEFAULT_TICK_MS = 220;
const GAUNTLET_DEFAULT_JUMP_TICKS = 16;
const GAUNTLET_DEFAULT_TIME_LIMIT_SEC = 0;
/** รอบสวิงซ้าย-ขวา ต่อวินาที (Stack) — ค่าน้อย = ช้า · cycles per second of horizontal swing */
const STACK_SWING_HZ_DEFAULT = 0.55;

function defaultGameTiming() {
  return {
    gauntletTickMs: GAUNTLET_DEFAULT_TICK_MS,
    gauntletJumpTicks: GAUNTLET_DEFAULT_JUMP_TICKS,
    gauntletTimeLimitSec: GAUNTLET_DEFAULT_TIME_LIMIT_SEC,
    ...defaultGauntletVisuals(),
    stackSwingHz: STACK_SWING_HZ_DEFAULT,
    stackBlockWidthTiles: null,
    /** กระโดดให้รอด: ความสูงกระโดด = ทวีคูณ × ความสูงตัวละคร (tile) — 0.5–4 ค่าเริ่ม 1.5 */
    jumpSurviveJumpHeightMult: 1.5,
    /** จำกัดเวลารอบภารกิจ/มินิเกมกระโดดขึ้นแท่น (วินาที) — 0 = ไคลเอนต์ใช้ 60 วิ; ไม่ใช่ค่าเดียวกับพรมแดง */
    jumpSurviveMissionTimeSec: 0,
    /** Stack ภารกิจ Tower (mnn93hpi): จำกัดเวลารอบ (วินาที) — ไคลเอนต์ใช้เมื่อเล่นภารกิจ */
    stackTowerMissionTimeSec: 90,
    /** Stack ภารกิจ Tower: ทีมพลาดได้กี่ครั้งก่อนจบ (ไม่รีเซ็ตหอ) */
    stackTeamMissesMax: 3,
    /** Stack ภารกิจ Tower: จำนวนชั้นสำเร็จ (ไม่คิดคอมโบ) ที่รวมแล้วได้ Progress 100% — แต่ละชั้น +100/N %; คอมโบ ×2 ของชั้นนั้น */
    stackTowerProgressBlocks: 50,
    stackBlockNormalImageUrls: ['', '', '', '', '', ''],
    stackBlockHeavyImageUrls: ['', '', '', '', '', ''],
    /** โอกาสใช้รูป “ใหญ่” ต่อการปล่อยหนึ่งครั้ง (0–100) — ถ้าไม่มี URL ใหญ่ช่องนั้น = ใช้ปกติ */
    stackHeavyBlockPercent: 35,
    /** ยิงยานอวกาศ / space_shooter: จำกัดเวลารอบ (วินาที) — 0 = ไคลเอนต์ใช้ค่าเริ่ม 90; แมป spaceShooterTimeSec > 0 ทับ */
    spaceShooterMissionTimeSec: 0,
    spaceShooterShipImageUrls: ['', '', '', '', '', ''],
    spaceShooterAsteroidSpriteUrls: [],
    spaceShooterAsteroidExplodeFrameMs: 70,
    /** ระยะห่างเกิดอุกาบาต (ms) — ค่าน้อย = ถี่ขึ้น; แมป spaceShooterAsteroidIntervalMs ≥200 ทับ */
    spaceShooterAsteroidIntervalMs: 1040,
    spaceShooterShipDamageOverlayUrls: ['', '', ''],
    /** balloon_boss / Mega Virus — 0 = ไคลเอนต์ใช้ 120 วิเมื่อแมปไม่ตั้ง balloonBossTimeSec */
    balloonBossMissionTimeSec: 0,
    balloonBossBossImageUrl: '',
    balloonBossPlayerBalloonImageUrls: ['', '', '', '', '', ''],
    /** กรอบฟองรอบผู้เล่น / ลูกโป่ง fallback เริ่มต้น — Artboard 9 (วง cyan +หาง) */
    balloonBossPlayerBalloonFallbackUrl: '/Game/img/MegaVirus/Artboard 9.png',
  };
}

function clampStackSwingHz(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return STACK_SWING_HZ_DEFAULT;
  return Math.max(0.08, Math.min(2.8, v));
}

/** ความกว้างบล็อก Stack เป็น tile — null = ให้ client คำนวณจากพื้นที่ลงบนแผนที่ */
function clampStackBlockWidthTiles(n) {
  if (n === null || n === undefined || n === '') return null;
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return null;
  return Math.round(Math.max(0.85, Math.min(3.2, v)) * 100) / 100;
}

function clampStackTowerMissionTimeSec(n) {
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return 90;
  return Math.max(10, Math.min(7200, Math.floor(v)));
}

function clampStackTeamMissesMax(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 3;
  return Math.max(1, Math.min(20, Math.floor(v)));
}

function clampStackTowerProgressBlocks(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 50;
  return Math.max(1, Math.min(500, Math.floor(v)));
}

/** Stack: รูปบล็อกต่อที่นั่ง 1–6 (ปกติ / ใหญ่) — ว่าง = ไคลเอนต์วาดสีเดิม */
function normalizeStackBlockSixImageUrls(val) {
  let arr = val;
  if (typeof arr === 'string') {
    try {
      const p = JSON.parse(arr);
      if (Array.isArray(p)) arr = p;
    } catch (e) {
      arr = arr.split(/[\n\r]+/);
    }
  }
  if (!Array.isArray(arr)) arr = [];
  const out = [];
  for (let i = 0; i < 6; i++) {
    out.push(sanitizeGauntletAssetUrl(arr[i]));
  }
  return out;
}

function clampStackHeavyBlockPercent(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 35;
  return Math.max(0, Math.min(100, Math.floor(v)));
}

function clampJumpSurviveJumpHeightMult(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 1.5;
  return Math.round(Math.max(0.5, Math.min(4, v)) * 100) / 100;
}

/** กระโดดขึ้นแท่น / ภารกิจ Jumper: จำกัดเวลารอบ (วินาที) — 0 = ไม่ตั้งในไฟล์ ให้ไคลเอนต์ใช้ค่าเริ่ม 60; ค่าอื่น = 10–7200 */
function clampJumpSurviveMissionTimeSec(n) {
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return 0;
  return Math.max(10, Math.min(7200, Math.floor(v)));
}

function clampSpaceShooterMissionTimeSec(n) {
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return 0;
  return Math.max(10, Math.min(7200, Math.floor(v)));
}

/** รูปยาน space_shooter ช่อง 1–6 (ตรงกับ spawn slot บนแมป) — ว่าง = ไคลเอนต์วาดยานเวกเตอร์ */
function normalizeSpaceShooterShipImageUrls(val) {
  let arr = val;
  if (typeof arr === 'string') {
    try {
      const p = JSON.parse(arr);
      if (Array.isArray(p)) arr = p;
    } catch (e) {
      arr = arr.split(/[\n\r]+/);
    }
  }
  if (!Array.isArray(arr)) arr = [];
  const out = [];
  for (let i = 0; i < 6; i++) {
    out.push(sanitizeGauntletAssetUrl(arr[i]));
  }
  return out;
}

/** อุกาบาต space_shooter: บรรทัดแรก = ตอนตก, ถัดไป = เฟรมแตก (สูงสุด 32 URL) */
function normalizeSpaceShooterAsteroidSpriteUrls(val) {
  let arr = val;
  if (typeof arr === 'string') {
    try {
      const p = JSON.parse(arr);
      if (Array.isArray(p)) arr = p;
    } catch (e) {
      arr = arr.split(/[\n\r]+/);
    }
  }
  if (!Array.isArray(arr)) arr = [];
  const out = [];
  for (let i = 0; i < arr.length && out.length < 32; i++) {
    const u = sanitizeGauntletAssetUrl(arr[i]);
    if (u) out.push(u);
  }
  return out;
}

function clampSpaceShooterAsteroidExplodeFrameMs(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 70;
  return Math.max(30, Math.min(500, Math.round(v)));
}

const SPACE_SHOOTER_ASTEROID_INTERVAL_MS_DEFAULT = 1040;
function clampSpaceShooterAsteroidIntervalMs(n) {
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return SPACE_SHOOTER_ASTEROID_INTERVAL_MS_DEFAULT;
  return Math.max(200, Math.min(10000, Math.floor(v)));
}

/** รูปทับยานเมื่อชนอุกาบาต ครั้งที่ 1–3 (ภารกิจ Violent Crime) */
function normalizeSpaceShooterShipDamageOverlayUrls(val) {
  let arr = val;
  if (typeof arr === 'string') {
    try {
      const p = JSON.parse(arr);
      if (Array.isArray(p)) arr = p;
    } catch (e) {
      arr = arr.split(/[\n\r]+/);
    }
  }
  if (!Array.isArray(arr)) arr = [];
  const out = ['', '', ''];
  for (let i = 0; i < 3; i++) {
    out[i] = sanitizeGauntletAssetUrl(arr[i]);
  }
  return out;
}

function clampGauntletTickMs(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return GAUNTLET_DEFAULT_TICK_MS;
  return Math.max(80, Math.min(800, Math.floor(v)));
}

function clampGauntletJumpTicks(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return GAUNTLET_DEFAULT_JUMP_TICKS;
  return Math.max(4, Math.min(40, Math.floor(v)));
}

/** 0 = ไม่จำกัดเวลา · ค่าอื่น = วินาที (สูงสุด 2 ชม.) */
function clampGauntletTimeLimitSec(n) {
  const v = Number(n);
  if (Number.isNaN(v) || v <= 0) return 0;
  return Math.max(10, Math.min(7200, Math.floor(v)));
}

function defaultGauntletVisuals() {
  return {
    gauntletLaneImageUrls: [],
    gauntletLaserTopUrl: '',
    gauntletLaserBottomUrl: '',
    gauntletLaserLineUrl: '',
    gauntletLaserFillColor: 'rgba(140,230,255,0.42)',
    gauntletLaserStrokeColor: 'rgba(255,220,255,0.9)',
    gauntletLaserLineWidthPx: 2,
  };
}

/** ช่องว่างใน path (เช่น Artboard 9.png) — encode เป็น %20 ให้ nginx/เบราว์เซอร์โหลดได้ */
function encodeSpacesInAssetUrlPath(t) {
  const s = String(t || '');
  const q = s.indexOf('?');
  const pathPart = q === -1 ? s : s.slice(0, q);
  const query = q === -1 ? '' : s.slice(q);
  return pathPart.replace(/ /g, '%20') + query;
}

/** รูปเสิร์ฟที่ `/Game/img/...` (alias ไป `public/img`) — อย่าใส่ `/Game/public/img/` จาก path บนดิสก์ */
function normalizeGameAssetUrlForWeb(t) {
  let s = String(t || '');
  s = s.replace(/^\/Game\/public\/img\//i, '/Game/img/');
  s = s.replace(/^Game\/public\/img\//i, 'Game/img/');
  return s;
}

/** ลด %2520 → %20 → space (สูงสุด 2 รอบ) — กันเข้ารหัสซ้ำจากบันทึก/คัดลอก URL */
function decodeAssetUrlPercentRuns(t) {
  let s = String(t || '');
  const q = s.indexOf('?');
  let base = q === -1 ? s : s.slice(0, q);
  const query = q === -1 ? '' : s.slice(q);
  for (let i = 0; i < 2; i += 1) {
    try {
      const d = decodeURIComponent(base);
      if (d === base) break;
      base = d;
    } catch (e) {
      break;
    }
  }
  return base + query;
}

function sanitizeGauntletAssetUrl(s) {
  const t = normalizeGameAssetUrlForWeb(decodeAssetUrlPercentRuns(String(s || '').trim())).replace(/\/+$/, '');
  if (!t || t.length > 500) return '';
  /** ห้ามแท็บ/บรรทัดใหม่/ตัวอักษรอันตราย — อนุญาตช่องว่าง (U+0020) ในชื่อไฟล์ */
  if (/[\t\n\r\x00-\x08\x0b\x0c\x0e-\x1f<>"'`]/.test(t)) return '';
  /** placeholder จาก Admin เช่น /Game/img/....png — ไม่ใช่ path จริง */
  if (/\.{4,}/.test(t)) return '';
  if (/^https?:\/\//i.test(t)) return encodeSpacesInAssetUrlPath(t);
  if (t.startsWith('/')) return encodeSpacesInAssetUrlPath(t);
  /** Admin มักใส่แบบไม่มี slash นำหน้า — ให้เทียบเท่า /Game/... บน nginx */
  if (/^Game\//i.test(t)) return encodeSpacesInAssetUrlPath(`/${t.replace(/^\/+/, '')}`);
  return '';
}

function clampGauntletLaserColor(s, def) {
  const t = String(s || '').trim().slice(0, 100);
  if (!t) return def;
  if (/[<>"'`]/.test(t)) return def;
  return t;
}

function clampGauntletLaserLineWidthPx(n) {
  const v = Number(n);
  if (Number.isNaN(v)) return 2;
  return Math.max(0, Math.min(24, Math.round(v)));
}

function normalizeGauntletVisualsFromRequest(d) {
  const def = defaultGauntletVisuals();
  if (!d || typeof d !== 'object') return { ...def };
  let laneArr = d.gauntletLaneImageUrls;
  if (typeof laneArr === 'string') laneArr = laneArr.split(/[\n\r]+/);
  if (!Array.isArray(laneArr)) laneArr = [];
  const gauntletLaneImageUrls = [];
  for (let i = 0; i < laneArr.length && gauntletLaneImageUrls.length < 24; i++) {
    const u = sanitizeGauntletAssetUrl(laneArr[i]);
    if (u) gauntletLaneImageUrls.push(u);
  }
  return {
    gauntletLaneImageUrls,
    gauntletLaserTopUrl: sanitizeGauntletAssetUrl(d.gauntletLaserTopUrl),
    gauntletLaserBottomUrl: sanitizeGauntletAssetUrl(d.gauntletLaserBottomUrl),
    gauntletLaserLineUrl: sanitizeGauntletAssetUrl(d.gauntletLaserLineUrl),
    gauntletLaserFillColor: clampGauntletLaserColor(d.gauntletLaserFillColor, def.gauntletLaserFillColor),
    gauntletLaserStrokeColor: clampGauntletLaserColor(d.gauntletLaserStrokeColor, def.gauntletLaserStrokeColor),
    gauntletLaserLineWidthPx: clampGauntletLaserLineWidthPx(d.gauntletLaserLineWidthPx),
  };
}

function getGauntletVisualsForClient() {
  const r = runtimeGameTiming;
  const d = defaultGauntletVisuals();
  return {
    gauntletLaneImageUrls: Array.isArray(r.gauntletLaneImageUrls) ? r.gauntletLaneImageUrls : d.gauntletLaneImageUrls,
    gauntletLaserTopUrl: r.gauntletLaserTopUrl || '',
    gauntletLaserBottomUrl: r.gauntletLaserBottomUrl || '',
    gauntletLaserLineUrl: r.gauntletLaserLineUrl || '',
    gauntletLaserFillColor: r.gauntletLaserFillColor != null ? r.gauntletLaserFillColor : d.gauntletLaserFillColor,
    gauntletLaserStrokeColor: r.gauntletLaserStrokeColor != null ? r.gauntletLaserStrokeColor : d.gauntletLaserStrokeColor,
    gauntletLaserLineWidthPx: r.gauntletLaserLineWidthPx != null ? r.gauntletLaserLineWidthPx : d.gauntletLaserLineWidthPx,
  };
}

function loadGameTiming() {
  try {
    if (fs.existsSync(GAME_TIMING_PATH)) {
      const j = JSON.parse(fs.readFileSync(GAME_TIMING_PATH, 'utf8'));
      const vis = normalizeGauntletVisualsFromRequest(j);
      return {
        gauntletTickMs: clampGauntletTickMs(j.gauntletTickMs),
        gauntletJumpTicks: clampGauntletJumpTicks(j.gauntletJumpTicks),
        gauntletTimeLimitSec: clampGauntletTimeLimitSec(j.gauntletTimeLimitSec),
        ...vis,
        stackSwingHz: Object.prototype.hasOwnProperty.call(j, 'stackSwingHz')
          ? clampStackSwingHz(j.stackSwingHz)
          : STACK_SWING_HZ_DEFAULT,
        stackBlockWidthTiles: Object.prototype.hasOwnProperty.call(j, 'stackBlockWidthTiles')
          ? clampStackBlockWidthTiles(j.stackBlockWidthTiles)
          : null,
        stackTowerMissionTimeSec: Object.prototype.hasOwnProperty.call(j, 'stackTowerMissionTimeSec')
          ? clampStackTowerMissionTimeSec(j.stackTowerMissionTimeSec)
          : 90,
        stackTeamMissesMax: Object.prototype.hasOwnProperty.call(j, 'stackTeamMissesMax')
          ? clampStackTeamMissesMax(j.stackTeamMissesMax)
          : 3,
        stackTowerProgressBlocks: Object.prototype.hasOwnProperty.call(j, 'stackTowerProgressBlocks')
          ? clampStackTowerProgressBlocks(j.stackTowerProgressBlocks)
          : 50,
        stackBlockNormalImageUrls: normalizeStackBlockSixImageUrls(j.stackBlockNormalImageUrls),
        stackBlockHeavyImageUrls: normalizeStackBlockSixImageUrls(j.stackBlockHeavyImageUrls),
        stackHeavyBlockPercent: Object.prototype.hasOwnProperty.call(j, 'stackHeavyBlockPercent')
          ? clampStackHeavyBlockPercent(j.stackHeavyBlockPercent)
          : 35,
        jumpSurviveJumpHeightMult: Object.prototype.hasOwnProperty.call(j, 'jumpSurviveJumpHeightMult')
          ? clampJumpSurviveJumpHeightMult(j.jumpSurviveJumpHeightMult)
          : 1.5,
        jumpSurviveMissionTimeSec: Object.prototype.hasOwnProperty.call(j, 'jumpSurviveMissionTimeSec')
          ? clampJumpSurviveMissionTimeSec(j.jumpSurviveMissionTimeSec)
          : 0,
        spaceShooterMissionTimeSec: Object.prototype.hasOwnProperty.call(j, 'spaceShooterMissionTimeSec')
          ? clampSpaceShooterMissionTimeSec(j.spaceShooterMissionTimeSec)
          : 0,
        spaceShooterShipImageUrls: normalizeSpaceShooterShipImageUrls(j.spaceShooterShipImageUrls),
        spaceShooterAsteroidSpriteUrls: normalizeSpaceShooterAsteroidSpriteUrls(j.spaceShooterAsteroidSpriteUrls),
        spaceShooterAsteroidExplodeFrameMs: Object.prototype.hasOwnProperty.call(j, 'spaceShooterAsteroidExplodeFrameMs')
          ? clampSpaceShooterAsteroidExplodeFrameMs(j.spaceShooterAsteroidExplodeFrameMs)
          : 70,
        spaceShooterAsteroidIntervalMs: Object.prototype.hasOwnProperty.call(j, 'spaceShooterAsteroidIntervalMs')
          ? clampSpaceShooterAsteroidIntervalMs(j.spaceShooterAsteroidIntervalMs)
          : SPACE_SHOOTER_ASTEROID_INTERVAL_MS_DEFAULT,
        spaceShooterShipDamageOverlayUrls: normalizeSpaceShooterShipDamageOverlayUrls(j.spaceShooterShipDamageOverlayUrls),
        balloonBossMissionTimeSec: Object.prototype.hasOwnProperty.call(j, 'balloonBossMissionTimeSec')
          ? clampSpaceShooterMissionTimeSec(j.balloonBossMissionTimeSec)
          : 0,
        balloonBossBossImageUrl: Object.prototype.hasOwnProperty.call(j, 'balloonBossBossImageUrl')
          ? sanitizeGauntletAssetUrl(j.balloonBossBossImageUrl)
          : '',
        balloonBossPlayerBalloonImageUrls: normalizeStackBlockSixImageUrls(j.balloonBossPlayerBalloonImageUrls),
        balloonBossPlayerBalloonFallbackUrl: Object.prototype.hasOwnProperty.call(j, 'balloonBossPlayerBalloonFallbackUrl')
          ? sanitizeGauntletAssetUrl(j.balloonBossPlayerBalloonFallbackUrl)
          : '',
      };
    }
  } catch (e) { console.error('loadGameTiming', e.message); }
  return defaultGameTiming();
}

let runtimeGameTiming = loadGameTiming();

function getGauntletTickMs() {
  return runtimeGameTiming.gauntletTickMs;
}

function getGauntletJumpTicks() {
  return runtimeGameTiming.gauntletJumpTicks;
}

function getGauntletTimeLimitSec() {
  return runtimeGameTiming.gauntletTimeLimitSec || 0;
}

