from sqlalchemy import Column, BigInteger, String, Float, Boolean, TIMESTAMP, ForeignKey, Enum
from sqlalchemy.orm import declarative_base
from sqlalchemy.sql import func
from backend.app.db.models.portfolio import Portfolio, PropertyModel
from backend.app.db.models.materials import Material
from backend.app.db.models.portfolio import Epc
from datatypes.enums import QuantityUnits
import enum

Base = declarative_base()


class Recommendation(Base):
    __tablename__ = 'recommendation'

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    property_id = Column(BigInteger, ForeignKey(PropertyModel.id), nullable=False)
    created_at = Column(TIMESTAMP, nullable=False, server_default=func.now())
    type = Column(String, nullable=False)
    measure_type = Column(String)
    description = Column(String, nullable=False)
    estimated_cost = Column(Float)
    default = Column(Boolean, nullable=False)
    starting_u_value = Column(Float)
    new_u_value = Column(Float)
    sap_points = Column(Float)
    heat_demand = Column(Float)
    kwh_savings = Column(Float)
    co2_equivalent_savings = Column(Float)
    energy_savings = Column(Float)
    energy_cost_savings = Column(Float)
    property_valuation_increase = Column(Float)
    rental_yield_increase = Column(Float)
    total_work_hours = Column(Float)
    labour_days = Column(Float)
    already_installed = Column(Boolean, nullable=False, default=False)


class RecommendationMaterials(Base):
    __tablename__ = 'recommendation_materials'

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    recommendation_id = Column(BigInteger, ForeignKey('recommendation.id'), nullable=False)
    material_id = Column(BigInteger, ForeignKey(Material.id), nullable=False)
    created_at = Column(TIMESTAMP, nullable=False, server_default=func.now())
    depth = Column(Float, nullable=False)
    quantity = Column(Float, nullable=False)
    quantity_unit = Column(Enum(QuantityUnits, values_callable=lambda x: [e.value for e in x]), nullable=False)
    estimated_cost = Column(Float, nullable=False)


class PlanTypeEnum(enum.Enum):
    SOLAR_ECO4 = "solar_eco4"
    SOLAR_HHRSH_ECO4 = "solar_hhrsh_eco4"
    EMPTY_CAVITY_ECO = "empty_cavity_eco"
    PARTIAL_CAVITY_ECO = "partial_cavity_eco"
    EXTRACTION_ECO = "extraction_eco"


class Plan(Base):
    __tablename__ = 'plan'

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    name = Column(String, nullable=True, default="")
    portfolio_id = Column(BigInteger, ForeignKey(Portfolio.id), nullable=False)
    property_id = Column(BigInteger, ForeignKey(PropertyModel.id), nullable=False)
    scenario_id = Column(BigInteger, ForeignKey('scenario.id'))  # Doesn't have to be linked to a scenario
    created_at = Column(TIMESTAMP, nullable=False, server_default=func.now())
    is_default = Column(Boolean, nullable=False)
    valuation_increase_lower_bound = Column(Float)
    valuation_increase_upper_bound = Column(Float)
    valuation_increase_average = Column(Float)
    plan_type = Column(
        Enum(
            PlanTypeEnum,
            name="plan_type",
            values_callable=lambda e: [m.value for m in e],
            create_type=False,
        ),
        nullable=True,
    )
    post_sap_points = Column(Float)
    post_epc_rating = Column(Enum(Epc))
    post_co2_emissions = Column(Float)
    co2_savings = Column(Float)
    post_energy_bill = Column(Float)
    energy_bill_savings = Column(Float)
    post_energy_consumption = Column(Float)  # energy demand in kWh/year
    energy_consumption_savings = Column(Float)
    valuation_post_retrofit = Column(Float)
    valuation_increase = Column(Float)
    # Financial metrics, excluding funding
    cost_of_works = Column(Float)
    contingency_cost = Column(Float)


class PlanRecommendations(Base):
    __tablename__ = 'plan_recommendations'

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    plan_id = Column(BigInteger, ForeignKey('plan.id'), nullable=False)
    recommendation_id = Column(BigInteger, ForeignKey('recommendation.id'), nullable=False)


class Scenario(Base):
    __tablename__ = 'scenario'

