using LibHac;
using LibHac.Bcat;
using LibHac.Common;
using Ryujinx.Common;
using System.Runtime.InteropServices;

namespace Ryujinx.HLE.HOS.Services.Bcat.ServiceCreator
{
    class IDeliveryCacheDirectoryService : DisposableIpcService
    {
        private SharedRef<LibHac.Bcat.Impl.Ipc.IDeliveryCacheDirectoryService> _base;

        public IDeliveryCacheDirectoryService(ref SharedRef<LibHac.Bcat.Impl.Ipc.IDeliveryCacheDirectoryService> baseService)
        {
            _base = SharedRef<LibHac.Bcat.Impl.Ipc.IDeliveryCacheDirectoryService>.CreateMove(ref baseService);
        }

        protected override void Dispose(bool isDisposing)
        {
            if (isDisposing)
            {
                _base.Destroy();
            }
        }

        [CommandCmif(0)]
        // Open(nn::bcat::DirectoryName)
        public ResultCode Open(ServiceCtx context)
        {
            DirectoryName directoryName = context.RequestData.ReadStruct<DirectoryName>();

            Result result = _base.Get.Open(ref directoryName);

            return (ResultCode)result.Value;
        }

        [CommandCmif(1)]
        // Read() -> (u32, buffer<nn::bcat::DeliveryCacheDirectoryEntry, 6>)
        public ResultCode Read(ServiceCtx context)
        {
            ulong bufferAddress = context.Request.ReceiveBuff[0].Position;
            ulong bufferLen = context.Request.ReceiveBuff[0].Size;

            using (var region = context.Memory.GetWritableRegion(bufferAddress, (int)bufferLen, true))
            {
                Result result = _base.Get.Read(out int entriesRead, MemoryMarshal.Cast<byte, DeliveryCacheDirectoryEntry>(region.Memory.Span));

                context.ResponseData.Write(entriesRead);

                return (ResultCode)result.Value;
            }
        }

        [CommandCmif(2)]
        // GetCount() -> u32
        public ResultCode GetCount(ServiceCtx context)
        {
            Result result = _base.Get.GetCount(out int count);

            context.ResponseData.Write(count);

            return (ResultCode)result.Value;
        }
    }
}