function saveGameTimingToFile(d) {
  try {
    const dir = path.dirname(GAME_TIMING_PATH);
    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
    const prev = { ...runtimeGameTiming };
    const vis = normalizeGauntletVisualsFromRequest(d);
    const stackHz = Object.prototype.hasOwnProperty.call(d, 'stackSwingHz')
      ? clampStackSwingHz(d.stackSwingHz)
      : clampStackSwingHz(prev.stackSwingHz != null ? prev.stackSwingHz : STACK_SWING_HZ_DEFAULT);
    const stackBlockW = Object.prototype.hasOwnProperty.call(d, 'stackBlockWidthTiles')
      ? clampStackBlockWidthTiles(d.stackBlockWidthTiles)
      : (Object.prototype.hasOwnProperty.call(prev, 'stackBlockWidthTiles')
        ? prev.stackBlockWidthTiles
        : null);
    const prevMult = Object.prototype.hasOwnProperty.call(prev, 'jumpSurviveJumpHeightMult')
      ? prev.jumpSurviveJumpHeightMult
      : 1.5;
    const jumpMult = Object.prototype.hasOwnProperty.call(d, 'jumpSurviveJumpHeightMult')
      ? clampJumpSurviveJumpHeightMult(d.jumpSurviveJumpHeightMult)
      : clampJumpSurviveJumpHeightMult(prevMult);
    const prevJumpMissionSec = Object.prototype.hasOwnProperty.call(prev, 'jumpSurviveMissionTimeSec')
      ? prev.jumpSurviveMissionTimeSec
      : 0;
    const jumpMissionSec = Object.prototype.hasOwnProperty.call(d, 'jumpSurviveMissionTimeSec')
      ? clampJumpSurviveMissionTimeSec(d.jumpSurviveMissionTimeSec)
      : clampJumpSurviveMissionTimeSec(prevJumpMissionSec);
    const prevSpaceShooterMissionSec = Object.prototype.hasOwnProperty.call(prev, 'spaceShooterMissionTimeSec')
      ? prev.spaceShooterMissionTimeSec
      : 0;
    const spaceShooterMissionSec = Object.prototype.hasOwnProperty.call(d, 'spaceShooterMissionTimeSec')
      ? clampSpaceShooterMissionTimeSec(d.spaceShooterMissionTimeSec)
      : clampSpaceShooterMissionTimeSec(prevSpaceShooterMissionSec);
    const prevShipUrls = Array.isArray(prev.spaceShooterShipImageUrls)
      ? normalizeSpaceShooterShipImageUrls(prev.spaceShooterShipImageUrls)
      : normalizeSpaceShooterShipImageUrls([]);
    const spaceShooterShipImageUrls = Object.prototype.hasOwnProperty.call(d, 'spaceShooterShipImageUrls')
      ? normalizeSpaceShooterShipImageUrls(d.spaceShooterShipImageUrls)
      : prevShipUrls;
    const prevAstUrls = Array.isArray(prev.spaceShooterAsteroidSpriteUrls)
      ? normalizeSpaceShooterAsteroidSpriteUrls(prev.spaceShooterAsteroidSpriteUrls)
      : [];
    const spaceShooterAsteroidSpriteUrls = Object.prototype.hasOwnProperty.call(d, 'spaceShooterAsteroidSpriteUrls')
      ? normalizeSpaceShooterAsteroidSpriteUrls(d.spaceShooterAsteroidSpriteUrls)
      : prevAstUrls;
    const prevAstFms = Object.prototype.hasOwnProperty.call(prev, 'spaceShooterAsteroidExplodeFrameMs')
      ? prev.spaceShooterAsteroidExplodeFrameMs
      : 70;
    const spaceShooterAsteroidExplodeFrameMs = Object.prototype.hasOwnProperty.call(d, 'spaceShooterAsteroidExplodeFrameMs')
      ? clampSpaceShooterAsteroidExplodeFrameMs(d.spaceShooterAsteroidExplodeFrameMs)
      : clampSpaceShooterAsteroidExplodeFrameMs(prevAstFms);
    const prevAstIv = Object.prototype.hasOwnProperty.call(prev, 'spaceShooterAsteroidIntervalMs')
      ? prev.spaceShooterAsteroidIntervalMs
      : SPACE_SHOOTER_ASTEROID_INTERVAL_MS_DEFAULT;
    const spaceShooterAsteroidIntervalMs = Object.prototype.hasOwnProperty.call(d, 'spaceShooterAsteroidIntervalMs')
      ? clampSpaceShooterAsteroidIntervalMs(d.spaceShooterAsteroidIntervalMs)
      : clampSpaceShooterAsteroidIntervalMs(prevAstIv);
    const prevDmg = Array.isArray(prev.spaceShooterShipDamageOverlayUrls)
      ? normalizeSpaceShooterShipDamageOverlayUrls(prev.spaceShooterShipDamageOverlayUrls)
      : normalizeSpaceShooterShipDamageOverlayUrls([]);
    const spaceShooterShipDamageOverlayUrls = Object.prototype.hasOwnProperty.call(d, 'spaceShooterShipDamageOverlayUrls')
      ? normalizeSpaceShooterShipDamageOverlayUrls(d.spaceShooterShipDamageOverlayUrls)
      : prevDmg;
    const prevBbMission = Object.prototype.hasOwnProperty.call(prev, 'balloonBossMissionTimeSec')
      ? prev.balloonBossMissionTimeSec
      : 0;
    const balloonBossMissionTimeSec = Object.prototype.hasOwnProperty.call(d, 'balloonBossMissionTimeSec')
      ? clampSpaceShooterMissionTimeSec(d.balloonBossMissionTimeSec)
      : clampSpaceShooterMissionTimeSec(prevBbMission);
    const prevBbBoss = Object.prototype.hasOwnProperty.call(prev, 'balloonBossBossImageUrl')
      ? sanitizeGauntletAssetUrl(prev.balloonBossBossImageUrl)
      : '';
    const balloonBossBossImageUrl = Object.prototype.hasOwnProperty.call(d, 'balloonBossBossImageUrl')
      ? sanitizeGauntletAssetUrl(d.balloonBossBossImageUrl)
      : prevBbBoss;
    const prevBbBalloons = Array.isArray(prev.balloonBossPlayerBalloonImageUrls)
      ? normalizeStackBlockSixImageUrls(prev.balloonBossPlayerBalloonImageUrls)
      : normalizeStackBlockSixImageUrls([]);
    const balloonBossPlayerBalloonImageUrls = Object.prototype.hasOwnProperty.call(d, 'balloonBossPlayerBalloonImageUrls')
      ? normalizeStackBlockSixImageUrls(d.balloonBossPlayerBalloonImageUrls)
      : prevBbBalloons;
    const prevBbFb = Object.prototype.hasOwnProperty.call(prev, 'balloonBossPlayerBalloonFallbackUrl')
      ? sanitizeGauntletAssetUrl(prev.balloonBossPlayerBalloonFallbackUrl)
      : '';
    const balloonBossPlayerBalloonFallbackUrl = Object.prototype.hasOwnProperty.call(d, 'balloonBossPlayerBalloonFallbackUrl')
      ? sanitizeGauntletAssetUrl(d.balloonBossPlayerBalloonFallbackUrl)
      : prevBbFb;
    const prevStackTowerSec = Object.prototype.hasOwnProperty.call(prev, 'stackTowerMissionTimeSec')
      ? prev.stackTowerMissionTimeSec
      : 90;
    const stackTowerMissionTimeSec = Object.prototype.hasOwnProperty.call(d, 'stackTowerMissionTimeSec')
      ? clampStackTowerMissionTimeSec(d.stackTowerMissionTimeSec)
      : clampStackTowerMissionTimeSec(prevStackTowerSec);
    const prevStackMisses = Object.prototype.hasOwnProperty.call(prev, 'stackTeamMissesMax')
      ? prev.stackTeamMissesMax
      : 3;
    const stackTeamMissesMax = Object.prototype.hasOwnProperty.call(d, 'stackTeamMissesMax')
      ? clampStackTeamMissesMax(d.stackTeamMissesMax)
      : clampStackTeamMissesMax(prevStackMisses);
    const prevStackProgBlocks = Object.prototype.hasOwnProperty.call(prev, 'stackTowerProgressBlocks')
      ? prev.stackTowerProgressBlocks
      : 50;
    const stackTowerProgressBlocks = Object.prototype.hasOwnProperty.call(d, 'stackTowerProgressBlocks')
      ? clampStackTowerProgressBlocks(d.stackTowerProgressBlocks)
      : clampStackTowerProgressBlocks(prevStackProgBlocks);
    const prevStackNorm = Array.isArray(prev.stackBlockNormalImageUrls)
      ? normalizeStackBlockSixImageUrls(prev.stackBlockNormalImageUrls)
      : normalizeStackBlockSixImageUrls([]);
    const prevStackHeavy = Array.isArray(prev.stackBlockHeavyImageUrls)
      ? normalizeStackBlockSixImageUrls(prev.stackBlockHeavyImageUrls)
      : normalizeStackBlockSixImageUrls([]);
    const stackBlockNormalImageUrls = Object.prototype.hasOwnProperty.call(d, 'stackBlockNormalImageUrls')
      ? normalizeStackBlockSixImageUrls(d.stackBlockNormalImageUrls)
      : prevStackNorm;
    const stackBlockHeavyImageUrls = Object.prototype.hasOwnProperty.call(d, 'stackBlockHeavyImageUrls')
      ? normalizeStackBlockSixImageUrls(d.stackBlockHeavyImageUrls)
      : prevStackHeavy;
    const prevHeavyPct = Object.prototype.hasOwnProperty.call(prev, 'stackHeavyBlockPercent')
      ? clampStackHeavyBlockPercent(prev.stackHeavyBlockPercent)
      : 35;
    const stackHeavyBlockPercent = Object.prototype.hasOwnProperty.call(d, 'stackHeavyBlockPercent')
      ? clampStackHeavyBlockPercent(d.stackHeavyBlockPercent)
      : prevHeavyPct;
    const out = {
      gauntletTickMs: clampGauntletTickMs(d.gauntletTickMs),
      gauntletJumpTicks: clampGauntletJumpTicks(d.gauntletJumpTicks),
      gauntletTimeLimitSec: clampGauntletTimeLimitSec(d.gauntletTimeLimitSec),
      ...vis,
      stackSwingHz: stackHz,
      stackBlockWidthTiles: stackBlockW,
      stackTowerMissionTimeSec,
      stackTeamMissesMax,
      stackTowerProgressBlocks,
      stackBlockNormalImageUrls,
      stackBlockHeavyImageUrls,
      stackHeavyBlockPercent,
      jumpSurviveJumpHeightMult: jumpMult,
      jumpSurviveMissionTimeSec: jumpMissionSec,
      spaceShooterMissionTimeSec: spaceShooterMissionSec,
      spaceShooterShipImageUrls,
      spaceShooterAsteroidSpriteUrls,
      spaceShooterAsteroidExplodeFrameMs,
      spaceShooterAsteroidIntervalMs,
      spaceShooterShipDamageOverlayUrls,
      balloonBossMissionTimeSec,
      balloonBossBossImageUrl,
      balloonBossPlayerBalloonImageUrls,
      balloonBossPlayerBalloonFallbackUrl,
    };
    fs.writeFileSync(GAME_TIMING_PATH, JSON.stringify(out, null, 2), 'utf8');
    runtimeGameTiming = out;
    rescheduleAllGauntletTickers();
    return { ok: true, ...out };
  } catch (e) {
    console.error('saveGameTimingToFile', e.message);
    let err = 'บันทึกไม่ได้';
    if (e && e.code === 'EACCES') {
      err = 'ไม่มีสิทธิ์เขียนไฟล์ game-timing.json (ให้ chown เป็น user ที่รันเกม เช่น www-data)';
    } else if (e && e.message) err = 'บันทึกไม่ได้: ' + e.message;
    return { ok: false, error: err };
  }
}

function migrateGauntletAssetsFromLegacyIfNeeded() {
  try {
    if (!fs.existsSync(GAUNTLET_ASSETS_DIR_LEGACY)) return;
    if (!fs.existsSync(GAUNTLET_ASSETS_DIR)) fs.mkdirSync(GAUNTLET_ASSETS_DIR, { recursive: true });
    const names = fs.readdirSync(GAUNTLET_ASSETS_DIR_LEGACY);
    names.forEach((f) => {
      if (!safeGauntletStoredFilename(f)) return;
      const src = path.join(GAUNTLET_ASSETS_DIR_LEGACY, f);
      const dest = path.join(GAUNTLET_ASSETS_DIR, f);
      if (fs.existsSync(dest)) return;
      try {
        fs.copyFileSync(src, dest);
        console.log('[gauntlet-assets] migrated', f, 'from data/ to public/img/gauntlet-assets/');
      } catch (e) {
        console.error('[gauntlet-assets] migrate failed', f, e && e.message);
      }
    });
  } catch (e) {
    console.error('migrateGauntletAssetsFromLegacyIfNeeded', e && e.message);
  }
}

function ensureGauntletAssetsDir() {
  if (!fs.existsSync(GAUNTLET_ASSETS_DIR)) fs.mkdirSync(GAUNTLET_ASSETS_DIR, { recursive: true });
  migrateGauntletAssetsFromLegacyIfNeeded();
}

function loadGauntletAssetsMeta() {
  try {
    if (fs.existsSync(GAUNTLET_ASSETS_META_PATH)) {
      const j = JSON.parse(fs.readFileSync(GAUNTLET_ASSETS_META_PATH, 'utf8'));
      return j && typeof j === 'object' ? j : {};
    }
  } catch (e) { console.error('loadGauntletAssetsMeta', e.message); }
  return {};
}

function saveGauntletAssetsMeta(meta) {
  const dir = path.dirname(GAUNTLET_ASSETS_META_PATH);
  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
  fs.writeFileSync(GAUNTLET_ASSETS_META_PATH, JSON.stringify(meta, null, 2), 'utf8');
}

function safeGauntletStoredFilename(name) {
  const base = path.basename(String(name || ''));
  if (!/^gauntlet-[a-f0-9]{16}\.(png|jpg|jpeg|gif|webp)$/i.test(base)) return null;
  return base;
}

function safeQuizCarryPlaqueStoredFilename(name) {
  const base = path.basename(String(name || ''));
  if (!/^qcarry-[a-f0-9]{16}\.(png|jpg|jpeg|gif|webp)$/i.test(base)) return null;
  return base;
}

function ensureQuizCarryPlaqueAssetsDir() {
  if (!fs.existsSync(QUIZ_CARRY_PLAQUE_ASSETS_DIR)) fs.mkdirSync(QUIZ_CARRY_PLAQUE_ASSETS_DIR, { recursive: true });
}

function gauntletAssetMimeByExt(ext) {
  const e = String(ext || '').toLowerCase();
  if (e === '.png') return 'image/png';
  if (e === '.jpg' || e === '.jpeg') return 'image/jpeg';
  if (e === '.gif') return 'image/gif';
  if (e === '.webp') return 'image/webp';
  return 'application/octet-stream';
}

function listGauntletAssetsApi() {
  ensureGauntletAssetsDir();
  const meta = loadGauntletAssetsMeta();
  let files = [];
  try {
    files = fs.readdirSync(GAUNTLET_ASSETS_DIR);
  } catch (e) {
    return [];
  }
  return files
    .filter((f) => safeGauntletStoredFilename(f))
    .map((f) => {
      const fp = path.join(GAUNTLET_ASSETS_DIR, f);
      let st;
      try {
        st = fs.statSync(fp);
      } catch (e) {
        return null;
      }
      const entry = meta[f];
      const label = entry && typeof entry.label === 'string' ? entry.label.slice(0, 120) : '';
      return {
        filename: f,
        url: BASE_PATH + '/img/gauntlet-assets/' + f,
        label: label || f,
        bytes: st.size,
        mtime: st.mtimeMs,
      };
    })
    .filter(Boolean)
    .sort((a, b) => b.mtime - a.mtime);
}

function saveQuizSettings(d) {
  try {
    const prev = loadQuizSettings();
    const dir = path.dirname(QUIZ_SETTINGS_PATH);
    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
    const readMs = d.readMs != null ? clampQuizMs(d.readMs, prev.readMs) : prev.readMs;
    const answerMs = d.answerMs != null ? clampQuizMs(d.answerMs, prev.answerMs) : prev.answerMs;
    const betweenMs = d.betweenMs != null ? clampQuizBetweenMs(d.betweenMs, prev.betweenMs) : prev.betweenMs;
    const carryReadMs = d.carryReadMs != null ? clampQuizBetweenMs(d.carryReadMs, prev.carryReadMs) : prev.carryReadMs;
    const carryAnswerMs = d.carryAnswerMs != null ? clampQuizMs(d.carryAnswerMs, prev.carryAnswerMs) : prev.carryAnswerMs;
    const carrySessionLength = d.carrySessionLength != null
      ? clampCarrySessionLength(d.carrySessionLength, prev.carrySessionLength)
      : prev.carrySessionLength;
    const questions = Array.isArray(d.questions)
      ? (d.questions || [])
        .filter((q) => q && String(q.text || '').trim())
        .map((q) => ({ text: String(q.text).trim(), answerTrue: !!q.answerTrue }))
      : prev.questions;
    const carryQuestions = Array.isArray(d.carryQuestions)
      ? sanitizeCarryQuestions(d.carryQuestions)
      : prev.carryQuestions;
    const battleQuizMcq = Array.isArray(d.battleQuizMcq)
      ? sanitizeBattleQuizMcq(d.battleQuizMcq)
      : (prev.battleQuizMcq || []);
    const carryMapPanelTheme = d.carryMapPanelTheme != null && typeof d.carryMapPanelTheme === 'object'
      ? sanitizeCarryMapPanelTheme(d.carryMapPanelTheme)
      : prev.carryMapPanelTheme;
    const quizMapPanelTheme = d.quizMapPanelTheme != null && typeof d.quizMapPanelTheme === 'object'
      ? sanitizeCarryMapPanelTheme(d.quizMapPanelTheme)
      : prev.quizMapPanelTheme;
    const carryEmbedCountdownTheme = d.carryEmbedCountdownTheme != null && typeof d.carryEmbedCountdownTheme === 'object'
      ? sanitizeCarryEmbedCountdownTheme(d.carryEmbedCountdownTheme)
      : prev.carryEmbedCountdownTheme;
    let carryChoicePlaqueThemes = prev.carryChoicePlaqueThemes;
    if (Array.isArray(d.carryChoicePlaqueThemes) && d.carryChoicePlaqueThemes.length) {
      carryChoicePlaqueThemes = sanitizeCarryChoicePlaqueThemes(d.carryChoicePlaqueThemes);
    } else if (d.carryChoicePlaqueTheme != null && typeof d.carryChoicePlaqueTheme === 'object') {
      carryChoicePlaqueThemes = sanitizeCarryChoicePlaqueThemes(d.carryChoicePlaqueTheme);
    }
    if (!Array.isArray(carryChoicePlaqueThemes) || !carryChoicePlaqueThemes.length) {
      carryChoicePlaqueThemes = sanitizeCarryChoicePlaqueThemes(prev.carryChoicePlaqueTheme);
    }
    const carryChoicePlaqueTheme = carryChoicePlaqueThemes[0];
    const prevScale = prev.carryChoicePlaqueMapScale != null
      ? clampCarryChoicePlaqueMapScale(prev.carryChoicePlaqueMapScale, 1.25)
      : 1.25;
    const carryChoicePlaqueMapScale = d.carryChoicePlaqueMapScale != null
      ? clampCarryChoicePlaqueMapScale(d.carryChoicePlaqueMapScale, prevScale)
      : prevScale;
    const prevWalkId = sanitizeCarryWalkSpeedMultForMapId(prev.carryWalkSpeedMultForMapId);
    const prevWalkMult = prev.carryWalkSpeedMult != null ? clampCarryWalkSpeedMultSetting(prev.carryWalkSpeedMult) : null;
    let carryWalkSpeedMultForMapId = d.carryWalkSpeedMultForMapId !== undefined
      ? sanitizeCarryWalkSpeedMultForMapId(d.carryWalkSpeedMultForMapId)
      : prevWalkId;
    let carryWalkSpeedMult = d.carryWalkSpeedMult !== undefined ? clampCarryWalkSpeedMultSetting(d.carryWalkSpeedMult) : prevWalkMult;
    if (!carryWalkSpeedMultForMapId) {
      carryWalkSpeedMult = null;
    } else if (carryWalkSpeedMult == null) {
      carryWalkSpeedMult = clampCarryWalkSpeedMultSetting(1.42);
    }
    const quizRoundQuestionCount = d.quizRoundQuestionCount != null
      ? clampQuizRoundQuestionCount(d.quizRoundQuestionCount, prev.quizRoundQuestionCount)
      : prev.quizRoundQuestionCount;
    const out = {
      readMs,
      answerMs,
      betweenMs,
      carryReadMs,
      carryAnswerMs,
      carrySessionLength,
      carryMapPanelTheme,
      quizMapPanelTheme,
      carryEmbedCountdownTheme,
      carryChoicePlaqueThemes,
      carryChoicePlaqueTheme,
      carryChoicePlaqueMapScale,
      carryWalkSpeedMultForMapId,
      carryWalkSpeedMult,
      quizRoundQuestionCount,
      questions,
      carryQuestions,
      battleQuizMcq,
    };
    fs.writeFileSync(QUIZ_SETTINGS_PATH, JSON.stringify(out, null, 2), 'utf8');
    return {
      ok: true,
      battleQuizMcqSaved: (out.battleQuizMcq || []).length,
      carryQuestionsSaved: (out.carryQuestions || []).length,
      carryMapPanelTheme: out.carryMapPanelTheme,
      quizMapPanelTheme: out.quizMapPanelTheme,
      carryEmbedCountdownTheme: out.carryEmbedCountdownTheme,
      carryChoicePlaqueThemes: out.carryChoicePlaqueThemes,
      carryChoicePlaqueTheme: out.carryChoicePlaqueTheme,
      carryChoicePlaqueMapScale: out.carryChoicePlaqueMapScale,
    };
  } catch (e) {
    console.error('saveQuizSettings', e.message);
    let err = 'บันทึกไม่ได้';
    if (e && e.code === 'EACCES') {
      err = 'ไม่มีสิทธิ์เขียนไฟล์ quiz-settings.json (ให้ chown เป็น user ที่รันเกม เช่น www-data)';
    } else if (e && e.message) err = 'บันทึกไม่ได้: ' + e.message;
    return { ok: false, error: err };
  }
}

function getQuizQuestionPool(md) {
  const g = loadQuizSettings();
  const globalQ = (g.questions || []).filter((q) => q && String(q.text || '').trim());
  if (globalQ.length) return globalQ;
  return (md.quizQuestions || []).filter((q) => q && String(q.text || '').trim());
}

function quizCellOn(grid, tx, ty) {
  return !!(grid && grid[ty] && grid[ty][tx] === 1);
}

function getCharacterFootprintWHForMove(md) {
  let cw = Math.floor(Number(md.characterCellsW));
  let ch = Math.floor(Number(md.characterCellsH));
  const hasW = Number.isFinite(cw) && cw >= 1;
  const hasH = Number.isFinite(ch) && ch >= 1;
  if (hasW && hasH) {
    return { cw: Math.max(1, Math.min(4, cw)), ch: Math.max(1, Math.min(4, ch)) };
  }
  const leg = Math.max(1, Math.min(4, Math.floor(Number(md.characterCells)) || 1));
  return { cw: leg, ch: leg };
}

function getCharacterCollisionFootprintWHForMove(md) {
  const { cw, ch } = getCharacterFootprintWHForMove(md);
  let colW = Math.floor(Number(md.characterCollisionW));
  let colH = Math.floor(Number(md.characterCollisionH));
  if (!Number.isFinite(colW) || colW < 1) colW = cw;
  if (!Number.isFinite(colH) || colH < 1) colH = ch;
  colW = Math.max(1, Math.min(cw, colW));
  colH = Math.max(1, Math.min(ch, colH));
  return { cw, ch, colW, colH };
}

function serverWallCollisionTileKeys(md, px, py) {
  const w = md.width || 20;
  const h = md.height || 15;
  const { cw, ch, colW, colH } = getCharacterCollisionFootprintWHForMove(md);
  const minTx = Math.floor(Number(px));
  const minTy = Math.floor(Number(py));
  const offX = minTx + Math.floor((cw - colW) / 2);
  const offY = minTy + (ch - colH);
  const out = [];
  for (let ty = offY; ty < offY + colH; ty++) {
    for (let tx = offX; tx < offX + colW; tx++) {
      if (tx >= 0 && ty >= 0 && tx < w && ty < h) out.push(`${tx},${ty}`);
    }
  }
  return out;
}

function quizCarryFootprintTileKeys(md, px, py) {
  const w = md.width || 20;
  const h = md.height || 15;
  const { cw, ch } = getCharacterFootprintWHForMove(md);
  const minTx = Math.floor(Number(px));
  const minTy = Math.floor(Number(py));
  const maxTx = Math.min(w - 1, minTx + cw - 1);
  const maxTy = Math.min(h - 1, minTy + ch - 1);
  const out = [];
  for (let ty = minTy; ty <= maxTy; ty++) {
    for (let tx = minTx; tx <= maxTx; tx++) {
      if (tx >= 0 && ty >= 0) out.push(`${tx},${ty}`);
    }
  }
  return out;
}

function quizCarryFootprintOverlapsHubServer(md, px, py) {
  if (!md || !md.quizCarryHubArea || md.gameType !== 'quiz_carry') return false;
  for (const k of quizCarryFootprintTileKeys(md, px, py)) {
    const [tx, ty] = k.split(',').map(Number);
    if (quizCellOn(md.quizCarryHubArea, tx, ty)) return true;
  }
  return false;
}

