import { NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { PrismaClient } from '@prisma/client';
import { authOptions } from '@/app/api/auth/[...nextauth]/route';
import { createClient } from 'webdav';

// Use a single PrismaClient instance
declare global {
  var prisma: PrismaClient | undefined;
}

const prisma = global.prisma || new PrismaClient();
if (process.env.NODE_ENV !== 'production') global.prisma = prisma;

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

    const { searchParams } = new URL(request.url);
    const folder = searchParams.get('folder') || 'Notes';

    // Get WebDAV credentials
    const credentials = await prisma.webDAVCredentials.findUnique({
      where: { userId: session.user.id },
    });

    if (!credentials) {
      console.error('No WebDAV credentials found for user:', session.user.id);
      return NextResponse.json({ error: 'No WebDAV credentials found' }, { status: 404 });
    }

    console.log('Using credentials for user:', credentials.username);
    console.log('Accessing folder:', folder);

    // Initialize WebDAV client with proper URL construction
    const baseURL = process.env.NEXTCLOUD_URL;
    if (!baseURL) {
      throw new Error('NEXTCLOUD_URL environment variable is not set');
    }

    // Ensure baseURL ends with a slash
    const normalizedBaseURL = baseURL.endsWith('/') ? baseURL : `${baseURL}/`;
    
    const client = createClient({
      username: credentials.username,
      password: credentials.password,
      baseURL: normalizedBaseURL,
    });

    // Construct the folder path without leading slash
    const folderPath = `remote.php/dav/files/${credentials.username}/Private/${folder}`;
    console.log('Full folder path:', folderPath);

    // List files in the specified folder
    const files = await client.getDirectoryContents(folderPath);
    console.log('Found files:', files.length);

    // Filter for .md files and format the response
    const markdownFiles = files
      .filter((file: any) => file.basename.endsWith('.md'))
      .map((file: any) => ({
        id: file.filename,
        title: file.basename.replace('.md', ''),
        lastModified: new Date(file.lastmod).toISOString(),
        size: file.size,
      }));

    return NextResponse.json(markdownFiles);
  } catch (error) {
    console.error('Error fetching files:', error);
    return NextResponse.json({ error: 'Failed to fetch files' }, { status: 500 });
  }
}