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import Foundation

public struct SensorSettingSet: AcknowledgedSensorPropertyMessage {
    public static let opCode: UInt32 = 0x59
    public static let responseType: StaticMeshMessage.Type = SensorSettingStatus.self
    
    public let property: DeviceProperty
    /// Setting Property identifying a setting within a sensor.
    public let settingProperty: DeviceProperty
    /// The value of the setting.
    public let settingValue: DevicePropertyCharacteristic
    
    public var parameters: Data? {
        return Data() + property.id + settingProperty.id + settingValue.data
    }
    
    /// Creates the Sensor Setting Set message.
    ///
    /// - parameters:
    ///   - setting:  Setting Property identifying a setting within a sensor.
    ///   - property: Property identifying a sensor.
    ///   - value:    The value of the setting.
    public init(_ setting: DeviceProperty, of property: DeviceProperty,
                to value: DevicePropertyCharacteristic) {
        self.property = property
        self.settingProperty = setting
        self.settingValue = value
    }
    
    public init?(parameters: Data) {
        guard parameters.count >= 5 else {
            return nil
        }
        let propertyId: UInt16 = parameters.read(fromOffset: 0)
        self.property = DeviceProperty(propertyId)
        
        let settingPropertyId: UInt16 = parameters.read(fromOffset: 2)
        self.settingProperty = DeviceProperty(settingPropertyId)
        
        // For known properties, make sure we have enough of data to parse value from.
        if let expectedValueLength = settingProperty.valueLength {
            guard expectedValueLength == parameters.count - 4 else {
                return nil
            }
        }
        self.settingValue = settingProperty.read(from: parameters, at: 4, length: parameters.count - 4)
    }
    
}
