const fs = require('fs');
const ytdl = require('ytdl-core-enhanced');

// Download a video
ytdl('https://www.youtube.com/watch?v=dQw4w9WgXcQ')
  .pipe(fs.createWriteStream('video.mp4'));

const ytdl = require('ytdl-core-enhanced');
const fs = require('fs');

// Simple download
ytdl('https://youtu.be/dQw4w9WgXcQ', { quality: 'highest' })
  .pipe(fs.createWriteStream('my-video.mp4'));

// Audio only download
ytdl('https://youtu.be/dQw4w9WgXcQ', { filter: 'audioonly' })
  .pipe(fs.createWriteStream('my-audio.mp3'));

// Get video information
const info = await ytdl.getInfo('https://youtu.be/dQw4w9WgXcQ');
console.log('Title:', info.videoDetails.title);
console.log('Duration:', info.videoDetails.lengthSeconds);

const stream = ytdl('https://youtu.be/dQw4w9WgXcQ');

stream.on('progress', (chunkLength, downloaded, total) => {
  const percent = (downloaded / total * 100).toFixed(2);
  console.log(`Downloaded: ${percent}%`);
});

stream.pipe(fs.createWriteStream('video.mp4'));

// Specific quality
ytdl(url, { quality: '720p' })

// Highest quality
ytdl(url, { quality: 'highest' })

// Lowest quality (fastest download)
ytdl(url, { quality: 'lowest' })

// Custom filter
ytdl(url, { 
  filter: format => format.container === 'mp4' && format.hasVideo 
})

// Multi-client approach (default: enabled)
const info = await ytdl.getInfo(url, { 
  playerClients: ['WEB', 'TV', 'ANDROID', 'IOS', 'WEB_EMBEDDED'] 
});

// Use specific clients only
const info = await ytdl.getInfo(url, { 
  playerClients: ['WEB', 'ANDROID'] 
});

// Advanced signature extraction with TCE patterns
const stream = ytdl(url, { quality: 'highest' });
// Automatically uses DisTube's signature extraction methods

// Download specific byte range
ytdl(url, { 
  range: { start: 0, end: 1024 * 1024 } // First 1MB
})

// Use IPv6 block for download
ytdl(url, { 
  IPv6Block: '2001:db8::/32' 
})

// Multi-threading automatically enabled for files >2MB
const stream = ytdl(url, { quality: 'highest' });
// Provides 2-6% speed boost for large video files

// Customize multi-threading settings
const stream = ytdl(url, {
  quality: 'highest',
  multiThread: true,           // Force enable (default: auto)
  maxThreads: 4,              // Max concurrent threads (default: 4)
  minSizeForMultiThread: 1024 * 1024 // Min size for threading (default: 2MB)
});

// Disable multi-threading
const stream = ytdl(url, {
  quality: 'highest',
  multiThread: false  // Single-threaded download
});

// Anti-bot protection automatically enabled
const info = await ytdl.getInfo(url); // Uses rotating User-Agents

// Manual anti-bot configuration
ytdl.antiBot.applyAntiBotHeaders(options, url);

// Get anti-bot status
const status = ytdl.antiBot.getStatus();
console.log('Current User-Agent:', status.currentUserAgent);
console.log('Request count:', status.requestCount);

// Enhanced request with anti-bot measures
const response = await ytdl.antiBot.makeRequest(url, options);

// NEW: Advanced authentication manager
const authManager = ytdl.auth;

// Quick setup with browser cookies (automatic)
await authManager.setupWithBrowser('chrome');  // Auto-extracts from Chrome
await authManager.setupWithBrowser('edge');    // Auto-extracts from Edge
await authManager.setupWithBrowser('firefox'); // Auto-extracts from Firefox

// Manual cookie setup (guided)
authManager.setupManual(); // Provides step-by-step instructions

// Add individual cookies
authManager.addCookie('VISITOR_INFO1_LIVE', 'your_value_here');
authManager.addCookie('CONSENT', 'YES+cb.20210328-17-p0.en+FX+700');

