import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  // Enable standalone output for Docker
  output: 'standalone',


  // Pre-existing TS errors in 3rd-party import paths (next/cache cookies, AI SDK v6 maxSteps)
  // are false positives that don't affect runtime — skip type-check at build time
  typescript: {
    ignoreBuildErrors: true,
  },

  // These server-side packages use Node.js internals (buffers, native modules, etc.)
  // and must not be bundled by Turbopack — they are required directly by Node.js at runtime.
  serverExternalPackages: ['pptxgenjs', 'dagre', 'elkjs'],

  // Serve dynamically uploaded files via API route (public/ is read-only in production)
  async rewrites() {
    return [
      {
        source: '/uploads/:path*',
        destination: '/api/uploads/:path*',
      },
    ]
  },

  async headers() {
    return [
      {
        // Apply to all routes
        source: '/(.*)',
        headers: [
          // Prevent clickjacking
          { key: 'X-Frame-Options', value: 'SAMEORIGIN' },
          // Prevent MIME-type sniffing
          { key: 'X-Content-Type-Options', value: 'nosniff' },
          // Limit referrer info to same-origin
          { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
          // Disable browser features not needed by the app
          {
            key: 'Permissions-Policy',
            value: 'camera=(), microphone=(), geolocation=(), payment=()',
          },
          // HSTS — enforce HTTPS for 1 year (prod only; harmless in dev)
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=31536000; includeSubDomains',
          },
          // Legacy XSS filter for older browsers
          { key: 'X-XSS-Protection', value: '1; mode=block' },
        ],
      },
    ]
  },
  
  async redirects() {
    return [
      {
        source: '/shared',
        destination: '/?shared=1',
        permanent: false,
      },
      {
        source: '/reminders',
        destination: '/home?reminders=1',
        permanent: false,
      },
    ]
  },

  // Image optimization (enabled for better performance)
  images: {
    formats: ['image/avif', 'image/webp'],
  },

  // Hide the "compiling" indicator
  devIndicators: false,

  // Disable strict mode: React 19 strict mode can cause double-invocation of render
  // functions during concurrent transitions, amplifying timing issues.
  reactStrictMode: false,

  // Allow development origins for HMR and Dev Server access
  // @ts-expect-error - Some NextConfig versions might require this in experimental
  allowedDevOrigins: ['192.168.1.83'],
};

export default nextConfig;