#!/usr/bin/env python3
"""Test script to verify the complete transcript extraction fallback chain"""

import asyncio
import sys
from pathlib import Path

# Add project to path
sys.path.insert(0, str(Path(__file__).parent))

from backend.services.transcript_service import TranscriptService
from backend.services.service_factory import ServiceFactory
from backend.core.config import settings

async def test_fallback_chain():
    """Test the complete fallback chain with a real YouTube video"""
    
    # Ensure we're using real services
    print(f"USE_MOCK_SERVICES: {settings.USE_MOCK_SERVICES}")
    print(f"ENABLE_REAL_TRANSCRIPT_EXTRACTION: {settings.ENABLE_REAL_TRANSCRIPT_EXTRACTION}")
    
    # Create transcript service with real dependencies
    transcript_service = ServiceFactory.create_transcript_service()
    
    # Test video ID (Rick Astley - Never Gonna Give You Up)
    video_id = "dQw4w9WgXcQ"
    
    print(f"\n{'='*60}")
    print(f"Testing fallback chain for video: {video_id}")
    print(f"{'='*60}\n")
    
    try:
        result = await transcript_service.extract_transcript(video_id, "en")
        
        if result.success:
            print(f"✅ Success! Method used: {result.method}")
            print(f"   Transcript length: {len(result.transcript) if result.transcript else 0} characters")
            print(f"   From cache: {result.from_cache}")
            
            if result.transcript:
                # Show first 200 characters of transcript
                preview = result.transcript[:200] + "..." if len(result.transcript) > 200 else result.transcript
                print(f"\n   Preview: {preview}")
                
            if result.metadata:
                print(f"\n   Metadata:")
                print(f"   - Word count: {result.metadata.word_count}")
                print(f"   - Language: {result.metadata.language}")
                print(f"   - Has timestamps: {result.metadata.has_timestamps}")
                print(f"   - Extraction method: {result.metadata.extraction_method}")
                
        else:
            print(f"❌ Failed to extract transcript")
            if result.error:
                print(f"   Error: {result.error}")
                
    except Exception as e:
        print(f"❌ Exception during extraction: {e}")
        import traceback
        traceback.print_exc()
    
    print(f"\n{'='*60}")
    print("Fallback chain methods available:")
    print("1. YouTube Transcript API (youtube-transcript-api)")
    print("2. Auto-generated Captions") 
    print("3. Whisper Audio Transcription")
    print("4. PyTubeFix (alternative YouTube library)")
    print("5. YT-DLP (robust downloader)")
    print("6. Playwright (browser automation)")
    print("7. External Tools")
    print("8. Web Services")
    print("9. Transcript Only (final fallback)")
    print(f"{'='*60}\n")

if __name__ == "__main__":
    asyncio.run(test_fallback_chain())