/** @type {import('next').NextConfig} */
const nextConfig = {
  // Enable standalone output for Docker
  output: 'standalone',

  // API Proxy to FastAPI backend
  async rewrites() {
    const apiUrl = process.env.FASTAPI_URL || 'http://localhost:8000/api';
    return [
      {
        source: '/api/:path*',
        destination: `${apiUrl}/:path*`,
      },
    ];
  },

  // Image optimization
  images: {
    remotePatterns: [
      { protocol: 'https', hostname: '*.tile.openstreetmap.org' },
      { protocol: 'https', hostname: 'tile.openstreetmap.org' },
      { protocol: 'https', hostname: 'cdnjs.cloudflare.com' },
    ],
    formats: ['image/avif', 'image/webp'],
    minimumCacheTTL: 60,
  },

  // Performance optimizations
  compiler: {
    // Remove console logs in production
    removeConsole: process.env.NODE_ENV === 'production',
  },

  // Compression
  compress: true,

  // React strict mode for better error detection
  reactStrictMode: true,

  // Power optimizations
  poweredByHeader: false,

  // Production source maps (disable for smaller bundles)
  productionBrowserSourceMaps: false,

  // Experimental features for performance
  experimental: {
    // Optimize package imports
    optimizePackageImports: ['chart.js', 'react-chartjs-2', 'leaflet'],
  },

  // Headers for caching and security
  async headers() {
    return [
      {
        source: '/:path*',
        headers: [
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on',
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN',
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff',
          },
          {
            key: 'Referrer-Policy',
            value: 'origin-when-cross-origin',
          },
        ],
      },
      {
        source: '/favicon.svg',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=31536000, immutable',
          },
        ],
      },
    ];
  },
};

module.exports = nextConfig;