/** Nearest walkable tile center not in true/false answer zones (BFS). */
function findNearestOutsideQuizAnswerZones(md, sx, sy) {
  const w = md.width || 20;
  const h = md.height || 15;
  const tGrid = md.quizTrueArea || [];
  const fGrid = md.quizFalseArea || [];
  const inAnswer = (x, y) => quizCellOn(tGrid, x, y) || quizCellOn(fGrid, x, y);
  const walkable = (x, y) => {
    if (x < 0 || x >= w || y < 0 || y >= h) return false;
    const row = md.objects && md.objects[y];
    return row && row[x] !== 1;
  };
  const fx = Math.floor(Number(sx));
  const fy = Math.floor(Number(sy));
  if (!walkable(fx, fy)) {
    const sp = md.spawn || { x: 1, y: 1 };
    return { x: (typeof sp.x === 'number' ? sp.x : 1) + 0.5, y: (typeof sp.y === 'number' ? sp.y : 1) + 0.5 };
  }
  if (!inAnswer(fx, fy)) return { x: sx, y: sy };
  const q = [[fx, fy]];
  const seen = new Set([`${fx},${fy}`]);
  const dirs = [[0, 1], [0, -1], [1, 0], [-1, 0]];
  while (q.length) {
    const [cx, cy] = q.shift();
    for (let di = 0; di < dirs.length; di++) {
      const nx = cx + dirs[di][0];
      const ny = cy + dirs[di][1];
      const k = `${nx},${ny}`;
      if (seen.has(k)) continue;
      if (!walkable(nx, ny)) continue;
      seen.add(k);
      if (!inAnswer(nx, ny)) {
        return { x: nx + 0.5, y: ny + 0.5 };
      }
      q.push([nx, ny]);
    }
  }
  const sp = md.spawn || { x: 1, y: 1 };
  return { x: (typeof sp.x === 'number' ? sp.x : 1) + 0.5, y: (typeof sp.y === 'number' ? sp.y : 1) + 0.5 };
}

function validateQuizMap(md) {
  const pool = getQuizQuestionPool(md);
  if (pool.length < 1) {
    return 'เพิ่มคำถามใน Admin แท็บ «คำถามเกม» (หรือบันทึกคำถามในฉากแบบเก่าเป็นสำรอง)';
  }
  const w = md.width || 20;
  const h = md.height || 15;
  const tGrid = md.quizTrueArea || [];
  const fGrid = md.quizFalseArea || [];
  let anyT = false;
  let anyF = false;
  for (let y = 0; y < h; y++) {
    for (let x = 0; x < w; x++) {
      if (quizCellOn(tGrid, x, y)) anyT = true;
      if (quizCellOn(fGrid, x, y)) anyF = true;
    }
  }
  if (!anyT || !anyF) return 'วาดโซนคำตอบ ถูก และ ผิด อย่างน้อยช่องละ 1';
  return null;
}

function clearSpaceQuizTimers(space) {
  if (!space.quizTimers || !Array.isArray(space.quizTimers)) {
    space.quizTimers = [];
    return;
  }
  space.quizTimers.forEach((t) => clearTimeout(t));
  space.quizTimers = [];
}

/** เกมถูก/ผิด: คะแนนต่อข้อที่ตอบถูก (ตรงกับ client + เอฟเฟกต์ score+.png) */
const QUIZ_TF_POINTS_PER_CORRECT = 10;

function shuffleQuizQuestions(arr) {
  const a = arr.slice();
  for (let i = a.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [a[i], a[j]] = [a[j], a[i]];
  }
  return a;
}

function endQuizGame(sid, space, message) {
  clearSpaceQuizTimers(space);
  if (space.quizSession) space.quizSession.active = false;
  io.to(sid).emit('quiz-ended', { message: message || 'จบเกม' });
  space.quizSession = null;
}

function emitQuizPlayerStates(sid, space) {
  const sess = space.quizSession;
  if (!sess || !sess.players) return;
  space.peers.forEach((_, peerId) => {
    const st = sess.players[peerId];
    if (st) io.to(peerId).emit('quiz-player-state', { ...st });
  });
}

function scheduleQuizReadPhase(sid, space, md) {
  const sess = space.quizSession;
  if (!sess || !sess.active) return;
  const idx = sess.qIndex;
  const qList = sess.questions;
  if (idx >= qList.length) {
    endQuizGame(sid, space, 'จบเกม — ครบทุกข้อแล้ว');
    return;
  }
  const q = qList[idx];
  const readMs = (Number.isFinite(sess.readMs) && sess.readMs >= 1000) ? sess.readMs : 10000;
  sess.phase = 'read';
  sess.phaseEndsAt = Date.now() + readMs;
  io.to(sid).emit('quiz-phase', {
    phase: 'read',
    questionIndex: idx + 1,
    questionTotal: qList.length,
    text: String(q.text || '').trim(),
    endsAt: sess.phaseEndsAt,
  });
  const t = setTimeout(() => scheduleQuizAnswerPhase(sid, space, md), readMs);
  space.quizTimers.push(t);
}

function scheduleQuizAnswerPhase(sid, space, md) {
  const sess = space.quizSession;
  if (!sess || !sess.active) return;
  const answerMs = (Number.isFinite(sess.answerMs) && sess.answerMs >= 1000) ? sess.answerMs : 5000;
  sess.phase = 'answer';
  sess.phaseEndsAt = Date.now() + answerMs;
  io.to(sid).emit('quiz-phase', {
    phase: 'answer',
    questionIndex: sess.qIndex + 1,
    questionTotal: sess.questions.length,
    endsAt: sess.phaseEndsAt,
  });
  emitQuizPlayerStates(sid, space);
  const t = setTimeout(() => resolveQuizRound(sid, space, md), answerMs);
  space.quizTimers.push(t);
}

function resolveQuizRound(sid, space, md) {
  const sess = space.quizSession;
  if (!sess || !sess.active) return;
  /* ใช้แผนที่ตอนเริ่มเกมเป็นหลัก — กัน getLobbyLayoutMapForSpace คืน lobby/zep แล้ว return ทิ้งทำให้ไม่มีคะแนน/ไม่เตะ */
  const mdLive = sess.quizMapMd || getLobbyLayoutMapForSpace(space) || md;
  if (!mdLive) return;
  const idx = sess.qIndex;
  const q = sess.questions[idx];
  const correctTrue = !!q.answerTrue;
  const tGrid = mdLive.quizTrueArea || [];
  const fGrid = mdLive.quizFalseArea || [];

  let eligibleCount = 0;
  let anyRight = false;
  const results = [];

  const ejectMoves = [];

  space.peers.forEach((p, peerId) => {
    const st = sess.players[peerId];
    if (!st) return;
    eligibleCount++;
    const tx = Math.floor(Number(p.x));
    const ty = Math.floor(Number(p.y));
    const inT = quizCellOn(tGrid, tx, ty);
    const inF = quizCellOn(fGrid, tx, ty);
    let choice = null;
    if (inT && !inF) choice = true;
    else if (inF && !inT) choice = false;
    else if (inT && inF) choice = true;

    let right = false;
    if (choice === null) right = false;
    else right = (choice === correctTrue);

    if (right) {
      st.score = (typeof st.score === 'number' ? st.score : 0) + QUIZ_TF_POINTS_PER_CORRECT;
      anyRight = true;
    }
    /* ผิดทุกกรณี = ล็อกโซนจริงเท็จ + กลับจุดเกิด (สุ่มใน spawnArea ถ้ามี) */
    if (!right) {
      st.cannotTrue = true;
      st.cannotFalse = true;
      const joinOrd = typeof p.spawnJoinOrder === 'number' && Number.isFinite(p.spawnJoinOrder)
        ? Math.max(0, Math.floor(p.spawnJoinOrder))
        : [...space.peers.keys()].indexOf(peerId);
      const pos = quizWrongAnswerRespawnPosition(mdLive, joinOrd);
      p.x = pos.x;
      p.y = pos.y;
      ejectMoves.push({
        id: peerId,
        x: p.x,
        y: p.y,
        direction: p.direction || 'down',
        characterId: p.characterId ?? null,
      });
    }

    results.push({
      id: peerId,
      nickname: p.nickname || '',
      right,
      choice,
      eliminated: !!st.eliminated,
      score: typeof st.score === 'number' ? st.score : 0,
    });
  });

  ejectMoves.forEach((ev) => {
    io.to(sid).emit('user-move', ev);
    try {
      const sock = io.of('/').sockets && io.of('/').sockets.get(ev.id);
      if (sock) sock.emit('user-move', ev);
    } catch (e) { /* ignore */ }
  });

  const allWrong = eligibleCount > 0 && !anyRight;

  const scores = {};
  space.peers.forEach((_, peerId) => {
    const st = sess.players[peerId];
    scores[peerId] = st && typeof st.score === 'number' ? st.score : 0;
  });

  io.to(sid).emit('quiz-result', {
    questionIndex: idx + 1,
    correctTrue,
    results,
    allWrong,
    scores,
  });
  emitQuizPlayerStates(sid, space);

  if (allWrong) {
    endQuizGame(sid, space, 'จบเกม — ทุกคนตอบผิดข้อนี้');
    return;
  }

  sess.qIndex++;
  if (sess.qIndex >= sess.questions.length) {
    endQuizGame(sid, space, 'จบเกม — ครบทุกข้อแล้ว');
    return;
  }

  const betweenMs = (Number.isFinite(sess.betweenMs) && sess.betweenMs >= 0) ? sess.betweenMs : 3500;
  const mapRef = sess.quizMapMd || md;
  const t = setTimeout(() => scheduleQuizReadPhase(sid, space, mapRef), betweenMs);
  space.quizTimers.push(t);
}

function startQuizGame(sid, space, md) {
  clearSpaceQuizTimers(space);
  const settings = loadQuizSettings();
  const pool = getQuizQuestionPool(md);
  const shuffled = shuffleQuizQuestions(pool);
  const cap = clampQuizRoundQuestionCount(settings.quizRoundQuestionCount, 10);
  const picked = shuffled.slice(0, Math.min(cap, shuffled.length));
  const players = {};
  space.peers.forEach((_, peerId) => {
    players[peerId] = { cannotTrue: false, cannotFalse: false, eliminated: false, score: 0 };
  });
  space.quizSession = {
    active: true,
    questions: picked,
    qIndex: 0,
    phase: 'idle',
    phaseEndsAt: 0,
    readMs: settings.readMs,
    answerMs: settings.answerMs,
    betweenMs: settings.betweenMs,
    players,
    quizMapMd: md,
  };
  scheduleQuizReadPhase(sid, space, md);
}

function safeMapId(id) {
  return (id || '').replace(/[^a-z0-9_-]/gi, '') || null;
}

/** กริด hub = 0/1 · option = 0 หรือเลขช่อง 1..QUIZ_CARRY_MAX_OPTION_SLOTS (ห้ามใช้กฎ === 1 กับ option — เลข 2–16หาย) */
function normalizeQuizCarryLayersOnMap(m) {
  if (!m || m.gameType !== 'quiz_carry') return;
  const w = m.width || 20, h = m.height || 15;
  const normHub = () => {
    const src = m.quizCarryHubArea || [];
    const rows = [];
    for (let y = 0; y < h; y++) {
      const r = src[y];
      const row = [];
      for (let x = 0; x < w; x++) row.push(r && r[x] === 1 ? 1 : 0);
      rows.push(row);
    }
    m.quizCarryHubArea = rows;
  };
  const normOptions = () => {
    const src = m.quizCarryOptionArea || [];
    const rows = [];
    for (let y = 0; y < h; y++) {
      const r = src[y];
      const row = [];
      for (let x = 0; x < w; x++) {
        const v = r && r[x];
        const n = typeof v === 'number' ? v : parseInt(String(v), 10);
        row.push(Number.isFinite(n) && n >= 1 && n <= QUIZ_CARRY_MAX_OPTION_SLOTS ? Math.floor(n) : 0);
      }
      rows.push(row);
    }
    m.quizCarryOptionArea = rows;
  };
  const normCountdown = () => {
    const src = m.carryEmbedCountdownArea || [];
    const rows = [];
    for (let y = 0; y < h; y++) {
      const r = src[y];
      const row = [];
      for (let x = 0; x < w; x++) {
        const v = r && r[x];
        row.push(Number(v) === 1 ? 1 : 0);
      }
      rows.push(row);
    }
    m.carryEmbedCountdownArea = rows;
  };
  normHub();
  normOptions();
  normCountdown();
}

/** กริดแพลตฟอร์มกระโดดให้รอด — 0/1 ต่อช่อง */
function normalizeQuizBattleDomeAreaOnMap(m) {
  if (!m || m.gameType !== 'quiz_battle') return;
  const w = m.width || 20, h = m.height || 15;
  const src = m.quizBattleDomeArea || [];
  const rows = [];
  for (let y = 0; y < h; y++) {
    const r = src[y];
    const row = [];
    for (let x = 0; x < w; x++) row.push(r && r[x] === 1 ? 1 : 0);
    rows.push(row);
  }
  m.quizBattleDomeArea = rows;
}

function normalizeQuizBattlePathAreaOnMap(m) {
  if (!m || m.gameType !== 'quiz_battle') return;
  const w = m.width || 20, h = m.height || 15;
  const src = m.quizBattlePathArea || [];
  const rows = [];
  for (let y = 0; y < h; y++) {
    const r = src[y];
    const row = [];
    for (let x = 0; x < w; x++) row.push(r && r[x] === 1 ? 1 : 0);
    rows.push(row);
  }
  m.quizBattlePathArea = rows;
}

function quizBattlePathModeActiveServer(m) {
  if (!m || m.gameType !== 'quiz_battle' || !m.quizBattlePathArea) return false;
  const g = m.quizBattlePathArea;
  for (let y = 0; y < g.length; y++) {
    const row = g[y];
    if (!row) continue;
    for (let x = 0; x < row.length; x++) if (row[x] === 1) return true;
  }
  return false;
}

function quizBattleFootprintFullyOnPathServer(m, px, py) {
  if (!quizBattlePathModeActiveServer(m)) return true;
  const g = m.quizBattlePathArea;
  for (const k of quizCarryFootprintTileKeys(m, px, py)) {
    const [tx, ty] = k.split(',').map(Number);
    if (!g[ty] || g[ty][tx] !== 1) return false;
  }
  return true;
}

function serverFootprintClearOfWalls(md, px, py) {
  const w = md.width || 20, h = md.height || 15;
  for (const k of serverWallCollisionTileKeys(md, px, py)) {
    const [tx, ty] = k.split(',').map(Number);
    if (tx < 0 || tx >= w || ty < 0 || ty >= h) return false;
    const row = md.objects && md.objects[ty];
    if (!row || row[tx] === 1) return false;
  }
  return true;
}

/** จุดใกล้สุดบนเส้นทาง ( footprint อยู่ใน path + ไม่ทับกำแพง ) — ใช้ตอน join / เริ่มเกม */
function snapPositionOntoQuizBattlePathServer(md, px, py) {
  if (!md || md.gameType !== 'quiz_battle' || !quizBattlePathModeActiveServer(md)) return { x: px, y: py };
  if (quizBattleFootprintFullyOnPathServer(md, px, py) && serverFootprintClearOfWalls(md, px, py)) return { x: px, y: py };
  const w = md.width || 20, h = md.height || 15;
  const g = md.quizBattlePathArea;
  let bestX = null, bestY = null, bestD = Infinity;
  for (let ty = 0; ty < h; ty++) {
    for (let tx = 0; tx < w; tx++) {
      if (!g[ty] || g[ty][tx] !== 1) continue;
      const nx = tx + 0.01;
      const ny = ty + 0.01;
      if (!quizBattleFootprintFullyOnPathServer(md, nx, ny)) continue;
      if (!serverFootprintClearOfWalls(md, nx, ny)) continue;
      const d = Math.abs(nx - px) + Math.abs(ny - py);
      if (d < bestD) { bestD = d; bestX = nx; bestY = ny; }
    }
  }
  if (bestX != null) return { x: bestX, y: bestY };
  for (let ty = 0; ty < h; ty++) {
    for (let tx = 0; tx < w; tx++) {
      if (!g[ty] || g[ty][tx] !== 1) continue;
      const row = md.objects && md.objects[ty];
      if (!row || row[tx] === 1) continue;
      const nx = tx + 0.5;
      const ny = ty + 0.5;
      const d = Math.abs(nx - px) + Math.abs(ny - py);
      if (d < bestD) { bestD = d; bestX = nx; bestY = ny; }
    }
  }
  if (bestX != null) return { x: bestX, y: bestY };
  return { x: px, y: py };
}

function normalizeJumpSurvivePlatformAreaOnMap(m) {
  if (!m || m.gameType !== 'jump_survive') return;
  const w = m.width || 20, h = m.height || 15;
  const src = m.jumpSurvivePlatformArea || [];
  const rows = [];
  for (let y = 0; y < h; y++) {
    const r = src[y];
    const row = [];
    for (let x = 0; x < w; x++) row.push(r && r[x] === 1 ? 1 : 0);
    rows.push(row);
  }
  m.jumpSurvivePlatformArea = rows;
}

function loadMaps() {
  try {
    if (!fs.existsSync(path.join(__dirname, 'data'))) fs.mkdirSync(path.join(__dirname, 'data'), { recursive: true });
    if (!fs.existsSync(MAPS_DIR)) fs.mkdirSync(MAPS_DIR, { recursive: true });
    if (!fs.existsSync(CHARACTERS_DIR)) fs.mkdirSync(CHARACTERS_DIR, { recursive: true });
    const files = fs.readdirSync(MAPS_DIR);
    for (const f of files) {
      if (!f.endsWith('.json')) continue;
      const id = f.slice(0, -5);
      if (!safeMapId(id)) continue;
      try {
        const data = JSON.parse(fs.readFileSync(path.join(MAPS_DIR, f), 'utf8'));
        normalizeQuizCarryLayersOnMap(data);
        normalizeJumpSurvivePlatformAreaOnMap(data);
        normalizeQuizBattleDomeAreaOnMap(data);
        normalizeQuizBattlePathAreaOnMap(data);
        maps.set(id, data);
      } catch (e) { console.error('load map', f, e.message); }
    }
  } catch (e) { console.error('loadMaps', e.message); }
}

