"""Behaviour of the wall Recommendation Generator: detecting a treatable
wall and emitting a Recommendation whose Measure Option carries the
Simulation Overlay for the intervention. See CONTEXT.md / ADR-0016.
"""

from datatypes.epc.domain.epc_property_data import (
    BuildingPartIdentifier,
    EpcPropertyData,
    SapBuildingPart,
)
from domain.modelling.scoring.overlay_applicator import apply_simulations
from domain.modelling.product import Product
from domain.modelling.recommendation import Recommendation
from domain.modelling.generators.wall_recommendation import recommend_cavity_wall
from domain.modelling.generators.solid_wall_recommendation import recommend_solid_wall
from repositories.product.product_repository import ProductRepository
from tests.domain.sap10_calculator.worksheet._elmhurst_worksheet_000490 import (
    build_epc,
)


class _StubProducts(ProductRepository):
    """In-memory ProductRepository returning a fixed cavity Product."""

    def get(self, measure_type: str) -> Product:
        return Product(
            measure_type=measure_type, unit_cost_per_m2=18.5, contingency_rate=0.10
        )


def _part(epc: EpcPropertyData, identifier: BuildingPartIdentifier) -> SapBuildingPart:
    return next(p for p in epc.sap_building_parts if p.identifier is identifier)


def test_uninsulated_main_cavity_wall_yields_a_cavity_fill_recommendation() -> None:
    # Arrange
    baseline: EpcPropertyData = build_epc()  # MAIN: cavity (4), uninsulated (4)

    # Act
    recommendation: Recommendation | None = recommend_cavity_wall(baseline, _StubProducts())

    # Assert
    assert recommendation is not None
    assert recommendation.surface == "Main wall"
    assert len(recommendation.options) == 1
    option = recommendation.options[0]
    assert option.measure_type == "cavity_wall_insulation"
    simulated: EpcPropertyData = apply_simulations(baseline, [option.overlay])
    assert _part(simulated, BuildingPartIdentifier.MAIN).wall_insulation_type == 2


def test_already_insulated_main_wall_yields_no_recommendation() -> None:
    # Arrange
    baseline: EpcPropertyData = build_epc()
    _part(baseline, BuildingPartIdentifier.MAIN).wall_insulation_type = 2  # filled

    # Act
    recommendation: Recommendation | None = recommend_cavity_wall(baseline, _StubProducts())

    # Assert
    assert recommendation is None


def test_cavity_option_carries_fully_loaded_cost_from_area_and_product() -> None:
    # Arrange
    baseline: EpcPropertyData = build_epc()  # MAIN gross heat-loss area 45.93 m^2
    products = _StubProducts()  # cavity 18.5 GBP/m^2, contingency 0.10

    # Act
    recommendation: Recommendation | None = recommend_cavity_wall(baseline, products)

    # Assert
    assert recommendation is not None
    cost = recommendation.options[0].cost
    assert cost is not None
    assert abs(cost.total - 45.93 * 18.5) <= 0.01
    assert abs(cost.contingency_rate - 0.10) <= 1e-9


def test_non_cavity_main_wall_yields_no_recommendation() -> None:
    # Arrange
    baseline: EpcPropertyData = build_epc()
    main: SapBuildingPart = _part(baseline, BuildingPartIdentifier.MAIN)
    main.wall_construction = 2  # solid (not cavity); still uninsulated

    # Act
    recommendation: Recommendation | None = recommend_cavity_wall(baseline, _StubProducts())

    # Assert
    assert recommendation is None


def test_park_home_wall_yields_no_solid_wall_recommendation() -> None:
    # Arrange — a park home (wall_construction code 8) with an uninsulated
    # as-built wall. Code 8 is NOT system-built (ADR-0019); a park home's
    # proprietary panel is never EWI/IWI-suitable, so the generator excludes it.
    baseline: EpcPropertyData = build_epc()
    main: SapBuildingPart = _part(baseline, BuildingPartIdentifier.MAIN)
    main.wall_construction = 8
    main.wall_insulation_type = 4  # as-built / uninsulated — the trigger

    # Act
    recommendation: Recommendation | None = recommend_solid_wall(
        baseline, _StubProducts()
    )

    # Assert
    assert recommendation is None