import CasePaths
import PsychrometricClient
@preconcurrency import URLRouting

public enum Psychrometrics {

  public static let description = """
  Calculate the psychrometric properties of air based on temperature and humidity readings.
  """

  public struct Request: Codable, Equatable, Sendable, Hashable {

    // public let mode: Mode
    public let temperature: Double
    public let humidity: Double
    public let altitude: Double?

    public init(temperature: Double, humidity: Double, altitude: Double? = nil) {
      self.temperature = temperature
      self.humidity = humidity
      self.altitude = altitude
    }

    public enum FieldKey: String {
      case temperature
      case humidity
      case altitude
    }
  }

  public struct Response: Codable, Equatable, Sendable {
    public let properties: PsychrometricProperties
    public let warnings: [String]

    public init(properties: PsychrometricProperties, warnings: [String]) {
      self.properties = properties
      self.warnings = warnings
    }
  }
}

// MARK: - Router

public extension SiteRoute.View {

  enum Psychrometrics: Equatable, Sendable, Hashable {

    case index
    case submit(Routes.Psychrometrics.Request)

    typealias Key = Routes.Psychrometrics.Request.FieldKey
    static let rootPath = "psychrometric-properties"

    public static let router = OneOf {
      Route(.case(Self.index)) {
        Path { rootPath }
        Method.get
      }
      Route(.case(Self.submit)) {
        Path { rootPath }
        Method.post
        Body {
          FormData {
            Field(Key.temperature) {
              Double.parser()
            }
            Field(Key.humidity) {
              Double.parser()
            }
            Optionally {
              Field(Key.altitude) {
                Double.parser()
              }
            }
          }
        }
        .map(.memberwise(Routes.Psychrometrics.Request.init))
      }
    }
  }
}

#if DEBUG
  public extension Psychrometrics.Response {
    static let mock = Self(
      properties: .init(
        absoluteHumidity: 91.4,
        atmosphericPressure: 0.3,
        degreeOfSaturation: 0.66,
        density: 0.07,
        dewPoint: 64.3,
        dryBulb: 76,
        enthalpy: 32.33,
        grainsOfMoisture: 91.4,
        humidityRatio: 0.01,
        relativeHumidity: 67,
        specificVolume: 13.78,
        vaporPressure: 0.3,
        wetBulb: 67.7,
        units: .imperial
      ),
      warnings: [
        "Test warning."
      ]
    )
  }
#endif