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

/**
 * PRODUCTION STABILIZATION MIDDLEWARE
 * This middleware handles legacy asset routing for the KLZ showcase,
 * ensuring assets are correctly mapped regardless of Next.js config wrapper behavior.
 */
export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;


  // 2. Legacy Showcase Asset Mapping
  // Handles:
  // - Global assets (/wp-content/*, /wp-includes/*, /assets/*)
  // - Showcase-specific resources (/case-studies/klz-cables/index.html, etc.)
  
  // Normalize pathname to ensure we're matching correctly
  const path = pathname;

  // Map Pattern 2: Showcase-prefixed assets (used for relative links within the showcase)
  const showcaseMatch = path.match(/^\/(?:case-studies|work|blog)\/([^\/]+)\/(.*)/);
  if (showcaseMatch) {
    const [, slug, remainingPath] = showcaseMatch;
    
    // Safety: Only rewrite if it looks like a static asset (has extension) 
    // or belongs to known legacy folders. This prevents catching Next.js routes.
    if (remainingPath.match(/\.(?:html|php|js|css|png|jpg|jpeg|svg|gif|webp|woff2?|ttf|pdf|json|xml)$/) || 
        remainingPath.includes('wp-content/') || 
        remainingPath.includes('wp-includes/') || 
        remainingPath.includes('assets/')) {
      
      // Normalize slug: klz-cables -> klz-cables.com (literal folder name)
      const directory = slug === 'klz-cables' ? 'klz-cables.com' : slug;
      
      // If the remaining path already starts with assets/directory, don't double it
      const targetPath = remainingPath.startsWith(`assets/${directory}/`) 
        ? `/${remainingPath}` 
        : `/${remainingPath}`;
        
      return NextResponse.rewrite(new URL(`/showcase/${directory}${targetPath}`, request.url));
    }
  }

  return NextResponse.next();
}

// Optimization: Only run middleware for legacy asset paths to minimize overhead
export const config = {
  matcher: [
    '/wp-content/:path*',
    '/wp-includes/:path*',
    '/assets/:path*',
    '/case-studies/:path*',
    '/work/:path*',
    '/blog/:path*',
  ],
};