/**
 * H5P Core Files Setup Script
 *
 * This script downloads and sets up the H5P core files required for the editor and player.
 * It creates the necessary directory structure and downloads essential libraries.
 */

import fs from 'fs';
import path from 'path';
import https from 'https';
import { fileURLToPath } from 'url';
import { pipeline } from 'stream/promises';
import { createWriteStream } from 'fs';
import { exec } from 'child_process';
import { promisify } from 'util';

const execAsync = promisify(exec);
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const H5P_CORE_VERSION = '1.24';
const H5P_CORE_URL = `https://github.com/h5p/h5p-php-library/archive/refs/tags/${H5P_CORE_VERSION}.zip`;

// Create required directories
const dirs = [
  'h5p-core',
  'h5p-libraries',
  'h5p-content',
  'h5p-temp'
];

console.log('🎓 Setting up H5P Service...\n');

// Create directories
console.log('📁 Creating directories...');
dirs.forEach(dir => {
  const dirPath = path.join(__dirname, dir);
  if (!fs.existsSync(dirPath)) {
    fs.mkdirSync(dirPath, { recursive: true });
    console.log(`   ✅ Created ${dir}`);
  } else {
    console.log(`   ⏭️  ${dir} already exists`);
  }
});

// Download H5P core files
async function downloadH5PCore() {
  console.log('\n📦 Downloading H5P Core files...');
  console.log(`   Version: ${H5P_CORE_VERSION}`);

  const zipPath = path.join(__dirname, 'h5p-core.zip');
  const extractPath = path.join(__dirname, 'h5p-core-temp');

  try {
    // Download core zip
    await new Promise((resolve, reject) => {
      https.get(H5P_CORE_URL, (response) => {
        if (response.statusCode === 302 || response.statusCode === 301) {
          // Handle redirect
          https.get(response.headers.location, (redirectResponse) => {
            const fileStream = createWriteStream(zipPath);
            redirectResponse.pipe(fileStream);
            fileStream.on('finish', () => {
              fileStream.close();
              console.log('   ✅ Downloaded H5P core');
              resolve();
            });
          }).on('error', reject);
        } else {
          const fileStream = createWriteStream(zipPath);
          response.pipe(fileStream);
          fileStream.on('finish', () => {
            fileStream.close();
            console.log('   ✅ Downloaded H5P core');
            resolve();
          });
        }
      }).on('error', reject);
    });

    // Extract zip
    console.log('   📂 Extracting files...');

    // Check if unzip is available
    try {
      await execAsync(`unzip -q "${zipPath}" -d "${extractPath}"`);
    } catch (error) {
      console.log('   ⚠️  unzip not available, trying alternative method...');
      // Alternative: use Node.js built-in extraction if available
      throw new Error('Please install unzip: brew install unzip (macOS) or apt-get install unzip (Linux)');
    }

    // Move core files to h5p-core directory
    const extractedDir = fs.readdirSync(extractPath)[0];
    const coreSrcPath = path.join(extractPath, extractedDir, 'js');
    const coreDestPath = path.join(__dirname, 'h5p-core');

    if (fs.existsSync(coreSrcPath)) {
      // Copy js files
      await execAsync(`cp -r "${coreSrcPath}"/* "${coreDestPath}/"`);
      console.log('   ✅ H5P core files installed');
    }

    // Copy styles
    const stylesSrcPath = path.join(extractPath, extractedDir, 'styles');
    if (fs.existsSync(stylesSrcPath)) {
      const stylesDestPath = path.join(__dirname, 'h5p-core', 'styles');
      fs.mkdirSync(stylesDestPath, { recursive: true });
      await execAsync(`cp -r "${stylesSrcPath}"/* "${stylesDestPath}/"`);
      console.log('   ✅ H5P styles installed');
    }

    // Cleanup
    fs.unlinkSync(zipPath);
    fs.rmSync(extractPath, { recursive: true, force: true });

  } catch (error) {
    console.error('   ❌ Error downloading H5P core:', error.message);
    console.log('\n   💡 Manual setup:');
    console.log('   1. Download from: https://github.com/h5p/h5p-php-library/releases');
    console.log('   2. Extract to h5p-core/ directory');
  }
}

// Create basic H5P integration files
function createIntegrationFiles() {
  console.log('\n📝 Creating integration files...');

  // Create a minimal H5PIntegration.js file
  const integrationPath = path.join(__dirname, 'h5p-core', 'H5PIntegration.js');

  if (!fs.existsSync(integrationPath)) {
    const integrationContent = `
// H5P Integration
// This file is automatically generated by setup-h5p.js

var H5PIntegration = H5PIntegration || {};

console.log('H5P Core loaded');
    `.trim();

    fs.writeFileSync(integrationPath, integrationContent);
    console.log('   ✅ Created H5PIntegration.js');
  } else {
    console.log('   ⏭️  H5PIntegration.js already exists');
  }
}

// Create README
function createReadme() {
  const readme = `# H5P Service

## Setup erfolgreich!

Die folgenden Verzeichnisse wurden erstellt:

- \`h5p-core/\` - H5P Core JavaScript und CSS
- \`h5p-libraries/\` - Installierte H5P Content Type Libraries
- \`h5p-content/\` - Erstellte H5P Contents
- \`h5p-temp/\` - Temporäre Dateien

## H5P Content Types installieren

Um Content Types (wie Interactive Video, Quiz, etc.) zu verwenden, müssen diese
über die H5P Hub API installiert werden.

Der Editor zeigt verfügbare Content Types automatisch an.

## Entwicklung

\`\`\`bash
npm run dev    # Start mit nodemon (auto-reload)
npm start      # Production start
\`\`\`

## Endpoints

- \`GET /h5p/editor/new\` - Neuen Content erstellen
- \`GET /h5p/editor/:id\` - Content bearbeiten
- \`POST /h5p/editor/:id\` - Content speichern
- \`GET /h5p/play/:id\` - Content abspielen
- \`GET /h5p/libraries\` - Installierte Libraries

## Dokumentation

- H5P Official: https://h5p.org
- @lumieducation/h5p-server: https://github.com/Lumieducation/H5P-Nodejs-library
`;

  fs.writeFileSync(path.join(__dirname, 'H5P-README.md'), readme);
  console.log('   ✅ Created H5P-README.md');
}

// Main setup function
async function setup() {
  try {
    await downloadH5PCore();
    createIntegrationFiles();
    createReadme();

    console.log('\n✅ H5P Service setup complete!\n');
    console.log('📚 Next steps:');
    console.log('   1. Start the service: npm start');
    console.log('   2. Open http://localhost:8080');
    console.log('   3. Create H5P content via /h5p/editor/new');
    console.log('');
  } catch (error) {
    console.error('\n❌ Setup failed:', error);
    process.exit(1);
  }
}

setup();