import os

import pytest

from lock_manager import LockAcquisitionError, acquire_lock, release_lock


def test_acquire_lock_creates_file_with_pid(tmp_path):
    lock_path = tmp_path / ".lock"

    acquire_lock(lock_path, pid_checker=lambda pid: True)

    assert lock_path.exists()
    assert lock_path.read_text(encoding="utf-8").strip() == str(os.getpid())


def test_acquire_lock_raises_when_existing_pid_running(tmp_path):
    lock_path = tmp_path / ".lock"
    lock_path.write_text("12345", encoding="utf-8")

    with pytest.raises(LockAcquisitionError):
        acquire_lock(lock_path, pid_checker=lambda pid: True)


def test_acquire_lock_replaces_stale_lock(tmp_path):
    lock_path = tmp_path / ".lock"
    lock_path.write_text("12345", encoding="utf-8")

    acquire_lock(lock_path, pid_checker=lambda pid: False)

    assert lock_path.read_text(encoding="utf-8").strip() == str(os.getpid())


def test_release_lock_removes_file(tmp_path):
    lock_path = tmp_path / ".lock"
    lock_path.write_text("12345", encoding="utf-8")

    release_lock(lock_path)

    assert not lock_path.exists()


def test_release_lock_missing_file_no_error(tmp_path):
    lock_path = tmp_path / ".lock"

    release_lock(lock_path)  # 例外が出ないことを確認するだけ