import cv2
import requests
import tempfile
import os
from urllib.parse import urlparse, parse_qs
import yt_dlp

class VideoParser:
    def __init__(self):
        self.temp_dir = tempfile.mkdtemp()
    
    def download_youtube_video(self, url: str) -> str:
        """Download YouTube video and return local path"""
        ydl_opts = {
            'format': 'worst[height<=480]/worst',
            'outtmpl': os.path.join(self.temp_dir, '%(title)s.%(ext)s'),
            'quiet': True,
            'no_warnings': True,
            'extract_flat': False,
            'user_agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
        }
        
        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(url, download=True)
            return ydl.prepare_filename(info)
    
    def analyze_video_frames(self, video_path: str, sample_rate: int = 30):
        """Analyze video frames for object detection/counting"""
        cap = cv2.VideoCapture(video_path)
        frame_count = 0
        results = []
        
        while cap.isOpened():
            ret, frame = cap.read()
            if not ret:
                break
                
            if frame_count % sample_rate == 0:
                # Basic frame analysis - you'd integrate with object detection here
                results.append({
                    'frame': frame_count,
                    'timestamp': frame_count / cap.get(cv2.CAP_PROP_FPS),
                    'frame_data': frame
                })
            
            frame_count += 1
        
        cap.release()
        return results
    
    def extract_audio(self, video_path: str) -> str:
        """Extract audio from video for speech analysis"""
        audio_path = video_path.rsplit('.', 1)[0] + '.wav'
        
        # Use ffmpeg to extract audio
        import subprocess
        subprocess.run([
            'ffmpeg', '-i', video_path, '-vn', '-acodec', 'pcm_s16le', 
            '-ar', '16000', '-ac', '1', audio_path, '-y'
        ], capture_output=True)
        
        return audio_path
    
    def get_youtube_metadata(self, url: str) -> dict:
        """Extract YouTube video metadata without downloading"""
        try:
            ydl_opts = {
                'quiet': True,
                'no_download': True,
                'extract_flat': False
            }
            
            with yt_dlp.YoutubeDL(ydl_opts) as ydl:
                info = ydl.extract_info(url, download=False)
                
                return {
                    'title': info.get('title', 'Unknown'),
                    'description': info.get('description', '')[:500],
                    'duration': info.get('duration', 0),
                    'view_count': info.get('view_count', 0),
                    'upload_date': info.get('upload_date', 'Unknown'),
                    'uploader': info.get('uploader', 'Unknown')
                }
                
        except Exception as e:
            return {'error': str(e)}
    
    def cleanup(self):
        """Clean up temporary files"""
        import shutil
        shutil.rmtree(self.temp_dir, ignore_errors=True)