#!/usr/bin/env node

import * as fs from 'fs';
import * as path from 'path';
import { glob } from 'glob';

interface SidebarItem {
  type: 'doc' | 'category';
  id?: string;
  label?: string;
  items?: SidebarItem[];
}

interface SidebarConfig {
  [key: string]: SidebarItem[];
}

class SidebarBuilder {
  private docsRoot: string;
  private domainOrder = ['overview', 'product', 'backend', 'frontend', 'rust', 'infra', 'security', 'ops', 'legal', 'misc'];

  constructor(docsRoot: string) {
    this.docsRoot = docsRoot;
  }

  async buildSidebars(): Promise<void> {
    console.log('📚 Génération des sidebars...');

    await this.buildSidebar('current');
    await this.buildSidebar('vision');
    
    console.log('✅ Sidebars générés avec succès!');
  }

  private async buildSidebar(track: 'current' | 'vision'): Promise<void> {
    const trackPath = path.join(this.docsRoot, track);
    const sidebarPath = path.join(trackPath, 'sidebars.js');
    
    console.log(`📖 Génération de la sidebar pour ${track}...`);

    const sidebar: SidebarItem[] = [];

    // Ajouter la page overview
    const overviewPath = path.join(trackPath, 'overview.md');
    if (fs.existsSync(overviewPath)) {
      sidebar.push({
        type: 'doc',
        id: 'overview'
      });
    }

    // Parcourir les domaines
    for (const domain of this.domainOrder) {
      const domainPath = path.join(trackPath, 'domains', domain);
      
      if (fs.existsSync(domainPath)) {
        const domainItems = await this.buildDomainSidebar(domainPath, domain);
        
        if (domainItems.length > 0) {
          sidebar.push({
            type: 'category',
            label: this.getDomainLabel(domain),
            items: domainItems
          });
        }
      }
    }

    // Générer le contenu JavaScript
    const sidebarContent = this.generateSidebarContent(sidebar, track);
    
    fs.writeFileSync(sidebarPath, sidebarContent);
    console.log(`✅ Sidebar ${track} générée: ${sidebarPath}`);
  }

  private async buildDomainSidebar(domainPath: string, domain: string): Promise<SidebarItem[]> {
    const items: SidebarItem[] = [];
    
    // Chercher tous les fichiers .md et .mdx
    const patterns = ['*.md', '*.mdx'];
    const allFiles: string[] = [];
    
    for (const pattern of patterns) {
      const files = await glob(pattern, { cwd: domainPath });
      allFiles.push(...files);
    }

    // Trier les fichiers
    allFiles.sort((a, b) => {
      // Mettre les fichiers README en premier
      if (a.toLowerCase().includes('readme')) return -1;
      if (b.toLowerCase().includes('readme')) return 1;
      
      // Puis trier alphabétiquement
      return a.localeCompare(b);
    });

    // Créer les items de sidebar
    for (const file of allFiles) {
      const filePath = path.join(domainPath, file);
      const content = fs.readFileSync(filePath, 'utf-8');
      
      const frontmatter = this.extractFrontmatter(content);
      const slug = path.basename(file, path.extname(file));
      
      items.push({
        type: 'doc',
        id: `${domain}/${slug}`,
        label: frontmatter.sidebar_label || frontmatter.title || this.generateLabelFromFilename(file)
      });
    }

    return items;
  }

  private extractFrontmatter(content: string): Record<string, any> {
    const frontmatterRegex = /^---\s*\n([\s\S]*?)\n---\s*\n/;
    const match = content.match(frontmatterRegex);
    
    if (!match) return {};

    const frontmatterText = match[1];
    const frontmatter: Record<string, any> = {};
    
    frontmatterText.split('\n').forEach(line => {
      const [key, ...valueParts] = line.split(':');
      if (key && valueParts.length > 0) {
        const value = valueParts.join(':').trim();
        frontmatter[key.trim()] = value.replace(/^["']|["']$/g, '');
      }
    });

    return frontmatter;
  }

  private generateLabelFromFilename(filename: string): string {
    const baseName = path.basename(filename, path.extname(filename));
    return baseName
      .replace(/[-_]/g, ' ')
      .replace(/\b\w/g, l => l.toUpperCase());
  }

  private getDomainLabel(domain: string): string {
    const labels: Record<string, string> = {
      'overview': '📋 Aperçu',
      'product': '🎯 Produit',
      'backend': '⚙️ Backend',
      'frontend': '🎨 Frontend',
      'rust': '🦀 Rust',
      'infra': '🏗️ Infrastructure',
      'security': '🔒 Sécurité',
      'ops': '🔧 Opérations',
      'legal': '📜 Légal',
      'misc': '📁 Divers'
    };

    return labels[domain] || domain;
  }

  private generateSidebarContent(sidebar: SidebarItem[], track: string): string {
    const sidebarJson = JSON.stringify(sidebar, null, 2);
    
    return `/**
 * @type {import('@docusaurus/plugin-content-docs').SidebarsConfig}
 * Sidebar généré automatiquement pour ${track}
 * 
 * Généré le: ${new Date().toISOString()}
 */

const sidebars = {
  ${track}Sidebar: ${sidebarJson}
};

module.exports = sidebars;
`;
  }

  async run(): Promise<void> {
    console.log('📚 Démarrage de la génération des sidebars...');
    
    try {
      await this.buildSidebars();
      console.log('✅ Génération des sidebars terminée!');
    } catch (error) {
      console.error('❌ Erreur lors de la génération des sidebars:', error);
      process.exit(1);
    }
  }
}

// Exécution du script
if (require.main === module) {
  const docsRoot = process.argv[2] || path.join(__dirname, '..');
  const builder = new SidebarBuilder(docsRoot);
  builder.run();
}

export { SidebarBuilder };