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    name = Column(String, nullable=False)
    created_at = Column(TIMESTAMP, nullable=False, server_default=func.now())
    budget = Column(Float)
    portfolio_id = Column(BigInteger, ForeignKey(Portfolio.id), nullable=False)
    housing_type = Column(String, nullable=False)
    goal = Column(String, nullable=False)
    goal_value = Column(String, nullable=False)
    trigger_file_path = Column(String, nullable=False)
    already_installed_file_path = Column(String)
    patches_file_path = Column(String)
    non_invasive_recommendations_file_path = Column(String)
    exclusions = Column(String)
    multi_plan = Column(Boolean, default=False)
    is_default = Column(Boolean, default=False, nullable=False)

    # Add in the fields we need, which were previously sitting at the portfolio level
    cost = Column(Float)
    contingency = Column(Float)
    funding = Column(Float)
    total_work_hours = Column(Float)
    energy_savings = Column(Float)
    co2_equivalent_savings = Column(Float)
    energy_cost_savings = Column(Float)
    epc_breakdown_pre_retrofit = Column(String)
    epc_breakdown_post_retrofit = Column(String)
    number_of_properties = Column(BigInteger)
    n_units_to_retrofit = Column(BigInteger)
    co2_per_unit_pre_retrofit = Column(String)
    co2_per_unit_post_retrofit = Column(String)
    energy_bill_per_unit_pre_retrofit = Column(String)
    energy_bill_per_unit_post_retrofit = Column(String)
    energy_consumption_per_unit_pre_retrofit = Column(String)
    energy_consumption_per_unit_post_retrofit = Column(String)
    valuation_improvement_per_unit = Column(String)
    cost_per_unit = Column(String)
    cost_per_co2_saved = Column(String)
    cost_per_sap_point = Column(String)
    valuation_return_on_investment = Column(String)
    property_valuation_increase = Column(Float)
    labour_days = Column(Float)


class MeasureType(enum.Enum):
    air_source_heat_pump = "air_source_heat_pump"
    boiler_upgrade = "boiler_upgrade"
    high_heat_retention_storage_heaters = "high_heat_retention_storage_heaters"
    secondary_heating = "secondary_heating"

    roomstat_programmer_trvs = "roomstat_programmer_trvs"
    time_temperature_zone_control = "time_temperature_zone_control"
    cylinder_thermostat = "cylinder_thermostat"

    cavity_wall_insulation = "cavity_wall_insulation"
    extension_cavity_wall_insulation = "extension_cavity_wall_insulation"
    external_wall_insulation = "external_wall_insulation"
    internal_wall_insulation = "internal_wall_insulation"
    loft_insulation = "loft_insulation"
    flat_roof_insulation = "flat_roof_insulation"
    room_roof_insulation = "room_roof_insulation"
    solid_floor_insulation = "solid_floor_insulation"
    suspended_floor_insulation = "suspended_floor_insulation"

    double_glazing = "double_glazing"
    secondary_glazing = "secondary_glazing"
    draught_proofing = "draught_proofing"

    mechanical_ventilation = "mechanical_ventilation"
    low_energy_lighting = "low_energy_lighting"
    solar_pv = "solar_pv"
    hot_water_tank_insulation = "hot_water_tank_insulation"
    sealing_open_fireplace = "sealing_open_fireplace"


class InstalledMeasure(Base):
    __tablename__ = "installed_measure"

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    uprn = Column(BigInteger, nullable=False)
    measure_type = Column(
        Enum(
            MeasureType,
            name="measure_type",
            values_callable=lambda e: [m.value for m in e],
            create_type=False,  # <-- critical
        ),
        nullable=False,
    )
    installed_at = Column(TIMESTAMP)
    sap_points = Column(Float)
    carbon_savings = Column(Float)
    kwh_savings = Column(Float)
    bill_savings = Column(Float)
    heat_demand_savings = Column(Float)
    source = Column(String)
    is_active = Column(Boolean, nullable=False, default=True)