#!/usr/bin/env python3
"""
Backward Compatibility Verification Script

This script verifies that the enhanced config.py maintains 100% backward
compatibility with existing code and API calls.
"""

import sys
import os

def test_imports():
    """Test that all import patterns work"""
    print("=" * 60)
    print("Testing Import Patterns")
    print("=" * 60)
    
    # Test 1: from config import settings
    try:
        from config import settings
        assert hasattr(settings, 'hf_token')
        assert hasattr(settings, 'hf_cache_dir')
        assert hasattr(settings, 'db_path')
        print("✅ 'from config import settings' - PASSED")
    except Exception as e:
        print(f"❌ 'from config import settings' - FAILED: {e}")
        return False
    
    # Test 2: from src.config import settings
    try:
        from src.config import settings
        assert hasattr(settings, 'hf_token')
        assert hasattr(settings, 'hf_cache_dir')
        print("✅ 'from src.config import settings' - PASSED")
    except Exception as e:
        print(f"❌ 'from src.config import settings' - FAILED: {e}")
        return False
    
    # Test 3: from .config import settings (relative import)
    try:
        import src
        from src.config import settings
        assert hasattr(settings, 'hf_token')
        print("✅ Relative import - PASSED")
    except Exception as e:
        print(f"❌ Relative import - FAILED: {e}")
        return False
    
    return True

def test_attributes():
    """Test that all attributes work as expected"""
    print("\n" + "=" * 60)
    print("Testing Attribute Access")
    print("=" * 60)
    
    from config import settings
    
    # Test hf_token
    try:
        token = settings.hf_token
        assert isinstance(token, str)
        print(f"✅ settings.hf_token: {type(token).__name__} - PASSED")
    except Exception as e:
        print(f"❌ settings.hf_token - FAILED: {e}")
        return False
    
    # Test hf_cache_dir
    try:
        cache_dir = settings.hf_cache_dir
        assert isinstance(cache_dir, str)
        assert len(cache_dir) > 0
        print(f"✅ settings.hf_cache_dir: {cache_dir} - PASSED")
    except Exception as e:
        print(f"❌ settings.hf_cache_dir - FAILED: {e}")
        return False
    
    # Test db_path
    try:
        db_path = settings.db_path
        assert isinstance(db_path, str)
        print(f"✅ settings.db_path: {db_path} - PASSED")
    except Exception as e:
        print(f"❌ settings.db_path - FAILED: {e}")
        return False
    
    # Test max_workers
    try:
        max_workers = settings.max_workers
        assert isinstance(max_workers, int)
        assert 1 <= max_workers <= 16
        print(f"✅ settings.max_workers: {max_workers} - PASSED")
    except Exception as e:
        print(f"❌ settings.max_workers - FAILED: {e}")
        return False
    
    # Test all other attributes
    attributes = [
        'cache_ttl', 'faiss_index_path', 'session_timeout',
        'max_session_size_mb', 'mobile_max_tokens', 'mobile_timeout',
        'gradio_port', 'gradio_host', 'log_level', 'log_format',
        'default_model', 'embedding_model', 'classification_model'
    ]
    
    for attr in attributes:
        try:
            value = getattr(settings, attr)
            print(f"✅ settings.{attr}: {type(value).__name__} - PASSED")
        except Exception as e:
            print(f"❌ settings.{attr} - FAILED: {e}")
            return False
    
    return True

def test_context_manager_compatibility():
    """Test that context_manager can import settings"""
    print("\n" + "=" * 60)
    print("Testing Context Manager Compatibility")
    print("=" * 60)
    
    try:
        # Simulate what context_manager does
        from config import settings
        db_path = settings.db_path
        assert isinstance(db_path, str)
        print(f"✅ Context manager import pattern works - PASSED")
        print(f"   db_path: {db_path}")
        return True
    except Exception as e:
        print(f"❌ Context manager compatibility - FAILED: {e}")
        return False

def test_cache_directory():
    """Test cache directory functionality"""
    print("\n" + "=" * 60)
    print("Testing Cache Directory Management")
    print("=" * 60)
    
    try:
        from src.config import settings
        cache_dir = settings.hf_cache_dir
        
        # Verify directory exists
        assert os.path.exists(cache_dir), f"Cache directory does not exist: {cache_dir}"
        print(f"✅ Cache directory exists: {cache_dir}")
        
        # Verify write access
        test_file = os.path.join(cache_dir, ".test_write")
        try:
            with open(test_file, 'w') as f:
                f.write("test")
            os.remove(test_file)
            print(f"✅ Cache directory is writable")
        except PermissionError:
            print(f"⚠️  Cache directory not writable (may need permissions)")
        
        return True
    except Exception as e:
        print(f"❌ Cache directory test - FAILED: {e}")
        return False

def main():
    """Run all compatibility tests"""
    print("Backward Compatibility Verification")
    print("=" * 60)
    print()
    
    results = []
    
    results.append(("Imports", test_imports()))
    results.append(("Attributes", test_attributes()))
    results.append(("Context Manager", test_context_manager_compatibility()))
    results.append(("Cache Directory", test_cache_directory()))
    
    print("\n" + "=" * 60)
    print("Test Summary")
    print("=" * 60)
    
    all_passed = True
    for test_name, passed in results:
        status = "✅ PASSED" if passed else "❌ FAILED"
        print(f"{test_name}: {status}")
        if not passed:
            all_passed = False
    
    print("=" * 60)
    
    if all_passed:
        print("✅ ALL TESTS PASSED - Backward compatibility verified!")
        return 0
    else:
        print("❌ SOME TESTS FAILED - Please review errors above")
        return 1

if __name__ == "__main__":
    sys.exit(main())