import { NextResponse, NextRequest } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/app/api/auth/[...nextauth]/route';

export async function GET(req: NextRequest) {
  try {
    const session = await getServerSession(authOptions);

    if (!session?.user?.email) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const nextcloudUrl = process.env.NEXTCLOUD_URL;
    const clientId = process.env.NEXTCLOUD_CLIENT_ID;
    const clientSecret = process.env.NEXTCLOUD_CLIENT_SECRET;

    if (!nextcloudUrl || !clientId || !clientSecret) {
      console.error('Missing Nextcloud configuration');
      return NextResponse.json(
        { error: 'Nextcloud configuration is missing' },
        { status: 500 }
      );
    }

    // First, get a Nextcloud OIDC token using client credentials
    const tokenResponse = await fetch(`${nextcloudUrl}/index.php/apps/oauth2/api/v1/token`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Authorization': `Basic ${Buffer.from(`${clientId}:${clientSecret}`).toString('base64')}`,
      },
      body: new URLSearchParams({
        grant_type: 'client_credentials',
        scope: 'ocs',
      }),
    });

    if (!tokenResponse.ok) {
      console.error('Failed to get Nextcloud token:', {
        status: tokenResponse.status,
        statusText: tokenResponse.statusText,
      });
      return NextResponse.json({ error: 'Nextcloud authentication failed' }, { status: 401 });
    }

    const { access_token } = await tokenResponse.json();

    // Now try to access the Mail app using the Nextcloud token
    const response = await fetch(`${nextcloudUrl}/ocs/v2.php/apps/mail/api/v1/accounts`, {
      headers: {
        'Authorization': `Bearer ${access_token}`,
        'Accept': 'application/json',
        'OCS-APIRequest': 'true',
        'Content-Type': 'application/json',
        'X-Requested-With': 'XMLHttpRequest',
      },
    });

    if (!response.ok) {
      console.error('Mail app check failed:', {
        status: response.status,
        statusText: response.statusText,
        url: response.url,
      });
      
      if (response.status === 401) {
        return NextResponse.json({ error: 'Nextcloud authentication failed' }, { status: 401 });
      }
      
      return NextResponse.json(
        { error: "L'application Mail n'est pas disponible sur Nextcloud. Veuillez contacter votre administrateur." },
        { status: 404 }
      );
    }

    const data = await response.json();
    const accounts = data?.ocs?.data || [];
    
    // For now, return a success response with an empty array
    return NextResponse.json([]);
  } catch (error) {
    console.error('Error checking Mail app:', error);
    return NextResponse.json(
      { error: "L'application Mail n'est pas disponible sur Nextcloud. Veuillez contacter votre administrateur." },
      { status: 404 }
    );
  }
}