/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,

  // Enable compression
  compress: true,

  // Optimize package imports (tree-shake large libraries)
  experimental: {
    optimizePackageImports: ['lucide-react', 'recharts'],
    // Enable instrumentation.ts hook (boots EVE auto-sync cron at startup).
    // This is on by default in Next 15+, but Next 14 needs the opt-in flag.
    instrumentationHook: true,
    // node-cron is a Node-only module — keep it server-side, never bundled
    serverComponentsExternalPackages: ['node-cron'],
  },

  // Image optimization
  images: {
    formats: ['image/avif', 'image/webp'],
  },

  // Cache headers for static assets and API routes
  async headers() {
    return [
      {
        source: '/_next/static/:path*',
        headers: [
          { key: 'Cache-Control', value: 'public, max-age=31536000, immutable' },
        ],
      },
      {
        source: '/api/currencies',
        headers: [
          { key: 'Cache-Control', value: 'private, max-age=3600, stale-while-revalidate=7200' },
        ],
      },
      {
        source: '/api/fiscal-periods',
        headers: [
          { key: 'Cache-Control', value: 'private, max-age=3600, stale-while-revalidate=7200' },
        ],
      },
      {
        source: '/api/accounts',
        headers: [
          { key: 'Cache-Control', value: 'private, max-age=300, stale-while-revalidate=600' },
        ],
      },
    ];
  },
};

module.exports = nextConfig;