};

const TELEGRAM_GENERAL_TOPIC_ID = 1;

const telegramForumFlagByChatId = new Map<string, boolean>();

const TELEGRAM_FORUM_FLAG_CACHE_MAX_CHATS = 1024;

const TELEGRAM_FORUM_FLAG_CACHE_TTL_MS = 10 * 60_000;

const telegramForumFlagByChatId = new Map<string, { expiresAtMs: number; isForum: boolean }>();

function cacheTelegramForumFlag(chatId: string | number, isForum: boolean, nowMs = Date.now()) {

const cacheKey = String(chatId);

if (

!telegramForumFlagByChatId.has(cacheKey) &&

telegramForumFlagByChatId.size >= TELEGRAM_FORUM_FLAG_CACHE_MAX_CHATS

) {

const oldestKey = telegramForumFlagByChatId.keys().next().value;

if (oldestKey !== undefined) {

telegramForumFlagByChatId.delete(oldestKey);

}

}

telegramForumFlagByChatId.set(cacheKey, {

expiresAtMs: nowMs + TELEGRAM_FORUM_FLAG_CACHE_TTL_MS,

isForum,

});

}

function hadUnsafeTelegramText(raw: unknown, sanitized: string): boolean {

return typeof raw === "string" && raw.trim().length > 0 && sanitized.trim().length === 0;

getChat?: TelegramGetChat;

}): Promise<boolean> {

if (typeof params.isForum === "boolean") {

if (params.isGroup && params.chatType === "supergroup") {

cacheTelegramForumFlag(params.chatId, params.isForum);

}

return params.isForum;

}

if (!params.isGroup || params.chatType !== "supergroup" || !params.getChat) {

return false;

}

const cacheKey = String(params.chatId);

const nowMs = Date.now();

const cached = telegramForumFlagByChatId.get(cacheKey);

if (cached !== undefined) {

return cached;

if (cached && cached.expiresAtMs > nowMs) {

return cached.isForum;

}

if (cached) {

telegramForumFlagByChatId.delete(cacheKey);

}

try {

const resolved = extractTelegramForumFlag(await params.getChat(params.chatId)) === true;

telegramForumFlagByChatId.set(cacheKey, resolved);

cacheTelegramForumFlag(params.chatId, resolved, nowMs);

return resolved;

} catch {

return false;