#!/usr/bin/env python3
"""
CNN Model Training Script
========================

Standalone script to train the CNN deblurring model with comprehensive options.
"""

import os
import sys
import argparse
import logging
from datetime import datetime

# Add modules to path
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from modules.cnn_deblurring import CNNDeblurModel, train_new_model, quick_train, full_train

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler(f'training_log_{datetime.now().strftime("%Y%m%d_%H%M%S")}.log'),
        logging.StreamHandler()
    ]
)

logger = logging.getLogger(__name__)

def main():
    """Main training function with comprehensive options"""
    
    parser = argparse.ArgumentParser(
        description='Train CNN Deblurring Model',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog='''
Examples:
  python train_cnn_model.py --quick              # Quick training (500 samples, 10 epochs)
  python train_cnn_model.py --full               # Full training (2000 samples, 30 epochs)
  python train_cnn_model.py --samples 1500       # Custom samples with default epochs
  python train_cnn_model.py --samples 1000 --epochs 25  # Custom training
  python train_cnn_model.py --test               # Test existing model
        '''
    )
    
    # Training modes
    mode_group = parser.add_mutually_exclusive_group(required=True)
    mode_group.add_argument('--quick', action='store_true', 
                           help='Quick training (500 samples, 10 epochs)')
    mode_group.add_argument('--full', action='store_true',
                           help='Full training (2000 samples, 30 epochs)')
    mode_group.add_argument('--custom', action='store_true',
                           help='Custom training (specify --samples and --epochs)')
    mode_group.add_argument('--test', action='store_true',
                           help='Test existing model performance')
    
    # Training parameters
    parser.add_argument('--samples', type=int, default=1000,
                       help='Number of training samples (default: 1000)')
    parser.add_argument('--epochs', type=int, default=20,
                       help='Number of training epochs (default: 20)')
    parser.add_argument('--batch-size', type=int, default=16,
                       help='Training batch size (default: 16)')
    parser.add_argument('--validation-split', type=float, default=0.2,
                       help='Validation data split (default: 0.2)')
    
    # Model parameters
    parser.add_argument('--image-size', type=int, default=256,
                       help='Input image size (default: 256x256)')
    
    # Data options
    parser.add_argument('--use-existing-dataset', action='store_true', default=True,
                       help='Use existing dataset if available (default: True)')
    parser.add_argument('--force-new-dataset', action='store_true',
                       help='Force creation of new dataset')
    
    args = parser.parse_args()
    
    # Print banner
    print("🎯 CNN Deblurring Model Training")
    print("=" * 40)
    print(f"Timestamp: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
    print()
    
    # Ensure directories exist
    os.makedirs("models", exist_ok=True)
    os.makedirs("data/training_dataset", exist_ok=True)
    
    try:
        if args.test:
            # Test existing model
            print("🧪 Testing Existing Model")
            print("-" * 30)
            
            model = CNNDeblurModel()
            
            if model.load_model(model.model_path):
                print("✅ Successfully loaded trained model")
                
                # Evaluate model
                print("📊 Evaluating model performance...")
                metrics = model.evaluate_model()
                
                if metrics:
                    print("\n📈 Model Performance Metrics:")
                    print(f"   Loss: {metrics['loss']:.4f}")
                    print(f"   Mean Absolute Error: {metrics['mae']:.4f}")
                    print(f"   Mean Squared Error: {metrics['mse']:.4f}")
                    
                    # Performance interpretation
                    if metrics['loss'] < 0.01:
                        print("🌟 Excellent performance!")
                    elif metrics['loss'] < 0.05:
                        print("👍 Good performance")
                    elif metrics['loss'] < 0.1:
                        print("⚠️ Fair performance - consider more training")
                    else:
                        print("🔄 Poor performance - retrain recommended")
                else:
                    print("❌ Failed to evaluate model")
            else:
                print("❌ No trained model found. Train a model first:")
                print("   python train_cnn_model.py --quick")
                return False
                
        elif args.quick:
            # Quick training
            print("🚀 Quick Training Mode")
            print("-" * 30)
            print("Configuration:")
            print(f"   Samples: 500")
            print(f"   Epochs: 10")
            print(f"   Expected time: ~10-15 minutes")
            print()
            
            model = quick_train()
            
        elif args.full:
            # Full training
            print("🚀 Full Training Mode")
            print("-" * 30)
            print("Configuration:")
            print(f"   Samples: 2000")
            print(f"   Epochs: 30")
            print(f"   Expected time: ~45-60 minutes")
            print()
            
            model = full_train()
            
        elif args.custom:
            # Custom training
            print("🚀 Custom Training Mode")
            print("-" * 30)
            print("Configuration:")
            print(f"   Samples: {args.samples}")
            print(f"   Epochs: {args.epochs}")
            print(f"   Batch Size: {args.batch_size}")
            print(f"   Validation Split: {args.validation_split}")
            print(f"   Image Size: {args.image_size}x{args.image_size}")
            print(f"   Use Existing Dataset: {not args.force_new_dataset}")
            
            # Estimate training time
            estimated_minutes = (args.samples * args.epochs) / 1000
            print(f"   Estimated time: ~{estimated_minutes:.1f} minutes")
            print()
            
            # Initialize model with custom parameters
            input_shape = (args.image_size, args.image_size, 3)
            model = CNNDeblurModel(input_shape=input_shape)
            
            # Train with custom parameters
            success = model.train_model(
                epochs=args.epochs,
                batch_size=args.batch_size,
                validation_split=args.validation_split,
                use_existing_dataset=not args.force_new_dataset,
                num_training_samples=args.samples
            )
            
            if success:
                print("✅ Custom training completed successfully!")
                
                # Evaluate model
                metrics = model.evaluate_model()
                if metrics:
                    print(f"📊 Final Model Performance:")
                    print(f"   Loss: {metrics['loss']:.4f}")
                    print(f"   MAE: {metrics['mae']:.4f}")
                    print(f"   MSE: {metrics['mse']:.4f}")
            else:
                print("❌ Custom training failed!")
                return False
        
        # Final message
        if not args.test:
            print("\n🎉 Training Process Completed!")
            print(f"📁 Model saved to: models/cnn_deblur_model.h5")
            print(f"📁 Dataset saved to: data/training_dataset/")
            print(f"📁 Training log: training_log_*.log")
            print("\n🚀 You can now use the trained model in the main application!")
        
        return True
        
    except KeyboardInterrupt:
        print("\n⚠️ Training interrupted by user")
        return False
    except Exception as e:
        logger.error(f"Training failed with error: {e}")
        print(f"\n❌ Training failed: {e}")
        return False

if __name__ == "__main__":
    success = main()
    sys.exit(0 if success else 1)