import createMiddleware from 'next-intl/middleware';
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { getServerAppServices } from '@/lib/services/create-services.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'
});

// Main middleware that logs all requests
export default function middleware(request: NextRequest) {
  const startTime = Date.now();
  const { method, url, headers } = request;
  const userAgent = headers.get('user-agent') || 'unknown';
  const referer = headers.get('referer') || 'none';
  const ip = headers.get('x-forwarded-for') || headers.get('x-real-ip') || 'unknown';

  // Get logger service
  const services = getServerAppServices();
  const logger = services.logger.child({ middleware: 'request-logger' });

  // Log incoming request
  logger.info(`Incoming request: method=${method} url=${url} ip=${ip} ua="${userAgent.slice(0,60)}${userAgent.length>60 ? '...' : ''}" ref="${referer.slice(0,80)}${referer.length>80 ? '...' : ''}"`);

  try {
    // Apply internationalization middleware
    const response = intlMiddleware(request);
    const duration = Date.now() - startTime;

    // Log successful response
    if (response.status >= 300 && response.status < 400) {
      const location = response.headers.get('location') || 'unknown';
      logger.info(`Redirect detected: status=${response.status} location="${location.slice(0,100)}${location.length>100?'...':''}" method=${method} url=${url} duration=${duration}ms ip=${ip} ua="${userAgent.slice(0,60)}${userAgent.length>60?'...':''}" ref="${referer.slice(0,80)}${referer.length>80?'...':''}"`);
    } else {
      logger.info(`Request completed: status=${response.status} method=${method} url=${url} duration=${duration}ms ip=${ip} ua="${userAgent.slice(0,60)}${userAgent.length>60?'...':''}" ref="${referer.slice(0,80)}${referer.length>80?'...':''}"`);
    }

    return response;
  } catch (error) {
    const duration = Date.now() - startTime;
    
    // Log error
    const errorMsg = error instanceof Error ? error.message : String(error);
    logger.error(`Request failed: method=${method} url=${url} duration=${duration}ms error="${errorMsg}" ip=${ip} ua="${userAgent.slice(0,60)}${userAgent.length>60?'...':''}" ref="${referer.slice(0,80)}${referer.length>80?'...':''}"`);

    // Re-throw the error to let Next.js handle it
    throw error;
  }
}

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