#!/usr/bin/env python3
"""
Script to create .gitignore file from template.

Usage:
    python create_gitignore.py --output /path/to/project
    python create_gitignore.py --output .
"""

import argparse
import os
import shutil
from pathlib import Path


def create_gitignore(output_dir: str) -> None:
    """
    Copy .gitignore template to the specified output directory.

    Args:
        output_dir: Directory where .gitignore should be created
    """
    # Get the directory where this script is located
    script_dir = Path(__file__).parent
    skill_dir = script_dir.parent

    # Path to the template
    template_path = skill_dir / "examples" / ".gitignore-template"

    # Validate template exists
    if not template_path.exists():
        raise FileNotFoundError(
            f"Template not found at: {template_path}\n"
            f"Expected location: .claude/skills/django-setup/examples/.gitignore-template"
        )

    # Create output directory if it doesn't exist
    output_path = Path(output_dir).resolve()
    output_path.mkdir(parents=True, exist_ok=True)

    # Destination path
    gitignore_path = output_path / ".gitignore"

    # Check if .gitignore already exists
    if gitignore_path.exists():
        print(f"⚠️  .gitignore already exists at: {gitignore_path}")
        print("❌ Script should only be used when .gitignore does not exist.")
        print("💡 Use manual merging to add missing entries from the template.")
        exit(1)

    # Copy the template
    shutil.copy2(template_path, gitignore_path)

    print(f"✅ Created .gitignore at: {gitignore_path}")
    print(f"📋 Copied from template: {template_path}")


def main():
    parser = argparse.ArgumentParser(
        description="Create .gitignore file from template for Django projects",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  # Create .gitignore in current directory
  python create_gitignore.py --output .

  # Create .gitignore in specific project directory
  python create_gitignore.py --output /path/to/project

  # Create .gitignore in parent directory
  python create_gitignore.py --output ..
        """
    )

    parser.add_argument(
        '--output',
        type=str,
        required=True,
        help='Directory where .gitignore should be created (e.g., . for current directory)'
    )

    args = parser.parse_args()

    try:
        create_gitignore(args.output)
    except FileNotFoundError as e:
        print(f"❌ Error: {e}")
        exit(1)
    except Exception as e:
        print(f"❌ Unexpected error: {e}")
        exit(1)


if __name__ == "__main__":
    main()