using LibHac;
using LibHac.Bcat;
using LibHac.Common;
using Ryujinx.Common;

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

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

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

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

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

            return (ResultCode)result.Value;
        }

        [CommandHipc(1)]
        // Read(u64) -> (u64, buffer<bytes, 6>)
        public ResultCode Read(ServiceCtx context)
        {
            ulong bufferAddress = context.Request.ReceiveBuff[0].Position;
            ulong bufferLen = context.Request.ReceiveBuff[0].Size;

            long offset = context.RequestData.ReadInt64();

            using (var region = context.Memory.GetWritableRegion(bufferAddress, (int)bufferLen, true))
            {
                Result result = _base.Get.Read(out long bytesRead, offset, region.Memory.Span);

                context.ResponseData.Write(bytesRead);

                return (ResultCode)result.Value;
            }
        }

        [CommandHipc(2)]
        // GetSize() -> u64
        public ResultCode GetSize(ServiceCtx context)
        {
            Result result = _base.Get.GetSize(out long size);

            context.ResponseData.Write(size);

            return (ResultCode)result.Value;
        }

        [CommandHipc(3)]
        // GetDigest() -> nn::bcat::Digest
        public ResultCode GetDigest(ServiceCtx context)
        {
            Result result = _base.Get.GetDigest(out Digest digest);

            context.ResponseData.WriteStruct(digest);

            return (ResultCode)result.Value;
        }
    }
}