/** โหลด LobbyB จากไฟล์อีกครั้งถ้ายังไม่อยู่ใน memory (หลังรีสตาร์ท / ไฟล์เพิ่งวาง) */
function ensurePostCaseLobbyMapLoaded() {
  if (maps.has(POST_CASE_LOBBY_SPACE_ID)) return true;
  try {
    const fp = path.join(MAPS_DIR, POST_CASE_LOBBY_SPACE_ID + '.json');
    if (!fs.existsSync(fp)) return false;
    const data = JSON.parse(fs.readFileSync(fp, 'utf8'));
    normalizeQuizCarryLayersOnMap(data);
    maps.set(POST_CASE_LOBBY_SPACE_ID, data);
    return true;
  } catch (e) {
    console.error('ensurePostCaseLobbyMapLoaded', e.message);
    return false;
  }
}

function saveMap(id, m) {
  const safe = safeMapId(id);
  if (!safe) return;
  try {
    if (!fs.existsSync(MAPS_DIR)) fs.mkdirSync(MAPS_DIR, { recursive: true });
    fs.writeFileSync(path.join(MAPS_DIR, safe + '.json'), JSON.stringify(m, null, 0), 'utf8');
  } catch (e) { console.error('saveMap', id, e.message); }
}

function isMapNameTaken(name, excludeId) {
  const n = (name || '').trim().toLowerCase();
  for (const [id, m] of maps) if (id !== excludeId && (m.name || '').trim().toLowerCase() === n) return true;
  return false;
}

const server = http.createServer((req, res) => {
  let url = req.url;
  if (url === BASE_PATH || url === BASE_PATH + '/') url = BASE_PATH + '/index.html';
  if (url.startsWith(BASE_PATH + '/api/maps')) {
    const id = url.replace(BASE_PATH + '/api/maps/', '').replace(BASE_PATH + '/api/maps', '').replace(/^\//, '').split('/')[0];
    if (req.method === 'GET' && id) {
      const m = maps.get(id);
      if (!m) return res.writeHead(404), res.end(JSON.stringify({ error: 'ไม่พบฉาก' }));
      return res.writeHead(200, { 'Content-Type': 'application/json' }), res.end(JSON.stringify(m));
    }
    if (req.method === 'GET' && !id) {
      const list = [...maps].map(([id, m]) => ({ id, name: m.name }));
      return res.writeHead(200, { 'Content-Type': 'application/json' }), res.end(JSON.stringify(list));
    }
    if (req.method === 'POST' && url === BASE_PATH + '/api/maps' || url === BASE_PATH + '/api/maps/') {
      let body = '';
      req.on('data', c => body += c);
      req.on('end', () => {
        try {
          const d = JSON.parse(body);
          const name = (d.name || '').trim() || 'ฉากใหม่';
          if (isMapNameTaken(name)) return res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ชื่อฉากซ้ำ กรุณาตั้งชื่ออื่น' }));
          const id = Date.now().toString(36);
          const m = { ...defaultMap(), ...d, name };
          if (!m.blockPlayer) m.blockPlayer = [];
          if (!m.interactive) m.interactive = [];
          if (!m.startGameArea) m.startGameArea = [];
          if (!m.spawnArea) m.spawnArea = [];
          if (!m.quizTrueArea) m.quizTrueArea = [];
          if (!m.quizFalseArea) m.quizFalseArea = [];
          if (!m.quizQuestionArea) m.quizQuestionArea = [];
          if (!m.quizQuestions) m.quizQuestions = [];
          if (!m.quizCarryHubArea) m.quizCarryHubArea = [];
          if (!m.quizCarryOptionArea) m.quizCarryOptionArea = [];
          if (!m.carryEmbedCountdownArea) m.carryEmbedCountdownArea = [];
          if (!m.quizBattleDomeArea) m.quizBattleDomeArea = [];
          if (!m.quizBattlePathArea) m.quizBattlePathArea = [];
          if (!m.stackReleaseArea) m.stackReleaseArea = [];
          if (!m.stackLandArea) m.stackLandArea = [];
          if (!Array.isArray(m.jumpSurvivePlatforms)) m.jumpSurvivePlatforms = [];
          if (!m.jumpSurvivePlatformArea) m.jumpSurvivePlatformArea = [];
          normalizeQuizCarryLayersOnMap(m);
          normalizeJumpSurvivePlatformAreaOnMap(m);
          normalizeQuizBattleDomeAreaOnMap(m);
          normalizeQuizBattlePathAreaOnMap(m);
          maps.set(id, m);
          saveMap(id, m);
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ ok: true, mapId: id }));
        } catch (e) {
          res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
        }
      });
      return;
    }
    if (req.method === 'PUT' && id && maps.has(id)) {
      let body = '';
      req.on('data', c => body += c);
      req.on('end', () => {
        try {
          const d = JSON.parse(body);
          const name = (d.name || '').trim() || maps.get(id).name;
          if (isMapNameTaken(name, id)) return res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ชื่อฉากซ้ำ กรุณาตั้งชื่ออื่น' }));
          const m = { ...maps.get(id), ...d, name };
          if (!m.blockPlayer) m.blockPlayer = [];
          if (!m.interactive) m.interactive = [];
          if (!m.startGameArea) m.startGameArea = [];
          if (!m.spawnArea) m.spawnArea = [];
          if (!m.quizTrueArea) m.quizTrueArea = [];
          if (!m.quizFalseArea) m.quizFalseArea = [];
          if (!m.quizQuestionArea) m.quizQuestionArea = [];
          if (!m.quizQuestions) m.quizQuestions = [];
          if (!m.quizCarryHubArea) m.quizCarryHubArea = [];
          if (!m.quizCarryOptionArea) m.quizCarryOptionArea = [];
          if (!m.carryEmbedCountdownArea) m.carryEmbedCountdownArea = [];
          if (!m.quizBattleDomeArea) m.quizBattleDomeArea = [];
          if (!m.quizBattlePathArea) m.quizBattlePathArea = [];
          if (!m.stackReleaseArea) m.stackReleaseArea = [];
          if (!m.stackLandArea) m.stackLandArea = [];
          if (!Array.isArray(m.jumpSurvivePlatforms)) m.jumpSurvivePlatforms = [];
          if (!m.jumpSurvivePlatformArea) m.jumpSurvivePlatformArea = [];
          normalizeQuizCarryLayersOnMap(m);
          normalizeJumpSurvivePlatformAreaOnMap(m);
          normalizeQuizBattleDomeAreaOnMap(m);
          normalizeQuizBattlePathAreaOnMap(m);
          maps.set(id, m);
          saveMap(id, m);
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ ok: true, mapId: id }));
        } catch (e) {
          res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
        }
      });
      return;
    }
  }
  const quizCarryDiskUrlPath = url.split('?')[0].replace(/\/+$/, '') || '/';
  const quizCarryDiskPaths = new Set([
    BASE_PATH + '/api/quiz-carry-from-disk',
    BASE_PATH + '/api-quiz-carry-from-disk.php',
  ]);
  if (quizCarryDiskPaths.has(quizCarryDiskUrlPath)) {
    if (req.method === 'GET') {
      const g = loadQuizSettings();
      const slice = {
        carryMapPanelTheme: g.carryMapPanelTheme,
        carryEmbedCountdownTheme: g.carryEmbedCountdownTheme,
        carryChoicePlaqueThemes: g.carryChoicePlaqueThemes,
        carryChoicePlaqueTheme: g.carryChoicePlaqueTheme,
        carryChoicePlaqueMapScale: g.carryChoicePlaqueMapScale,
        carryReadMs: g.carryReadMs,
        carryAnswerMs: g.carryAnswerMs,
        carrySessionLength: g.carrySessionLength,
        carryWalkSpeedMultForMapId: g.carryWalkSpeedMultForMapId,
        carryWalkSpeedMult: g.carryWalkSpeedMult,
        carryQuestions: g.carryQuestions,
      };
      res.writeHead(200, {
        'Content-Type': 'application/json; charset=utf-8',
        'Cache-Control': 'no-store, no-cache, must-revalidate',
        Pragma: 'no-cache',
      });
      return res.end(JSON.stringify(slice));
    }
    res.writeHead(405);
    return res.end(JSON.stringify({ ok: false, error: 'Method not allowed' }));
  }
  const quizSettingsUrlPath = url.split('?')[0].replace(/\/+$/, '') || '/';
  if (quizSettingsUrlPath === BASE_PATH + '/api/quiz-settings') {
    if (req.method === 'GET') {
      res.writeHead(200, {
        'Content-Type': 'application/json; charset=utf-8',
        'Cache-Control': 'no-store, no-cache, must-revalidate',
        Pragma: 'no-cache',
      });
      return res.end(JSON.stringify(loadQuizSettings()));
    }
    if (req.method === 'PUT') {
      let body = '';
      req.on('data', (c) => { body += c; });
      req.on('end', () => {
        res.setHeader('Content-Type', 'application/json; charset=utf-8');
        try {
          const d = JSON.parse(body || '{}');
          const saved = saveQuizSettings(d);
          if (!saved.ok) {
            res.writeHead(500);
            return res.end(JSON.stringify({ ok: false, error: saved.error || 'บันทึกไม่ได้' }));
          }
          res.writeHead(200);
          return res.end(JSON.stringify({
            ok: true,
            battleQuizMcqSaved: saved.battleQuizMcqSaved,
            carryQuestionsSaved: saved.carryQuestionsSaved,
            carryMapPanelTheme: saved.carryMapPanelTheme,
            carryEmbedCountdownTheme: saved.carryEmbedCountdownTheme,
            carryChoicePlaqueThemes: saved.carryChoicePlaqueThemes,
            carryChoicePlaqueTheme: saved.carryChoicePlaqueTheme,
            carryChoicePlaqueMapScale: saved.carryChoicePlaqueMapScale,
          }));
        } catch (e) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
        }
      });
      return;
    }
    res.writeHead(405);
    return res.end(JSON.stringify({ ok: false, error: 'Method not allowed' }));
  }
  const gameTimingUrlPath = url.split('?')[0].replace(/\/+$/, '') || '/';
  if (gameTimingUrlPath === BASE_PATH + '/api/game-timing') {
    if (req.method === 'GET') {
      res.writeHead(200, {
        'Content-Type': 'application/json; charset=utf-8',
        'Cache-Control': 'no-store, no-cache, must-revalidate',
        'Pragma': 'no-cache',
      });
      return res.end(JSON.stringify({ ...runtimeGameTiming }));
    }
    if (req.method === 'PUT') {
      let body = '';
      req.on('data', (c) => { body += c; });
      req.on('end', () => {
        res.setHeader('Content-Type', 'application/json; charset=utf-8');
        res.setHeader('Cache-Control', 'no-store');
        try {
          const d = JSON.parse(body || '{}');
          const saved = saveGameTimingToFile(d);
          if (!saved.ok) {
            res.writeHead(500);
            return res.end(JSON.stringify({ ok: false, error: saved.error || 'บันทึกไม่ได้' }));
          }
          res.writeHead(200);
          const { ok: _ok, error: _err, ...timingRest } = saved;
          return res.end(JSON.stringify({ ok: true, ...timingRest }));
        } catch (e) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
        }
      });
      return;
    }
    res.writeHead(405);
    return res.end(JSON.stringify({ ok: false, error: 'Method not allowed' }));
  }
  const gaAssetsApiPath = url.split('?')[0].replace(/\/+$/, '') || '/';
  if (gaAssetsApiPath === BASE_PATH + '/api/gauntlet-assets' && req.method === 'GET') {
    res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });
    return res.end(JSON.stringify({ ok: true, items: listGauntletAssetsApi() }));
  }
  if (gaAssetsApiPath === BASE_PATH + '/api/gauntlet-assets/upload' && req.method === 'POST') {
    let body = '';
    req.on('data', (c) => { body += c; });
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json; charset=utf-8');
      try {
        const d = JSON.parse(body || '{}');
        const dataUrl = d.imageDataUrl;
        if (!dataUrl || typeof dataUrl !== 'string') {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ต้องส่ง imageDataUrl (data URL รูป)' }));
        }
        const m = dataUrl.match(/^data:image\/(png|jpeg|jpg|gif|webp);base64,([\s\S]+)$/i);
        if (!m) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'รองรับเฉพาะ png / jpg / gif / webp' }));
        }
        const extRaw = m[1].toLowerCase();
        const ext = extRaw === 'jpeg' ? 'jpg' : extRaw;
        const b64 = m[2].replace(/\s/g, '');
        let buf;
        try {
          buf = Buffer.from(b64, 'base64');
        } catch (e) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'base64 ไม่ถูกต้อง' }));
        }
        if (buf.length < 16 || buf.length > 4 * 1024 * 1024) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ขนาดไฟล์ต้องอยู่ระหว่าง 16 ไบต์ ถึง 4 MB' }));
        }
        ensureGauntletAssetsDir();
        const labelIn = d.label != null ? String(d.label).trim().slice(0, 120) : '';
        const replaceFilename = d.replaceFilename != null ? String(d.replaceFilename) : '';
        let fname;
        if (replaceFilename) {
          const s = safeGauntletStoredFilename(replaceFilename);
          if (!s) {
            res.writeHead(400);
            return res.end(JSON.stringify({ ok: false, error: 'ชื่อไฟล์แทนที่ไม่ถูกต้อง' }));
          }
          const cur = path.join(GAUNTLET_ASSETS_DIR, s);
          if (!fs.existsSync(cur)) {
            res.writeHead(404);
            return res.end(JSON.stringify({ ok: false, error: 'ไม่พบไฟล์เดิม' }));
          }
          const norm = (e) => {
            let x = String(e || '').toLowerCase();
            if (x.startsWith('.')) x = x.slice(1);
            return x === 'jpeg' ? 'jpg' : x;
          };
          if (norm(path.extname(s)) !== norm(ext)) {
            res.writeHead(400);
            return res.end(JSON.stringify({ ok: false, error: 'นามสกุลรูปใหม่ต้องตรงกับไฟล์เดิม' }));
          }
          fname = s;
        } else {
          fname = `gauntlet-${crypto.randomBytes(8).toString('hex')}.${ext}`;
        }
        fs.writeFileSync(path.join(GAUNTLET_ASSETS_DIR, fname), buf);
        const meta = loadGauntletAssetsMeta();
        const prev = meta[fname] || {};
        meta[fname] = {
          ...prev,
          label: labelIn || prev.label || fname,
          updatedAt: Date.now(),
        };
        saveGauntletAssetsMeta(meta);
        res.writeHead(200);
        return res.end(JSON.stringify({
          ok: true,
          filename: fname,
          url: BASE_PATH + '/img/gauntlet-assets/' + fname,
        }));
      } catch (e) {
        res.writeHead(400);
        return res.end(JSON.stringify({ ok: false, error: 'อัปโหลดไม่สำเร็จ: ' + (e.message || '') }));
      }
    });
    return;
  }
  const qCarryPlaqueUploadPath = url.split('?')[0].replace(/\/+$/, '') || '/';
  if (qCarryPlaqueUploadPath === BASE_PATH + '/api/quiz-carry-plaque-upload' && req.method === 'POST') {
    let body = '';
    req.on('data', (c) => { body += c; });
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json; charset=utf-8');
      try {
        const d = JSON.parse(body || '{}');
        const dataUrl = d.imageDataUrl;
        if (!dataUrl || typeof dataUrl !== 'string') {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ต้องส่ง imageDataUrl (data URL รูป)' }));
        }
        const m = dataUrl.match(/^data:image\/(png|jpeg|jpg|gif|webp);base64,([\s\S]+)$/i);
        if (!m) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'รองรับเฉพาะ png / jpg / gif / webp' }));
        }
        const extRaw = m[1].toLowerCase();
        const ext = extRaw === 'jpeg' ? 'jpg' : extRaw;
        const b64 = m[2].replace(/\s/g, '');
        let buf;
        try {
          buf = Buffer.from(b64, 'base64');
        } catch (e) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'base64 ไม่ถูกต้อง' }));
        }
        if (buf.length < 16 || buf.length > 4 * 1024 * 1024) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'ขนาดไฟล์ต้องอยู่ระหว่าง 16 ไบต์ ถึง 4 MB' }));
        }
        ensureQuizCarryPlaqueAssetsDir();
        const fname = `qcarry-${crypto.randomBytes(8).toString('hex')}.${ext}`;
        fs.writeFileSync(path.join(QUIZ_CARRY_PLAQUE_ASSETS_DIR, fname), buf);
        res.writeHead(200);
        return res.end(JSON.stringify({
          ok: true,
          filename: fname,
          url: BASE_PATH + '/img/quiz-carry-plaque-assets/' + fname,
        }));
      } catch (e) {
        res.writeHead(400);
        return res.end(JSON.stringify({ ok: false, error: 'อัปโหลดไม่สำเร็จ: ' + (e.message || '') }));
      }
    });
    return;
  }
  if (gaAssetsApiPath === BASE_PATH + '/api/gauntlet-assets' && req.method === 'PATCH') {
    let body = '';
    req.on('data', (c) => { body += c; });
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json; charset=utf-8');
      try {
        const d = JSON.parse(body || '{}');
        const fname = safeGauntletStoredFilename(d.filename);
        if (!fname) {
          res.writeHead(400);
          return res.end(JSON.stringify({ ok: false, error: 'filename ไม่ถูกต้อง' }));
        }
        const fp = path.join(GAUNTLET_ASSETS_DIR, fname);
        if (!fs.existsSync(fp)) {
          res.writeHead(404);
          return res.end(JSON.stringify({ ok: false, error: 'ไม่พบไฟล์' }));
        }
        const meta = loadGauntletAssetsMeta();
        const label = d.label != null ? String(d.label).trim().slice(0, 120) : '';
        meta[fname] = { ...(meta[fname] || {}), label: label || fname, updatedAt: Date.now() };
        saveGauntletAssetsMeta(meta);
        res.writeHead(200);
        return res.end(JSON.stringify({ ok: true, filename: fname, label: meta[fname].label }));
      } catch (e) {
        res.writeHead(400);
        return res.end(JSON.stringify({ ok: false, error: e.message || 'บันทึกไม่ได้' }));
      }
    });
    return;
  }
  if (gaAssetsApiPath === BASE_PATH + '/api/gauntlet-assets' && req.method === 'DELETE') {
    try {
      const q = url.includes('?') ? url.split('?')[1] : '';
      const sp = new URLSearchParams(q);
      const rawFn = sp.get('file');
      const fname = safeGauntletStoredFilename(rawFn);
      if (!fname) {
        res.writeHead(400, { 'Content-Type': 'application/json; charset=utf-8' });
        return res.end(JSON.stringify({ ok: false, error: 'ระบุ file ไม่ถูกต้อง' }));
      }
      const fp = path.join(GAUNTLET_ASSETS_DIR, fname);
      if (fs.existsSync(fp)) fs.unlinkSync(fp);
      const meta = loadGauntletAssetsMeta();
      delete meta[fname];
      saveGauntletAssetsMeta(meta);
      res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });
      return res.end(JSON.stringify({ ok: true }));
    } catch (e) {
      res.writeHead(500, { 'Content-Type': 'application/json; charset=utf-8' });
      return res.end(JSON.stringify({ ok: false, error: 'ลบไม่สำเร็จ' }));
    }
  }
  if (url === BASE_PATH + '/api/characters' && req.method === 'GET') {
    try {
      if (!fs.existsSync(CHARACTERS_DIR)) fs.mkdirSync(CHARACTERS_DIR, { recursive: true });
      const files = fs.readdirSync(CHARACTERS_DIR);
      const ids = new Set();
      const ext = /\.(png|jpg|jpeg|gif|webp)$/i;
      files.forEach(f => {
        let m = f.match(/^(.+)_(up|down|left|right)(?:_\d+)?\.(png|jpg|jpeg|gif|webp)$/i);
        if (m) ids.add(m[1]);
        m = f.match(/^(.+)_(up|down|left|right)(?:_\d+)?_layer_[a-zA-Z]+\.(png|jpg|jpeg|gif|webp)$/i);
        if (m) ids.add(m[1]);
        m = f.match(/^(.+)_(up|down|left|right)_idle(?:_\d+)?_layer_[a-zA-Z]+\.(png|jpg|jpeg|gif|webp)$/i);
        if (m) ids.add(m[1]);
        m = f.match(/^(.+)_(up|down|left|right)_idle(?:_\d+)?\.(png|jpg|jpeg|gif|webp)$/i);
        if (m) ids.add(m[1]);
      });
      const idArr = [...ids];
      const oldestMsById = {};
      idArr.forEach((id) => {
        let oldest = Infinity;
        const prefix = id + '_';
        files.forEach((f) => {
          if (!f.startsWith(prefix) || !ext.test(f)) return;
          try {
            const st = fs.statSync(path.join(CHARACTERS_DIR, f));
            const t = st.mtimeMs != null ? st.mtimeMs : st.mtime.getTime();
            if (t < oldest) oldest = t;
          } catch (e) { /* ignore */ }
        });
        oldestMsById[id] = oldest === Infinity ? 0 : oldest;
      });
      idArr.sort((a, b) => {
        const ta = oldestMsById[a] || 0;
        const tb = oldestMsById[b] || 0;
        if (ta !== tb) return ta - tb;
        return String(a).localeCompare(String(b));
      });
      const list = idArr.map((id) => {
        const prefix = id + '_';
        const hasLayerFiles = files.some((f) => f.startsWith(prefix) && f.includes('_layer_') && ext.test(f));
        const layerNameSet = new Set();
        if (hasLayerFiles) {
          files.forEach((f) => {
            if (!f.startsWith(prefix) || !ext.test(f)) return;
            let m = f.match(/_(?:up|down|left|right)_idle(?:_\d+)?_layer_([a-zA-Z]+)\.[^.]+$/i);
            if (m) {
              layerNameSet.add(m[1]);
              return;
            }
            m = f.match(/_(?:up|down|left|right)(?:_\d+)?_layer_([a-zA-Z]+)\.[^.]+$/i);
            if (m) layerNameSet.add(m[1]);
          });
        }
        const layers = layerNameSet.size ? [...layerNameSet].sort() : [];
        const layerManifest = hasLayerFiles ? buildCharacterLayerManifest(id, files) : null;
        return { id, name: id, hasLayerFiles, layers, layerManifest };
      });
      res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });
      return res.end(JSON.stringify(list));
    } catch (e) {
      res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });
      return res.end(JSON.stringify([]));
    }
  }
  const urlPath = url.split('?')[0];
  {
    const lm = urlPath.match(new RegExp('^' + String(BASE_PATH).replace(/\//g, '\\/') + '\\/api\\/characters\\/([^/]+)\\/layer-manifest$'));
    if (lm && req.method === 'GET') {
      const id = decodeURIComponent(lm[1] || '').replace(/[^a-z0-9_-]/gi, '');
      if (!id) {
        res.writeHead(400, { 'Content-Type': 'application/json; charset=utf-8' });
        return res.end(JSON.stringify({ ok: false, error: 'id ไม่ถูกต้อง', byDir: {}, byDirIdle: {} }));
      }
      try {
        if (!fs.existsSync(CHARACTERS_DIR)) fs.mkdirSync(CHARACTERS_DIR, { recursive: true });
        const files = fs.readdirSync(CHARACTERS_DIR);
        const manifest = buildCharacterLayerManifest(id, files);
        res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });
        return res.end(JSON.stringify(manifest));
      } catch (e) {
        res.writeHead(500, { 'Content-Type': 'application/json; charset=utf-8' });
        return res.end(JSON.stringify({ ok: false, error: e.message || 'manifest fail', byDir: {}, byDirIdle: {} }));
      }
    }
  }
  if (urlPath.startsWith(BASE_PATH + '/api/characters/') && req.method === 'DELETE') {
    if (/\/layer-manifest$/i.test(urlPath)) {
      res.writeHead(405, { 'Content-Type': 'application/json; charset=utf-8' });
      return res.end(JSON.stringify({ ok: false, error: 'ใช้ GET เท่านั้น' }));
    }
    const idRaw = decodeURIComponent(urlPath.slice((BASE_PATH + '/api/characters/').length));
    const id = (idRaw || '').replace(/[^a-z0-9_-]/gi, '');
    if (!id) {
