import Models
import Validations

extension RequiredKW.Request {
  func respond() async throws -> RequiredKW.Response {
    try await validate()
    let capacityAtDesign = self.capacityAtDesign ?? 0
    let requiredKW = (Double(heatLoss) - Double(capacityAtDesign)) / 3413
    return .init(requiredKW: requiredKW)
  }
}

extension RequiredKW.Request: AsyncValidatable {

  @inlinable
  public var body: some AsyncValidation<Self> {
    AsyncValidator.accumulating {
      AsyncValidator.greaterThan(\.heatLoss, 0)
      AsyncValidator.validate(\.capacityAtDesign) {
        AsyncValidator.greaterThan(0).optional()
      }
    }
  }
}