<?php
declare(strict_types=1);

/**
 * แอดมินเท่านั้น — จัดการกระดานผู้นำ (High Score)
 * GET                          → รายชื่อบัญชีเรียงตามคะแนนสะสม (มาก→น้อย)
 * POST { action: 'resetAll' }  → ล้างคะแนนทุกคนเป็น 0
 * POST { action: 'reset', id } → ล้างคะแนนคนเดียวเป็น 0
 * (การตั้งคะแนนรายคน ใช้ accounts.php PATCH { id, score })
 */
require __DIR__ . '/_common.php';
require_login();

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

if ($method === 'GET') {
    $store = read_store();
    $rows = [];
    foreach (($store['accounts'] ?? []) as $a) {
        $score = max(0, (int) ($a['score'] ?? 0));
        $name = trim((string) ($a['lbName'] ?? ''));
        if ($name === '') $name = trim((string) ($a['displayName'] ?? ''));
        if ($name === '') $name = 'ผู้เล่น';
        $rows[] = [
            'id' => (string) ($a['id'] ?? ''),
            'name' => $name,
            'score' => $score,
            'coins' => max(0, (int) ($a['coins'] ?? 0)),
            'blocked' => !empty($a['blocked']),
            'loginType' => (string) ($a['loginType'] ?? ''),
            'key' => (string) ($a['providerUserId'] ?? ''),
        ];
    }
    usort($rows, function ($x, $y) {
        if ($y['score'] !== $x['score']) {
            return $y['score'] - $x['score'];
        }
        return strcmp((string) $x['name'], (string) $y['name']);
    });
    foreach ($rows as $i => &$r) {
        $r['rank'] = $i + 1;
    }
    unset($r);
    json_response(['ok' => true, 'rows' => $rows, 'total' => count($rows)]);
}

if ($method === 'POST') {
    $body = require_json_body();
    $action = (string) ($body['action'] ?? '');

    if ($action === 'resetAll') {
        $store = read_store();
        $n = 0;
        foreach (($store['accounts'] ?? []) as $i => $a) {
            if ((int) ($a['score'] ?? 0) !== 0) {
                $store['accounts'][$i]['score'] = 0;
                $store['accounts'][$i]['updatedAt'] = gmdate('c');
                $n++;
            }
        }
        if (!write_store($store)) {
            json_response(['ok' => false, 'error' => 'บันทึกไม่สำเร็จ'], 500);
        }
        json_response(['ok' => true, 'reset' => $n]);
    }

    if ($action === 'reset') {
        $id = trim((string) ($body['id'] ?? ''));
        if ($id === '') {
            json_response(['ok' => false, 'error' => 'ระบุ id'], 400);
        }
        $store = read_store();
        $found = false;
        foreach (($store['accounts'] ?? []) as $i => $a) {
            if (($a['id'] ?? '') === $id) {
                $store['accounts'][$i]['score'] = 0;
                $store['accounts'][$i]['updatedAt'] = gmdate('c');
                $found = true;
                break;
            }
        }
        if (!$found) {
            json_response(['ok' => false, 'error' => 'ไม่พบบัญชี'], 404);
        }
        if (!write_store($store)) {
            json_response(['ok' => false, 'error' => 'บันทึกไม่สำเร็จ'], 500);
        }
        json_response(['ok' => true]);
    }

    json_response(['ok' => false, 'error' => 'action ไม่ถูกต้อง'], 400);
}

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