#!/usr/bin/env node
// Generates sitemap.xml, robots.txt, and feed.xml for teknavglobal.com
import { writeFileSync, mkdirSync } from 'fs';
import { createRequire } from 'module';

const SITE = 'https://www.teknavglobal.com';

// Load article data (CommonJS-compatible workaround for ES module data)
const require = createRequire(import.meta.url);

// Dynamic import of global-data.js
const { articles, authors, siteConfig } = await import('../global-data.js');

function capDate(d) {
  const now = new Date().toISOString().split('T')[0];
  return d > now ? now : d;
}

// ── sitemap.xml ─────────────────────────────────────────────────────
const staticPages = [
  { url: '/', priority: '1.0', freq: 'daily' },
  { url: '/articles', priority: '0.9', freq: 'daily' },
  { url: '/about', priority: '0.7', freq: 'monthly' },
  { url: '/privacy', priority: '0.4', freq: 'yearly' },
  { url: '/terms', priority: '0.4', freq: 'yearly' },
  { url: '/editorial-policy', priority: '0.5', freq: 'monthly' },
];

const articleEntries = articles.map(a => ({
  url: `/article/${a.slug}`,
  lastmod: capDate(a.dateEn),
  priority: '0.8',
  freq: 'weekly',
}));

const allEntries = [...staticPages, ...articleEntries];

const sitemap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
${allEntries.map(e => `  <url>
    <loc>${SITE}${e.url}</loc>
    ${e.lastmod ? `<lastmod>${e.lastmod}</lastmod>` : ''}
    <changefreq>${e.freq}</changefreq>
    <priority>${e.priority}</priority>
  </url>`).join('\n')}
</urlset>`;

// ── robots.txt ──────────────────────────────────────────────────────
const robots = `User-agent: *
Allow: /
Disallow: /api/
Disallow: /profile/
Disallow: /admin/

Sitemap: ${SITE}/sitemap.xml
`;

// ── feed.xml (RSS) ──────────────────────────────────────────────────
const feed = `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content/">
  <channel>
    <title>Teknav — Deep Technology Analysis for Builders</title>
    <link>${SITE}</link>
    <description>Technical analysis on AI engineering, security, software architecture, and emerging compute.</description>
    <language>en</language>
    <lastBuildDate>${new Date().toUTCString()}</lastBuildDate>
    <atom:link href="${SITE}/feed.xml" rel="self" type="application/rss+xml"/>
    <image>
      <url>${SITE}/images/og/default.jpg</url>
      <title>Teknav</title>
      <link>${SITE}</link>
    </image>
${articles
  .sort((a, b) => new Date(b.dateEn) - new Date(a.dateEn))
  .map(a => {
    const author = authors.find(au => au.id === a.author);
    return `    <item>
      <title><![CDATA[${a.title}]]></title>
      <link>${SITE}/article/${a.slug}</link>
      <guid isPermaLink="true">${SITE}/article/${a.slug}</guid>
      <pubDate>${new Date(a.dateEn).toUTCString()}</pubDate>
      <description><![CDATA[${a.subtitle || a.metaDescription || ''}]]></description>
      ${author ? `<author>${author.name}</author>` : ''}
      <category>${a.category}</category>
    </item>`;
  }).join('\n')}
  </channel>
</rss>`;

mkdirSync('public', { recursive: true });
writeFileSync('public/sitemap.xml', sitemap);
writeFileSync('public/robots.txt', robots);
writeFileSync('public/feed.xml', feed);

console.log(`[seo] sitemap: ${allEntries.length} URLs | feed: ${articles.length} items`);