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* Copyright (c) 2019, Nordic Semiconductor
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* 1. Redistributions of source code must retain the above copyright notice, this
*    list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this
*    list of conditions and the following disclaimer in the documentation and/or
*    other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may
*    be used to endorse or promote products derived from this software without
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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import Foundation

public struct LightHSLHueSet: AcknowledgedGenericMessage, TransactionMessage, TransitionMessage {
    public static var opCode: UInt32 = 0x826F
    public static var responseType: StaticMeshMessage.Type = LightHSLHueStatus.self
    
    public var tid: UInt8!
    public var parameters: Data? {
        let data = Data() + hue + tid
        if let transitionTime = transitionTime, let delay = delay {
            return data + transitionTime.rawValue + delay
        } else {
            return data
        }
    }
    
    /// The present value of the Light HSL Hue state.
    public let hue: UInt16
    
    public let transitionTime: TransitionTime?
    public let delay: UInt8?
    
    /// Creates the Light HSL Hue Set message.
    ///
    /// Hue is representing by 16-bit unasigned integer of a 0-360 degree scale
    /// using the formula:
    ///
    /// H (degrees) = 360 * hue / 65536
    ///
    /// - parameters:
    ///   - hue: The target value of the Light HSL Hue state.
    public init(hue: UInt16) {
        self.hue = hue
        self.transitionTime = nil
        self.delay = nil
    }
    
    /// Creates the Light HSL Hue Set message.
    ///
    /// Hue is representing by 16-bit unasigned integer of a 0-360 degree scale
    /// using the formula:
    ///
    /// H (degrees) = 360 * hue / 65536
    ///
    /// - parameters:
    ///   - hue: The target value of the Light HSL Hue state.
    ///   - transitionTime: The time that an element will take to transition
    ///                     to the target state from the present state.
    ///   - delay: Message execution delay in 5 millisecond steps.
    public init(hue: UInt16, transitionTime: TransitionTime, delay: UInt8) {
        self.hue = hue
        self.transitionTime = transitionTime
        self.delay = delay
    }
    
    public init?(parameters: Data) {
        guard parameters.count == 3 || parameters.count == 5 else {
            return nil
        }
        hue = parameters.read()
        tid = parameters[2]
        if parameters.count == 5 {
            transitionTime = TransitionTime(rawValue: parameters[3])
            delay = parameters[4]
        } else {
            transitionTime = nil
            delay = nil
        }
    }
    
}
