TempTrack-iOS/TempTrack/Temperature/TemperatureValue.swift

import Foundation

enum TemperatureValue {
    case notFound
    case invalidMeasurement
    case value(Double)
    
    init(byte: UInt8) {
        switch byte {
        case 0:
            self = .notFound
        case 1:
            self = .invalidMeasurement
        default:
            self = .value(Double(byte) * 0.5 - 40)
        }
    }
    
    var byte: UInt8 {
        switch self {
        case .notFound:
            return 0
        case .invalidMeasurement:
            return 1
        case .value(let double):
            let value = (double * 2).roundedInt + 80
            return UInt8(clamping: value)
        }
    }
    
    var optionalValue: Double? {
        if case .value(let val) = self {
            return val
        }
        return nil
    }
    
    var isValid: Bool {
        if case .value = self {
            return true
        }
        return false
    }
    
    var text: String {
        switch self {
        case .notFound:
            return "-"
        case .invalidMeasurement:
            return "?"
        case .value(let value):
            return String(format:"%.1f°", value)
        }
    }
}

extension TemperatureValue: Codable {
    
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        let byte = try container.decode(UInt8.self)
        self.init(byte: byte)
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        try container.encode(byte)
    }
    
}