# ucc_py/__main__.py

import argparse
import sys
from pathlib import Path

# Placeholder for future core logic imports
# from .core import scanner, counter, metrics, differ, outputs

def main():
    """
    Main entry point for the ucc-py CLI application.
    """
    parser = argparse.ArgumentParser(
        description="A Python tool to replicate and enhance UCC functionalities."
    )

    parser.add_argument(
        "baseline_dirs",
        metavar="DIR",
        nargs="*",
        type=Path,
        help="One (for analysis) or two (for diff) directories to process."
    )

    parser.add_argument(
        "--gui",
        action="store_true",
        help="Launch the graphical user interface (Tkinter)."
    )

    parser.add_argument(
        "--outdir",
        type=Path,
        default=Path("./ucc_py_output"),
        help="Directory to store output reports."
    )

    args = parser.parse_args()

    # If user asked for GUI, or no positional directories were provided, launch GUI and exit
    if args.gui or len(args.baseline_dirs) == 0:
        try:
            from .gui.gui import run_app
        except Exception as e:
            print(f"Errore avviando la GUI: {e}", file=sys.stderr)
            sys.exit(1)
        run_app()
        return

    # --- Argument Validation for CLI mode ---

    if len(args.baseline_dirs) > 2:
        print("Error: Maximum of two baseline directories are supported.", file=sys.stderr)
        sys.exit(1)

    for directory in args.baseline_dirs:
        if not directory.is_dir():
            print(f"Error: Path '{directory}' is not a valid directory.", file=sys.stderr)
            sys.exit(1)

    # --- Execution Logic (Placeholder) ---
    print(f"Starting analysis for: {[str(d) for d in args.baseline_dirs]}")
    print(f"Output will be saved to: {args.outdir}")

    # Ensure output directory exists
    args.outdir.mkdir(parents=True, exist_ok=True)
    
    # In the next steps, we will call the core modules from here.
    # For example:
    # file_list_a = scanner.scan_directory(args.baseline_dirs[0])
    # if len(args.baseline_dirs) > 1:
    #     file_list_b = scanner.scan_directory(args.baseline_dirs[1])
    #     # ... and so on

if __name__ == "__main__":
    main()