"""The Landlord-Override glazing → glazing Simulation Overlay mapping.

A glazing value resolves to the SAP10 `glazing_type` code the calculator's
Table-24 cascade reads; the overlay is whole-dwelling (expanded across every
window by `_fold_glazing`).
"""

from __future__ import annotations

import pytest

from domain.epc.property_overrides.glazing_type import GlazingType
from domain.epc.property_overlays.glazing_overlay import glazing_overlay_for
from domain.modelling.scoring.overlay_applicator import apply_simulations
from tests.domain.sap10_calculator.worksheet._elmhurst_worksheet_000490 import (
    build_epc,
)


def test_double_glazing_post_2002_overlays_its_glazing_code() -> None:
    # Act
    simulation = glazing_overlay_for("Double glazing, 2002 or later", 0)

    # Assert — double glazing 2002-2021 is SAP10 glazing_type code 2.
    assert simulation is not None
    assert simulation.glazing is not None
    assert simulation.glazing.glazing_type == 2


@pytest.mark.parametrize(
    ("glazing_value", "code"),
    [
        ("Single glazing", 1),
        ("Double glazing, pre-2002", 3),
        ("Triple glazing, 2002 or later", 9),
        ("Triple glazing, pre-2002", 6),
    ],
)
def test_glazing_types_decode_to_their_sap_codes(
    glazing_value: str, code: int
) -> None:
    # Act
    simulation = glazing_overlay_for(glazing_value, 0)

    # Assert
    assert simulation is not None
    assert simulation.glazing is not None
    assert simulation.glazing.glazing_type == code


def test_secondary_glazing_overlays_its_glazing_code() -> None:
    # Hyde-796 landlords assert "100% secondary glazing (sap 9.94)"; flattening it
    # to Single applies U = 4.8 instead of secondary's 2.9 (Model#1416). The
    # calculator already understands secondary glazing — SAP10 glazing_type code 5
    # (`_GLAZING_CODE_TO_UWINDOW` in heat_transmission).

    # Act
    simulation = glazing_overlay_for("Secondary glazing", 0)

    # Assert
    assert simulation is not None
    assert simulation.glazing is not None
    assert simulation.glazing.glazing_type == 5


@pytest.mark.parametrize("glazing_value", ["Unknown", ""])
def test_unresolvable_glazing_produces_no_overlay(glazing_value: str) -> None:
    # Act
    simulation = glazing_overlay_for(glazing_value, 0)

    # Assert
    assert simulation is None


def test_a_glazing_mix_produces_no_overlay_so_the_cert_is_kept() -> None:
    # A MIXED aggregate resolves to no overlay: a whole-dwelling proportion cannot
    # say which windows are which, so the cert's per-window `sap_windows` are kept
    # rather than flattened to one type (ADR-0042 amendment, #1376).

    # Act
    simulation = glazing_overlay_for(GlazingType.MIXED.value, 0)

    # Assert
    assert simulation is None


def test_glazing_override_remaps_every_window_and_clears_lodged_u() -> None:
    # Arrange — baseline windows are double glazed (code 2, lodged U 2.8); the
    # landlord corrects the whole dwelling to single glazing.
    baseline = build_epc()
    assert len(baseline.sap_windows) > 1
    overlay = glazing_overlay_for("Single glazing", 0)
    assert overlay is not None

    # Act
    result = apply_simulations(baseline, [overlay])

    # Assert — every window flips to single (code 1) and its lodged transmission
    # U is cleared so the Table-24 cascade re-derives U from the new type.
    assert all(w.glazing_type == 1 for w in result.sap_windows)
    assert all(w.window_transmission_details is None for w in result.sap_windows)


_NO_OVERLAY_SENTINELS = {GlazingType.UNKNOWN, GlazingType.MIXED}


@pytest.mark.parametrize(
    "member", [m for m in GlazingType if m not in _NO_OVERLAY_SENTINELS]
)
def test_every_resolvable_glazing_value_decodes_to_a_code(
    member: GlazingType,
) -> None:
    # A classifier emits a GlazingType value; if the overlay can't decode it the
    # override silently no-ops. Every member except the deliberate no-overlay
    # sentinels (UNKNOWN, MIXED) must resolve to a code.

    # Act
    simulation = glazing_overlay_for(member.value, 0)

    # Assert
    assert simulation is not None