"""
Test script for the Gradio Virtual Try-On app
This script helps verify the app structure without requiring GPU
"""

import sys
import importlib.util

def test_imports():
    """Test if all required packages can be imported"""
    print("🔍 Testing imports...")
    
    required_packages = [
        'gradio',
        'PIL',
        'torch',
        'diffusers',
        'transformers'
    ]
    
    missing_packages = []
    
    for package in required_packages:
        try:
            if package == 'PIL':
                __import__('PIL')
            else:
                __import__(package)
            print(f"  ✅ {package}")
        except ImportError:
            print(f"  ❌ {package} - NOT FOUND")
            missing_packages.append(package)
    
    if missing_packages:
        print(f"\n⚠️  Missing packages: {', '.join(missing_packages)}")
        print("Run: pip install -r requirements.txt")
        return False
    else:
        print("\n✅ All required packages are installed!")
        return True

def test_app_structure():
    """Test if app.py has correct structure"""
    print("\n🔍 Testing app.py structure...")
    
    try:
        with open('app.py', 'r', encoding='utf-8') as f:
            content = f.read()
        
        checks = {
            'import gradio': 'gradio imported',
            '@spaces.GPU': 'ZeroGPU decorator present',
            'def virtual_tryon': 'virtual_tryon function defined',
            'gr.Blocks': 'Gradio Blocks interface',
            'demo.launch': 'App launch configured'
        }
        
        all_passed = True
        for check, description in checks.items():
            if check in content:
                print(f"  ✅ {description}")
            else:
                print(f"  ❌ {description} - NOT FOUND")
                all_passed = False
        
        if all_passed:
            print("\n✅ App structure looks good!")
        else:
            print("\n⚠️  Some checks failed. Review app.py")
        
        return all_passed
        
    except FileNotFoundError:
        print("  ❌ app.py not found!")
        return False

def test_readme():
    """Test if README.md has correct frontmatter"""
    print("\n🔍 Testing README.md...")
    
    try:
        with open('README.md', 'r', encoding='utf-8') as f:
            content = f.read()
        
        if content.startswith('---'):
            frontmatter = content.split('---')[1]
            
            checks = {
                'sdk: gradio': 'Gradio SDK specified',
                'sdk_version': 'SDK version specified',
                'app_file: app.py': 'App file specified'
            }
            
            all_passed = True
            for check, description in checks.items():
                if check in frontmatter:
                    print(f"  ✅ {description}")
                else:
                    print(f"  ❌ {description} - NOT FOUND")
                    all_passed = False
            
            if all_passed:
                print("\n✅ README.md frontmatter is correct!")
            else:
                print("\n⚠️  README.md frontmatter needs fixes")
            
            return all_passed
        else:
            print("  ❌ README.md missing frontmatter!")
            return False
            
    except FileNotFoundError:
        print("  ❌ README.md not found!")
        return False

def test_requirements():
    """Test if requirements.txt exists and has necessary packages"""
    print("\n🔍 Testing requirements.txt...")
    
    try:
        with open('requirements.txt', 'r', encoding='utf-8') as f:
            requirements = f.read()
        
        required = ['gradio', 'torch', 'diffusers', 'spaces']
        
        all_present = True
        for package in required:
            if package in requirements:
                print(f"  ✅ {package}")
            else:
                print(f"  ❌ {package} - NOT FOUND")
                all_present = False
        
        if all_present:
            print("\n✅ requirements.txt looks good!")
        else:
            print("\n⚠️  Some required packages missing from requirements.txt")
        
        return all_present
        
    except FileNotFoundError:
        print("  ❌ requirements.txt not found!")
        return False

def main():
    """Run all tests"""
    print("=" * 60)
    print("Virtual Try-On App - Pre-Deployment Tests")
    print("=" * 60)
    
    results = []
    
    # Run tests
    results.append(("Imports", test_imports()))
    results.append(("App Structure", test_app_structure()))
    results.append(("README", test_readme()))
    results.append(("Requirements", test_requirements()))
    
    # Summary
    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("\n🎉 All tests passed! Ready to deploy to Hugging Face!")
        print("\nNext steps:")
        print("1. Create a new Space on Hugging Face")
        print("2. Choose 'Gradio' as SDK")
        print("3. Select 'ZeroGPU' as hardware")
        print("4. Upload: app.py, requirements.txt, README.md")
        print("5. Wait for build to complete")
        print("\nSee DEPLOYMENT.md for detailed instructions.")
        return 0
    else:
        print("\n⚠️  Some tests failed. Please fix the issues above.")
        return 1

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