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');
    }

    // Remove trailing slash if present
    const normalizedBaseURL = baseURL.endsWith('/') ? baseURL.slice(0, -1) : baseURL;
    
    // Construct the full WebDAV URL
    const webdavURL = `${normalizedBaseURL}/remote.php/dav`;
    console.log('WebDAV base URL:', webdavURL);
    
    const client = createClient(webdavURL, {
      username: credentials.username,
      password: credentials.password,
      authType: 'password',
    });

    try {
      // List files in the specified folder
      const path = `/files/${credentials.username}/Private/${folder}`;
      console.log('Fetching contents from path:', path);
      
      const files = await client.getDirectoryContents(path);
      console.log('Raw files response:', JSON.stringify(files, null, 2));

      // Filter for .md files and format the response
      const markdownFiles = files
        .filter((file: any) => {
          const isMarkdown = file.basename.endsWith('.md');
          console.log(`File: ${file.basename}, isMarkdown: ${isMarkdown}`);
          return isMarkdown;
        })
        .map((file: any) => {
          const fileData = {
            id: file.filename,
            title: file.basename.replace('.md', ''),
            lastModified: new Date(file.lastmod).toISOString(),
            size: file.size,
            type: 'file',
            mime: file.mime,
            etag: file.etag
          };
          console.log('Formatted file data:', JSON.stringify(fileData, null, 2));
          return fileData;
        });

      console.log('Found markdown files:', markdownFiles.length);
      console.log('Final response:', JSON.stringify(markdownFiles, null, 2));
      return NextResponse.json(markdownFiles);
    } catch (error) {
      console.error('Error listing directory contents:', error);
      if (error instanceof Error) {
        console.error('Error details:', error.message);
        console.error('Error stack:', error.stack);
      }
      return NextResponse.json({ error: 'Failed to list directory contents' }, { status: 500 });
    }
  } catch (error) {
    console.error('Error fetching files:', error);
    if (error instanceof Error) {
      console.error('Error details:', error.message);
      console.error('Error stack:', error.stack);
    }
    return NextResponse.json({ error: 'Failed to fetch files' }, { status: 500 });
  }
}