import pytest
from hypothesis import assume, given
from hypothesis import strategies as st

from roll.roll import Roll


@given(st.integers(max_value=0))
def test_bad_dice_count(n: int):
    with pytest.raises(ValueError):
        Roll(n, 20)


@given(st.integers(max_value=1))
def test_bad_sides(sides: int):
    with pytest.raises(ValueError):
        Roll(1, sides)


@given(
    st.integers(min_value=1),
    st.integers(min_value=2),
    st.integers(),
)
def test_valid_dice(n: int, sides: int, modifier: int):
    string = f"{n}d{sides}{modifier:+}" if modifier else f"{n}d{sides}"
    roll = Roll(n, sides, modifier)
    roll_from_str = Roll.from_str(string)
    assert roll == roll_from_str
    assert string == roll.to_str() and string == roll_from_str.to_str()


@pytest.mark.parametrize(
    ("roll", "expected"),
    [(Roll(1, 20), "1d20"), (Roll(2, 20, 3), "2d20+3"), (Roll(4, 6, -3), "4d6-3")],
)
def test_str_roundtrip(roll: Roll, expected: str):
    assert roll.to_str() == expected
    assert Roll.from_str(expected) == roll


@pytest.mark.parametrize("roll", ["d90", "0d0", "-1d-1", "aba", "000", "1d1d1d"])
def test_from_bad_str(roll: str):
    with pytest.raises(ValueError):
        Roll.from_str(roll)


@given(
    st.integers(min_value=1),
    st.integers(min_value=2),
    st.integers(),
    st.integers(),
)
def test_modify(n: int, sides: int, modifier: int, new_modifier: int):
    assume(modifier != new_modifier)
    roll = Roll(n, sides, modifier)
    modified_roll = roll.modify(new_modifier)
    assert modified_roll == Roll(n, sides, new_modifier)
    assert modified_roll is not roll and modified_roll != roll


@given(st.integers(min_value=1, max_value=50_000), st.integers(min_value=2))
def test_throw(n: int, sides: int):
    roll = Roll(n, sides)
    throw = roll.throw()
    assert len(throw.results) == n
    assert all(1 <= result <= sides for result in throw.results)