// Add multiple cookies at once
authManager.addCookies({
  VISITOR_INFO1_LIVE: 'your_visitor_data',
  SESSION_TOKEN: 'your_session_token',
  CONSENT: 'YES+cb.20210328-17-p0.en+FX+700'
});

// Add from cookie string
authManager.addCookieString('VISITOR_INFO1_LIVE=value; CONSENT=value');

// Import from Netscape cookies.txt file
authManager.importCookieFile('./cookies.txt');

// Get authentication status
const status = authManager.getStatus();
console.log('Authenticated:', status.isAuthenticated);
console.log('Cookies loaded:', status.cookieCount);

// Use authenticated downloads
const info = await ytdl.getInfo(url); // Cookies automatically applied
const stream = ytdl(url, { quality: 'highest' }); // Works with age-restricted videos

const express = require('express');
const ytdl = require('ytdl-core-enhanced');
const app = express();

app.get('/download', async (req, res) => {
  const { url } = req.query;
  
  if (!ytdl.validateURL(url)) {
    return res.status(400).send('Invalid YouTube URL');
  }

  try {
    const info = await ytdl.getInfo(url);
    res.header('Content-Disposition', `attachment; filename="${info.videoDetails.title}.mp4"`);
    
    ytdl(url, { quality: 'highest' }).pipe(res);
  } catch (error) {
    res.status(500).send('Download failed');
  }
});

const ytdl = require('ytdl-core-enhanced');

try {
  const stream = ytdl('https://youtu.be/dQw4w9WgXcQ');
  
  stream.on('error', (error) => {
    console.error('Download error:', error.message);
    // Automatic fallback will be attempted
  });
  
  stream.on('info', (info, format) => {
    console.log('Using format:', format.qualityLabel);
  });
  
} catch (error) {
  console.error('Setup error:', error.message);
}

// Download specific audio format (140 = 128kbps AAC)
const stream = ytdl(url, { format: { itag: 140 } });

// Download specific video format (298 = 720p MP4)
const stream = ytdl(url, { format: { itag: 298 } });

// Audio only formats
const audioFormats = info.formats.filter(format => 
  format.hasAudio && !format.hasVideo
);

// Video only formats  
const videoFormats = info.formats.filter(format => 
  format.hasVideo && !format.hasAudio
);

// Combined audio+video formats
const combinedFormats = info.formats.filter(format => 
  format.hasAudio && format.hasVideo
);

// Highest quality video
const stream = ytdl(url, { quality: 'highest' });

// Lowest quality (fastest download)
const stream = ytdl(url, { quality: 'lowest' });

// Best audio quality
const stream = ytdl(url, { quality: 'highestaudio' });

// Lowest audio (bandwidth saving)
const stream = ytdl(url, { quality: 'lowestaudio' });

const info = await ytdl.getInfo(url);

// Print all available formats
info.formats.forEach(format => {
  console.log(`Format ${format.itag}:`);
  console.log(`  Quality: ${format.qualityLabel || 'Audio only'}`);
  console.log(`  Container: ${format.container}`);
  console.log(`  Size: ${format.contentLength ? 
    (format.contentLength / 1024 / 1024).toFixed(2) + 'MB' : 'Unknown'}`);
  console.log(`  Audio: ${format.hasAudio ? 
    format.audioBitrate + 'kbps' : 'No'}`);
  console.log(`  Video: ${format.hasVideo ? 
    format.qualityLabel : 'No'}`);
  console.log(`  URL: ${format.url}\n`);
});

// Categorize formats
console.log(`📀 Audio formats: ${audioFormats.length}`);
console.log(`🎬 Video formats: ${videoFormats.length}`);  
console.log(`🎭 Combined formats: ${combinedFormats.length}`);
console.log(`📊 Total formats: ${info.formats.length}`);

// 🎵 Music/Podcast Download (Best Quality Audio)
const musicStream = ytdl(url, { 
  filter: format => format.itag === 140 // 128kbps AAC
});

