// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable UnusedMember.Global

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

namespace RGB.NET.Devices.Corsair
{
    /// <inheritdoc cref="CorsairRGBDevice{TDeviceInfo}" />
    /// <summary>
    /// Represents a corsair custom.
    /// </summary>
    public class CorsairCustomRGBDevice : CorsairRGBDevice<CorsairCustomRGBDeviceInfo>, IUnknownDevice
    {
        #region Constructors

        /// <inheritdoc />
        /// <summary>
        /// Initializes a new instance of the <see cref="T:RGB.NET.Devices.Corsair.CorsairCustomRGBDevice" /> class.
        /// </summary>
        /// <param name="info">The specific information provided by CUE for the custom-device.</param>
        internal CorsairCustomRGBDevice(CorsairCustomRGBDeviceInfo info, CorsairDeviceUpdateQueue updateQueue)
            : base(info, new LedMapping<CorsairLedId>(), updateQueue)
        { }

        #endregion

        #region Methods

        /// <inheritdoc />
        protected override void InitializeLayout()
        {
            Mapping.Clear();

            _CorsairLedPositions? nativeLedPositions = (_CorsairLedPositions?)Marshal.PtrToStructure(_CUESDK.CorsairGetLedPositionsByDeviceIndex(DeviceInfo.CorsairDeviceIndex), typeof(_CorsairLedPositions));
            if (nativeLedPositions == null) return;

            int structSize = Marshal.SizeOf(typeof(_CorsairLedPosition));
            IntPtr ptr = new(nativeLedPositions.pLedPosition.ToInt64() + (structSize * DeviceInfo.LedOffset));

            LedId referenceLedId = GetReferenceLed(DeviceInfo.DeviceType);
            for (int i = 0; i < DeviceInfo.LedCount; i++)
            {
                LedId ledId = referenceLedId + i;
                _CorsairLedPosition? ledPosition = (_CorsairLedPosition?)Marshal.PtrToStructure(ptr, typeof(_CorsairLedPosition));
                if (ledPosition == null)
                {
                    ptr = new IntPtr(ptr.ToInt64() + structSize);
                    continue;
                }

                Mapping.Add(ledId, ledPosition.LedId);

                Rectangle rectangle = ledPosition.ToRectangle();
                AddLed(ledId, rectangle.Location, rectangle.Size);

                ptr = new IntPtr(ptr.ToInt64() + structSize);
            }
        }

        private static LedId GetReferenceLed(RGBDeviceType deviceType)
            => deviceType switch
            {
                RGBDeviceType.LedStripe => LedId.LedStripe1,
                RGBDeviceType.Fan => LedId.Fan1,
                RGBDeviceType.Cooler => LedId.Cooler1,
                _ => LedId.Custom1
            };

        #endregion
    }
}