      res.writeHead(400, { 'Content-Type': 'application/json' });
      return res.end(JSON.stringify({ ok: false, error: 'id ไม่ถูกต้อง' }));
    }
    try {
      if (!fs.existsSync(CHARACTERS_DIR)) fs.mkdirSync(CHARACTERS_DIR, { recursive: true });
      const files = fs.readdirSync(CHARACTERS_DIR);
      const esc = id.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
      const re = new RegExp('^' + esc + '_(up|down|left|right)(?:_\\d+)?\\.(png|jpg|jpeg|gif|webp)$', 'i');
      const idleRe = new RegExp('^' + esc + '_(up|down|left|right)_idle(?:_\\d+)?\\.(png|jpg|jpeg|gif|webp)$', 'i');
      const layerRe = new RegExp('^' + esc + '_(up|down|left|right)(?:_\\d+)?_layer_[a-zA-Z]+\\.(png|jpg|jpeg|gif|webp)$', 'i');
      const layerIdleRe = new RegExp('^' + esc + '_(up|down|left|right)_idle(?:_\\d+)?_layer_[a-zA-Z]+\\.(png|jpg|jpeg|gif|webp)$', 'i');
      let removed = 0;
      files.forEach(f => {
        if (re.test(f) || idleRe.test(f) || layerRe.test(f) || layerIdleRe.test(f)) {
          try {
            fs.unlinkSync(path.join(CHARACTERS_DIR, f));
            removed++;
          } catch (e) {
            // ignore single file errors
          }
        }
      });
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify({ ok: true, removed }));
    } catch (e) {
      res.writeHead(500, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify({ ok: false, error: 'ลบไม่สำเร็จ: ' + (e.message || '') }));
    }
    return;
  }
  if (urlPath === BASE_PATH + '/api/characters/upload' && req.method === 'POST') {
    let body = '';
    req.on('data', c => body += c);
    req.on('end', () => {
      try {
        if (!body || body.length < 2) {
          res.writeHead(400, { 'Content-Type': 'application/json' });
          return res.end(JSON.stringify({ ok: false, error: 'ไม่มีข้อมูล (เลือกรูปแล้วกดอัปโหลด)' }));
        }
        const d = JSON.parse(body);
        const dirs = ['up', 'down', 'left', 'right'];
        const id = (d.name || '').trim().replace(/[^a-z0-9_-]/gi, '') || 'char-' + Date.now();
        if (!fs.existsSync(CHARACTERS_DIR)) fs.mkdirSync(CHARACTERS_DIR, { recursive: true });
        const ALLOWED_LAYER = { shadow: 1, bodyColor: 1, bodyStroke: 1, headColor: 1, headStroke: 1, hairColor: 1, hairStroke: 1, face: 1 };
        let walkWritten = 0;
        for (const dir of dirs) {
          let data = d[dir];
          if (!data) continue;
          const list = Array.isArray(data) ? data : [data];
          let frameIndex = 0;
          for (const dataUrl of list) {
            if (!dataUrl || typeof dataUrl !== 'string') continue;
            const m = dataUrl.match(/^data:image\/[\w+]+;base64,([\s\S]+)$/);
            if (!m) continue;
            const b64 = m[1].replace(/\s/g, '');
            if (!b64.length) continue;
            let buf;
            try {
              buf = Buffer.from(b64, 'base64');
            } catch (err) {
              continue;
            }
            if (buf.length === 0) continue;
            // เขียนไฟล์เฟรม (สำหรับ animation)
            const fnameFrame = list.length > 1 ? (id + '_' + dir + '_' + frameIndex + '.png') : (id + '_' + dir + '.png');
            fs.writeFileSync(path.join(CHARACTERS_DIR, fnameFrame), buf);
            // ถ้ามีหลายเฟรม ให้เฟรมแรกซ้ำไปเป็นไฟล์หลัก <id>_<dir>.png เพื่อใช้เป็น preview / fallback
            if (list.length > 1 && frameIndex === 0) {
              const baseName = id + '_' + dir + '.png';
              fs.writeFileSync(path.join(CHARACTERS_DIR, baseName), buf);
            }
            walkWritten++;
            frameIndex++;
          }
        }
        let layerWritten = 0;
        // ไฟล์เลเยอร์แยก (ให้หน้า play ย้อม bodyColor / hairColor / headColor ตามส่วน — ตรงกับ character.html)
        const lf = d.layerFrames;
        if (lf && typeof lf === 'object') {
          for (const dir of dirs) {
            const arr = lf[dir];
            if (!Array.isArray(arr)) continue;
            const multi = arr.length > 1;
            arr.forEach((frameObj, frameIndex) => {
              if (!frameObj || typeof frameObj !== 'object') return;
              for (const layerName of Object.keys(frameObj)) {
                if (!ALLOWED_LAYER[layerName]) continue;
                const dataUrl = frameObj[layerName];
                if (!dataUrl || typeof dataUrl !== 'string') continue;
                const m = dataUrl.match(/^data:image\/[\w+]+;base64,([\s\S]+)$/);
                if (!m) continue;
                const b64 = m[1].replace(/\s/g, '');
                if (!b64.length) continue;
                let buf;
                try {
                  buf = Buffer.from(b64, 'base64');
                } catch (err) {
                  continue;
                }
                if (buf.length === 0) continue;
                const fnameLayer = multi
                  ? (id + '_' + dir + '_' + frameIndex + '_layer_' + layerName + '.png')
                  : (id + '_' + dir + '_layer_' + layerName + '.png');
                fs.writeFileSync(path.join(CHARACTERS_DIR, fnameLayer), buf);
                layerWritten++;
              }
            });
          }
        }
        const lfIdle = d.layerFramesIdle;
        if (lfIdle && typeof lfIdle === 'object') {
          for (const dir of dirs) {
            const arr = lfIdle[dir];
            if (!Array.isArray(arr)) continue;
            const multi = arr.length > 1;
            arr.forEach((frameObj, frameIndex) => {
              if (!frameObj || typeof frameObj !== 'object') return;
              for (const layerName of Object.keys(frameObj)) {
                if (!ALLOWED_LAYER[layerName]) continue;
                const dataUrl = frameObj[layerName];
                if (!dataUrl || typeof dataUrl !== 'string') continue;
                const m = dataUrl.match(/^data:image\/[\w+]+;base64,([\s\S]+)$/);
                if (!m) continue;
                const b64 = m[1].replace(/\s/g, '');
                if (!b64.length) continue;
                let buf;
                try {
                  buf = Buffer.from(b64, 'base64');
                } catch (err) {
                  continue;
                }
                if (buf.length === 0) continue;
                const fnameLayer = multi
                  ? (id + '_' + dir + '_idle_' + frameIndex + '_layer_' + layerName + '.png')
                  : (id + '_' + dir + '_idle_layer_' + layerName + '.png');
                fs.writeFileSync(path.join(CHARACTERS_DIR, fnameLayer), buf);
                layerWritten++;
              }
            });
          }
        }
        const idleObj = d.idle && typeof d.idle === 'object' ? d.idle : null;
        if (idleObj) {
          for (const dir of dirs) {
            let data = idleObj[dir];
            if (!data) continue;
            const list = Array.isArray(data) ? data : [data];
            let frameIndex = 0;
            for (const dataUrl of list) {
              if (!dataUrl || typeof dataUrl !== 'string') continue;
              const m = dataUrl.match(/^data:image\/[\w+]+;base64,([\s\S]+)$/);
              if (!m) continue;
              const b64 = m[1].replace(/\s/g, '');
              if (!b64.length) continue;
              let buf;
              try {
                buf = Buffer.from(b64, 'base64');
              } catch (err) {
                continue;
              }
              if (buf.length === 0) continue;
              const fnameFrame = list.length > 1
                ? (id + '_' + dir + '_idle_' + frameIndex + '.png')
                : (id + '_' + dir + '_idle.png');
              fs.writeFileSync(path.join(CHARACTERS_DIR, fnameFrame), buf);
              if (list.length > 1 && frameIndex === 0) {
                const baseName = id + '_' + dir + '_idle.png';
                fs.writeFileSync(path.join(CHARACTERS_DIR, baseName), buf);
              }
              frameIndex++;
            }
          }
        }
        if (walkWritten === 0 && layerWritten === 0) {
          res.writeHead(400, { 'Content-Type': 'application/json' });
          return res.end(JSON.stringify({ ok: false, error: 'ไม่มีรูปที่อัปโหลดได้ (ต้องมีรูปเดินหรือเลเยอร์อย่างน้อยหนึ่งทิศ)' }));
        }
        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify({ ok: true, characterId: id }));
      } catch (e) {
        res.writeHead(400, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify({ ok: false, error: 'อัปโหลดไม่สำเร็จ: ' + (e.message || '') }));
      }
    });
    return;
  }
  if (url.startsWith(BASE_PATH + '/api/spaces')) {
    const parts = url.slice((BASE_PATH + '/api/spaces').length).split('/').filter(Boolean);
    const spaceId = parts[0];
    if (req.method === 'GET' && !spaceId) {
      const now = Date.now();
      for (const [id, s] of [...spaces.entries()]) {
        if (s.isPrivate || id === POST_CASE_LOBBY_SPACE_ID) continue;
        const n = s.peers ? s.peers.size : 0;
        if (n !== 0) continue;
        const created = s.createdAt;
        const stale = created == null || now - created > SPACE_EMPTY_TTL_MS;
        if (stale) spaces.delete(id);
      }
      const list = [...spaces]
        .filter(([, s]) => !s.isPrivate)
        .filter(([, s]) => (s.peers && s.peers.size > 0))
        .map(([id, s]) => ({
          spaceId: id,
          spaceName: s.spaceName || id,
          mapName: (s.mapData && s.mapData.name) || '—',
          peerCount: s.peers ? s.peers.size : 0,
          maxPlayers: s.maxPlayers || 10
        }));
      return res.writeHead(200, { 'Content-Type': 'application/json' }), res.end(JSON.stringify(list));
    }
    if (req.method === 'GET' && spaceId) {
      const s = spaces.get(spaceId);
      if (!s) return res.writeHead(404), res.end(JSON.stringify({ error: 'ไม่พบห้อง' }));
      return res.writeHead(200, { 'Content-Type': 'application/json' }), res.end(JSON.stringify({ ok: true, mapName: s.mapData?.name }));
    }
    if (req.method === 'POST' && !spaceId) {
      let body = '';
      req.on('data', c => body += c);
      req.on('end', () => {
        try {
          const d = JSON.parse(body || '{}');
          const mapData = d.mapId ? maps.get(d.mapId) : null;
          if (!mapData) return res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ไม่พบฉาก' }));
          const isPrivate = !!d.isPrivate;
          let sid;
          if (isPrivate) {
            const chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
            let code;
            for (let i = 0; i < 20; i++) {
              code = '';
              for (let j = 0; j < 6; j++) code += chars[Math.floor(Math.random() * chars.length)];
              if (!spaces.has(code)) { sid = code; break; }
            }
            if (!sid) sid = 'priv-' + Date.now();
          } else {
            const base = (d.name || '').trim() || 'space';
            sid = base + '-' + Date.now();
          }
          const spaceName = (d.name || '').trim() || (isPrivate ? 'ห้องส่วนตัว' : sid);
          let maxPlayers = parseInt(d.maxPlayers, 10);
          if (isNaN(maxPlayers) || maxPlayers < 1) maxPlayers = 10;
          maxPlayers = Math.min(10, Math.max(1, maxPlayers));
          if (mapData.gameType === 'gauntlet' || mapData.gameType === 'space_shooter' || mapData.gameType === 'balloon_boss') maxPlayers = Math.min(maxPlayers, 6);
          const mapId = d.mapId ? String(d.mapId).trim() : null;
          const previewEditorTest = isPrivate && String(spaceName).toLowerCase() === 'preview';
          spaces.set(sid, {
            mapData, mapId, peers: new Map(), spaceName, hostId: null, isPrivate, maxPlayers, createdAt: Date.now(),
            previewEditorTest,
          });
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ ok: true, spaceId: sid, roomCode: isPrivate ? sid : null }));
        } catch (e) {
          res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
        }
      });
      return;
    }
  }
  if (url === BASE_PATH + '/api/ice-servers' && req.method === 'GET') {
    function sendIceServers(iceServers) {
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify({ iceServers: iceServers || [] }));
    }
    function fallback() {
      const iceServers = [{ urls: 'stun:stun.l.google.com:19302' }, { urls: 'stun:stun1.l.google.com:19302' }];
      const turnUrl = process.env.TURN_SERVER || process.env.TURN_URL;
      const turnUser = process.env.TURN_USER;
      const turnCred = process.env.TURN_CRED;
      if (turnUrl && turnUser && turnCred) iceServers.push({ urls: turnUrl, username: turnUser, credential: turnCred });
      sendIceServers(iceServers);
    }
    const meteredKey = process.env.METERED_TURN_API_KEY || process.env.METERED_TURN_SECRET_KEY;
    const meteredAppId = process.env.METERED_TURN_APP_ID;
    let meteredBase = process.env.METERED_TURN_URL;
    if (!meteredBase) {
      let meteredHost = process.env.METERED_TURN_SUBDOMAIN || 'openrelayprojectsecret';
      if (meteredHost.indexOf('metered.live') === -1) meteredHost = meteredHost + '.metered.live';
      meteredBase = 'https://' + meteredHost;
    }
    meteredBase = meteredBase.replace(/\/$/, '');
    if (meteredKey) {
      function tryNext(credUrl) {
        return fetch(credUrl).then(function (r) { return r.json(); }).then(function (data) {
          if (data && (data.error || data.message)) throw new Error(data.error || data.message);
          const list = Array.isArray(data) ? data : (data && data.iceServers);
          if (list && list.length) return sendIceServers(list);
          if (data && data.data && Array.isArray(data.data) && data.data.length) {
            const turnHost = process.env.METERED_TURN_HOST || 'global.relay.metered.ca';
            const built = data.data.map(function (c) {
              return { urls: 'turn:' + turnHost + ':443', username: c.username, credential: c.password };
            });
            return sendIceServers(built);
          }
          throw new Error('No iceServers');
        });
      }
      const urlsToTry = [
        meteredBase + '/api/v1/turn/credentials?apiKey=' + encodeURIComponent(meteredKey),
        meteredBase + '/api/v1/turn/credentials?apiKey=' + encodeURIComponent(meteredAppId || meteredKey),
        meteredBase + '/api/v2/turn/credentials?secretKey=' + encodeURIComponent(meteredKey)
      ];
      let p = tryNext(urlsToTry[0]);
      for (let i = 1; i < urlsToTry.length; i++) {
        p = p.catch(function () { return tryNext(urlsToTry[i]); });
      }
      p.catch(fallback);
      return;
    }
    const iceServers = [{ urls: 'stun:stun.l.google.com:19302' }, { urls: 'stun:stun1.l.google.com:19302' }];
    const turnUrl = process.env.TURN_SERVER || process.env.TURN_URL;
    const turnUser = process.env.TURN_USER;
    const turnCred = process.env.TURN_CRED;
    if (turnUrl && turnUser && turnCred) iceServers.push({ urls: turnUrl, username: turnUser, credential: turnCred });
    sendIceServers(iceServers);
    return;
  }
  if (url === BASE_PATH + '/api/ai-admin-login' && req.method === 'POST') {
    let body = '';
    req.on('data', c => body += c);
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json');
      try {
        const d = JSON.parse(body || '{}');
        const password = (d.password || '').trim();
        if (password !== ADMIN_PASSWORD) {
          return res.writeHead(401), res.end(JSON.stringify({ ok: false, error: 'รหัสผ่านไม่ถูกต้อง' }));
        }
        const token = require('crypto').randomBytes(24).toString('hex');
        adminTokens.add(token);
        res.setHeader('Set-Cookie', 'game_ai_admin=' + token + '; Path=' + BASE_PATH + '; HttpOnly; Max-Age=86400; SameSite=Lax');
        res.writeHead(200);
        res.end(JSON.stringify({ ok: true }));
      } catch (e) {
        res.writeHead(400), res.end(JSON.stringify({ ok: false, error: 'ข้อมูลไม่ถูกต้อง' }));
      }
    });
    return;
  }
  if (url === BASE_PATH + '/api/ai-settings' && req.method === 'GET') {
    const token = getAdminToken(req.headers.cookie);
    if (!token) return res.writeHead(401), res.end(JSON.stringify({ error: 'ต้องล็อกอินก่อน' }));
    const s = loadAiSettings();
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({
      model: s.model || 'gpt-4o-mini',
      models: AI_MODELS,
      hasKey: !!(s.openai_api_key && s.openai_api_key.length > 0),
      intent: s.intent != null ? s.intent : '',
      rag_enabled: !!s.rag_enabled,
      rag_context: s.rag_context != null ? s.rag_context : '',
    }));
    return;
  }
  if (url === BASE_PATH + '/api/ai-settings' && req.method === 'PUT') {
    const token = getAdminToken(req.headers.cookie);
    if (!token) return res.writeHead(401), res.end(JSON.stringify({ error: 'ต้องล็อกอินก่อน' }));
    let body = '';
    req.on('data', c => body += c);
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json');
      try {
        const d = JSON.parse(body || '{}');
        const s = loadAiSettings();
        if (d.openai_api_key !== undefined) s.openai_api_key = String(d.openai_api_key).trim();
        if (d.model !== undefined) s.model = String(d.model).trim() || 'gpt-4o-mini';
        if (d.intent !== undefined) s.intent = String(d.intent);
        if (d.rag_enabled !== undefined) s.rag_enabled = !!d.rag_enabled;
        if (d.rag_context !== undefined) s.rag_context = String(d.rag_context);
        saveAiSettings(s);
        res.writeHead(200);
        res.end(JSON.stringify({ ok: true }));
      } catch (e) {
        res.writeHead(400), res.end(JSON.stringify({ ok: false, error: e.message }));
      }
    });
    return;
  }
  if (url === BASE_PATH + '/api/ai-chat' && req.method === 'POST') {
    let body = '';
    req.on('data', c => body += c);
    req.on('end', () => {
      res.setHeader('Content-Type', 'application/json; charset=utf-8');
      try {
        const d = JSON.parse(body || '{}');
        const message = (d.message || d.text || '').trim();
        if (!message) return res.writeHead(400), res.end(JSON.stringify({ error: 'ไม่มีข้อความ' }));
        const s = loadAiSettings();
        if (!s.openai_api_key) return res.writeHead(503), res.end(JSON.stringify({ error: 'ยังไม่ได้ตั้งค่า OpenAI API Key ในหน้า Admin' }));
        const model = s.model || 'gpt-4o-mini';
        const messages = [];
        const systemParts = [];
        if (s.intent && String(s.intent).trim()) systemParts.push(String(s.intent).trim());
        if (s.rag_enabled && s.rag_context && String(s.rag_context).trim()) {
          systemParts.push('ความรู้/บริบทเพิ่มเติม (ใช้ประกอบการตอบ):\n' + String(s.rag_context).trim());
        }
        if (systemParts.length) messages.push({ role: 'system', content: systemParts.join('\n\n') });
        messages.push({ role: 'user', content: message });
        const payload = JSON.stringify({
          model: model,
          messages: messages,
          max_tokens: 500,
        });
        const urlObj = new URL('https://api.openai.com/v1/chat/completions');
        const opts = {
          hostname: urlObj.hostname,
          path: urlObj.pathname,
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer ' + s.openai_api_key,
            'Content-Length': Buffer.byteLength(payload, 'utf8'),
          },
        };
        const reqOut = require('https').request(opts, (resOut) => {
          let data = '';
          resOut.on('data', chunk => data += chunk);
          resOut.on('end', () => {
            try {
              const parsed = JSON.parse(data);
              const text = parsed.choices && parsed.choices[0] && parsed.choices[0].message && parsed.choices[0].message.content;
              if (text != null) {
                res.writeHead(200);
                res.end(JSON.stringify({ response: String(text).trim() }));
              } else {
                res.writeHead(502);
                res.end(JSON.stringify({ error: parsed.error && parsed.error.message ? parsed.error.message : 'OpenAI error' }));
              }
            } catch (e) {
              res.writeHead(502), res.end(JSON.stringify({ error: 'Invalid response from OpenAI' }));
            }
          });
        });
        reqOut.on('error', (e) => { res.writeHead(502), res.end(JSON.stringify({ error: e.message })); });
        reqOut.write(payload);
        reqOut.end();
      } catch (e) {
        res.writeHead(400), res.end(JSON.stringify({ error: e.message }));
      }
    });
    return;
  }
  if (url.startsWith(BASE_PATH + '/img/characters/') && req.method === 'GET') {
    const sub = url.slice((BASE_PATH + '/img/characters/').length).split('?')[0];
    const fname = path.basename(sub).replace(/[^a-z0-9_.-]/gi, '');
    if (fname && fname.length > 0) {
      const fp = path.join(CHARACTERS_DIR, fname);
      if (fs.existsSync(fp)) {
        return fs.readFile(fp, (err, data) => {
          if (err) return res.writeHead(500), res.end();
          res.writeHead(200, { 'Content-Type': 'image/png' });
          res.end(data);
        });
      }
    }
  }
  if (url.startsWith(BASE_PATH + '/img/gauntlet-assets/') && req.method === 'GET') {
    const sub = decodeURIComponent(url.slice((BASE_PATH + '/img/gauntlet-assets/').length).split('?')[0]);
    const fname = safeGauntletStoredFilename(sub);
    if (!fname) {
      res.writeHead(400);
      return res.end();
    }
    const fp = path.join(GAUNTLET_ASSETS_DIR, fname);
    if (!fs.existsSync(fp)) {
      res.writeHead(404);
      return res.end();
    }
    const ext = path.extname(fname);
    return fs.readFile(fp, (err, data) => {
      if (err) return res.writeHead(500), res.end();
      res.writeHead(200, { 'Content-Type': gauntletAssetMimeByExt(ext) });
      res.end(data);
    });
  }
  if (url.indexOf(BASE_PATH) === 0) url = url.slice(BASE_PATH.length) || '/index.html';
  const filePath = path.join(__dirname, 'public', url);
  const ext = path.extname(filePath);
  const types = { '.html': 'text/html', '.js': 'application/javascript', '.css': 'text/css' };
  fs.readFile(filePath, (err, data) => {
    if (err) return res.writeHead(404), res.end('Not Found');
    res.writeHead(200, { 'Content-Type': types[ext] || 'application/octet-stream' });
    res.end(data);
  });
});

