from flask import Flask, render_template, request, jsonify, send_file, redirect, url_for
import yt_dlp
import os
import uuid
from datetime import datetime
import threading
import subprocess
import shutil
import time

app = Flask(__name__)
app.config['DOWNLOAD_FOLDER'] = 'static/downloads'

if not os.path.exists(app.config['DOWNLOAD_FOLDER']):
    os.makedirs(app.config['DOWNLOAD_FOLDER'])

download_status = {}

def check_ffmpeg():
    """Verificar si FFmpeg está disponible en el sistema"""
    try:
        result = subprocess.run(['ffmpeg', '-version'],
                                capture_output=True, text=True, timeout=10)
        return result.returncode == 0
    except (subprocess.TimeoutExpired, FileNotFoundError):
        return False

def install_ffmpeg():
    """Intentar instalar FFmpeg automáticamente"""
    try:
        # Detectar el sistema operativo
        import platform
        system = platform.system().lower()

        if system == 'linux':
            # Para sistemas basados en Debian/Ubuntu
            commands = [
                ['sudo', 'apt-get', 'update'],
                ['sudo', 'apt-get', 'install', '-y', 'ffmpeg']
            ]
        elif system == 'darwin':
            # Para macOS usando Homebrew
            commands = [
                ['brew', 'update'],
                ['brew', 'install', 'ffmpeg']
            ]
        elif system == 'windows':
            # Para Windows (simplificado - requeriría manual)
            return False
        else:
            return False

        for cmd in commands:
            result = subprocess.run(cmd, capture_output=True, text=True)
            if result.returncode != 0:
                return False

        return True
    except Exception:
        return False

class DownloadProgress:
    def __init__(self, download_id):
        self.download_id = download_id
        self.status = 'starting'
        self.progress = 0
        self.speed = ''
        self.eta = ''
        self.filename = ''
        self.error = None
        self.complete = False

    def update(self, d):
        if d['status'] == 'downloading':
            self.status = 'downloading'
            self.progress = d.get('_percent_str', '0%').strip('%')
            self.speed = d.get('_speed_str', '')
            self.eta = d.get('_eta_str', '')
            self.filename = d.get('filename', '')
        elif d['status'] == 'finished':
            self.status = 'finished'
            self.complete = True
            self.progress = 100
        elif d['status'] == 'error':
            self.status = 'error'
            self.error = d.get('error', 'Unknown error')

def hook(d, download_id):
    if download_id in download_status:
        download_status[download_id].update(d)

def download_video(url, download_id, format_type='mp4'):
    progress = DownloadProgress(download_id)
    download_status[download_id] = progress

    # Verificar FFmpeg para formatos que lo requieren
    if format_type == 'mp3':
        if not check_ffmpeg():
            progress.status = 'error'
            progress.error = "FFmpeg no está disponible. La conversión a MP3 requiere FFmpeg. Por favor, instala FFmpeg o contacta al administrador."
            return

        # Opcional: intentar instalar FFmpeg automáticamente si no está disponible
        # if install_ffmpeg():
        #     progress.status = 'info'
        #     progress.error = "FFmpeg ha sido instalado automáticamente. Intenta la descarga nuevamente."
        # else:
        #     progress.status = 'error'
        #     progress.error = "No se pudo instalar FFmpeg automáticamente. La conversión a MP3 requiere FFmpeg."
        #     return

    try:
        ydl_opts = {
            'outtmpl': os.path.join(app.config['DOWNLOAD_FOLDER'], f'{download_id}.%(ext)s'),
            'progress_hooks': [lambda d: hook(d, download_id)],
            'quiet': True,
            'no_warnings': True,
            # Configuración funcional probada con yt-dlp 2025.10.22
            'extract_flat': False,
            'restrictfilenames': True,
            'no_check_certificate': True,
            'socket_timeout': 60,
            'retries': 10,
            'fragment_retries': 15,
            'extractor_retries': 10,
            'file_access_retries': 10,
            'ignoreerrors': False,
            'user_agent': 'yt-dlp/2025.10.22',
            'http_headers': {
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
                'Accept-Language': 'en-US,en;q=0.9',
                'Accept-Encoding': 'gzip, deflate, br',
                'DNT': '1',
                'Connection': 'keep-alive',
                'Upgrade-Insecure-Requests': '1',
                'Sec-Fetch-Dest': 'document',
                'Sec-Fetch-Mode': 'navigate',
                'Sec-Fetch-Site': 'none',
                'Sec-Fetch-User': '?1',
                'sec-ch-ua': '"Chromium";v="130", "Google Chrome";v="130", "Not?A_Brand";v="99"',
                'sec-ch-ua-mobile': '?0',
                'sec-ch-ua-platform': '"Windows"'
            }
        }

        if format_type == 'mp3':
            ydl_opts.update({
                'format': 'bestaudio[ext=m4a]/bestaudio/best',
                'postprocessors': [{
                    'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'mp3',
                    'preferredquality': '192',
                }],
                'writethumbnail': False,
                'embed_thumbnail': False,
                'addmetadata': True,
            })
        else:  # mp4
            ydl_opts.update({
                'format': 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best',
                'merge_output_format': 'mp4',
            })

