import { NextRequest, NextResponse } from "next/server";
import { getUsers } from "@/lib/users";

/**
 * app/api/webhooks/mail/route.ts
 * 
 * Webhook endpoint for incoming mail notifications (e.g. from Rspamd or Mailcow).
 * Sends notifications to Telegram based on the recipient email.
 */

export async function POST(req: NextRequest) {
  try {
    const data = await req.json();
    
    // Extract basic info from the incoming payload
    const recipient = (data.to || data.rcpt || "").toLowerCase();
    const sender = data.from || "Bilinmiyor";
    const subject = data.subject || "(Konu Yok)";
    
    console.log(`[Mail Webhook] Yeni mail geldi: ${sender} -> ${recipient}`);

    const users = getUsers();
    const user = users.find(u => u.email.toLowerCase() === recipient);
    const targetChatId = user?.telegramId;

    if (targetChatId && process.env.TELEGRAM_BOT_TOKEN) {
      const message = `🔔 *Yeni Mail!*\n\n*Kimden:* ${sender}\n*Konu:* ${subject}`;
      
      const telegramUrl = `https://api.telegram.org/bot${process.env.TELEGRAM_BOT_TOKEN}/sendMessage`;
      
      const res = await fetch(telegramUrl, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          chat_id: targetChatId,
          text: message,
          parse_mode: "Markdown",
        }),
      });

      if (!res.ok) {
        const errorText = await res.text();
        console.error(`[Mail Webhook] Telegram API hatası: ${res.status} ${errorText}`);
      } else {
        console.log(`[Mail Webhook] Telegram bildirimi gönderildi: ${recipient}`);
      }
    } else {
      if (!targetChatId) {
        console.log(`[Mail Webhook] Alıcı için eşleşen Telegram ID bulunamadı: ${recipient}`);
      }
      if (!process.env.TELEGRAM_BOT_TOKEN) {
        console.error("[Mail Webhook] TELEGRAM_BOT_TOKEN ayarlı değil!");
      }
    }

    return NextResponse.json({ status: "ok" });
  } catch (error: any) {
    console.error(`[Mail Webhook] Hata: ${error.message}`);
    return NextResponse.json({ error: "İşlem başarısız" }, { status: 500 });
  }
}