public enum HeatingBalancePoint {

  public static let description: String = """
  Calculate the heating balance point.
  """

  public enum Mode: String, CaseIterable, Codable, Equatable, Sendable {
    case economic
    case thermal
  }

  public enum Request: Codable, Equatable, Sendable {
    case thermal(Thermal)

    public struct Thermal: Codable, Equatable, Sendable {

      public let systemSize: Double
      public let capacityAt47: Double?
      public let capacityAt17: Double?
      public let heatingDesignTemperature: Double
      public let buildingHeatLoss: HeatingBalancePoint.HeatLoss

      public init(
        systemSize: Double,
        capacityAt47: Double? = nil,
        capacityAt17: Double? = nil,
        heatingDesignTemperature: Double,
        buildingHeatLoss: HeatingBalancePoint.HeatLoss
      ) {
        self.systemSize = systemSize
        self.capacityAt47 = capacityAt47
        self.capacityAt17 = capacityAt17
        self.heatingDesignTemperature = heatingDesignTemperature
        self.buildingHeatLoss = buildingHeatLoss
      }
    }
  }

  public enum Response: Codable, Equatable, Sendable {
    case thermal(Thermal)

    public struct Thermal: Codable, Equatable, Sendable {

      public let capacityAt47: Double
      public let capacityAt17: Double
      public let balancePointTemperature: Double

      public init(capacityAt47: Double, capacityAt17: Double, balancePointTemperature: Double) {
        self.capacityAt47 = capacityAt47
        self.capacityAt17 = capacityAt17
        self.balancePointTemperature = balancePointTemperature
      }
    }
  }

  public enum HeatLoss: Codable, Equatable, Sendable {

    public enum Mode: String, CaseIterable, Codable, Equatable, Sendable {
      case estimated
      case known
    }

    case known(btu: Double)
    case estimated(squareFeet: Double)
  }
}