const fs = require('fs');
const { SitemapStream, streamToPromise } = require('sitemap');
const path = require('path');

const hostname = 'https://metatroncube.in';
const addTrailingSlash = true; // ✅ Set this true if your Next.js uses trailingSlash: true

// // 🔧 Utility to format URLs based on config
// const formatUrl = (url) => {
//   if (addTrailingSlash && !url.endsWith('/')) return url + '/';
//   if (!addTrailingSlash && url.endsWith('/') && url !== '/') return url.slice(0, -1);
//   return url;
// };
// Add a trailing slash only for “directory-like” URLs
const shouldAddSlash = (url) => {
  // keep "/" as is
  if (url === '/') return false;
  // don't touch file-like URLs (has extension)
  if (/\.[a-z0-9]{2,6}(\?.*)?$/i.test(url)) return false;
  return true;
};

const formatUrl = (url) => {
  // normalize to leading slash
  if (!url.startsWith('/')) url = '/' + url;

  if (addTrailingSlash && shouldAddSlash(url) && !url.endsWith('/')) {
    return url + '/';
  }
  if (!addTrailingSlash && url.endsWith('/') && url !== '/') {
    return url.slice(0, -1);
  }
  return url;
};

// ✅ Static pages
const staticLinks = [
  { url: '/', changefreq: 'daily', priority: 1.0 },
  { url: '/services-digital-solutions/', changefreq: 'daily', priority: 0.7 },
  { url: '/about/', changefreq: 'weekly', priority: 0.7 },
  { url: '/careers/', changefreq: 'weekly', priority: 0.7 },
  { url: '/portfolio/', changefreq: 'weekly', priority: 0.7 },
  { url: '/blog/', changefreq: 'weekly', priority: 0.7 },
  { url: '/contact/', changefreq: 'monthly', priority: 0.5 },
  { url: '/faq/', changefreq: 'monthly', priority: 0.5 },
  { url: '/accessibility-statement-for-metatroncube-software-solutions/', changefreq: 'weekly', priority: 0.6 },
  { url: '/privacy-policy/', changefreq: 'weekly', priority: 0.6 },
  { url: '/service/website-development-company/', changefreq: 'weekly', priority: 0.6 },
  { url: '/service/mobile-application-development/', changefreq: 'weekly', priority: 0.6 },
  { url: '/service/graphic-designing-company/', changefreq: 'weekly', priority: 0.6 },
  { url: '/service/ui-ux-designing/', changefreq: 'weekly', priority: 0.6 },
  { url: '/service/search-engine-optimization-seo-content-writing/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/digital-solutions/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/app-development-waterloo/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/kitchener-waterloo-website-design-services/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/professional-website-designers-in-waterloo/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/waterloo-seo-services/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/web-design-toronto-custom-website-creation-by-metatroncube-software-solutions/', changefreq: 'weekly', priority: 0.6 },
  // { url: '/service/web-page-design-in-waterloo/', changefreq: 'weekly', priority: 0.6 },

];

// ✅ Dynamic blog posts
const blogPosts = [
  { slug: 'top-web-development-trends-to-watch-in-2025/' },
  { slug: 'why-every-startup-needs-a-mobile-app-in-2025/' },
  { slug: 'how-seo-content-writing-boost-online-sales/' },
  { slug: 'top-digital-marketing-strategies-for-2025-that-actually-work/' },
  { slug: 'why-ui-ux-design-can-make-or-break-your-app-in-2025/' },
  { slug: 'how-metatroncube-transforms-businesses-through-digital-marketing-excellence/' },
];

// Convert blog slugs to sitemap entries
const blogLinks = blogPosts.map(post => ({
  url: `/${post.slug}`,
  changefreq: 'weekly',
  priority: 0.6,
}));

const seen = new Set();
const allLinks = [...staticLinks, ...blogLinks]
  .map(link => ({ ...link, url: formatUrl(link.url) }))
  .filter(link => {
    if (seen.has(link.url)) return false;
    seen.add(link.url);
    return true;
  });

async function generateSitemap() {
  try {
    const sitemap = new SitemapStream({ hostname });
    const filePath = path.resolve(__dirname, '../public/sitemap.xml');
    const writeStream = fs.createWriteStream(filePath);

    sitemap.pipe(writeStream);

    console.log('📦 Writing URLs to sitemap:');
    allLinks.forEach(link => {
      console.log(' -', hostname + link.url);
      sitemap.write(link);
    });

    sitemap.end();

    await Promise.all([
      streamToPromise(sitemap),
      new Promise(resolve => writeStream.on('finish', resolve)),
    ]);

    console.log(`✅ Sitemap.xml created successfully! at: ${filePath}`);
  } catch (error) {
    console.error('❌ Error creating sitemap.xml:', error);
  }
}

generateSitemap();