// Cloudflare Pages Functions
// file path: functions/api/notify.js
export async function onRequestPost(context) {
  const { request, env } = context;

  let body;
  try {
    body = await request.json();
  } catch {
    return new Response('bad json', { status: 400 });
  }

  const text = (body && body.text) ? String(body.text) : '';
  if (!text) return new Response('missing text', { status: 400 });

  const token = env.TELEGRAM_BOT_TOKEN;
  const chatId = env.TELEGRAM_CHAT_ID;

  if (!token || !chatId) return new Response('missing telegram env', { status: 500 });

  const url = `https://api.telegram.org/bot${token}/sendMessage`;
  const payload = {
    chat_id: chatId,
    text,
    disable_web_page_preview: true
  };

  const resp = await fetch(url, {
    method: 'POST',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify(payload)
  });

  if (!resp.ok) {
    const t = await resp.text().catch(() => '');
    return new Response(`telegram error: ${resp.status} ${t}`.slice(0, 800), { status: 502 });
  }

  return new Response('ok', { status: 200 });
}