const io = new Server(server, { path: BASE_PATH + '/socket.io', cors: { origin: '*' } });
const spaces = new Map();

const GAUNTLET_MAX_PLAYERS = 6;
/** ระยะอยู่กลางอากาศ (tick) — ปรับได้ที่ Admin / data/game-timing.json */
/** สุ่มเป็นคอลัมน์เลเซอร์ (ทุกแถว) ต่อหนึ่งรอบเกิด */
const GAUNTLET_LASER_SPAWN_CHANCE = 0.14;
/** เฉพาะแถวที่มีผู้เล่น — แถวละโอกาสเกิด lane obstacle */
const GAUNTLET_LANE_ROW_SPAWN_CHANCE = 0.34;
/** Last Light / museum gauntlet — scoring, mission UI, how-to flow */
const GAUNTLET_CROWN_HEIST_MAP_ID = 'mno9kb07';

function isGauntletCrownHeistMapBySpace(space) {
  return !!(space && space.mapId && String(space.mapId) === GAUNTLET_CROWN_HEIST_MAP_ID);
}

function rollGauntletCrownRewardCard(grade) {
  const r = Math.random();
  if (grade === 'A') {
    if (r < 0.3) return { kind: 'culprit', th: 'การ์ดชี้คนร้าย', en: 'Culprit card' };
    if (r < 0.8) return { kind: 'rare', th: 'การ์ด Rare', en: 'Rare card' };
    return { kind: 'common', th: 'การ์ดธรรมดา', en: 'Common card' };
  }
  if (grade === 'B') {
    if (r < 0.2) return { kind: 'culprit', th: 'การ์ดชี้คนร้าย', en: 'Culprit card' };
    if (r < 0.5) return { kind: 'rare', th: 'การ์ด Rare', en: 'Rare card' };
    return { kind: 'common', th: 'การ์ดธรรมดา', en: 'Common card' };
  }
  if (r < 0.2) return { kind: 'rare', th: 'การ์ด Rare', en: 'Rare card' };
  return { kind: 'common', th: 'การ์ดธรรมดา', en: 'Common card' };
}

function gauntletCrownRankBonus(rankOrdinal) {
  if (rankOrdinal === 1) return 100;
  if (rankOrdinal === 2) return 80;
  if (rankOrdinal === 3) return 60;
  return 0;
}

function buildGauntletCrownMissionPayload(space) {
  const peersArr = [...space.peers.values()];
  const rows = peersArr.map((p) => ({
    id: p.id,
    nickname: (p.nickname || '').trim() || 'ผู้เล่น',
    characterId: p.characterId ?? null,
    baseScore: p.gauntletEliminated ? 0 : Math.max(0, p.gauntletScore | 0),
    eliminated: !!p.gauntletEliminated,
  }));
  rows.sort((a, b) => {
    if (b.baseScore !== a.baseScore) return b.baseScore - a.baseScore;
    return String(a.nickname).localeCompare(String(b.nickname), 'th');
  });
  let lastScore = null;
  let rankOrdinal = 0;
  const ranked = [];
  for (let i = 0; i < rows.length; i++) {
    const pos = i + 1;
    if (lastScore !== rows[i].baseScore) {
      rankOrdinal = pos;
      lastScore = rows[i].baseScore;
    }
    const bonus = gauntletCrownRankBonus(rankOrdinal);
    const finalScore = rows[i].baseScore + bonus;
    const rankLabel = rankOrdinal === 1 ? '1st' : rankOrdinal === 2 ? '2nd' : rankOrdinal === 3 ? '3rd' : String(rankOrdinal);
    ranked.push({
      id: rows[i].id,
      nickname: rows[i].nickname,
      characterId: rows[i].characterId,
      baseScore: rows[i].baseScore,
      eliminated: rows[i].eliminated,
      rank: rankOrdinal,
      rankLabel,
      rankBonus: bonus,
      finalScore,
    });
  }
  const totalSum = ranked.reduce((s, r) => s + r.finalScore, 0);
  const n = ranked.length || 1;
  const averageScore = Math.floor(totalSum / n);
  const grade = averageScore >= 80 ? 'A' : averageScore >= 60 ? 'B' : 'C';
  const rewardCard = rollGauntletCrownRewardCard(grade);
  return {
    ranked,
    totalSum,
    averageScore,
    grade,
    rewardCard,
    totalParts: ranked.map((r) => r.finalScore),
  };
}

function gauntletSpawnYs(md, playerCount) {
  const h = md.height || 15;
  const lo = 1;
  const hi = Math.max(lo, h - 2);
  const n = Math.min(GAUNTLET_MAX_PLAYERS, Math.max(1, playerCount));
  if (hi <= lo) return Array.from({ length: n }, () => lo);
  const ys = [];
  for (let i = 0; i < n; i++) {
    ys.push(Math.round(lo + (i * (hi - lo)) / Math.max(1, n - 1)));
  }
  return ys;
}

/** ช่อง spawnArea=1 ที่เดินได้ เรียงจากบนลงล่าง — ใช้เมื่อไม่มี gauntletPlayerSpawns */
function collectGauntletSpawnSlotsFromSpawnArea(md) {
  const grid = md.spawnArea;
  if (!grid || !Array.isArray(grid)) return [];
  const w = md.width || 20;
  const h = md.height || 15;
  const slots = [];
  for (let y = 0; y < h; y++) {
    const row = grid[y];
    if (!row) continue;
    for (let x = 0; x < w; x++) {
      if (Number(row[x]) === 1 && isMapTileWalkableForSpawn(md, x, y)) slots.push({ x, y });
    }
  }
  slots.sort((a, b) => a.y - b.y || a.x - b.x);
  return slots;
}

/** ลำดับผู้เล่น 1..6: ใช้ gauntletPlayerSpawns ตามลำดับใน JSON ก่อน ถ้าไม่มี/ว่างค่อยใช้ spawnArea */
function collectGauntletSpawnSlotsFromMap(md) {
  const explicit = md.gauntletPlayerSpawns;
  if (Array.isArray(explicit) && explicit.length > 0) {
    const w = md.width || 20;
    const h = md.height || 15;
    const slots = [];
    for (const raw of explicit) {
      if (slots.length >= GAUNTLET_MAX_PLAYERS) break;
      const x = Math.floor(Number(raw && raw.x));
      const y = Math.floor(Number(raw && raw.y));
      if (!Number.isFinite(x) || !Number.isFinite(y) || x < 0 || x >= w || y < 0 || y >= h) continue;
      if (!isMapTileWalkableForSpawn(md, x, y)) continue;
      slots.push({ x, y });
    }
    if (slots.length > 0) return slots;
  }
  return collectGauntletSpawnSlotsFromSpawnArea(md);
}

function gauntletResolveSpawnXForRow(md, spawnColX, y, slotXFallback) {
  const w = md.width || 20;
  if (isMapTileWalkableForSpawn(md, spawnColX, y)) return spawnColX;
  if (slotXFallback != null && isMapTileWalkableForSpawn(md, slotXFallback, y)) return slotXFallback;
  for (let d = 0; d < w; d++) {
    if (spawnColX + d < w && isMapTileWalkableForSpawn(md, spawnColX + d, y)) return spawnColX + d;
    if (spawnColX - d >= 0 && isMapTileWalkableForSpawn(md, spawnColX - d, y)) return spawnColX - d;
  }
  return Math.max(0, Math.min(w - 1, spawnColX));
}

/** แนว Y ตามลำดับจุดเกิด แต่ทุกคนใช้คอลัมน์ x เดียวกัน (ซ้ายสุดจากชุดจุดที่กำหนด) — กันยืนเฉียง */
function gauntletSpawnPositions(md, playerCount) {
  const n = Math.min(GAUNTLET_MAX_PLAYERS, Math.max(1, playerCount));
  const slots = collectGauntletSpawnSlotsFromMap(md);
  const fallbackYs = gauntletSpawnYs(md, n);
  const spawnColX = slots.length ? Math.min(...slots.map((s) => s.x)) : 1;
  const out = [];
  for (let i = 0; i < n; i++) {
    const y = i < slots.length
      ? slots[i].y
      : (fallbackYs[i] != null ? fallbackYs[i] : fallbackYs[fallbackYs.length - 1]);
    const slotX = i < slots.length ? slots[i].x : null;
    const x = gauntletResolveSpawnXForRow(md, spawnColX, y, slotX);
    out.push({ x, y });
  }
  return out;
}

function stopGauntletTicker(space) {
  if (space.gauntletRun && space.gauntletRun.timerId) {
    clearInterval(space.gauntletRun.timerId);
    space.gauntletRun.timerId = null;
  }
}

/** ถ้าตั้งจำกัดเวลาใน Admin แต่ยังไม่มี endsAt (เช่น join ห้อง Gauntlet โดยตรง) — เริ่มนับตอนนี้ */
function ensureGauntletEndsAtIfNeeded(space) {
  const gr = space.gauntletRun;
  if (!gr) return;
  if (gr.crownRunHeld) return;
  const lim = getGauntletTimeLimitSec();
  if (lim > 0 && gr.endsAt == null) {
    gr.endsAt = Date.now() + lim * 1000;
  }
}

function newGauntletRunState(space) {
  const crown = !!(space && isGauntletCrownHeistMapBySpace(space));
  return {
    obstacles: [],
    nextObsId: 1,
    spawnAcc: 0,
    nextSpawnIn: 3,
    crownRunHeld: crown,
  };
}

function emitGauntletSync(sid, space) {
  const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
  if (!md || md.gameType !== 'gauntlet') return;
  const gr = space.gauntletRun;
  if (!gr) return;
  const h = md.height || 15;
  const obsOut = gr.obstacles.map((o) => {
    if (o.kind === 'laser') {
      const y0 = o.y0 != null && Number.isFinite(Number(o.y0)) ? Math.floor(Number(o.y0)) : 0;
      const y1 = o.y1 != null && Number.isFinite(Number(o.y1)) ? Math.floor(Number(o.y1)) : h - 1;
      return { id: o.id, kind: 'laser', x: o.x, y: null, y0, y1 };
    }
    return { id: o.id, kind: o.kind, x: o.x, y: o.y };
  });
  const playersOut = [...space.peers.values()].map((p) => ({
    id: p.id,
    x: p.x,
    y: p.y,
    direction: p.direction || 'down',
    characterId: p.characterId ?? null,
    gauntletJumpTicks: p.gauntletJumpTicks || 0,
    gauntletScore: p.gauntletScore || 0,
    gauntletEliminated: !!p.gauntletEliminated,
  }));
  io.to(sid).emit('gauntlet-sync', {
    obstacles: obsOut,
    players: playersOut,
    gauntletTickMs: getGauntletTickMs(),
    gauntletJumpTicks: getGauntletJumpTicks(),
    gauntletTimeLimitSec: getGauntletTimeLimitSec(),
    gauntletEndsAt: gr.endsAt != null ? gr.endsAt : null,
    gauntletCrownRunHeld: !!gr.crownRunHeld,
    ...getGauntletVisualsForClient(),
  });
}

function startGauntletTicker(sid, space) {
  const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
  if (!md || md.gameType !== 'gauntlet') return;
  if (space.gauntletRun && space.gauntletRun.timerId) return;
  if (!space.gauntletRun) {
    space.gauntletRun = newGauntletRunState(space);
  }
  ensureGauntletEndsAtIfNeeded(space);
  space.gauntletRun.timerId = setInterval(() => {
    runGauntletTick(sid, space);
  }, getGauntletTickMs());
}

function initGauntletPeersAll(space, md) {
  const list = [...space.peers.values()];
  const pos = gauntletSpawnPositions(md, list.length);
  const crown = isGauntletCrownHeistMapBySpace(space);
  list.forEach((p, i) => {
    const pt = pos[i] || pos[pos.length - 1];
    p.x = pt.x;
    p.y = pt.y;
    p.gauntletJumpTicks = 0;
    p.gauntletScore = crown ? 100 : 0;
    p.gauntletJumpPending = false;
    p.gauntletEliminated = false;
  });
  space.gauntletRun = newGauntletRunState(space);
  if (crown) {
    if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
    space.peers.forEach((_p, id) => {
      space.gauntletCrownLobbyReady[id] = false;
    });
  }
  space.gauntletPreviewRowsBySocket = new Map();
}

function findFallbackLobbyMapForGauntletEnd() {
  for (const [id, m] of maps) {
    if (m && m.gameType === 'lobby') return { id, m };
  }
  return null;
}

/** หมดเวลา Gauntlet — หยุด tick, คืนแผนที่ lobby, แจ้งไคลเอนต์ */
function endGauntletGame(sid, space, reason) {
  const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
  if (!md || md.gameType !== 'gauntlet') return;
  stopGauntletTicker(space);
  const wasCrown = isGauntletCrownHeistMapBySpace(space);
  const crownMission = wasCrown ? buildGauntletCrownMissionPayload(space) : null;
  const rankings = crownMission
    ? crownMission.ranked.map((r) => ({
      id: r.id,
      nickname: r.nickname,
      score: r.finalScore,
    }))
    : [...space.peers.values()].map((p) => ({
      id: p.id,
      nickname: (p.nickname || '').trim() || 'ผู้เล่น',
      score: Math.max(0, p.gauntletScore | 0),
    })).sort((a, b) => b.score - a.score);

  let retId = space.gauntletReturnMapId;
  let retMap = retId && maps.has(retId) ? maps.get(retId) : null;
  if (!retMap || retMap.gameType === 'gauntlet') {
    const fb = findFallbackLobbyMapForGauntletEnd();
    if (fb) {
      retId = fb.id;
      retMap = fb.m;
    }
  }
  if (retMap && retMap.gameType !== 'gauntlet') {
    space.mapId = retId;
    space.mapData = retMap;
    let gi = 0;
    space.peers.forEach((p) => {
      const sp = pickSpawnForJoin(retMap, gi++);
      p.x = sp.x;
      p.y = sp.y;
      p.gauntletJumpTicks = 0;
      p.gauntletScore = 0;
      p.gauntletJumpPending = false;
      p.gauntletEliminated = false;
    });
  } else {
    console.warn('endGauntletGame: no lobby map to return to', sid);
  }
  space.gauntletReturnMapId = null;
  if (space.gauntletPreviewRowsBySocket) space.gauntletPreviewRowsBySocket.clear();
  space.gauntletRun = null;
  const msg = reason === 'time' ? 'หมดเวลา — เกมพรมแดงจบแล้ว' : 'เกมพรมแดงจบแล้ว';
  io.to(sid).emit('gauntlet-ended', {
    reason: reason || 'time',
    message: msg,
    rankings,
    crownMission: crownMission || undefined,
  });
}

/** แถว y บน–ล่างของเลเซอร์จากแมป (null ทั้งคู่ = เต็มความสูง) */
function gauntletLaserVerticalSpanFromMap(md) {
  const hRaw = md && md.height != null ? Number(md.height) : 15;
  const h = Math.max(1, Math.floor(Number.isFinite(hRaw) ? hRaw : 15));
  const rs = md && md.gauntletLaserRowStart;
  const re = md && md.gauntletLaserRowEnd;
  if (rs == null || re == null || !Number.isFinite(Number(rs)) || !Number.isFinite(Number(re))) {
    return { y0: 0, y1: h - 1 };
  }
  let y0 = Math.floor(Number(rs));
  let y1 = Math.floor(Number(re));
  y0 = Math.max(0, Math.min(h - 1, y0));
  y1 = Math.max(0, Math.min(h - 1, y1));
  if (y1 < y0) {
    const t = y0;
    y0 = y1;
    y1 = t;
  }
  return { y0, y1 };
}

/**
 * แถว grid ของ lane obstacle: แถวเท้า (ขอบล่าง footprint; แถวบนของตัว = player y)
 * — สูงกว่าแบบ top+ch หนึ่งช่อง (ไม่ให้ลงเกินพรม)
 */
function gauntletLaneGridRowFromPlayerTop(md, topY, h) {
  const { ch } = getCharacterFootprintWHForMove(md);
  const top = Math.floor(Number(topY));
  if (!Number.isFinite(top) || top < 0 || top >= h) return null;
  const lr = top + ch - 1;
  if (lr < 0 || lr >= h) return null;
  return lr;
}

function runGauntletTick(sid, space) {
  const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
  if (!md || md.gameType !== 'gauntlet') {
    stopGauntletTicker(space);
    return;
  }
  const w = md.width || 20;
  const h = md.height || 15;
  const gr = space.gauntletRun;
  if (!gr) return;
  ensureGauntletEndsAtIfNeeded(space);
  if (gr.endsAt != null && Date.now() >= gr.endsAt) {
    endGauntletGame(sid, space, 'time');
    return;
  }

  if (gr.crownRunHeld) {
    space.peers.forEach((p) => {
      p.gauntletJumpPending = false;
    });
    emitGauntletSync(sid, space);
    return;
  }

  /* ใช้ pending ให้ jump กับ collision อยู่รอบ tick เดียวกัน (กัน race ระหว่าง setInterval กับ socket) */
  space.peers.forEach((p) => {
    if (p.gauntletJumpPending) {
      if ((p.gauntletJumpTicks || 0) === 0) {
        p.gauntletJumpTicks = getGauntletJumpTicks();
      }
      p.gauntletJumpPending = false;
    }
  });

  for (let i = 0; i < gr.obstacles.length; i++) gr.obstacles[i].x -= 1;
  gr.obstacles = gr.obstacles.filter((o) => o.x >= 0);

  const laneSpawnRows = new Set();
  space.peers.forEach((peer) => {
    const lr = gauntletLaneGridRowFromPlayerTop(md, peer.y, h);
    if (lr != null) laneSpawnRows.add(lr);
  });
  /* แถวบนที่ client แจ้ง (บอท preview) — แปลงเป็นแถว lane เดียวกับ peer */
  const previewRows = space.gauntletPreviewRowsBySocket;
  if (previewRows && previewRows.size) {
    previewRows.forEach((set) => {
      set.forEach((y) => {
        const lr = gauntletLaneGridRowFromPlayerTop(md, y, h);
        if (lr != null) laneSpawnRows.add(lr);
      });
    });
  }
  /* lane obstacle เฉพาะแถวที่ยังมีผู้เล่น/บอทในเลนนั้น — ลบชิ้นที่ไม่มีใครแล้ว */
  gr.obstacles = gr.obstacles.filter((o) => o.kind !== 'lane' || laneSpawnRows.has(o.y));

  gr.spawnAcc = (gr.spawnAcc || 0) + 1;
  if (gr.spawnAcc >= (gr.nextSpawnIn || 3)) {
    gr.spawnAcc = 0;
    gr.nextSpawnIn = 2 + Math.floor(Math.random() * 6);
    /* ประเภท 2: เลเซอร์ — ทุกแถว */
    if (Math.random() < GAUNTLET_LASER_SPAWN_CHANCE) {
      const span = gauntletLaserVerticalSpanFromMap(md);
      gr.obstacles.push({ id: ++gr.nextObsId, kind: 'laser', x: w - 1, y0: span.y0, y1: span.y1 });
    }
    /* ประเภท 1: แยกเลน — แถวเท้า (ไม่ใช่แถวหัว; ไม่ใช่แถวใต้เท้าอีกช่อง) */
    laneSpawnRows.forEach((ly) => {
      if (Math.random() < GAUNTLET_LANE_ROW_SPAWN_CHANCE) {
        gr.obstacles.push({ id: ++gr.nextObsId, kind: 'lane', x: w - 1, y: ly });
      }
    });
  }

  /* กระโดดข้ามสำเร็จ → เลื่อนผู้เล่นไปขวา แต่ไม่ลบ obstacle (ยังไหลต่อให้คนอื่น/รอบถัดไป) */
  const crownHeist = isGauntletCrownHeistMapBySpace(space);
  const { ch: gauntletCh } = getCharacterFootprintWHForMove(md);
  space.peers.forEach((p) => {
    if (crownHeist && p.gauntletEliminated) {
      return;
    }
    let px = Math.floor(Number(p.x)) || 0;
    let py = Math.floor(Number(p.y)) || 0;
    px = Math.max(0, Math.min(w - 1, px));
    py = Math.max(0, Math.min(h - 1, py));
    const air = (p.gauntletJumpTicks || 0) > 0;
    let advanceX = false;
    let hitBack = false;
    for (const o of gr.obstacles) {
      if (o.kind === 'lane' && o.x === px && o.y >= py && o.y < py + gauntletCh) {
        if (air) advanceX = true;
        else hitBack = true;
      }
      if (o.kind === 'laser' && o.x === px) {
        const y0 = o.y0 != null && Number.isFinite(Number(o.y0)) ? Math.max(0, Math.min(h - 1, Math.floor(Number(o.y0)))) : 0;
        const y1 = o.y1 != null && Number.isFinite(Number(o.y1)) ? Math.max(0, Math.min(h - 1, Math.floor(Number(o.y1)))) : h - 1;
        const lo = Math.min(y0, y1);
        const hi = Math.max(y0, y1);
        if (py < lo || py > hi) {
          /* เลเซอร์ไม่ครอบแถวนี้ */
        } else if (air) {
          advanceX = true;
        } else {
          hitBack = true;
        }
      }
    }
    if (advanceX) {
      px = Math.min(w - 2, px + 1);
      p.gauntletJumpTicks = 0;
      if (!crownHeist) {
        p.gauntletScore = (p.gauntletScore || 0) + 1;
      }
    } else if (hitBack) {
      if (crownHeist) {
        if (px <= 0) {
          p.gauntletEliminated = true;
          p.gauntletScore = 0;
        } else {
          p.gauntletScore = Math.max(0, (p.gauntletScore || 0) - 10);
          px = Math.max(0, px - 1);
        }
      } else {
        px = Math.max(0, px - 1);
      }
    }
    if ((p.gauntletJumpTicks || 0) > 0) p.gauntletJumpTicks--;
    p.x = px;
    p.y = py;
  });

  emitGauntletSync(sid, space);
}

function rescheduleAllGauntletTickers() {
  for (const [sid, space] of spaces) {
    const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
    if (!md || md.gameType !== 'gauntlet') continue;
    if (space.gauntletRun && space.gauntletRun.timerId) {
      clearInterval(space.gauntletRun.timerId);
      space.gauntletRun.timerId = null;
    }
    if (space.peers.size === 0) continue;
    if (!space.gauntletRun) {
      space.gauntletRun = newGauntletRunState(space);
    }
    ensureGauntletEndsAtIfNeeded(space);
    space.gauntletRun.timerId = setInterval(() => {
      runGauntletTick(sid, space);
    }, getGauntletTickMs());
  }
}

function getLobbyLayoutMapForSpace(space) {
  return (space.mapId && maps.get(space.mapId)) || space.mapData;
}

/** ห้องกำลังใช้เลย์เอาต์ LobbyB (mn8nx46h หรือแมป lobby ชื่อ LobbyB) — กัน mapId บน space ค้างค่าอื่นแต่ mapData เป็น LobbyB */
function serverMapIsPostCaseLobbyB(space) {
  if (!space) return false;
  if (space.mapId === POST_CASE_LOBBY_SPACE_ID) return true;
  const md = getLobbyLayoutMapForSpace(space);
  if (!md || md.gameType !== 'lobby') return false;
  const nm = String(md.name || '').trim().toLowerCase();
  return nm === 'lobbyb';
}

