import { NextRequest, NextResponse } from 'next/server';
import { getSession } from '@/lib/auth';

export async function GET(request: NextRequest) {
  const session = await getSession(request.cookies.get('scriba.access_token')?.value);
  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

  const clientId = process.env.GITLAB_CLIENT_ID;
  if (!clientId) return NextResponse.json({ error: 'GitLab OAuth not configured' }, { status: 500 });

  const appUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
  const redirectUri = `${appUrl}/api/auth/gitlab/callback`;

  const params = new URLSearchParams({
    client_id: clientId,
    redirect_uri: redirectUri,
    response_type: 'code',
    scope: 'read_user read_api read_repository',
    state: session.user.id,
  });

  return NextResponse.redirect(`https://gitlab.com/oauth/authorize?${params}`);
}