import { readFileSync, writeFileSync } from 'node:fs';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const root = resolve(__dirname, '..');

const today = new Date().toISOString().split('T')[0];

const staticRoutes = [
  { url: '/', priority: '1.0', changefreq: 'weekly' },
  { url: '/about', priority: '0.8', changefreq: 'monthly' },
  { url: '/services', priority: '0.8', changefreq: 'monthly' },
  { url: '/pricing', priority: '0.8', changefreq: 'weekly' },
  { url: '/blog', priority: '0.9', changefreq: 'daily' },
  { url: '/privacy-policy', priority: '0.3', changefreq: 'yearly' },
  { url: '/terms-of-use', priority: '0.3', changefreq: 'yearly' },
];

let blogRoutes = [];
try {
  const posts = JSON.parse(readFileSync(resolve(root, 'public/blog/posts.json'), 'utf-8'));
  blogRoutes = posts.map(p => ({
    url: `/blog/${p.slug}`,
    priority: '0.7',
    changefreq: 'monthly',
    lastmod: p.date || today,
  }));
} catch {
  console.warn('Could not read posts.json, skipping blog routes');
}

const allRoutes = [
  ...staticRoutes.map(r => ({ ...r, lastmod: today })),
  ...blogRoutes,
];

const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${allRoutes.map(r => `  <url>
    <loc>https://ai-impress.com${r.url}</loc>
    <lastmod>${r.lastmod}</lastmod>
    <changefreq>${r.changefreq}</changefreq>
    <priority>${r.priority}</priority>
  </url>`).join('\n')}
</urlset>
`;

writeFileSync(resolve(root, 'public/sitemap.xml'), xml, 'utf-8');
console.log(`Sitemap generated with ${allRoutes.length} URLs`);