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

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  const { id } = await params;
  
  try {
    const response = await fetch(
      `https://www.googletagmanager.com/gtag/js?id=${id}`,
      {
        headers: {
          'User-Agent': request.headers.get('user-agent') || '',
        },
      }
    );

    if (!response.ok) {
      return new NextResponse('Script not found', { status: 404 });
    }

    const scriptContent = await response.text();
    
    // Modificar URLs internas do script para usar o proxy
    const modifiedScript = scriptContent
      .replace(
        /https?:\/\/[^\/]*google-analytics\.com\/g\/collect/g,
        '/api/metrics'
      )
      .replace(
        /https?:\/\/[^\/]*google-analytics\.com/g,
        '/api/metrics'
      );

    return new NextResponse(modifiedScript, {
      status: 200,
      headers: {
        'Content-Type': 'application/javascript',
        'Cache-Control': 'public, max-age=3600',
      },
    });
  } catch (error) {
    console.error('GTM proxy error:', error);
    return new NextResponse('Proxy error', { status: 500 });
  }
}