from dataclasses import field

import pytest

from scgenerator.variableparameters import Variable, vdataclass, vfield


def test_vfield_identification():
    """only vfields and not normal fields count"""

    class Conf:
        x: int

    with pytest.warns(UserWarning):
        vdataclass(Conf)

    @vdataclass
    class Conf2:
        x: Variable = vfield(default=5)

    assert hasattr(Conf2, "filter")


def test_constant():
    """classes with constant fields don't increase size and always return the constant"""

    @vdataclass
    class Conf:
        x: Variable = vfield(default=3)
        y: Variable = vfield(default=4)

    conf = Conf()
    assert len(conf) == 1
    assert conf.x(0) == 3
    assert conf.y(0) == 4

    with pytest.raises(ValueError):
        conf.x(1)
    with pytest.raises(ValueError):
        conf.y(1)


def test_decoration():
    """proper construction of the class"""


def test_name_error():
    """name errors are raised when accessing inexistent variable (direct, filter, ...)"""


def test_defaults():
    """default values are respected, of proper type and of size one"""


def test_formatting():
    """formatting is always respected"""


def test_param_parsing():
    """parsing a string or path returns the correct values"""


def test_config_parsing():
    """parsing a string returns the exact id corresponding to the string/path"""