"""Tests for lock_store.

We verify our own logic: the _redis_available guard and which portalocker
backend is selected. We trust portalocker to handle actual locking mechanics.
"""

from __future__ import annotations

import sys
from unittest import mock

import pytest

import crewai_core.lock_store as lock_store
from crewai_core.lock_store import lock


@pytest.fixture(autouse=True)
def no_redis_url(monkeypatch):
    monkeypatch.setattr(lock_store, "_REDIS_URL", None)


# ---------------------------------------------------------------------------
# _redis_available
# ---------------------------------------------------------------------------


def test_redis_not_available_without_url():
    assert lock_store._redis_available() is False


def test_redis_not_available_when_package_missing(monkeypatch):
    monkeypatch.setattr(lock_store, "_REDIS_URL", "redis://localhost:6379")
    monkeypatch.setitem(sys.modules, "redis", None)  # None → ImportError on import
    assert lock_store._redis_available() is False


def test_redis_available_with_url_and_package(monkeypatch):
    monkeypatch.setattr(lock_store, "_REDIS_URL", "redis://localhost:6379")
    monkeypatch.setitem(sys.modules, "redis", mock.MagicMock())
    assert lock_store._redis_available() is True


# ---------------------------------------------------------------------------
# lock strategy selection
# ---------------------------------------------------------------------------


def test_uses_file_lock_when_redis_unavailable():
    with mock.patch("portalocker.Lock") as mock_lock:
        with lock("file_test"):
            pass

    mock_lock.assert_called_once()
    assert "crewai:" in mock_lock.call_args.args[0]


def test_uses_redis_lock_when_redis_available(monkeypatch):
    fake_conn = mock.MagicMock()
    monkeypatch.setattr(lock_store, "_redis_available", mock.Mock(return_value=True))
    monkeypatch.setattr(lock_store, "_redis_connection", mock.Mock(return_value=fake_conn))

    with mock.patch("portalocker.RedisLock") as mock_redis_lock:
        with lock("redis_test"):
            pass

    mock_redis_lock.assert_called_once()
    kwargs = mock_redis_lock.call_args.kwargs
    assert kwargs["channel"].startswith("crewai:")
    assert kwargs["connection"] is fake_conn