        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            ydl.extract_info(url, download=True)

    except yt_dlp.utils.DownloadError as e:
        progress.status = 'error'
        if "403" in str(e):
            progress.error = "Error de acceso (403). El video puede estar restringido o no disponible. Intenta con otro video."
        else:
            progress.error = f"Error de descarga: {str(e)}"
    except Exception as e:
        progress.status = 'error'
        if "403" in str(e):
            progress.error = "Error de acceso (403). YouTube ha bloqueado la solicitud. Intenta nuevamente en unos minutos."
        else:
            progress.error = f"Error inesperado: {str(e)}"

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/api/downloads', methods=['POST'])
def start_download():
    data = request.get_json()
    url = data.get('url')
    format_type = data.get('format', 'mp4')

    if not url:
        return jsonify({'error': 'URL is required'}), 400

    download_id = str(uuid.uuid4())

    # Start download in background thread
    thread = threading.Thread(target=download_video, args=(url, download_id, format_type))
    thread.daemon = True
    thread.start()

    return jsonify({'download_id': download_id})

@app.route('/api/status/<download_id>')
def get_status(download_id):
    if download_id is None or download_id == 'null' or download_id not in download_status:
        return jsonify({'error': 'Download not found'}), 404

    progress = download_status[download_id]

    response = {
        'status': progress.status,
        'progress': progress.progress,
        'speed': progress.speed,
        'eta': progress.eta,
        'filename': progress.filename,
        'error': progress.error,
        'complete': progress.complete
    }

    return jsonify(response)

@app.route('/api/downloads')
def list_downloads():
    downloads = []
    try:
        for filename in os.listdir(app.config['DOWNLOAD_FOLDER']):
            if filename.endswith(('.mp4', '.mp3', '.webm', '.m4a')):
                file_path = os.path.join(app.config['DOWNLOAD_FOLDER'], filename)
                file_size = os.path.getsize(file_path)
                modified_time = os.path.getmtime(file_path)
                modified_time = datetime.fromtimestamp(modified_time).strftime('%Y-%m-%d %H:%M:%S')

                downloads.append({
                    'filename': filename,
                    'size': file_size,
                    'modified': modified_time,
                    'url': url_for('download_file', filename=filename)
                })
    except Exception as e:
        print(f"Error listing downloads: {e}")

    return jsonify(downloads)

@app.route('/api/ffmpeg/status')
def ffmpeg_status():
    """Verificar el estado de FFmpeg"""
    ffmpeg_available = check_ffmpeg()
    return jsonify({
        'available': ffmpeg_available,
        'can_install': True if not ffmpeg_available else False
    })

@app.route('/api/ffmpeg/install', methods=['POST'])
def install_ffmpeg_api():
    """Intentar instalar FFmpeg automáticamente"""
    try:
        if check_ffmpeg():
            return jsonify({'success': True, 'message': 'FFmpeg ya está disponible.'})

        # Intentar instalar FFmpeg
        success = install_ffmpeg()
        if success:
            return jsonify({'success': True, 'message': 'FFmpeg instalado correctamente.'})
        else:
            return jsonify({'success': False, 'message': 'No se pudo instalar FFmpeg automáticamente. Debes instalarlo manualmente.'})
    except Exception as e:
        return jsonify({'success': False, 'message': f'Error durante la instalación: {str(e)}'}), 500

@app.route('/api/cleanup', methods=['POST'])
def cleanup_downloads():
    """Limpia descargas fallidas y muy antiguas"""
    try:
        cleaned_files = []
        current_time = time.time()

        # Limpiar archivos temporales (menores de 1KB y más antiguos de 1 hora)
        for filename in os.listdir(app.config['DOWNLOAD_FOLDER']):
            file_path = os.path.join(app.config['DOWNLOAD_FOLDER'], filename)

            if os.path.isfile(file_path):
                file_size = os.path.getsize(file_path)
                file_age = current_time - os.path.getmtime(file_path)

                # Eliminar archivos muy pequeños o muy antiguos
                if (file_size < 1024 and file_age > 3600) or file_age > 86400 * 7:  # 7 días
                    os.remove(file_path)
                    cleaned_files.append(filename)

        # Limpiar estados de descarga antiguos
        to_remove = []
        for download_id, progress in download_status.items():
            if progress.complete or progress.status == 'error':
                to_remove.append(download_id)

        for download_id in to_remove:
            del download_status[download_id]

        return jsonify({
            'cleaned_files': cleaned_files,
            'cleaned_downloads': len(to_remove)
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/download/<filename>')
def download_file(filename):
    file_path = os.path.join(app.config['DOWNLOAD_FOLDER'], filename)
    if os.path.exists(file_path):
        return send_file(file_path, as_attachment=True)
    return "File not found", 404

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=True)