export type TelegramUpdate = Record<string, any>;

export function telegramApiBase() {
  return process.env.TELEGRAM_API_BASE || "https://api.telegram.org";
}

export function requireTelegramBotToken() {
  const token = process.env.TELEGRAM_BOT_TOKEN;
  if (!token) throw new Error("TELEGRAM_BOT_TOKEN is required");
  return token;
}

export async function telegramBotApi<T>(method: string, body: unknown): Promise<T> {
  const token = requireTelegramBotToken();
  const res = await fetch(`${telegramApiBase()}/bot${token}/${method}`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify(body),
  });

  const json = (await res.json().catch(() => null)) as any;
  if (!res.ok || !json?.ok) {
    const desc = json?.description || `HTTP ${res.status}`;
    throw new Error(`Telegram API ${method} failed: ${desc}`);
  }

  return json.result as T;
}