"""``utils.get_tool`` 在真实仓库目录上的加载行为。"""

from kilostar.utils import get_tool
from kilostar.utils.get_tool import (
    _get_tool_func,
    del_tool_cache,
    load_tools_from_list,
)


def setup_function(_func):
    """每个测试前清空模块级缓存，避免相互影响。"""
    get_tool._tool_cache.clear()


def test_load_existing_tool_via_load_tools_from_list():
    tools = load_tools_from_list(["file_reader"])
    assert len(tools) == 1
    assert tools[0].__name__ == "file_reader"


def test_loader_caches_function():
    f1 = _get_tool_func("file_reader")
    f2 = _get_tool_func("file_reader")
    assert f1 is f2
    assert "file_reader" in get_tool._tool_cache


def test_del_tool_cache_removes_entry():
    _get_tool_func("file_reader")
    assert "file_reader" in get_tool._tool_cache
    del_tool_cache("file_reader")
    assert "file_reader" not in get_tool._tool_cache


def test_load_unknown_tool_returns_none_and_keeps_others():
    tools = load_tools_from_list(["file_reader", "definitely_not_exist"])
    assert len(tools) == 1
    assert tools[0].__name__ == "file_reader"


def test_load_tools_from_list_handles_none_and_empty():
    assert load_tools_from_list(None) == []
    assert load_tools_from_list([]) == []