from importlib import resources
from pathlib import Path
from typing import Callable

from l4d2host.process import run_command


def ensure_template_unit(target_dir: Path | None = None) -> Path:
    if target_dir is None:
        target_dir = Path.home() / ".config/systemd/user"
    target_dir.mkdir(parents=True, exist_ok=True)
    target_file = target_dir / "l4d2@.service"
    body = resources.files("l4d2host.templates").joinpath("l4d2@.service").read_text()
    target_file.write_text(body)
    return target_file


def daemon_reload(
    *,
    on_stdout: Callable[[str], None] | None = None,
    on_stderr: Callable[[str], None] | None = None,
    passthrough: bool = False,
) -> None:
    run_command(
        ["systemctl", "--user", "daemon-reload"],
        on_stdout=on_stdout,
        on_stderr=on_stderr,
        passthrough=passthrough,
    )