public struct MoonDetail: Hashable {

    public let julianDay: Double
    /// Number of days elapsed into the synodic cycle, represented as a fraction
    public let daysElapsedInCycle: Double
    /// Age of the moon in days, minutes, hours
    public let ageOfMoon: (days: Int, hours: Int, minutes: Int)
    /// Illuminated portion of the Moon, where 0.0 = new and 0.99 = full
    public let illuminatedFraction: Double
    /// Distance of moon from the center of the Earth, in kilometers
    public let distanceFromCenterOfEarth: Double
    /// Phase of the Moon, represented as a fraction
    ///
    /// Varies between `0.0` to `0.99`.
    /// `0.0` new moon,
    /// `0.25` first quarter,
    /// `0.5` full moon,
    /// `0.75` last quarter
    public let phase: Double
}

public struct Moon: Hashable {

    init() {...}

    // MARK: Public

    /// Represents where the phase is in the current synodic cycle. Varies between `0.0` to `0.99`.
    ///
    /// `0.0` new moon, `0.25` first quarter, `0.5` full moon, `0.75` last
    public let phaseFraction: Double
    /// Illuminated fraction of Moon's disk, between `0.0` and `1.0`.
    ///
    /// `0` indicates a new moon and `1.0` indicates a full moon.
    public let illuminatedFraction: Double
    public let moonPhase: MoonPhase
    public let name: String
    public let emoji: String
    public let date: Date
    /// Returns `0` if the current `date` is a full moon
    public var daysTillFullMoon: Int
    /// Returns `0` if the current `date` is a new moon
    public var daysTillNewMoon: Int
    public var moonDetail: TinyMoon.MoonDetail

    public var fullMoonName: String? {
      if isFullMoon() {
        let calendar = Calendar.current
        let components = calendar.dateComponents([.month], from: date)
        if let month = components.month {
          return fullMoonName(month: month)
        }
      }
      return nil
    }

    public func isFullMoon() -> Bool {
      switch moonPhase {
      case .fullMoon: true
      default: false
      }
    }
}