public enum ProposedKWInterpolation {
  public struct Request: Codable, Equatable, Sendable {

    public let elevation: Int?

    // These are required if also doing a heat pump heating interpolation.
    public let winterDesignTemperature: Int?
    public let climateType: SystemType.ClimateType?
    public let capacity: Capacity.HeatPumpHeating?

    public let heatLoss: Int
    public let proposedKW: Int

    public init(
      elevation: Int? = nil,
      winterDesignTemperature: Int? = nil,
      climateType: SystemType.ClimateType? = nil,
      capacity: Capacity.HeatPumpHeating? = nil,
      heatLoss: Int,
      proposedKW: Int
    ) {
      self.elevation = elevation
      self.winterDesignTemperature = winterDesignTemperature
      self.climateType = climateType
      self.capacity = capacity
      self.heatLoss = heatLoss
      self.proposedKW = proposedKW
    }
  }

  public struct Response: Codable, Equatable, Sendable {

    public let failed: Bool
    public let failures: [String]?
    public let supplementalHeatRequired: Int
    public let capacityAsPercentOfLoad: Int
    public let oversizingLimit: Int

    // These are if a heat pump interpolation is also done.
    public let altitudeAdjustmentMultiplier: Double?
    public let balancePointTemperature: Int?
    public let capacityAtDesign: Int?
    public let finalCapacity: Capacity.HeatPumpHeating?

    public init(
      failures: [String]? = nil,
      supplementalHeatRequired: Int,
      capacityAsPercentOfLoad: Int,
      oversizingLimit: Int,
      altitudeAdjustmentMultiplier: Double? = nil,
      balancePointTemperature: Int? = nil,
      capacityAtDesign: Int? = nil,
      finalCapacity: Capacity.HeatPumpHeating? = nil
    ) {
      self.failed = failures == nil ? false : !failures!.isEmpty
      self.failures = failures
      self.supplementalHeatRequired = supplementalHeatRequired
      self.capacityAsPercentOfLoad = capacityAsPercentOfLoad
      self.oversizingLimit = oversizingLimit
      self.altitudeAdjustmentMultiplier = altitudeAdjustmentMultiplier
      self.balancePointTemperature = balancePointTemperature
      self.capacityAtDesign = capacityAtDesign
      self.finalCapacity = finalCapacity
    }
  }
}