<?php
declare(strict_types=1);

/**
 * สาธารณะ — ไม่ต้องล็อกอินแอดมิน
 * เก็บ/อ่าน "สีตัวละครในล็อบบี้" (theme color + skin tone) แบบ cross-device
 * ผูกกับ jdPlayerKey เหมือน player-coins.php (guest account: providerUserId = key)
 *
 * GET  ?playerKey=...                       → { ok, colorThemeIndex, skinToneIndex }
 * POST { playerKey, colorThemeIndex, skinToneIndex } → บันทึกแล้วคืนค่าที่บันทึก
 *
 * index ใช้รูปแบบเดียวกับ customize popup: theme 1–8, skin 1–3
 */
require __DIR__ . '/_common.php';

const LOBBY_THEME_MIN = 1;
const LOBBY_THEME_MAX = 8;
const LOBBY_SKIN_MIN = 1;
const LOBBY_SKIN_MAX = 3;

function valid_player_key(string $key): bool
{
    return (bool)preg_match('/^[a-zA-Z0-9_-]{8,128}$/', $key);
}

/** คืน index ที่อยู่ในช่วง หรือ null ถ้าไม่ถูกต้อง */
function clamp_index_or_null($raw, int $min, int $max): ?int
{
    if ($raw === null || $raw === '') {
        return null;
    }
    $v = (int)$raw;
    if ($v < $min || $v > $max) {
        return null;
    }
    return $v;
}

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

if ($method === 'GET') {
    $key = trim((string)($_GET['playerKey'] ?? ''));
    if (!valid_player_key($key)) {
        json_response(['ok' => false, 'error' => 'playerKey ต้องยาว 8–128 (a-z 0-9 _ -)'], 400);
    }

    $store = read_store();
    foreach ($store['accounts'] ?? [] as $a) {
        if (($a['loginType'] ?? '') !== 'guest') {
            continue;
        }
        if (($a['providerUserId'] ?? '') !== $key) {
            continue;
        }
        json_response([
            'ok' => true,
            'colorThemeIndex' => clamp_index_or_null($a['lobbyColorThemeIndex'] ?? null, LOBBY_THEME_MIN, LOBBY_THEME_MAX),
            'skinToneIndex' => clamp_index_or_null($a['lobbySkinToneIndex'] ?? null, LOBBY_SKIN_MIN, LOBBY_SKIN_MAX),
        ]);
    }

    // ยังไม่มีบัญชี/ยังไม่เคยเลือกสี — ไม่ต้องสร้างบัญชีตอน GET
    json_response([
        'ok' => true,
        'colorThemeIndex' => null,
        'skinToneIndex' => null,
    ]);
}

if ($method === 'POST') {
    $body = require_json_body();
    $key = trim((string)($body['playerKey'] ?? ''));
    if (!valid_player_key($key)) {
        json_response(['ok' => false, 'error' => 'playerKey ต้องยาว 8–128 (a-z 0-9 _ -)'], 400);
    }

    $colorThemeIndex = clamp_index_or_null($body['colorThemeIndex'] ?? null, LOBBY_THEME_MIN, LOBBY_THEME_MAX);
    $skinToneIndex = clamp_index_or_null($body['skinToneIndex'] ?? null, LOBBY_SKIN_MIN, LOBBY_SKIN_MAX);
    if ($colorThemeIndex === null && $skinToneIndex === null) {
        json_response(['ok' => false, 'error' => 'ต้องส่ง colorThemeIndex (1–8) หรือ skinToneIndex (1–3) อย่างน้อย 1 ค่า'], 400);
    }

    $store = read_store();
    $now = gmdate('c');
    $found = false;

    foreach ($store['accounts'] as $i => $a) {
        if (($a['loginType'] ?? '') !== 'guest') {
            continue;
        }
        if (($a['providerUserId'] ?? '') !== $key) {
            continue;
        }
        if ($colorThemeIndex !== null) {
            $store['accounts'][$i]['lobbyColorThemeIndex'] = $colorThemeIndex;
        }
        if ($skinToneIndex !== null) {
            $store['accounts'][$i]['lobbySkinToneIndex'] = $skinToneIndex;
        }
        $store['accounts'][$i]['updatedAt'] = $now;
        $found = true;
        break;
    }

    if (!$found) {
        $store['accounts'][] = [
            'id' => new_id(),
            'email' => '',
            'displayName' => 'Guest',
            'loginType' => 'guest',
            'providerUserId' => $key,
            'notes' => 'auto: player-lobby-style',
            'blocked' => false,
            'coins' => 0,
            'lobbyColorThemeIndex' => $colorThemeIndex,
            'lobbySkinToneIndex' => $skinToneIndex,
            'createdAt' => $now,
            'updatedAt' => $now,
        ];
    }

    if (!write_store($store)) {
        json_response(['ok' => false, 'error' => 'บันทึกสีไม่สำเร็จ'], 500);
    }

    json_response([
        'ok' => true,
        'colorThemeIndex' => $colorThemeIndex,
        'skinToneIndex' => $skinToneIndex,
    ]);
}

json_response(['ok' => false, 'error' => 'Use GET or POST'], 405);