import pytest
from cq2_sdk.lua_bridge.runtime import LuaRuntime, get_runtime, DEFAULT_LUA_PATH


def test_lua_eval_arithmetic():
    rt = LuaRuntime()
    assert rt.eval("1 + 2") == 3


def test_lua_call_global_function():
    rt = LuaRuntime()
    rt.execute("function double(x) return x * 2 end")
    assert rt.call("double", 21) == 42


def test_get_runtime_returns_singleton():
    a = get_runtime()
    b = get_runtime()
    assert a is b


def test_default_path_from_env(monkeypatch):
    monkeypatch.setenv("CQ2_LUA_PATH", "/custom/path")
    rt = LuaRuntime()
    assert rt.lua_path == "/custom/path"


def test_default_path_constant():
    assert DEFAULT_LUA_PATH == r"D:\ProgramFiles\996box\GameBoxDownload\1\cq\assets"