#!/usr/bin/env python3
"""Install a vault-local hook that invokes this framework without copying its tools."""

import argparse
import shlex
import subprocess
from pathlib import Path

from vault_root import FRAMEWORK_ROOT, parse_vault_args


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    root = parse_vault_args(parser).vault_root
    repo = subprocess.run(["git", "-C", str(root), "rev-parse", "--show-toplevel"],
                          capture_output=True, text=True)
    if repo.returncode or repo.stdout.strip() != str(root):
        parser.error("vault root must be the Git repository root to install hooks")
    result = subprocess.run(
        ["git", "-C", str(root), "rev-parse", "--path-format=absolute", "--git-path", "hooks"],
        capture_output=True, text=True, check=True,
    )
    hook = Path(result.stdout.strip()) / "pre-commit"
    marker = "# knowledge-base framework hook"
    if hook.exists() or hook.is_symlink():
        legacy = hook.is_symlink() and hook.resolve() in {
            root / "scripts/pre-commit", FRAMEWORK_ROOT / "scripts/pre-commit",
        }
        managed = not hook.is_symlink() and marker in hook.read_text()
        if not legacy and not managed:
            parser.error(f"refusing to replace unmanaged hook: {hook}")
    script = FRAMEWORK_ROOT / "scripts/pre-commit"
    content = f"#!/bin/sh\n{marker}\nexec bash {shlex.quote(str(script))} {shlex.quote(str(root))}\n"
    hook.parent.mkdir(parents=True, exist_ok=True)
    if hook.is_symlink():
        hook.unlink()
    hook.write_text(content)
    hook.chmod(0o755)
    print(f"Installed {hook} -> {script} (vault: {root})")


if __name__ == "__main__":
    main()