import Foundation

public struct RatedEnvelope<Rating>: Equatable, Sendable {
  public var maximum: Double
  public var minimum: Double
  public var rated: Double
  
  public init(
    maximum: Double,
    minimum: Double,
    rated: Double
  ) {
    self.maximum = maximum
    self.minimum = minimum
    self.rated = rated
  }
}

// MARK: - Namespaces
public enum StaticPressure { }
public enum AirflowPerTon { }
public enum AirflowLimits { }

// MARK: - Static Pressures
public typealias RatedStaticPressures = RatedEnvelope<StaticPressure>
extension RatedStaticPressures {
  public init() {
    self.init(maximum: 0.8, minimum: 0.3, rated: 0.5)
  }
}

// MARK: - Airflow Per Ton
public typealias RatedAirflowPerTon = RatedEnvelope<AirflowPerTon>
extension RatedAirflowPerTon {
  public init() {
    self.init(maximum: 500, minimum: 350, rated: 400)
  }
}

// MARK: - Airflow Limits
public typealias RatedAirflowLimits = RatedEnvelope<AirflowLimits>
extension RatedAirflowLimits {
  public init(
    tons: EquipmentMetadata.CoolingCapacity,
    airflowPerTon: RatedAirflowPerTon = .init()
  ) {
    self.init(
      maximum: airflowPerTon.maximum * tons.rawValue,
      minimum: airflowPerTon.minimum * tons.rawValue,
      rated: airflowPerTon.rated * tons.rawValue
    )
  }
}