import { NextResponse } from 'next/server';
import { ImapFlow } from 'imapflow';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/app/api/auth/[...nextauth]/route';
import { prisma } from '@/lib/prisma';

export async function GET(request: Request, { params }: { params: { id: string } }) {
  try {
    const session = await getServerSession(authOptions);
    if (!session?.user?.id) {
      return NextResponse.json(
        { error: 'Unauthorized' },
        { status: 401 }
      );
    }

    // Get credentials from database
    const credentials = await prisma.mailCredentials.findUnique({
      where: {
        userId: session.user.id
      }
    });

    if (!credentials) {
      return NextResponse.json(
        { error: 'No mail credentials found. Please configure your email account.' },
        { status: 401 }
      );
    }

    // Get the current folder from the request URL
    const url = new URL(request.url);
    const folder = url.searchParams.get('folder') || 'INBOX';

    // Connect to IMAP server
    const client = new ImapFlow({
      host: credentials.host,
      port: credentials.port,
      secure: true,
      auth: {
        user: credentials.email,
        pass: credentials.password,
      },
      logger: false,
      emitLogs: false,
      tls: {
        rejectUnauthorized: false
      }
    });

    try {
      await client.connect();
      await client.mailboxOpen(folder);
      
      // Fetch the full email content
      const message = await client.fetchOne(params.id, {
        source: true,
        envelope: true,
        flags: true
      });

      if (!message) {
        return NextResponse.json(
          { error: 'Email not found' },
          { status: 404 }
        );
      }

      // Extract email content
      const result = {
        id: message.uid.toString(),
        from: message.envelope.from[0].address,
        subject: message.envelope.subject || '(No subject)',
        date: message.envelope.date.toISOString(),
        read: message.flags.has('\\Seen'),
        starred: message.flags.has('\\Flagged'),
        folder: folder,
        body: message.source.toString(),
        to: message.envelope.to?.map(addr => addr.address).join(', ') || '',
        cc: message.envelope.cc?.map(addr => addr.address).join(', ') || '',
        bcc: message.envelope.bcc?.map(addr => addr.address).join(', ') || '',
      };

      return NextResponse.json(result);
    } finally {
      try {
        await client.logout();
      } catch (e) {
        console.error('Error during logout:', e);
      }
    }
  } catch (error) {
    console.error('Error fetching email:', error);
    return NextResponse.json(
      { error: 'An unexpected error occurred' },
      { status: 500 }
    );
  }
}