Model/backend/onboarders/mappings/as_built_roof_classifiers.py

from backend.onboarders.epc_descriptions import EpcConstructionAgeBand, EpcRoofDescriptions


def classify_flat_roof(age_band: EpcConstructionAgeBand) -> EpcRoofDescriptions:
    """
    For a flat, as built roof, these are the breakdowns:

    2023 onwards               → Flat, insulated
    2003–2022                  → Flat, insulated
    1983–2002                  → Flat, insulated
    1976–1982                  → Flat, limited insulation
    1967–1975                  → Flat, limited insulation
    1950–1966 and earlier      → Flat, no insulation
    :param age_band: Input age band
    :return: EpcRoofDescriptions
    """

    year = age_band.start_year()

    if year >= 1983:
        return EpcRoofDescriptions.flat_insulated

    if year >= 1967:
        return EpcRoofDescriptions.flat_limited_insulation

    return EpcRoofDescriptions.flat_no_insulation


def classify_sloping_ceiling_roof(age_band: EpcConstructionAgeBand) -> EpcRoofDescriptions:
    """
    For a sloping ceiling, as built roof, these are the breakdowns:
    2023 onwards               → Sloping pitched, insulated
    2003–2022                  → Sloping pitched, insulated
    1983–2002                  → Sloping pitched, insulated
    1976–1982                  → Sloping pitched, limited insulation
    1967–1975 and earlier      → Sloping pitched, no insulation
    :param age_band: Input age band
    :return: EpcRoofDescriptions
    """
    year = age_band.start_year()

    if year >= 1983:
        return EpcRoofDescriptions.sloping_pitched_insulated

    if year >= 1976:
        return EpcRoofDescriptions.sloping_pitched_limited_insulation

    return EpcRoofDescriptions.sloping_pitched_no_insulation


AS_BUILT_ROOF_CLASSIFIERS = {
    # Only need to apply this to flat and sloping ceiling roofs
    "Flat": classify_flat_roof,
    "PitchedWithSlopingCeiling": classify_sloping_ceiling_roof,
}