/** ให้ชื่อใน whitelist ตรงกับตอน join หลังเริ่มคดี (กันช่องว่าง/ยูนิโค้ดต่างรูปแบบ) */
function normalizeLobbyNickname(nickname) {
  const raw = String(nickname || '').trim();
  if (!raw) return 'ผู้เล่น';
  try {
    return raw.normalize('NFKC').toLowerCase();
  } catch (e) {
    return raw.toLowerCase();
  }
}

/** ห้องนี้เป็น LobbyB (โถงหลังคดี) แล้ว — ไม่ต้องย้ายซ้ำ */
function lobbySpaceAlreadyLobbyB(space, md) {
  if (!md || md.gameType !== 'lobby') return false;
  if (space.mapId === POST_CASE_LOBBY_SPACE_ID) return true;
  if (String(md.name || '').trim() === 'LobbyB') return true;
  return false;
}

function lobbyMapHasStartGameArea(md) {
  if (!md) return false;
  const namedLobbyA = String(md.name || '').trim().toLowerCase() === 'lobbya';
  if (md.gameType !== 'lobby' && !namedLobbyA) return false;
  const area = md.startGameArea;
  if (!area || !Array.isArray(area)) return false;
  for (let y = 0; y < area.length; y++) {
    const row = area[y];
    if (!row) continue;
    for (let x = 0; x < row.length; x++) if (row[x] === 1) return true;
  }
  return false;
}

/** ถ้าไม่ได้วาดพื้นที่เริ่มเกมในเอดิเตอร์ = ไม่บังคับ */
function lobbyHostStandingInStartArea(space, hostId) {
  const md = getLobbyLayoutMapForSpace(space);
  if (!lobbyMapHasStartGameArea(md)) return true;
  const p = space.peers.get(hostId);
  if (!p || p.x == null || p.y == null) return false;
  const tx = Math.floor(p.x);
  const ty = Math.floor(p.y);
  const row = md.startGameArea[ty];
  return !!(row && row[tx] === 1);
}

function isMapTileWalkableForSpawn(md, x, y) {
  const w = md.width || 20;
  const h = md.height || 15;
  if (x < 0 || x >= w || y < 0 || y >= h) return false;
  const row = md.objects && md.objects[y];
  if (row && row[x] === 1) return false;
  return true;
}

/** แปลง lobbyPlayerSpawns จากแมปเป็นอาร์เรย์ยาว 6 ช่อง (null หรือ {x,y}) */
function parseLobbyPlayerSpawnsFromMap(md) {
  const w = md.width || 20;
  const h = md.height || 15;
  const out = [null, null, null, null, null, null];
  const raw = md && md.lobbyPlayerSpawns;
  if (!Array.isArray(raw)) return out;
  for (let i = 0; i < 6 && i < raw.length; i++) {
    const cell = raw[i];
    if (!cell || typeof cell !== 'object') continue;
    const x = Math.floor(Number(cell.x));
    const y = Math.floor(Number(cell.y));
    if (!Number.isFinite(x) || !Number.isFinite(y)) continue;
    if (x < 0 || x >= w || y < 0 || y >= h) continue;
    out[i] = { x, y };
  }
  return out;
}

/**
 * จุดเกิดตอน join — random = สุ่มใน spawnArea / fixed = ปุ่มตั้งจุดเกิด / slots6 = P ตามลำดับเข้า (0=คนแรก)
 * โหมดพรมแดงยังถูกทับด้วย gauntletSpawnPositions หลัง join ตามเดิม
 */
function pickSpawnForJoin(md, joinOrderIndex) {
  if (!md) return { x: 1, y: 1 };
  const mode = md.lobbySpawnMode;
  const ord = joinOrderIndex | 0;
  if (mode === 'slots6' && ord >= 6) return pickRandomSpawnFromMap(md);
  const j = Math.min(Math.max(0, ord), 5);
  if (mode === 'fixed' && md.spawn) {
    const fx = Number.isFinite(Number(md.spawn.x)) ? Math.floor(Number(md.spawn.x)) : 1;
    const fy = Number.isFinite(Number(md.spawn.y)) ? Math.floor(Number(md.spawn.y)) : 1;
    const w = md.width || 20;
    const h = md.height || 15;
    const x = Math.max(0, Math.min(w - 1, fx));
    const y = Math.max(0, Math.min(h - 1, fy));
    if (isMapTileWalkableForSpawn(md, x, y)) return { x, y };
    return pickRandomSpawnFromMap(md);
  }
  if (mode === 'slots6') {
    const slots = parseLobbyPlayerSpawnsFromMap(md);
    const pick = slots[j];
    if (pick && isMapTileWalkableForSpawn(md, pick.x, pick.y)) return { x: pick.x, y: pick.y };
    return pickRandomSpawnFromMap(md);
  }
  return pickRandomSpawnFromMap(md);
}

/** สุ่มจุดเกิดในช่อง spawnArea=1 ที่เดินได้ — ไม่มีช่องว่าง = ใช้ spawn ค่าเดิมจากเอดิเตอร์ */
function pickRandomSpawnFromMap(md) {
  const fallback = md.spawn || { x: 1, y: 1 };
  const fx = Number.isFinite(Number(fallback.x)) ? Number(fallback.x) : 1;
  const fy = Number.isFinite(Number(fallback.y)) ? Number(fallback.y) : 1;
  const grid = md.spawnArea;
  if (!grid || !Array.isArray(grid)) return { x: fx, y: fy };
  const w = md.width || 20;
  const h = md.height || 15;
  const pool = [];
  for (let y = 0; y < h; y++) {
    const row = grid[y];
    if (!row) continue;
    for (let x = 0; x < w; x++) {
      if (Number(row[x]) === 1 && isMapTileWalkableForSpawn(md, x, y)) pool.push({ x, y });
    }
  }
  if (!pool.length) return { x: fx, y: fy };
  const idx = typeof crypto.randomInt === 'function'
    ? crypto.randomInt(0, pool.length)
    : Math.floor(Math.random() * pool.length);
  const pick = pool[idx];
  return { x: pick.x, y: pick.y };
}

/** ตอบผิดในเกมคำถาม — กลับจุดเกิดตามลำดับเข้า (เดียวกับ pickSpawnForJoin) แล้วดีดออกนอกโซนถ้าทับโซนตอบ */
function quizWrongAnswerRespawnPosition(md, joinOrderIndex) {
  const ord = joinOrderIndex | 0;
  const sp = pickSpawnForJoin(md, ord);
  return findNearestOutsideQuizAnswerZones(md, Number(sp.x) + 0.5, Number(sp.y) + 0.5);
}

function initTroublesomeState(space) {
  if (!space.troublesomeEligible) space.troublesomeEligible = new Set();
  if (space.troublesomeOfferSent == null) space.troublesomeOfferSent = false;
  if (space.suspectPickIndex == null) space.suspectPickIndex = 0;
  if (space.suspectPhaseActive == null) space.suspectPhaseActive = false;
}

function attemptTroublesomeRoll(sid, force) {
  const space = spaces.get(sid);
  if (!space || space.troublesomeOfferSent) return;
  const peerIds = [...space.peers.keys()];
  if (peerIds.length === 0) return;
  if (!force && space.troublesomeEligible.size < peerIds.length) return;
  space.troublesomeOfferSent = true;
  if (space.troublesomeDebTimer) clearTimeout(space.troublesomeDebTimer);
  if (space.troublesomeMaxTimer) clearTimeout(space.troublesomeMaxTimer);
  space.troublesomeDebTimer = null;
  space.troublesomeMaxTimer = null;
  let pool = peerIds.filter((id) => space.troublesomeEligible.has(id));
  if (pool.length === 0) pool = peerIds;
  const chosen = pool[Math.floor(Math.random() * pool.length)];
  space.troublesomeTargetId = chosen;
  space.troublesomeResponseReceived = false;
  io.to(chosen).emit('troublesome-offer', { seconds: 15 });
}

function scheduleTroublesomeRoll(sid) {
  const space = spaces.get(sid);
  if (!space || space.troublesomeOfferSent) return;
  if (space.troublesomeDebTimer) clearTimeout(space.troublesomeDebTimer);
  space.troublesomeDebTimer = setTimeout(() => attemptTroublesomeRoll(sid, false), 450);
  if (!space.troublesomeMaxTimer) {
    space.troublesomeMaxTimer = setTimeout(() => attemptTroublesomeRoll(sid, true), 8000);
  }
}

/**
 * ห้องทดสอบเอดิเตอร์ / join ด้วย mapId: mapData บน space อาจยังเป็น lobby แต่ไคลเอนต์เล่น quiz_carry จากพารามิเตอร์
 * — ให้ lobby Ready/START ทำงานถ้า mapId ชี้แมป quiz_carry หรือเป็นห้อง preview
 */
function spaceAllowsQuizCarryLobbyRelaxed(space) {
  if (!space) return false;
  if (space.mapId) {
    const byId = maps.get(space.mapId);
    if (byId && byId.gameType === 'quiz_carry') return true;
  }
  const md = space.mapData;
  if (md && md.gameType === 'quiz_carry') return true;
  return !!(space.previewEditorTest
    || (space.isPrivate && String(space.spaceName || '').toLowerCase() === 'preview'));
}

io.on('connection', (socket) => {
  socket.on('join-space', ({ spaceId, nickname, characterId }, cb) => {
    const space = spaces.get(spaceId);
    if (!space || !space.mapData) return cb && cb({ ok: false, error: 'ไม่พบห้อง' });
    const maxPlayers = space.maxPlayers || 10;
    const mdJoinPre = (space.mapId && maps.get(space.mapId)) || space.mapData;
    if (mdJoinPre && mdJoinPre.gameType === 'gauntlet' && space.peers.size >= GAUNTLET_MAX_PLAYERS) {
      return cb && cb({ ok: false, error: 'เกมพรมแดงรับได้สูงสุด ' + GAUNTLET_MAX_PLAYERS + ' คน' });
    }
    if (mdJoinPre && mdJoinPre.gameType === 'space_shooter' && space.peers.size >= GAUNTLET_MAX_PLAYERS) {
      return cb && cb({ ok: false, error: 'ยิงยานอวกาศรับได้สูงสุด ' + GAUNTLET_MAX_PLAYERS + ' คน' });
    }
    if (mdJoinPre && mdJoinPre.gameType === 'balloon_boss' && space.peers.size >= GAUNTLET_MAX_PLAYERS) {
      return cb && cb({ ok: false, error: 'ลูกโป้งยิงบอสรับได้สูงสุด ' + GAUNTLET_MAX_PLAYERS + ' คน' });
    }
    if (space.peers.size >= maxPlayers) return cb && cb({ ok: false, error: 'ห้องเต็มแล้ว (' + space.peers.size + '/' + maxPlayers + ')' });
    const joinNickNorm = normalizeLobbyNickname(nickname);
    if (space.joinLocked) {
      const wl = space.caseParticipantNicknames;
      if (wl && wl.size > 0) {
        if (!wl.has(joinNickNorm)) {
          return cb && cb({ ok: false, error: 'ห้องนี้เริ่มคดีแล้ว ไม่รับผู้เล่นเพิ่ม' });
        }
      } else {
        return cb && cb({ ok: false, error: 'ห้องนี้เริ่มคดีแล้ว ไม่รับผู้เล่นเพิ่ม' });
      }
    }
    socket.join(spaceId);
    socket.data.spaceId = spaceId;
    if (!space.hostId) space.hostId = socket.id;
    if (serverMapIsPostCaseLobbyB(space)) initTroublesomeState(space);
    const mdJoin = (space.mapId && maps.get(space.mapId)) || space.mapData;
    const spawnJoinOrder = space.peers.size;
    const spawnPt = pickSpawnForJoin(mdJoin, spawnJoinOrder);
    const bbStartBalloons = Math.max(1, Math.min(12, Math.floor(Number(mdJoin.balloonBossBalloonsPerPlayer)) || 3));
    const peer = {
      id: socket.id, x: +spawnPt.x, y: +spawnPt.y, direction: 'down', nickname: nickname || 'ผู้เล่น', ready: false, characterId: characterId || null, voiceMicOn: true,
      spawnJoinOrder,
      gauntletJumpTicks: 0, gauntletScore: 0, gauntletJumpPending: false, gauntletEliminated: false, spaceShooterScore: 0,
      balloonBossScore: 0, balloonBossBalloons: mdJoin.gameType === 'balloon_boss' ? bbStartBalloons : 5, balloonBossEliminated: false,
    };
    if (mdJoin.gameType === 'quiz_battle' && quizBattlePathModeActiveServer(mdJoin)) {
      const sn = snapPositionOntoQuizBattlePathServer(mdJoin, Number(peer.x) + 0.5, Number(peer.y) + 0.5);
      peer.x = sn.x;
      peer.y = sn.y;
    }
    space.peers.set(socket.id, peer);
    if (spaceAllowsQuizCarryLobbyRelaxed(space)) {
      if (!space.quizCarryLobbyReady || typeof space.quizCarryLobbyReady !== 'object') space.quizCarryLobbyReady = {};
      space.quizCarryLobbyReady[socket.id] = false;
      io.to(spaceId).emit('quiz-carry-lobby-sync', { readyMap: { ...space.quizCarryLobbyReady } });
    }
    if (mdJoin.gameType === 'gauntlet') {
      const ord = [...space.peers.keys()].indexOf(socket.id);
      const pos = gauntletSpawnPositions(mdJoin, space.peers.size);
      const pt = pos[ord] != null ? pos[ord] : pos[pos.length - 1];
      peer.x = pt.x;
      peer.y = pt.y;
      peer.gauntletJumpTicks = 0;
      if (isGauntletCrownHeistMapBySpace(space)) {
        peer.gauntletScore = 100;
        peer.gauntletEliminated = false;
        if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
        space.gauntletCrownLobbyReady[socket.id] = false;
        io.to(spaceId).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
      }
      startGauntletTicker(spaceId, space);
    }
    const peersList = [...space.peers.values()];
    const mapData = mdJoin;
    const joinCb = {
      ok: true,
      mapData,
      mapId: space.mapId || null,
      peers: peersList,
      hostId: space.hostId,
      spaceName: space.spaceName || spaceId,
      isPrivate: !!space.isPrivate,
      roomCode: space.isPrivate ? spaceId : null,
      maxPlayers: space.maxPlayers || 10,
      suspectPhaseActive: !!space.suspectPhaseActive && serverMapIsPostCaseLobbyB(space),
      suspectPickIndex: typeof space.suspectPickIndex === 'number' ? space.suspectPickIndex : 0,
    };
    if (mdJoin.gameType === 'quiz_carry' || spaceAllowsQuizCarryLobbyRelaxed(space)) {
      try {
        const qs = loadQuizSettings();
        joinCb.quizCarrySettingsSnap = {
          carryMapPanelTheme: qs.carryMapPanelTheme,
          carryEmbedCountdownTheme: qs.carryEmbedCountdownTheme,
          carryChoicePlaqueThemes: qs.carryChoicePlaqueThemes,
          carryChoicePlaqueTheme: qs.carryChoicePlaqueTheme,
          carryChoicePlaqueMapScale: qs.carryChoicePlaqueMapScale,
          carryReadMs: qs.carryReadMs,
          carryAnswerMs: qs.carryAnswerMs,
          carrySessionLength: qs.carrySessionLength,
          carryWalkSpeedMultForMapId: qs.carryWalkSpeedMultForMapId,
          carryWalkSpeedMult: qs.carryWalkSpeedMult,
        };
      } catch (e) { /* ignore */ }
    }
    if (mdJoin.gameType === 'quiz') {
      try {
        const qsQuiz = loadQuizSettings();
        joinCb.quizSettingsSnap = {
          quizMapPanelTheme: qsQuiz.quizMapPanelTheme,
        };
      } catch (e) { /* ignore */ }
    }
    if (mdJoin.gameType === 'gauntlet' && space.gauntletRun) {
      joinCb.gauntletEndsAt = space.gauntletRun.endsAt != null ? space.gauntletRun.endsAt : null;
    }
    if (typeof cb === 'function') cb(joinCb);
    socket.to(spaceId).emit('user-joined', peer);
    if (space.voiceInits) {
      for (const [peerId, initData] of Object.entries(space.voiceInits)) {
        if (space.peers.get(peerId)?.voiceMicOn) socket.emit('voice-init', { from: peerId, data: initData });
      }
    }
  });

  /** ห้องทดสอบจากเอดิเตอร์ (ชื่อ preview) — สลับโฮสต์ให้เครื่องนี้กดเริ่มเกมได้ */
  socket.on('preview-claim-host', (cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return reply({ ok: false, error: 'ไม่อยู่ในห้อง' });
    const isPreviewEditorRoom = !!(space.previewEditorTest
      || (space.isPrivate && String(space.spaceName || '').toLowerCase() === 'preview'));
    if (!isPreviewEditorRoom) return reply({ ok: false, error: 'ใช้ได้เฉพาะห้องทดสอบจากเอดิเตอร์' });
    space.hostId = socket.id;
    io.to(sid).emit('host-changed', { hostId: socket.id });
    return reply({ ok: true });
  });

  socket.on('troublesome-eligible', () => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !serverMapIsPostCaseLobbyB(space) || space.troublesomeOfferSent) return;
    initTroublesomeState(space);
    space.troublesomeEligible.add(socket.id);
    scheduleTroublesomeRoll(sid);
  });

  socket.on('troublesome-response', (data) => {
    const accept = !!(data && data.accept);
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !serverMapIsPostCaseLobbyB(space)) return;
    if (space.troublesomeTargetId && socket.id !== space.troublesomeTargetId) return;
    if (space.troublesomeResponseReceived) return;
    space.troublesomeResponseReceived = true;
    space.troublesomeAccept = accept;
    let idx = Math.floor(Number(space.suspectPickIndex));
    if (Number.isNaN(idx) || idx < 0 || idx > 2) idx = 0;
    space.suspectPickIndex = idx;
    space.suspectPhaseActive = true;
    io.to(sid).emit('suspect-phase-open', {
      hostId: space.hostId,
      selectedIndex: space.suspectPickIndex,
      disruptorAccepted: accept
    });
    socket.emit('troublesome-ack', { ok: true, accept });
  });

  socket.on('suspect-pick-select', (data) => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !serverMapIsPostCaseLobbyB(space) || !space.suspectPhaseActive) return;
    if (space.hostId !== socket.id) return;
    let idx = Math.floor(Number(data && data.index));
    if (Number.isNaN(idx) || idx < 0 || idx > 2) return;
    space.suspectPickIndex = idx;
    io.to(sid).emit('suspect-pick-update', { selectedIndex: idx });
  });

  socket.on('suspect-pick-start', (data, cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !serverMapIsPostCaseLobbyB(space)) {
      return reply({ ok: false, error: 'ไม่พร้อม — ต้องอยู่โถง LobbyB' });
    }
    if (!space.suspectPhaseActive) {
      return reply({ ok: false, error: 'ไม่อยู่ในขั้นเลือกผู้ต้องสงสัย' });
    }
    if (space.hostId !== socket.id) {
      return reply({ ok: false, error: 'เฉพาะ host กดเริ่มสืบสวนได้' });
    }
    const md = maps.get(SUSPECT_INVESTIGATION_QUIZ_MAP_ID);
    if (!md) {
      return reply({ ok: false, error: 'ไม่พบฉากเกม (mng8a80o) บนเซิร์ฟเวอร์' });
    }
    const qErr = validateQuizMap(md);
    if (qErr) {
      return reply({ ok: false, error: qErr });
    }
    space.suspectPhaseActive = false;
    clearSpaceQuizTimers(space);
    space.mapId = SUSPECT_INVESTIGATION_QUIZ_MAP_ID;
    space.mapData = md;
    let si = 0;
    space.peers.forEach((p) => {
      const sp = pickSpawnForJoin(md, si++);
      p.x = sp.x;
      p.y = sp.y;
      p.direction = 'down';
    });
    const peersSnap = [...space.peers.values()].map((p) => ({
      id: p.id,
      x: p.x,
      y: p.y,
      direction: p.direction || 'down',
      nickname: p.nickname,
      ready: !!p.ready,
      characterId: p.characterId ?? null
    }));
    const selectedIndex = typeof space.suspectPickIndex === 'number' ? space.suspectPickIndex : 0;
    io.to(sid).emit('suspect-investigation-start', { selectedIndex });
    io.to(sid).emit('game-start', {
      quizMode: true,
      stayInRoomLobby: true,
      mapId: SUSPECT_INVESTIGATION_QUIZ_MAP_ID,
      peersSnap
    });
    setTimeout(() => {
      const spNow = spaces.get(sid);
      if (!spNow || !spNow.peers.has(socket.id)) return;
      const mdLive = maps.get(SUSPECT_INVESTIGATION_QUIZ_MAP_ID);
      if (!mdLive) return;
      startQuizGame(sid, spNow, mdLive);
    }, 900);
    reply({ ok: true });
  });

