#!/usr/bin/env node

/**
 * update-nav-from-sitemap.js
 * 
 * This script reads the sitemap.xml file and updates the navigation menu in header.html
 * to include all story pages found in the sitemap.
 * 
 * No external dependencies required.
 */

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

// Configuration
const SITEMAP_PATH = path.join(__dirname, 'sitemap.xml');
const HEADER_PATH = path.join(__dirname, 'includes', 'header.html');
const STORIES_PATH_PREFIX = '/stories/';
const STORIES_PATH_EXCLUDE = ['index.html', 'story-with-includes.html', 'template-story.html'];

// Helper function to get a friendly name from a filename
function getFriendlyName(filename) {
  // Remove .html extension
  let name = filename.replace('.html', '');
  
  // Replace hyphens with spaces
  name = name.replace(/-/g, ' ');
  
  // Capitalize first letter of each word
  return name.split(' ')
    .map(word => word.charAt(0).toUpperCase() + word.slice(1))
    .join(' ');
}

// Simple XML parser for sitemap (no external dependencies)
function extractUrlsFromSitemap(sitemapContent) {
  const urls = [];
  const matches = sitemapContent.match(/<loc>([^<]+)<\/loc>/g) || [];
  
  for (const match of matches) {
    const url = match.replace('<loc>', '').replace('</loc>', '');
    urls.push(url);
  }
  
  return urls;
}

// Main function
async function updateNavFromSitemap() {
  console.log('Updating navigation menu from sitemap.xml...');
  
  try {
    // Read sitemap.xml
    const sitemapContent = fs.readFileSync(SITEMAP_PATH, 'utf8');
    const urls = extractUrlsFromSitemap(sitemapContent);
    
    // Extract story URLs from sitemap
    const storyPages = [];
    
    for (const url of urls) {
      // Check if this is a story page
      if (url.includes(STORIES_PATH_PREFIX)) {
        const filename = url.split('/').pop();
        
        // Skip excluded files
        if (!STORIES_PATH_EXCLUDE.includes(filename)) {
          storyPages.push({
            filename,
            url: STORIES_PATH_PREFIX + filename,
            name: getFriendlyName(filename)
          });
        }
      }
    }
    
    // Sort story pages alphabetically by name
    storyPages.sort((a, b) => a.name.localeCompare(b.name));
    
    // Read header.html
    let headerContent = fs.readFileSync(HEADER_PATH, 'utf8');
    
    // Find the stories dropdown content
    const dropdownStartMarker = '<a href="/stories/" id="nav-stories">Stories</a>';
    const dropdownEndMarker = '</div>';
    
    const dropdownStartIndex = headerContent.indexOf(dropdownStartMarker);
    if (dropdownStartIndex === -1) {
      throw new Error('Could not find stories dropdown in header.html');
    }
    
    // Find the start of the dropdown content
    const contentStartIndex = headerContent.indexOf('<div class="dropdown-content">', dropdownStartIndex);
    if (contentStartIndex === -1) {
      throw new Error('Could not find dropdown content in header.html');
    }
    
    // Find the end of the dropdown content
    const contentEndIndex = headerContent.indexOf(dropdownEndMarker, contentStartIndex);
    if (contentEndIndex === -1) {
      throw new Error('Could not find end of dropdown content in header.html');
    }
    
    // Generate new dropdown content
    let newDropdownContent = '<div class="dropdown-content">\n';
    storyPages.forEach(page => {
      const navId = 'nav-' + page.filename.replace('.html', '').replace(/-/g, '');
      newDropdownContent += `                    <a href="${page.url}" id="${navId}">${page.name}</a>\n`;
    });
    
    // Replace dropdown content in header.html
    const newHeaderContent = 
      headerContent.substring(0, contentStartIndex) + 
      newDropdownContent + 
      '                ' + dropdownEndMarker + 
      headerContent.substring(contentEndIndex + dropdownEndMarker.length);
    
    // Write updated header.html
    fs.writeFileSync(HEADER_PATH, newHeaderContent, 'utf8');
    
    console.log(`Updated navigation menu with ${storyPages.length} story pages`);
    return true;
  } catch (error) {
    console.error('Error updating navigation menu:', error);
    return false;
  }
}

// Execute if run directly
if (require.main === module) {
  updateNavFromSitemap();
}

module.exports = { updateNavFromSitemap };