// 📱 Mobile Video (Balance Quality/Size)  
const mobileStream = ytdl(url, {
  filter: format => format.itag === 396 // 360p MP4
});

// 💻 Desktop Video (Good Quality)
const desktopStream = ytdl(url, {
  filter: format => format.itag === 298 // 720p MP4
});

// 📺 High Quality Video (Large File)
const hdStream = ytdl(url, {
  filter: format => format.itag === 299 // 1080p MP4
});

// ⚡ Fast Download (Small File)
const fastStream = ytdl(url, {
  filter: format => format.itag === 598 // 144p MP4
});

const fs = require('fs');
const ytdl = require('ytdl-core-enhanced');

// Tải video
ytdl('https://www.youtube.com/watch?v=dQw4w9WgXcQ')
  .pipe(fs.createWriteStream('video.mp4'));

const ytdl = require('ytdl-core-enhanced');
const fs = require('fs');

// Tải đơn giản
ytdl('https://youtu.be/dQw4w9WgXcQ', { quality: 'highest' })
  .pipe(fs.createWriteStream('video-cua-toi.mp4'));

// Chỉ tải âm thanh
ytdl('https://youtu.be/dQw4w9WgXcQ', { filter: 'audioonly' })
  .pipe(fs.createWriteStream('nhac-cua-toi.mp3'));

// Lấy thông tin video
const info = await ytdl.getInfo('https://youtu.be/dQw4w9WgXcQ');
console.log('Tiêu đề:', info.videoDetails.title);
console.log('Thời lượng:', info.videoDetails.lengthSeconds);

const stream = ytdl('https://youtu.be/dQw4w9WgXcQ');

stream.on('progress', (chunkLength, downloaded, total) => {
  const percent = (downloaded / total * 100).toFixed(2);
  console.log(`Đã tải: ${percent}%`);
});

stream.pipe(fs.createWriteStream('video.mp4'));

// Chất lượng cụ thể
ytdl(url, { quality: '720p' })

// Chất lượng cao nhất
ytdl(url, { quality: 'highest' })

// Chất lượng thấp nhất (tải nhanh nhất)
ytdl(url, { quality: 'lowest' })

// Multi-client approach (mặc định: bật)
const info = await ytdl.getInfo(url, { 
  playerClients: ['WEB', 'TV', 'ANDROID', 'IOS', 'WEB_EMBEDDED'] 
});

// Chỉ sử dụng client cụ thể
const info = await ytdl.getInfo(url, { 
  playerClients: ['WEB', 'ANDROID'] 
});

// Signature extraction nâng cao với TCE patterns
const stream = ytdl(url, { quality: 'highest' });
// Tự động sử dụng phương pháp signature extraction của DisTube

// Sử dụng cookie cơ bản
const info = await ytdl.getInfo(url, {
  requestOptions: {
    headers: {
      Cookie: 'VISITOR_INFO1_LIVE=xyz; CONSENT=YES+cb'
    }
  }
});

// Video giới hạn độ tuổi với cookie
const stream = ytdl(url, {
  quality: 'highest',
  requestOptions: {
    headers: {
      Cookie: 'VISITOR_INFO1_LIVE=abc; SESSION_TOKEN=def'
    }
  }
});

// Cách lấy cookie từ trình duyệt:
// 1. Mở YouTube trên trình duyệt
// 2. F12 -> Application -> Cookies -> youtube.com  
// 3. Copy VISITOR_INFO1_LIVE và các cookie khác

try {
  const stream = ytdl('https://youtu.be/dQw4w9WgXcQ');
  
  stream.on('error', (error) => {
    console.error('Lỗi tải:', error.message);
    // Hệ thống sẽ tự động fallback
  });
  
  stream.on('info', (info, format) => {
    console.log('Đang dùng format:', format.qualityLabel);
  });
  
} catch (error) {
  console.error('Lỗi thiết lập:', error.message);
}