import type { NextConfig } from "next";

const appEnvironment=process.env.APP_ENV||(process.env.NODE_ENV==='development'?'development':'production');
if(!['development','test','production'].includes(appEnvironment))throw new Error('Invalid APP_ENV');

const nextConfig: NextConfig = {
  output: 'standalone',
  outputFileTracingExcludes: {
    '/*': ['./dist/**/*', './tests/**/*', './.next/cache/**/*', './.next-test/cache/**/*', './.next-dev/cache/**/*'],
  },
  // Turbopack's route runtime is external; keep it in relocatable standalone releases.
  outputFileTracingIncludes: {
    '/*': ['./node_modules/next/dist/compiled/next-server/*runtime.prod.js'],
  },
  distDir: appEnvironment==='development'?'.next-dev':appEnvironment==='test'?'.next-test':'.next',
  trailingSlash: true,
  // Page redirects live in src/proxy.ts; API and media URLs keep their exact paths.
  skipTrailingSlashRedirect: true,
  // Serve the complete page metadata in <head> to browsers and crawlers alike.
  htmlLimitedBots: /.*/,
  images: { unoptimized: true },
  poweredByHeader: false,
  turbopack: { root: process.cwd() },
  async headers() {
    const xml=[{key:'Content-Type',value:'application/xml; charset=utf-8'}]
    const xsl=[{key:'Content-Type',value:'text/xsl; charset=utf-8'}]
    return [
      {source:'/sitemap.xml',headers:xml},
      {source:'/sitemaps/:file',headers:xml},
      {source:'/static/sitemapindex.xsl',headers:xsl},
      {source:'/static/sitemap.xsl',headers:xsl},
    ]
  },
};

export default nextConfig;