#!/usr/bin/env python3
"""Install this self-contained skill without Git history, runtime data or dependencies."""
import argparse
from datetime import datetime
import os
from pathlib import Path
import shutil
import tempfile


def main():
    parser=argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--source',default=str(Path(__file__).resolve().parents[1]))
    parser.add_argument('--destination')
    parser.add_argument('--update',action='store_true')
    args=parser.parse_args()
    source=Path(args.source).resolve()
    base=Path(os.environ.get('CODEX_HOME',str(Path.home()/'.codex')))
    target=Path(args.destination).expanduser().resolve() if args.destination else (base/'skills/project-agent-control').resolve()
    if not (source/'SKILL.md').is_file() or target==source or source.is_relative_to(target):
        raise ValueError('Invalid source or destination')
    if target.is_symlink():
        raise ValueError('Refusing to replace a symlink')
    if target.exists() and not args.update:
        raise ValueError('Destination exists; inspect it before using --update')
    target.parent.mkdir(parents=True,exist_ok=True)
    stage=Path(tempfile.mkdtemp(prefix='.agent-workbench-',dir=str(target.parent)))
    keep=('SKILL.md','README.md','LICENSE','agents','references','scripts','examples','agent_control','assets')
    ignore=shutil.ignore_patterns('node_modules','__pycache__','*.pyc','.git','.env','*.local.json')
    for name in keep:
        item=source/name
        if item.is_dir():
            shutil.copytree(item,stage/name,ignore=ignore)
        elif item.is_file():
            shutil.copy2(item,stage/name)
    if target.exists():
        backup=target.with_name(target.name+'.backup-'+datetime.now().strftime('%Y%m%d%H%M%S'))
        if backup.exists():
            raise ValueError('Backup destination exists')
        os.replace(target,backup)
    os.replace(stage,target)
    print(str(target))


if __name__=='__main__':main()