import pytest
from cq2_sdk.lua_bridge.runtime import LuaRuntime
from cq2_sdk.lua_bridge.loader import LuaLoader, MissingLuaModule


@pytest.fixture
def fake_lua_path(tmp_path):
    """Create a small fake Lua module tree in a temp dir."""
    (tmp_path / "encode_util.lua").write_text(
        'local M = {}\nM.encode6bit = function(s) return s .. "_enc" end\nreturn M\n'
    )
    (tmp_path / "sub").mkdir()
    (tmp_path / "sub" / "helper.lua").write_text(
        'return {hi = function() return "hi" end}\n'
    )
    return str(tmp_path)


def test_load_simple_module(fake_lua_path):
    rt = LuaRuntime(lua_path=fake_lua_path)
    loader = LuaLoader(rt, fake_lua_path)
    assert loader.load_module("encode_util") is True


def test_load_nested_module(fake_lua_path):
    rt = LuaRuntime(lua_path=fake_lua_path)
    loader = LuaLoader(rt, fake_lua_path)
    assert loader.load_module("sub.helper") is True


def test_load_missing_module_returns_false(fake_lua_path):
    rt = LuaRuntime(lua_path=fake_lua_path)
    loader = LuaLoader(rt, fake_lua_path)
    assert loader.load_module("does_not_exist") is False


def test_list_modules(fake_lua_path):
    rt = LuaRuntime(lua_path=fake_lua_path)
    loader = LuaLoader(rt, fake_lua_path)
    mods = loader.list_modules()
    assert "encode_util" in mods
    assert "sub/helper" in mods


def test_verify_required_missing(fake_lua_path):
    rt = LuaRuntime(lua_path=fake_lua_path)
    loader = LuaLoader(rt, fake_lua_path)
    missing = loader.verify_required(["encode_util", "does_not_exist"])
    assert "does_not_exist" in missing
    assert "encode_util" not in missing


def test_list_modules_empty_dir(tmp_path):
    rt = LuaRuntime(lua_path=str(tmp_path))
    loader = LuaLoader(rt, str(tmp_path))
    assert loader.list_modules() == []