#!/usr/bin/env python3
"""Copy a build-tree MFEM prefix into a Meson/meson-python destination."""

from __future__ import annotations

import argparse
import os
from pathlib import Path
import shutil


def staged_destination(destination: Path) -> Path:
    destdir = os.environ.get("DESTDIR", "")
    if not destdir or not destination.is_absolute():
        return destination
    destination_text = os.fspath(destination)
    relative = destination_text[len(destination.anchor) :].lstrip("/\\")
    return Path(destdir) / relative


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--source", type=Path, required=True)
    parser.add_argument("--destination", type=Path, required=True)
    args = parser.parse_args()
    destination = staged_destination(args.destination)
    destination.mkdir(parents=True, exist_ok=True)
    for child in args.source.iterdir():
        target = destination / child.name
        if child.is_dir():
            shutil.copytree(child, target, dirs_exist_ok=True, symlinks=True)
        else:
            shutil.copy2(child, target, follow_symlinks=False)
    print(f"Installed MFEM native bundle to {destination}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())