import Dependencies
import Logging
import PsychrometricClient
import Routes

public extension Routes.Psychrometrics.Request {

  func respond(logger: Logger) async throws -> Psychrometrics.Response {
    @Dependency(\.psychrometricClient) var psychrometricClient
    try validate()
    let properties = try await psychrometricClient.psychrometricProperties(
      .dryBulb(.fahrenheit(temperature), relativeHumidity: humidity%, altitude: .feet(altitude ?? 0))
    )
    var warnings = [String]()
    if altitude == nil || altitude == 0 {
      warnings.append(
        "Calculations based on altitude of sea level - set project altitude for higher accuracy."
      )
    }

    return .init(properties: properties, warnings: warnings)
  }

  private func validate() throws {
    guard temperature > 0 else {
      throw ValidationError(message: "Temperature should be greater than 0.")
    }
    guard humidity > 0, humidity <= 100 else {
      throw ValidationError(message: "Relative humidity should be greater than 0 and less than or equal to 100.")
    }
    if let altitude, altitude < 0 {
      throw ValidationError(message: "Altitude should be greater than 0.")
    }
  }

}