using Ryujinx.Common.Memory;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.Common;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.DebugPad;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.Keyboard;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.Mouse;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.Npad;
using Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory.TouchScreen;
using System;
using System.Runtime.InteropServices;

namespace Ryujinx.HLE.HOS.Services.Hid.Types.SharedMemory
{
    /// <summary>
    /// Represent the shared memory shared between applications for input.
    /// </summary>
    [StructLayout(LayoutKind.Explicit, Size = 0x40000)]
    struct SharedMemory
    {
        /// <summary>
        /// Debug controller.
        /// </summary>
        [FieldOffset(0)]
        public RingLifo<DebugPadState> DebugPad;

        /// <summary>
        /// Touchscreen.
        /// </summary>
        [FieldOffset(0x400)]
        public RingLifo<TouchScreenState> TouchScreen;

        /// <summary>
        /// Mouse.
        /// </summary>
        [FieldOffset(0x3400)]
        public RingLifo<MouseState> Mouse;

        /// <summary>
        /// Keyboard.
        /// </summary>
        [FieldOffset(0x3800)]
        public RingLifo<KeyboardState> Keyboard;

        /// <summary>
        /// Nintendo Pads.
        /// </summary>
        [FieldOffset(0x9A00)]
        public Array10<NpadState> Npads;

        public static SharedMemory Create()
        {
            SharedMemory result = new()
            {
                DebugPad = RingLifo<DebugPadState>.Create(),
                TouchScreen = RingLifo<TouchScreenState>.Create(),
                Mouse = RingLifo<MouseState>.Create(),
                Keyboard = RingLifo<KeyboardState>.Create(),
            };
            
            Span<NpadState> npadsSpan = result.Npads.AsSpan();

            for (int i = 0; i < npadsSpan.Length; i++)
            {
                npadsSpan[i] = NpadState.Create();
            }

            return result;
        }
    }
}