  /* พร้อมแล้ว — ไม่บังคับจำนวนคนในห้อง */
  socket.on('set-ready', ({ ready }) => {
    for (const [sid, space] of spaces) {
      if (space.peers.has(socket.id)) {
        const p = space.peers.get(socket.id);
        if (p) p.ready = !!ready;
        io.to(sid).emit('peer-ready', { id: socket.id, ready: !!ready });
        break;
      }
    }
  });

  socket.on('start-game', (data, cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    for (const [sid, space] of spaces) {
      if (space.peers.has(socket.id) && space.hostId === socket.id) {
        let lobbyLevel = (data && data.lobbyLevel != null) ? String(data.lobbyLevel).trim() : '';
        let caseId = (data && data.caseId != null) ? String(data.caseId).trim() : '';
        if (lobbyLevel && !/^[1-5]$/.test(lobbyLevel)) lobbyLevel = '';
        if (caseId && !/^[1-3]$/.test(caseId)) caseId = '';
        ensurePostCaseLobbyMapLoaded();
        const mdBefore = getLobbyLayoutMapForSpace(space);
        if (mdBefore && mdBefore.gameType === 'quiz') {
          const qErr = validateQuizMap(mdBefore);
          if (qErr) return reply({ ok: false, error: qErr });
          clearSpaceQuizTimers(space);
          startQuizGame(sid, space, mdBefore);
          io.to(sid).emit('game-start', { quizMode: true, stayInRoomLobby: true });
          return reply({ ok: true });
        }
        const detectiveB = !!(data && data.detectiveLobbyBStart);
        if (detectiveB && (!lobbyLevel || !caseId)) {
          return reply({ ok: false, error: 'กรุณาเลือกระดับและคดีให้ครบก่อนเริ่ม' });
        }
        const mapNameNorm = mdBefore ? String(mdBefore.name || '').trim().toLowerCase() : '';
        const isNamedLobbyA = mapNameNorm === 'lobbya';
        const notZepOrFrogger = !!(mdBefore && mdBefore.gameType !== 'zep' && mdBefore.gameType !== 'frogger' && mdBefore.gameType !== 'gauntlet');
        /* LobbyA: gameType lobby, หรือชื่อฉาก LobbyA (กันเซฟผิดเป็น zep), หรือ wizard + ไม่ใช่มินิเกม zep/frogger/gauntlet (รวม quiz/stack ฯลฯ) */
        const isLobbyADetectiveStart = !!(mdBefore && !lobbySpaceAlreadyLobbyB(space, mdBefore)
          && lobbyLevel && caseId && maps.has(POST_CASE_LOBBY_SPACE_ID)
          && (
            mdBefore.gameType === 'lobby'
            || isNamedLobbyA
            || (detectiveB && notZepOrFrogger)
          ));
        if (detectiveB && lobbyLevel && caseId && !isLobbyADetectiveStart) {
          return reply({ ok: false, error: 'ย้ายไป LobbyB ไม่ได้ — ต้องอยู่ฉาก LobbyA (หรือล็อบบี้ชื่อ LobbyA) และเซิร์ฟต้องมีไฟล์แผนที่ LobbyB' });
        }
        if (!lobbyHostStandingInStartArea(space, socket.id)) {
          return reply({ ok: false, error: 'ยืนในพื้นที่เริ่มเกม (สีส้มในเอดิเตอร์) ก่อนกดเริ่ม' });
        }
        if (isLobbyADetectiveStart) {
          space.mapId = POST_CASE_LOBBY_SPACE_ID;
          space.mapData = maps.get(POST_CASE_LOBBY_SPACE_ID);
          const caseNickWl = new Set();
          space.peers.forEach((p) => {
            caseNickWl.add(normalizeLobbyNickname(p.nickname));
          });
          space.caseParticipantNicknames = caseNickWl;
          space.joinLocked = true;
          space.troublesomeOfferSent = false;
          space.troublesomeTargetId = null;
          space.troublesomeResponseReceived = false;
          space.suspectPhaseActive = false;
          space.suspectPickIndex = 0;
          if (space.troublesomeEligible) space.troublesomeEligible.clear();
          else space.troublesomeEligible = new Set();
          if (space.troublesomeDebTimer) clearTimeout(space.troublesomeDebTimer);
          if (space.troublesomeMaxTimer) clearTimeout(space.troublesomeMaxTimer);
          space.troublesomeDebTimer = null;
          space.troublesomeMaxTimer = null;
          initTroublesomeState(space);
          let li = 0;
          space.peers.forEach((p) => {
            const sp = pickSpawnForJoin(space.mapData, li++);
            p.x = sp.x;
            p.y = sp.y;
            p.direction = 'down';
          });
          const peersSnap = [...space.peers.values()].map((p) => ({
            id: p.id,
            x: p.x,
            y: p.y,
            direction: p.direction || 'down',
            nickname: p.nickname,
            ready: !!p.ready,
            characterId: p.characterId ?? null
          }));
          io.to(sid).emit('game-start', {
            stayInRoomLobby: true,
            mapId: POST_CASE_LOBBY_SPACE_ID,
            lobbyLevel,
            caseId,
            peersSnap
          });
          return reply({ ok: true });
        }
        const mapId = (data && data.mapId) ? String(data.mapId).trim() : null;
        let peersSnap = null;
        let gauntletEndsAtEmit = undefined;
        if (mapId && maps.has(mapId)) {
          const prevMapIdForReturn = space.mapId;
          space.mapId = mapId;
          space.mapData = maps.get(mapId);
          const md = space.mapData;
          if (md && md.gameType === 'quiz_battle' && quizBattlePathModeActiveServer(md)) {
            space.peers.forEach((p) => {
              const sn = snapPositionOntoQuizBattlePathServer(md, Number(p.x), Number(p.y));
              p.x = sn.x;
              p.y = sn.y;
            });
          }
          if (!md || md.gameType !== 'gauntlet') {
            stopGauntletTicker(space);
            space.gauntletReturnMapId = null;
            space.gauntletRun = null;
          }
          if (md && md.gameType === 'gauntlet') {
            stopGauntletTicker(space);
            space.gauntletReturnMapId = prevMapIdForReturn;
            initGauntletPeersAll(space, md);
            ensureGauntletEndsAtIfNeeded(space);
            startGauntletTicker(sid, space);
            gauntletEndsAtEmit = space.gauntletRun && space.gauntletRun.endsAt != null
              ? space.gauntletRun.endsAt
              : null;
            peersSnap = [...space.peers.values()].map((p) => ({
              id: p.id,
              x: p.x,
              y: p.y,
              direction: p.direction || 'down',
              nickname: p.nickname,
              ready: !!p.ready,
              characterId: p.characterId ?? null,
              gauntletJumpTicks: p.gauntletJumpTicks || 0,
              gauntletScore: p.gauntletScore || 0,
              gauntletEliminated: !!p.gauntletEliminated,
            }));
          }
        }
        const gameStartPayload = {
          mapId: mapId || undefined,
          lobbyLevel: lobbyLevel || undefined,
          caseId: caseId || undefined,
          peersSnap: peersSnap || undefined,
        };
        if (peersSnap) gameStartPayload.gauntletEndsAt = gauntletEndsAtEmit != null ? gauntletEndsAtEmit : null;
        io.to(sid).emit('game-start', gameStartPayload);
        return reply({ ok: true });
      }
    }
    reply({ ok: false, error: 'ไม่ใช่ host' });
  });

  socket.on('disconnect', () => {
    let sid = socket.data.spaceId;
    let space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) {
      for (const [s, sp] of spaces) {
        if (sp.peers.has(socket.id)) { sid = s; space = sp; break; }
      }
    }
    if (!space || !space.peers.has(socket.id)) return;
    const wasHost = space.hostId === socket.id;
    if (space.voiceInits) delete space.voiceInits[socket.id];
    if (space.troublesomeEligible) space.troublesomeEligible.delete(socket.id);
    if (space.quizSession && space.quizSession.players) delete space.quizSession.players[socket.id];
    if (space.gauntletPreviewRowsBySocket) space.gauntletPreviewRowsBySocket.delete(socket.id);
    if (space.quizCarryLobbyReady && typeof space.quizCarryLobbyReady === 'object') {
      delete space.quizCarryLobbyReady[socket.id];
      if (spaceAllowsQuizCarryLobbyRelaxed(space)) {
        io.to(sid).emit('quiz-carry-lobby-sync', { readyMap: { ...space.quizCarryLobbyReady } });
      }
    }
    if (space.gauntletCrownLobbyReady && typeof space.gauntletCrownLobbyReady === 'object') {
      delete space.gauntletCrownLobbyReady[socket.id];
      if (isGauntletCrownHeistMapBySpace(space)) {
        io.to(sid).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
      }
    }
    space.peers.delete(socket.id);
    if (space.peers.size === 0) {
      stopGauntletTicker(space);
      clearSpaceQuizTimers(space);
      space.quizSession = null;
      spaces.delete(sid);
    } else {
      if (wasHost) {
        const firstPeer = space.peers.values().next().value;
        if (firstPeer) {
          space.hostId = firstPeer.id;
          io.to(sid).emit('host-changed', { hostId: firstPeer.id });
        }
      }
      io.to(sid).emit('user-left', { id: socket.id });
    }
  });

  socket.on('gauntlet-jump', () => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    const p = space.peers.get(socket.id);
    const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
    if (!md || md.gameType !== 'gauntlet') return;
    if (space.gauntletRun && space.gauntletRun.crownRunHeld) return;
    if (isGauntletCrownHeistMapBySpace(space) && p.gauntletEliminated) return;
    if ((p.gauntletJumpTicks || 0) > 0) return;
    p.gauntletJumpPending = true;
  });

  socket.on('gauntlet-crown-begin-run', (cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return reply({ ok: false });
    const gr = space.gauntletRun;
    if (!gr) return reply({ ok: false });
    const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
    if (!md || md.gameType !== 'gauntlet' || !isGauntletCrownHeistMapBySpace(space)) return reply({ ok: false });
    const previewRoom = !!(space.previewEditorTest
      || (space.isPrivate && String(space.spaceName || '').toLowerCase() === 'preview'));
    if (!previewRoom && space.hostId !== socket.id) return reply({ ok: false, error: 'host' });
    if (!gr.crownRunHeld) return reply({ ok: true, already: true });
    gr.crownRunHeld = false;
    ensureGauntletEndsAtIfNeeded(space);
    emitGauntletSync(sid, space);
    return reply({ ok: true });
  });

  /** Client ส่งแถว y ของบอททดสอบ (ไม่อยู่ใน peers) เพื่อให้ spawn lane obstacles บนแถวนั้น */
  socket.on('gauntlet-preview-rows', (data) => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
    if (!md || md.gameType !== 'gauntlet') return;
    if (space.gauntletRun && space.gauntletRun.crownRunHeld) return;
    const hh = md.height || 15;
    if (!space.gauntletPreviewRowsBySocket) space.gauntletPreviewRowsBySocket = new Map();
    const raw = data && Array.isArray(data.ys) ? data.ys : [];
    const set = new Set();
    const cap = Math.min(raw.length, 48);
    for (let i = 0; i < cap; i++) {
      const fy = Math.floor(Number(raw[i]));
      if (Number.isFinite(fy) && fy >= 0 && fy < hh) set.add(fy);
    }
    space.gauntletPreviewRowsBySocket.set(socket.id, set);
  });

  socket.on('quiz-carry-lobby-sync-request', () => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    if (!spaceAllowsQuizCarryLobbyRelaxed(space)) return;
    if (!space.quizCarryLobbyReady || typeof space.quizCarryLobbyReady !== 'object') {
      space.quizCarryLobbyReady = {};
    }
    for (const id of space.peers.keys()) {
      if (space.quizCarryLobbyReady[id] === undefined) space.quizCarryLobbyReady[id] = false;
    }
    socket.emit('quiz-carry-lobby-sync', { readyMap: { ...space.quizCarryLobbyReady } });
  });

  socket.on('quiz-carry-lobby-ready', (data) => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    if (!spaceAllowsQuizCarryLobbyRelaxed(space)) return;
    if (!space.quizCarryLobbyReady || typeof space.quizCarryLobbyReady !== 'object') space.quizCarryLobbyReady = {};
    for (const id of space.peers.keys()) {
      if (space.quizCarryLobbyReady[id] === undefined) space.quizCarryLobbyReady[id] = false;
    }
    space.quizCarryLobbyReady[socket.id] = !!(data && data.ready);
    io.to(sid).emit('quiz-carry-lobby-sync', { readyMap: { ...space.quizCarryLobbyReady } });
  });

  socket.on('quiz-carry-lobby-start', (_data, cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return reply({ ok: false, error: 'ไม่อยู่ในห้อง' });
    if (!spaceAllowsQuizCarryLobbyRelaxed(space)) return reply({ ok: false, error: 'ห้องนี้ไม่ใช่โหมด lobby หยิบมาวาง / พรีวิว' });
    if (space.hostId !== socket.id) return reply({ ok: false, error: 'เฉพาะโฮสต์กด START' });
    const rm = space.quizCarryLobbyReady || {};
    const humanIds = [...space.peers.keys()];
    const allReady = humanIds.length > 0 && humanIds.every((id) => rm[id]);
    if (!allReady) return reply({ ok: false, error: 'ยังมีผู้เล่นที่ยังไม่ Ready' });
    io.to(sid).emit('quiz-carry-lobby-started', {});
    reply({ ok: true });
  });

  socket.on('gauntlet-crown-lobby-sync-request', () => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    if (!isGauntletCrownHeistMapBySpace(space)) return;
    if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') {
      space.gauntletCrownLobbyReady = {};
    }
    for (const id of space.peers.keys()) {
      if (space.gauntletCrownLobbyReady[id] === undefined) space.gauntletCrownLobbyReady[id] = false;
    }
    socket.emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
  });

  socket.on('gauntlet-crown-lobby-ready', (data) => {
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return;
    if (!isGauntletCrownHeistMapBySpace(space)) return;
    if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
    for (const id of space.peers.keys()) {
      if (space.gauntletCrownLobbyReady[id] === undefined) space.gauntletCrownLobbyReady[id] = false;
    }
    space.gauntletCrownLobbyReady[socket.id] = !!(data && data.ready);
    io.to(sid).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
  });

  socket.on('gauntlet-crown-lobby-start', (_data, cb) => {
    const reply = typeof cb === 'function' ? cb : () => {};
    const sid = socket.data.spaceId;
    const space = sid ? spaces.get(sid) : null;
    if (!space || !space.peers.has(socket.id)) return reply({ ok: false, error: 'ไม่อยู่ในห้อง' });
    if (!isGauntletCrownHeistMapBySpace(space)) return reply({ ok: false, error: 'ไม่ใช่แมป crown' });
    if (space.hostId !== socket.id) return reply({ ok: false, error: 'เฉพาะโฮสต์กด START' });
    const gr = space.gauntletRun;
    if (!gr || !gr.crownRunHeld) return reply({ ok: false, error: 'เริ่มแล้ว' });
    const rm = space.gauntletCrownLobbyReady || {};
    const humanIds = [...space.peers.keys()];
    const allReady = humanIds.length > 0 && humanIds.every((id) => rm[id]);
    if (!allReady) return reply({ ok: false, error: 'ยังมีผู้เล่นที่ยังไม่ Ready' });
    io.to(sid).emit('gauntlet-crown-lobby-started', {});
    reply({ ok: true });
  });

  socket.on('move', (data) => {
    for (const [sid, space] of spaces) {
      if (space.peers.has(socket.id)) {
        const p = space.peers.get(socket.id);
        const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
        if (md && md.gameType === 'gauntlet') {
          const out = { id: socket.id, x: p.x, y: p.y, direction: p.direction || 'down', characterId: p.characterId };
          socket.emit('user-move', out);
          break;
        }
        let nx = data.x;
        let ny = data.y;
        const sess = space.quizSession;
        const mdQuiz = (sess && sess.quizMapMd) || md;
        if (p && sess && sess.active && mdQuiz && mdQuiz.gameType === 'quiz') {
          const st = sess.players && sess.players[socket.id];
          if (st && !st.eliminated) {
            const tx = Math.floor(Number(nx));
            const ty = Math.floor(Number(ny));
            const blockTrue = st.cannotTrue && quizCellOn(mdQuiz.quizTrueArea, tx, ty);
            const blockFalse = st.cannotFalse && quizCellOn(mdQuiz.quizFalseArea, tx, ty);
            if (blockTrue || blockFalse) {
              nx = p.x;
              ny = p.y;
            }
          }
        }
        if (p && md && md.gameType === 'quiz_carry' && md.quizCarryHubArea) {
          const txN = Number(nx);
          const tyN = Number(ny);
          if (Number.isFinite(txN) && Number.isFinite(tyN) && quizCarryFootprintOverlapsHubServer(md, txN, tyN)) {
            nx = p.x;
            ny = p.y;
          }
        }
        if (p && md && md.gameType === 'quiz_battle' && quizBattlePathModeActiveServer(md)) {
          const txN = Number(nx);
          const tyN = Number(ny);
          if (!Number.isFinite(txN) || !Number.isFinite(tyN)) {
            nx = p.x;
            ny = p.y;
          } else if (!quizBattleFootprintFullyOnPathServer(md, txN, tyN)) {
            nx = p.x;
            ny = p.y;
          }
          const sn = snapPositionOntoQuizBattlePathServer(md, Number(nx), Number(ny));
          nx = sn.x;
          ny = sn.y;
        }
        if (p && md && md.gameType === 'space_shooter' && data && data.spaceShooterScore != null) {
          const ns = Math.floor(Number(data.spaceShooterScore));
          if (Number.isFinite(ns) && ns >= 0) {
            const prev = Math.max(0, p.spaceShooterScore | 0);
            if (ns <= prev + 35) p.spaceShooterScore = Math.max(prev, ns);
          }
        }
        if (p && md && md.gameType === 'balloon_boss' && data) {
          const bbDefaultBalloons = Math.max(1, Math.min(12, Math.floor(Number(md.balloonBossBalloonsPerPlayer)) || 3));
          if (data.balloonBossScore != null) {
            const ns = Math.floor(Number(data.balloonBossScore));
            if (Number.isFinite(ns) && ns >= 0) {
              const prev = Math.max(0, p.balloonBossScore | 0);
              if (ns <= prev + 25) p.balloonBossScore = Math.max(prev, ns);
            }
          }
          if (data.balloonBossBalloons != null) {
            const nb = Math.floor(Number(data.balloonBossBalloons));
            if (Number.isFinite(nb) && nb >= 0) {
              const prevB = typeof p.balloonBossBalloons === 'number' && Number.isFinite(p.balloonBossBalloons)
                ? Math.floor(p.balloonBossBalloons)
                : bbDefaultBalloons;
              if (nb <= prevB && nb >= Math.max(0, prevB - 2)) p.balloonBossBalloons = nb;
            }
          }
          if (data.balloonBossEliminated) p.balloonBossEliminated = true;
        }
        if (p) {
          p.x = nx;
          p.y = ny;
          p.direction = data.direction || p.direction;
          const out = { id: socket.id, x: nx, y: ny, direction: p.direction, characterId: p.characterId };
          if (md && md.gameType === 'space_shooter') out.spaceShooterScore = Math.max(0, p.spaceShooterScore | 0);
          if (md && md.gameType === 'balloon_boss') {
            const bbDef = Math.max(1, Math.min(12, Math.floor(Number(md.balloonBossBalloonsPerPlayer)) || 3));
            out.balloonBossScore = Math.max(0, p.balloonBossScore | 0);
            out.balloonBossBalloons = typeof p.balloonBossBalloons === 'number' && Number.isFinite(p.balloonBossBalloons)
              ? Math.max(0, Math.floor(p.balloonBossBalloons))
              : bbDef;
            out.balloonBossEliminated = !!p.balloonBossEliminated;
          }
          if (nx !== data.x || ny !== data.y) socket.emit('user-move', out);
          socket.to(sid).emit('user-move', out);
        }
        break;
      }
    }
  });

  socket.on('lobby-interact', (data, ack) => {
    const reply = typeof ack === 'function' ? ack : () => {};
    const tx = Math.floor(Number(data && data.x));
    const ty = Math.floor(Number(data && data.y));
    for (const [sid, space] of spaces) {
      if (!space.peers.has(socket.id)) continue;
      const p = space.peers.get(socket.id);
      const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
      if (!md) return reply({ ok: false, error: 'ไม่มีแผนที่' });
      const w = md.width || 20;
      const h = md.height || 15;
      if (Number.isNaN(tx) || Number.isNaN(ty) || tx < 0 || tx >= w || ty < 0 || ty >= h) {
        return reply({ ok: false, error: 'จุดไม่ถูกต้อง' });
      }
      if (!md.interactive || !md.interactive[ty] || md.interactive[ty][tx] !== 1) {
        return reply({ ok: false, error: 'ไม่มีจุดโต้ตอบที่นี่' });
      }
      const px = Math.floor(Number(p.x));
      const py = Math.floor(Number(p.y));
      const neighbors = [[0, 0], [0, -1], [0, 1], [-1, 0], [1, 0]];
      let near = false;
      for (const [dx, dy] of neighbors) {
        if (px + dx === tx && py + dy === ty) { near = true; break; }
      }
      if (!near) return reply({ ok: false, error: 'เข้าใกล้จุดสีเขียว (ช่องโต้ตอบ) ก่อน' });
      const nick = (p.nickname || '').trim() || 'ผู้เล่น';
      io.to(sid).emit('lobby-interact', { id: socket.id, nickname: nick, x: tx, y: ty });
      return reply({ ok: true });
    }
    reply({ ok: false, error: 'ไม่ได้อยู่ในห้อง' });
  });

  socket.on('chat', (text) => {
    for (const [sid, space] of spaces) {
      if (socket.rooms.has(sid)) {
        const nick = space.peers.get(socket.id)?.nickname || '';
        io.to(sid).emit('chat', { id: socket.id, text, time: new Date(), nickname: nick });
        break;
      }
    }
  });

  socket.on('voice-state', ({ micOn }) => {
    for (const [sid, space] of spaces) {
      if (space.peers.has(socket.id)) {
        const p = space.peers.get(socket.id);
        if (p) p.voiceMicOn = micOn !== false;
        if (micOn === false && space.voiceInits) delete space.voiceInits[socket.id];
        io.to(sid).emit('peer-voice-state', { id: socket.id, micOn: micOn !== false });
        break;
      }
    }
  });

  socket.on('voice-activity', ({ level }) => {
    const sid = socket.data.spaceId;
    if (!sid || !spaces.get(sid)) return;
    const until = Date.now() + 400;
    io.to(sid).emit('peer-speaking', { id: socket.id, level: typeof level === 'number' ? level : 0.5, until });
  });

  socket.on('voice-init', (data) => {
    for (const [sid, space] of spaces) {
      if (socket.rooms.has(sid)) {
        if (!space.voiceInits) space.voiceInits = {};
        space.voiceInits[socket.id] = data;
        io.to(sid).emit('voice-init', { from: socket.id, data });
        break;
      }
    }
  });

  socket.on('voice-chunk', (data) => {
    for (const [sid, space] of spaces) {
      if (socket.rooms.has(sid)) {
        socket.to(sid).emit('voice-chunk', { from: socket.id, data });
        break;
      }
    }
  });

  socket.on('webrtc-signal', (data) => {
    const { to, type, sdp, candidate } = data;
    if (!to) return;
    for (const [sid, space] of spaces) {
      if (socket.rooms.has(sid) && space.peers.has(to)) {
        io.to(to).emit('webrtc-signal', { from: socket.id, type, sdp, candidate });
        break;
      }
    }
  });
});

loadMaps();
server.listen(PORT, () => console.log('Game', PORT));