#!/usr/bin/env python3
"""Create directory and symlink for Copilot skills."""

import argparse
import subprocess
import sys
from pathlib import Path


def add_skill(markdown_path: str) -> None:
    """Add a skill by creating symlink in ~/.copilot/skills/.

    Args:
        markdown_path: Path to the markdown file (relative or absolute)

    Raises:
        FileNotFoundError: If markdown file doesn't exist
        RuntimeError: If symlink creation fails
    """
    md_file = Path(markdown_path)

    if not md_file.exists():
        raise FileNotFoundError(f"Markdown file not found: {markdown_path}")

    # Get absolute path
    abs_md_path = md_file.resolve()

    # Extract skill name from filename (without .md extension)
    skill_name = md_file.stem

    # Create skill directory
    skills_dir = Path.home() / ".copilot" / "skills" / skill_name
    skills_dir.mkdir(parents=True, exist_ok=True)

    # Create symlink
    symlink_path = skills_dir / "SKILL.md"

    # Remove existing symlink if it exists
    if symlink_path.exists() or symlink_path.is_symlink():
        symlink_path.unlink()

    # Create the symlink using ln -s for compatibility
    result = subprocess.run(
        ["ln", "-s", str(abs_md_path), str(symlink_path)],
        capture_output=True,
        check=False,
        text=True,
    )

    if result.returncode != 0:
        raise RuntimeError(f"Failed to create symlink: {result.stderr}")

    print(f"✓ Created skill link: {symlink_path} -> {abs_md_path}")


def main() -> None:
    """Main entry point."""
    parser = argparse.ArgumentParser(description="Create directory and symlink for Copilot skills")
    subparsers = parser.add_subparsers(dest="command", help="Command to run")

    # Add subcommand
    add_parser = subparsers.add_parser("add", help="Add a skill")
    add_parser.add_argument("markdown", help="Path to markdown skill file")

    args = parser.parse_args()

    if not args.command:
        parser.print_help()
        sys.exit(1)

    if args.command == "add":
        try:
            add_skill(args.markdown)
        except (FileNotFoundError, RuntimeError, OSError) as e:
            print(f"✗ Error: {e}", file=sys.stderr)
            sys.exit(1)


if __name__ == "__main__":
    main()