import { NextResponse } from 'next/server';
import { google } from 'googleapis';
import { getServerSession } from 'next-auth';
import { authOptions } from '../auth/[...nextauth]/route';

async function listCSVFileNames(accessToken: string): Promise<string[]> {
  const auth = new google.auth.OAuth2();
  console.log(accessToken)
  auth.setCredentials({ access_token: accessToken });

  const drive = google.drive({ version: 'v3', auth });

  try {
    const res = await drive.files.list({
      q: "mimeType='text/csv'",
      fields: 'files(name)',
    });

    const fileNames = res.data.files?.map(file => file.name) || [];
    
    return fileNames
  } catch (error) {
    console.error('Error listing CSV files:', error);
    throw new Error('Failed to list CSV files');
  }
}

export async function GET(request: Request) {
  try {
    const session = await getServerSession({ req: request, authOptions });
    

    if (!session || !session.accessToken) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const fileNames = await listCSVFileNames(session.accessToken);
    return NextResponse.json({ fileNames });
  } catch (error) {
    return NextResponse.json({ error: error.message }, { status: 500 });
  }
}