import createMiddleware from 'next-intl/middleware';
import { NextResponse, NextRequest } from 'next/server';

// Create the internationalization middleware
const intlMiddleware = createMiddleware({
  // A list of all locales that are supported
  locales: ['en', 'de'],

  // Used when no locale matches
  defaultLocale: 'en',
});

export default function middleware(request: NextRequest) {
  const { method, url, headers } = request;

  // Build header object for logging
  const headerObj: Record<string, string> = {};
  headers.forEach((value, key) => {
    headerObj[key] = value;
  });

  // Defensive URL correction
  // If the URL contains 0.0.0.0 (internal IP), we rebuild it using the Host header
  let effectiveRequest = request;
  if (url.includes('0.0.0.0')) {
    const proto = headers.get('x-forwarded-proto') || 'https';
    const host = headers.get('host') || 'testing.klz-cables.com';
    const newUrl = new URL(url);
    newUrl.protocol = proto;
    newUrl.host = host;
    effectiveRequest = new NextRequest(newUrl, {
      headers: request.headers,
      method: request.method,
      body: request.body,
    });
    console.log(
      `Replaced 0.0.0.0 URL with: ${newUrl.toString()} | Original Host: ${headers.get('host')} | Headers: ${JSON.stringify(headerObj)}`,
    );
  }

  try {
    // Apply internationalization middleware
    const response = intlMiddleware(effectiveRequest);
    return response;
  } catch (error) {
    console.error(
      `Request failed: method=${method} url=${url} headers=${JSON.stringify(headerObj)}`,
      error,
    );
    throw error;
  }
}

export const config = {
  // Match only internationalized pathnames
  matcher: ['/((?!api|_next|_vercel|health|.*\\..*).*)', '/', '/(de|en)/:path*'],
};