using System;
using System.Runtime.InteropServices;
using RGB.NET.Core;
using RGB.NET.Devices.Corsair.Native;

namespace RGB.NET.Devices.Corsair
{
    /// <inheritdoc />
    /// <summary>
    /// Represents the update-queue performing updates for corsair devices.
    /// </summary>
    public class CorsairDeviceUpdateQueue : UpdateQueue
    {
        #region Properties & Fields

        private int _deviceIndex;

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="CorsairDeviceUpdateQueue"/> class.
        /// </summary>
        /// <param name="updateTrigger">The update trigger used by this queue.</param>
        /// <param name="deviceIndex">The index used to identify the device.</param>
        public CorsairDeviceUpdateQueue(IDeviceUpdateTrigger updateTrigger, int deviceIndex)
            : base(updateTrigger)
        {
            this._deviceIndex = deviceIndex;
        }

        #endregion

        #region Methods

        /// <inheritdoc />
        protected override void Update(in ReadOnlySpan<(object key, Color color)> dataSet)
        {
            int structSize = Marshal.SizeOf(typeof(_CorsairLedColor));
            IntPtr ptr = Marshal.AllocHGlobal(structSize * dataSet.Length);
            IntPtr addPtr = new(ptr.ToInt64());
            foreach ((object key, Color color) in dataSet)
            {
                _CorsairLedColor corsairColor = new()
                {
                    ledId = (int)key,
                    r = color.GetR(),
                    g = color.GetG(),
                    b = color.GetB()
                };

                Marshal.StructureToPtr(corsairColor, addPtr, false);
                addPtr = new IntPtr(addPtr.ToInt64() + structSize);
            }

            _CUESDK.CorsairSetLedsColorsBufferByDeviceIndex(_deviceIndex, dataSet.Length, ptr);
            _CUESDK.CorsairSetLedsColorsFlushBuffer();
            Marshal.FreeHGlobal(ptr);
        }

        #endregion
    }
}