import tomllib

import tomli_w

from delta_barth import config


def test_CfgLoader_Init(pth_cfg):
    loader = config.LazyCfgLoader(pth_cfg)

    assert loader.path == pth_cfg
    assert loader._cfg is None


def test_CfgLoader_Get(pth_cfg):
    loader = config.LazyCfgLoader(pth_cfg)

    parsed_cfg = loader.get()
    assert isinstance(parsed_cfg, config.Config)
    assert parsed_cfg.forecast.threshold_month_data_points == 28


def test_CfgLoader_Reload(pth_cfg):
    loader = config.LazyCfgLoader(pth_cfg)

    parsed_cfg = loader.get()
    assert isinstance(parsed_cfg, config.Config)
    assert parsed_cfg.forecast.threshold_month_data_points == 28
    # modify config and reload
    with open(pth_cfg, "rb") as file:
        cfg_data = tomllib.load(file)
    cfg_data["forecast"]["threshold_month_data_points"] = 30
    with open(pth_cfg, "wb") as file:
        tomli_w.dump(cfg_data, file)

    assert parsed_cfg.forecast.threshold_month_data_points == 28
    loader.reload()
    parsed_cfg = loader.get()
    assert isinstance(parsed_cfg, config.Config)
    assert parsed_cfg.forecast.threshold_month_data_points == 30