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

export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;

  if (pathname.startsWith('/api/auth')) {
    return NextResponse.next();
  }

  if (pathname.startsWith('/api/admin')) {
    return NextResponse.next();
  }

  if (pathname.startsWith('/api/content')) {
    return NextResponse.next();
  }

  const legacyApiPaths = [
    '/api/config',
    '/api/health',
  ];

  const isLegacyApi = legacyApiPaths.some(path => 
    pathname.startsWith(path) && !pathname.includes('/v1/') && !pathname.includes('/v2/')
  );

  if (isLegacyApi) {
    const url = request.nextUrl.clone();
    url.pathname = pathname.replace('/api/', '/api/v1/');
    
    return NextResponse.rewrite(url);
  }

  if (pathname.startsWith('/api/docs') || pathname === '/api-docs') {
    const response = NextResponse.next();
    response.headers.set('X-API-Version', 'none');
    return response;
  }

  const versionMatch = pathname.match(/\/api\/v(\d+)\//);
  if (versionMatch) {
    const response = NextResponse.next();
    response.headers.set('X-API-Version', `v${versionMatch[1]}`);
    return response;
  }

  return NextResponse.next();
}

export const config = {
  matcher: '/api/:path*',
};