from __future__ import annotations

import pytest

from domain.epc.property_overrides.roof_type import RoofType
from domain.epc.property_overrides.roof_party_ceiling_guard import (
    roof_party_ceiling_guard,
)


def test_party_ceiling_marker_with_a_trailing_depth_resolves_to_the_party_ceiling_member() -> None:
    # Arrange — the bug: a party ceiling ("another dwelling above") carrying a
    # trailing loft depth the LLM misreads as an external pitched roof.
    description = "another dwelling above: 100mm"

    # Act
    result = roof_party_ceiling_guard(description)

    # Assert — it is a party ceiling (~0 heat loss), not a Pitched roof.
    assert result is RoofType.ADJACENT_ANOTHER_DWELLING_ABOVE


@pytest.mark.parametrize(
    ("description", "expected"),
    [
        ("same dwelling above: unknown", RoofType.ADJACENT_SAME_DWELLING_ABOVE),
        ("other premises above", RoofType.ADJACENT_OTHER_PREMISES_ABOVE),
        ("another premises above: 150mm", RoofType.ADJACENT_ANOTHER_PREMISES_ABOVE),
        # the unspaced source form and the "Another Premises Above" member value
        # both normalise to the same marker.
        ("Another Premises Above", RoofType.ADJACENT_ANOTHER_PREMISES_ABOVE),
        ("samedwellingabove: 300mm", RoofType.ADJACENT_SAME_DWELLING_ABOVE),
    ],
)
def test_every_party_ceiling_marker_variant_resolves_to_its_member(
    description: str, expected: RoofType
) -> None:
    # Act
    result = roof_party_ceiling_guard(description)

    # Assert
    assert result is expected


@pytest.mark.parametrize(
    "description",
    [
        "pitched, normal loft access: 100mm",
        "flat: 150mm",
        "pitched with sloping ceiling: unknown",
        "roof room(s), insulated",
    ],
)
def test_a_genuine_roof_description_is_left_to_the_llm(description: str) -> None:
    # A non-party-ceiling roof must return None so the LLM classifier still
    # resolves it — the guard only claims the markers it is certain about.

    # Act
    result = roof_party_ceiling_guard(description)

    # Assert
    assert result is None