import { NextRequest, NextResponse } from 'next/server';

// This catch-all API route proxies all /api/* requests to the backend
export async function GET(
  request: NextRequest,
  { params }: { params: { path: string[] } }
) {
  return proxyToBackend(request, params.path);
}

export async function POST(
  request: NextRequest,
  { params }: { params: { path: string[] } }
) {
  return proxyToBackend(request, params.path);
}

export async function PUT(
  request: NextRequest,
  { params }: { params: { path: string[] } }
) {
  return proxyToBackend(request, params.path);
}

export async function DELETE(
  request: NextRequest,
  { params }: { params: { path: string[] } }
) {
  return proxyToBackend(request, params.path);
}

async function proxyToBackend(request: NextRequest, pathSegments: string[]) {
  const path = pathSegments.join('/');
  const backendUrl = `http://backend:3001/api/${path}`;
  
  // Get the search params from the original request
  const searchParams = request.nextUrl.searchParams.toString();
  const url = searchParams ? `${backendUrl}?${searchParams}` : backendUrl;

  try {
    // Forward the request to the backend
    const headers: HeadersInit = {};
    
    // Copy relevant headers
    request.headers.forEach((value, key) => {
      if (!key.startsWith('host') && !key.startsWith('connection')) {
        headers[key] = value;
      }
    });

    const options: RequestInit = {
      method: request.method,
      headers,
    };

    // Add body for POST, PUT, PATCH requests
    if (['POST', 'PUT', 'PATCH'].includes(request.method)) {
      const contentType = request.headers.get('content-type');
      if (contentType?.includes('application/json')) {
        options.body = JSON.stringify(await request.json());
      } else if (contentType?.includes('multipart/form-data')) {
        options.body = await request.formData();
      } else {
        options.body = await request.text();
      }
    }

    const response = await fetch(url, options);
    
    // Get response body
    const data = await response.text();
    
    // Return response with same status and headers
    return new NextResponse(data, {
      status: response.status,
      headers: {
        'Content-Type': response.headers.get('content-type') || 'application/json',
      },
    });
  } catch (error) {
    console.error('Proxy error:', error);
    return NextResponse.json(
      { success: false, message: 'Failed to connect to backend' },
      { status: 500 }
    );
  }
}