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using Ryujinx.Common.Logging;
using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Ipc;
using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Memory;
using System;
using System.Collections.Generic;

namespace Ryujinx.HLE.HOS.Services.Irs
{
    class IIrSensorServer : IpcService
    {
        private Dictionary<int, ServiceProcessRequest> _commands;

        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;

        private KSharedMemory _irsSharedMem;

        public IIrSensorServer(KSharedMemory irsSharedMem)
        {
            _commands = new Dictionary<int, ServiceProcessRequest>
            {
                { 302, ActivateIrsensor              },
                { 303, DeactivateIrsensor            },
                { 304, GetIrsensorSharedMemoryHandle },
                { 311, GetNpadIrCameraHandle         }
            };

            _irsSharedMem = irsSharedMem;
        }

        // ActivateIrsensor(nn::applet::AppletResourceUserId, pid)
        public long ActivateIrsensor(ServiceCtx context)
        {
            long appletResourceUserId = context.RequestData.ReadInt64();

            Logger.PrintStub(LogClass.ServiceIrs, new { appletResourceUserId });

            return 0;
        }

        // DeactivateIrsensor(nn::applet::AppletResourceUserId, pid)
        public long DeactivateIrsensor(ServiceCtx context)
        {
            long appletResourceUserId = context.RequestData.ReadInt64();

            Logger.PrintStub(LogClass.ServiceIrs, new { appletResourceUserId });

            return 0;
        }

        // GetIrsensorSharedMemoryHandle(nn::applet::AppletResourceUserId, pid) -> handle<copy>
        public long GetIrsensorSharedMemoryHandle(ServiceCtx context)
        {
            var handleTable = context.Process.HandleTable;

            if (handleTable.GenerateHandle(_irsSharedMem, out int handle) != KernelResult.Success)
            {
                throw new InvalidOperationException("Out of handles!");
            }

            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle);

            return 0;
        }

        // GetNpadIrCameraHandle(u32) -> nn::irsensor::IrCameraHandle
        public long GetNpadIrCameraHandle(ServiceCtx context)
        {
            uint npadId = context.RequestData.ReadUInt32();

            if (npadId >= 8 && npadId != 16 && npadId != 32)
            {
                return ErrorCode.MakeError(ErrorModule.Hid, 0x2c5);
            }

            if (((1 << (int)npadId) & 0x1000100FF) == 0)
            {
                return ErrorCode.MakeError(ErrorModule.Hid, 0x2c5);
            }

            int npadTypeId = GetNpadTypeId(npadId);

            context.ResponseData.Write(npadTypeId);

            return 0;
        }

        private int GetNpadTypeId(uint npadId)
        {
            switch(npadId)
            {
                case 0:  return 0;
                case 1:  return 1;
                case 2:  return 2;
                case 3:  return 3;
                case 4:  return 4;
                case 5:  return 5;
                case 6:  return 6;
                case 7:  return 7;
                case 32: return 8;
                case 16: return 9;
                default: throw new ArgumentOutOfRangeException(nameof(npadId));
            }
        }
    }
}