import pytest

from pigeon_magnet_solver.helpers import (_fix_exes, _rotate_r, _valid_rotate,
                                          rotate_r)


@pytest.mark.parametrize("test_input,expected", [
    # trivial cases
    ("1111", "1111"),
    ("0000", "0000"),
    ("xxxx", "xxxx"),

    # interesting case "1x01"
    ("1x01", "11x0"),
    ("11x0", "011x"),
    ("011x", "x011"),
    ("x011", "1x01"),
])
def test__rotate_r(test_input: str, expected: str):
    assert _rotate_r(list(test_input)) == list(expected)


@pytest.mark.parametrize("test_input,candidate,expected", [
    # interesting case "1x01"
    ("1x01", "11x0", False),
    ("1x01", "011x", False),
    ("1x01", "x011", True),
    ("1x01", "1x01", True),
])
def test__valid_rotate(test_input: str, candidate: str, expected: bool):
    assert _valid_rotate(list(test_input), list(candidate)) is expected


def test__fix_exes():
    assert _fix_exes(list("1x01"), list("x011")) == list("0x11")


@pytest.mark.parametrize("test_input,expected", [
    # trivial cases
    ("1111", "1111"),
    ("0000", "0000"),
    ("xxxx", "xxxx"),

    # fixpoints "1x10"
    ("1x10", "1x10"),
    ("101x", "101x"),
    ("1x1x", "1x1x"),

    # alternating case "1010"
    ("1010", "0101"),
    ("0101", "1010"),

    # interesting case "1x01"
    ("1x01", "0x11"),
    ("0x11", "1x01"),
])
def test_rotate_r(test_input: str, expected: str):
    assert rotate_r(list(test_input)) == list(expected)