export default {
  async email(message, env, ctx) {
    const TELEGRAM_TOKEN = env.TELEGRAM_TOKEN;
    const TELEGRAM_CHAT_ID = env.TELEGRAM_CHAT_ID;

    if (!TELEGRAM_TOKEN || !TELEGRAM_CHAT_ID) {
      return;
    }

    try {
      const from = message.from || "Unknown";
      const to = message.to || "Unknown";
      let subject = message.headers.get("subject") || "(Tanpa Subjek)";
      subject = decodeMimeHeader(subject);

      // Ambil seluruh teks mentah email
      const rawEmail = await new Response(message.raw).text();

      // 1. Tangkap SEMUA tautan HTTPS (termasuk link verifikasi tersembunyi)
      const allLinks = extractRawUrls(rawEmail);

      // 2. Bersihkan teks isi email
      let bodyText = cleanEmailBody(rawEmail);
      if (bodyText.length > 1200) {
        bodyText = bodyText.substring(0, 1200) + "\n\n...(pesan dipotong)";
      }

      // 3. Format Bagian Tautan Verifikasi
      let linkSection = "";
      if (allLinks.length > 0) {
        linkSection = `\n🔗 <b>LINK VERIFIKASI / ACTION (Klik untuk Buka):</b>\n` + 
                      allLinks.map((url, i) => `<b>[Link ${i + 1}]</b> <a href="${url}">${url}</a>`).join("\n\n") + "\n";
      } else {
        linkSection = `\n⚠️ <i>Tidak ada link verifikasi terdeteksi.</i>\n`;
      }

      // 4. Format Pesan HTML Telegram
      const htmlMessage = 
`<b>📩 EMAIL MASUK (Temp Mail)</b>

<b>👤 Dari:</b> <code>${escapeHtml(from)}</code>
<b>📥 Untuk:</b> <code>${escapeHtml(to)}</code>
<b>📌 Subjek:</b> <b>${escapeHtml(subject)}</b>
${linkSection}
<b>📝 Teks Email:</b>
<pre>${escapeHtml(bodyText)}</pre>`;

      // Kirim ke Telegram API
      const url = `https://api.telegram.org/bot${TELEGRAM_TOKEN}/sendMessage`;
      await fetch(url, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          chat_id: TELEGRAM_CHAT_ID,
          text: htmlMessage,
          parse_mode: "HTML",
          disable_web_page_preview: true
        })
      });

    } catch (err) {
      console.error("Error Worker:", err);
    }
  }
};

// --- FUNGSI EKSTRAKSI LINK EXTREME ---
function extractRawUrls(raw) {
  // Decode Quoted-Printable MIME terlebih dahulu (menghapus =3D dan newline =)
  let unquoted = raw.replace(/=\r?\n/g, "").replace(/=3D/gi, "=");
  unquoted = unquoted.replace(/=([0-9A-F]{2})/gi, (_, hex) => String.fromCharCode(parseInt(hex, 16)));

  const urls = [];
  // Regex mencari semua pola URL https://
  const urlRegex = /https?:\/\/[^\s"'<>(){}]+[^\s"'<>(){}\.,;]/gi;
  let match;

  while ((match = urlRegex.exec(unquoted)) !== null) {
    let url = match[0];
    
    // Filter URL sistem/font/schema yang bukan link verifikasi
    const isNoise = url.includes("w3.org") || 
                    url.includes("schema.org") || 
                    url.includes(".png") || 
                    url.includes(".jpg") || 
                    url.includes(".css");

    if (!isNoise && !urls.includes(url)) {
      urls.push(url);
    }
  }
  return urls.slice(0, 5); // Ambil 5 link pertama
}

// --- FUNGSI MEMBERSIHKAN TEKS BODY ---
function cleanEmailBody(raw) {
  let text = raw.replace(/=\r?\n/g, "").replace(/=3D/gi, "=");
  
  // Ambil bagian setelah header utama
  const parts = text.split(/\r?\n\r?\n/);
  if (parts.length > 1) {
    text = parts.slice(1).join("\n\n");
  }

  // Jika ada tag HTML, buang tagnya tetapi sisakan teksnya
  text = text.replace(/<style[^>]*>[\s\S]*?<\/style>/gi, "");
  text = text.replace(/<script[^>]*>[\s\S]*?<\/script>/gi, "");
  text = text.replace(/<[^>]*>?/gm, " ");
  
  // Rapikan spasi berlebih
  text = text.replace(/[ \t]+/g, " ").replace(/\n\s*\n/g, "\n").trim();
  
  return text || "(Isi teks tidak dapat dibaca)";
}

function decodeMimeHeader(header) {
  if (!header) return "";
  return header.replace(/=\?([^?]+)\?([QB])\?([^?]+)\?=/gi, (_, charset, encoding, text) => {
    if (encoding.toUpperCase() === "B") {
      try { return atob(text); } catch (e) { return text; }
    } else if (encoding.toUpperCase() === "Q") {
      return text.replace(/=([0-9A-F]{2})/gi, (_, hex) => String.fromCharCode(parseInt(hex, 16)));
    }
    return text;
  });
}

function escapeHtml(str) {
  return String(str)
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;");
}