from corrlib import tools as tl
from configparser import ConfigParser
import os
from pathlib import Path


def test_m2k() -> None:
    for m in [0.1, 0.5, 1.0]:
        expected_k = 1 / (2 * m + 8)
        assert tl.m2k(m) == expected_k


def test_k2m() -> None:
    for m in [0.1, 0.5, 1.0]:
        assert tl.k2m(m) == (1/(2*m))-4


def test_k2m_m2k() -> None:
    for m in [0.1, 0.5, 1.0]:
        k = tl.m2k(m)
        m_converted = tl.k2m(k)
        assert abs(m - m_converted) < 1e-9


def test_str2list() -> None:
    assert tl.str2list("a,b,c") == ["a", "b", "c"]
    assert tl.str2list("1,2,3") == ["1", "2", "3"]


def test_list2str() -> None:
    assert tl.list2str(["a", "b", "c"]) == "a,b,c"
    assert tl.list2str(["1", "2", "3"]) == "1,2,3"


def test_set_config(tmp_path: Path) -> None:
    section = "core"
    option = "test_option"
    value = "test_value"
    # config is not yet available
    tl.set_config(tmp_path, section, option, value)
    config_path = os.path.join(tmp_path, '.corrlib')
    config = ConfigParser()
    config.read(config_path)
    assert config.get('core', 'test_option', fallback="not the value") == "test_value"
    # now, a config file is already present
    section = "core"
    option = "test_option2"
    value = "test_value2"
    tl.set_config(tmp_path, section, option, value)
    config_path = os.path.join(tmp_path, '.corrlib')
    config = ConfigParser()
    config.read(config_path)
    assert config.get('core', 'test_option2', fallback="not the value") == "test_value2"
    # update option 2
    section = "core"
    option = "test_option2"
    value = "test_value3"
    tl.set_config(tmp_path, section, option, value)
    config_path = os.path.join(tmp_path, '.corrlib')
    config = ConfigParser()
    config.read(config_path)
    assert config.get('core', 'test_option2', fallback="not the value") == "test_value3"


def test_get_db_file(tmp_path: Path) -> None:
    section = "paths"
    option = "db"
    value = "test_value"
    # config is not yet available
    tl.set_config(tmp_path, section, option, value)
    assert tl.get_db_file(tmp_path) == "test_value"


def test_cache_enabled(tmp_path: Path) -> None:
    section = "core"
    option = "cached"
    value = "True"
    # config is not yet available
    tl.set_config(tmp_path, section, option, value)
    assert tl.get_db_file(tmp_path)