import type { NextConfig } from 'next';

const contentSecurityPolicy = [
  "default-src 'self'",
  "base-uri 'none'",
  "frame-ancestors 'none'",
  "object-src 'none'",
  "script-src 'self' 'unsafe-inline'",
  "style-src 'self' 'unsafe-inline'",
  "img-src 'self' data: blob: https:",
  "font-src 'self' data:",
  "connect-src 'self' ws: wss:",
  "form-action 'self'",
].join('; ');

const securityHeaders = [
  { key: 'X-Content-Type-Options',  value: 'nosniff' },
  { key: 'X-Frame-Options',         value: 'DENY' },
  { key: 'Referrer-Policy',         value: 'strict-origin-when-cross-origin' },
  { key: 'Permissions-Policy',      value: 'camera=(), microphone=(), geolocation=()' },
  { key: 'Cross-Origin-Opener-Policy', value: 'same-origin' },
  { key: 'Cross-Origin-Resource-Policy', value: 'same-origin' },
  ...(process.env.NODE_ENV === 'production'
    ? [{ key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains; preload' }]
    : []),
  { key: 'Content-Security-Policy', value: contentSecurityPolicy },
];

const config: NextConfig = {
  serverExternalPackages: ['pg', 'pino'],
  experimental: {
    optimizePackageImports: ['highlight.js'],
  },
  async headers() {
    return [{ source: '/(.*)', headers: securityHeaders }];
  },
};

export default config;