from pathlib import Path
from typing import Callable

from l4d2host.fs.base import OverlayMounter
from l4d2host.process import run_command


class FuseOverlayFSMounter(OverlayMounter):
    def mount(
        self,
        *,
        lowerdirs: str,
        upperdir: Path,
        workdir: Path,
        merged: Path,
        on_stdout: Callable[[str], None] | None = None,
        on_stderr: Callable[[str], None] | None = None,
        passthrough: bool = False,
        should_cancel: Callable[[], bool] | None = None,
    ) -> None:
        run_command(
            [
                "fuse-overlayfs",
                "-o",
                f"lowerdir={lowerdirs},upperdir={upperdir},workdir={workdir}",
                str(merged),
            ],
            on_stdout=on_stdout,
            on_stderr=on_stderr,
            passthrough=passthrough,
            should_cancel=should_cancel,
        )

    def unmount(
        self,
        *,
        merged: Path,
        on_stdout: Callable[[str], None] | None = None,
        on_stderr: Callable[[str], None] | None = None,
        passthrough: bool = False,
        should_cancel: Callable[[], bool] | None = None,
    ) -> None:
        run_command(
            ["fusermount3", "-u", str(merged)],
            on_stdout=on_stdout,
            on_stderr=on_stderr,
            passthrough=passthrough,
            should_cancel=should_cancel,
        )