<?php
declare(strict_types=1);

require __DIR__ . '/_common.php';

require_login();

const ROOM_RETENTION_MIN_DAYS = 3;
const ROOM_RETENTION_MAX_DAYS = 7;
const GAME_SYSTEM_SETTINGS = __DIR__ . '/../../Game/data/system-settings.json';

function clamp_room_retention_days($value): int
{
    $n = (int)$value;
    if ($n < ROOM_RETENTION_MIN_DAYS) {
        return ROOM_RETENTION_MIN_DAYS;
    }
    if ($n > ROOM_RETENTION_MAX_DAYS) {
        return ROOM_RETENTION_MAX_DAYS;
    }
    return $n;
}

function system_settings_payload(array $store): array
{
    $settings = $store['systemSettings'] ?? [];
    return [
        'roomRetentionDays' => clamp_room_retention_days($settings['roomRetentionDays'] ?? ROOM_RETENTION_MIN_DAYS),
        'minRoomRetentionDays' => ROOM_RETENTION_MIN_DAYS,
        'maxRoomRetentionDays' => ROOM_RETENTION_MAX_DAYS,
    ];
}

function sync_game_system_settings(array $payload): bool
{
    $dir = dirname(GAME_SYSTEM_SETTINGS);
    if (!is_dir($dir) && !@mkdir($dir, 0755, true)) {
        return false;
    }
    $data = [
        'roomRetentionDays' => $payload['roomRetentionDays'],
        'updatedAt' => gmdate('c'),
    ];
    $json = json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    return $json !== false && file_put_contents(GAME_SYSTEM_SETTINGS, $json, LOCK_EX) !== false;
}

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

if ($method === 'GET') {
    $store = read_store();
    $payload = system_settings_payload($store);
    sync_game_system_settings($payload);
    json_response(['ok' => true] + $payload);
}

if ($method === 'PATCH' || $method === 'PUT' || $method === 'POST') {
    $body = require_json_body();
    if (!array_key_exists('roomRetentionDays', $body)) {
        json_response(['ok' => false, 'error' => 'กรุณาระบุจำนวนวันจัดเก็บห้อง'], 400);
    }
    $store = read_store();
    $store['systemSettings'] = $store['systemSettings'] ?? [];
    $store['systemSettings']['roomRetentionDays'] = clamp_room_retention_days($body['roomRetentionDays']);
    if (!write_store($store)) {
        json_response(['ok' => false, 'error' => 'บันทึกการตั้งค่าไม่สำเร็จ'], 500);
    }
    $payload = system_settings_payload($store);
    if (!sync_game_system_settings($payload)) {
        json_response(['ok' => false, 'error' => 'บันทึกค่าไปยัง Game/data ไม่สำเร็จ'], 500);
    }
    json_response(['ok' => true] + $payload);
}

json_response(['ok' => false, 'error' => 'Method not allowed'], 405);