"""
Command Line Interface for GreggRecognition
"""

import argparse
import os
import sys
from pathlib import Path
from typing import List

from .recognizer import GreggRecognition

def parse_args():
    """Parse command line arguments"""
    parser = argparse.ArgumentParser(
        description="Recognize Gregg shorthand from images",
        formatter_class=argparse.ArgumentDefaultsHelpFormatter
    )
    
    parser.add_argument(
        "input",
        help="Input image file or directory containing images"
    )
    
    parser.add_argument(
        "--model",
        choices=["image_to_text", "seq2seq"],
        default="image_to_text",
        help="Model type to use for recognition"
    )
    
    parser.add_argument(
        "--model-path",
        help="Path to custom model weights file"
    )
    
    parser.add_argument(
        "--output",
        help="Output file to save results (default: print to stdout)"
    )
    
    parser.add_argument(
        "--device",
        choices=["auto", "cpu", "cuda"],
        default="auto",
        help="Device to use for inference"
    )
    
    parser.add_argument(
        "--batch-size",
        type=int,
        default=8,
        help="Batch size for processing multiple images"
    )
    
    parser.add_argument(
        "--beam-size",
        type=int,
        default=1,
        help="Beam size for beam search (image_to_text model only)"
    )
    
    parser.add_argument(
        "--temperature",
        type=float,
        default=1.0,
        help="Temperature for sampling (seq2seq model only)"
    )
    
    parser.add_argument(
        "--extensions",
        nargs="+",
        default=[".jpg", ".jpeg", ".png", ".bmp", ".tiff"],
        help="Image file extensions to process when input is a directory"
    )
    
    parser.add_argument(
        "--verbose",
        action="store_true",
        help="Enable verbose output"
    )
    
    return parser.parse_args()

def find_image_files(input_path: str, extensions: List[str]) -> List[str]:
    """Find all image files in a directory"""
    input_path = Path(input_path)
    
    if input_path.is_file():
        return [str(input_path)]
    
    elif input_path.is_dir():
        image_files = []
        for ext in extensions:
            pattern = f"*{ext.lower()}"
            image_files.extend(input_path.glob(pattern))
            pattern = f"*{ext.upper()}"
            image_files.extend(input_path.glob(pattern))
        
        return [str(f) for f in sorted(set(image_files))]
    
    else:
        raise FileNotFoundError(f"Input path does not exist: {input_path}")

def main():
    """Main CLI function"""
    args = parse_args()
    
    try:
        # Find input files
        image_files = find_image_files(args.input, args.extensions)
        
        if not image_files:
            print(f"No image files found in: {args.input}")
            sys.exit(1)
        
        if args.verbose:
            print(f"Found {len(image_files)} image file(s)")
            print(f"Using model: {args.model}")
            print(f"Device: {args.device}")
        
        # Initialize recognizer
        recognizer = GreggRecognition(
            model_type=args.model,
            device=args.device,
            model_path=args.model_path
        )
        
        if args.verbose:
            model_info = recognizer.get_model_info()
            print(f"Model parameters: {model_info['num_parameters']:,}")
        
        # Process images
        if len(image_files) == 1:
            # Single image
            result = recognizer.recognize(
                image_files[0],
                beam_size=args.beam_size,
                temperature=args.temperature
            )
            results = [(image_files[0], result)]
        else:
            # Multiple images
            if args.verbose:
                print(f"Processing {len(image_files)} images...")
            
            recognized_texts = recognizer.batch_recognize(
                image_files,
                batch_size=args.batch_size,
                beam_size=args.beam_size,
                temperature=args.temperature
            )
            results = list(zip(image_files, recognized_texts))
        
        # Output results
        if args.output:
            # Write to file
            with open(args.output, 'w', encoding='utf-8') as f:
                for image_path, text in results:
                    f.write(f"{image_path}\t{text}\n")
            
            if args.verbose:
                print(f"Results saved to: {args.output}")
        else:
            # Print to stdout
            for image_path, text in results:
                if len(image_files) == 1:
                    print(text)
                else:
                    print(f"{os.path.basename(image_path)}: {text}")
    
    except Exception as e:
        print(f"Error: {str(e)}", file=sys.stderr)
        sys.exit(1)

if __name__ == "__main__":
    main()