#!/usr/bin/env node
/**
 * Sitemap generator for Hastebin
 * Generates sitemap.xml with static pages and MCP discovery endpoint
 */

const fs = require('fs');
const path = require('path');

// Get base URL from environment or use default
const baseUrl = process.env.HASTEBIN_BASE_URL || 
                process.env.HASTEBIN_SITEMAP_URL || 
                'https://haste.nixc.us';

// Static pages to include in sitemap
const pages = [
  {
    loc: '/',
    changefreq: 'weekly',
    priority: '1.0',
    description: 'Homepage - create and share code snippets'
  },
  {
    loc: '/about',
    changefreq: 'monthly',
    priority: '0.8',
    description: 'About page with documentation and usage instructions'
  },
  {
    loc: '/.well-known/mcp.json',
    changefreq: 'monthly',
    priority: '0.7',
    description: 'MCP (Model Context Protocol) discovery endpoint for AI assistants'
  }
];

// Generate sitemap XML
function generateSitemap() {
  const today = new Date().toISOString().split('T')[0];
  
  let xml = '<?xml version="1.0" encoding="UTF-8"?>\n';
  xml += '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"\n';
  xml += '        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n';
  xml += '        xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9\n';
  xml += '        http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">\n';
  xml += '\n';
  xml += '  <!-- Hastebin Sitemap -->\n';
  xml += '  <!-- Generated: ' + today + ' -->\n';
  xml += '  <!-- Base URL: ' + baseUrl + ' -->\n';
  xml += '\n';

  for (const page of pages) {
    xml += '  <!-- ' + page.description + ' -->\n';
    xml += '  <url>\n';
    xml += '    <loc>' + baseUrl + page.loc + '</loc>\n';
    xml += '    <lastmod>' + today + '</lastmod>\n';
    xml += '    <changefreq>' + page.changefreq + '</changefreq>\n';
    xml += '    <priority>' + page.priority + '</priority>\n';
    xml += '  </url>\n';
    xml += '\n';
  }

  xml += '</urlset>\n';

  return xml;
}

// Generate robots.txt content
function generateRobotsTxt() {
  let robots = '# Hastebin robots.txt\n';
  robots += '# Updated: ' + new Date().toISOString().split('T')[0] + '\n';
  robots += '\n';
  robots += 'User-agent: *\n';
  robots += '\n';
  robots += '# Allow static pages\n';
  robots += 'Allow: /$\n';
  robots += 'Allow: /about\n';
  robots += '\n';
  robots += '# Allow MCP discovery for AI assistants and tools\n';
  robots += 'Allow: /.well-known/\n';
  robots += 'Allow: /.well-known/mcp.json\n';
  robots += '\n';
  robots += '# Disallow individual pastes (ephemeral content)\n';
  robots += 'Disallow: /raw/\n';
  robots += 'Disallow: /documents/\n';
  robots += '\n';
  robots += '# Disallow paste URLs (random keys)\n';
  robots += '# Pastes are identified by 10-character alphanumeric keys\n';
  robots += 'Disallow: /*.*\n';
  robots += '\n';
  robots += '# Sitemap location\n';
  robots += 'Sitemap: ' + baseUrl + '/sitemap.xml\n';

  return robots;
}

// Main execution
const staticDir = path.join(__dirname, '..', 'static');

// Generate and write sitemap.xml
const sitemapContent = generateSitemap();
const sitemapPath = path.join(staticDir, 'sitemap.xml');
fs.writeFileSync(sitemapPath, sitemapContent, 'utf8');
console.log('Generated sitemap.xml at', sitemapPath);
console.log('Base URL:', baseUrl);
console.log('Pages included:', pages.length);

// Generate and write robots.txt
const robotsContent = generateRobotsTxt();
const robotsPath = path.join(staticDir, 'robots.txt');
fs.writeFileSync(robotsPath, robotsContent, 'utf8');
console.log('Generated robots.txt at', robotsPath);

console.log('\nSitemap generation complete!');