/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/UnionTypes.h"
#include "mozilla/dom/WebGPUBinding.h"
#include "CommandEncoder.h"

#include "CommandBuffer.h"
#include "Buffer.h"
#include "ComputePassEncoder.h"
#include "Device.h"
#include "RenderPassEncoder.h"
#include "Utility.h"
#include "mozilla/webgpu/CanvasContext.h"
#include "mozilla/webgpu/ffi/wgpu.h"
#include "ipc/WebGPUChild.h"

namespace mozilla::webgpu {

GPU_IMPL_CYCLE_COLLECTION(CommandEncoder, mParent, mBridge)
GPU_IMPL_JS_WRAP(CommandEncoder)

void CommandEncoder::ConvertTextureDataLayoutToFFI(
    const dom::GPUImageDataLayout& aLayout,
    ffi::WGPUImageDataLayout* aLayoutFFI) {
  *aLayoutFFI = {};
  aLayoutFFI->offset = aLayout.mOffset;

  if (aLayout.mBytesPerRow.WasPassed()) {
    aLayoutFFI->bytes_per_row = &aLayout.mBytesPerRow.Value();
  } else {
    aLayoutFFI->bytes_per_row = nullptr;
  }

  if (aLayout.mRowsPerImage.WasPassed()) {
    aLayoutFFI->rows_per_image = &aLayout.mRowsPerImage.Value();
  } else {
    aLayoutFFI->rows_per_image = nullptr;
  }
}

void CommandEncoder::ConvertTextureCopyViewToFFI(
    const dom::GPUImageCopyTexture& aCopy,
    ffi::WGPUImageCopyTexture* aViewFFI) {
  *aViewFFI = {};
  aViewFFI->texture = aCopy.mTexture->mId;
  aViewFFI->mip_level = aCopy.mMipLevel;
  if (aCopy.mOrigin.WasPassed()) {
    const auto& origin = aCopy.mOrigin.Value();
    if (origin.IsRangeEnforcedUnsignedLongSequence()) {
      const auto& seq = origin.GetAsRangeEnforcedUnsignedLongSequence();
      aViewFFI->origin.x = seq.Length() > 0 ? seq[0] : 0;
      aViewFFI->origin.y = seq.Length() > 1 ? seq[1] : 0;
      aViewFFI->origin.z = seq.Length() > 2 ? seq[2] : 0;
    } else if (origin.IsGPUOrigin3DDict()) {
      const auto& dict = origin.GetAsGPUOrigin3DDict();
      aViewFFI->origin.x = dict.mX;
      aViewFFI->origin.y = dict.mY;
      aViewFFI->origin.z = dict.mZ;
    } else {
      MOZ_CRASH("Unexpected origin type");
    }
  }
}

static ffi::WGPUImageCopyTexture ConvertTextureCopyView(
    const dom::GPUImageCopyTexture& aCopy) {
  ffi::WGPUImageCopyTexture view = {};
  CommandEncoder::ConvertTextureCopyViewToFFI(aCopy, &view);
  return view;
}

CommandEncoder::CommandEncoder(Device* const aParent,
                               WebGPUChild* const aBridge, RawId aId)
    : ChildOf(aParent), mId(aId), mBridge(aBridge) {
  MOZ_RELEASE_ASSERT(aId);
}

CommandEncoder::~CommandEncoder() { Cleanup(); }

void CommandEncoder::Cleanup() {
  if (!mValid) {
    return;
  }
  mValid = false;

  if (!mBridge) {
    return;
  }

  if (mBridge->CanSend()) {
    mBridge->SendCommandEncoderDrop(mId);
  }

  wgpu_client_free_command_encoder_id(mBridge->GetClient(), mId);
}

void CommandEncoder::TrackPresentationContext(CanvasContext* aTargetContext) {
  if (aTargetContext) {
    if (!aTargetContext->IsOffscreenCanvas()) {
      mPresentationContexts.AppendElement(aTargetContext);
    }
  }
}

void CommandEncoder::CopyBufferToBuffer(const Buffer& aSource,
                                        BufferAddress aSourceOffset,
                                        const Buffer& aDestination,
                                        BufferAddress aDestinationOffset,
                                        BufferAddress aSize) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  ffi::wgpu_command_encoder_copy_buffer_to_buffer(
      aSource.mId, aSourceOffset, aDestination.mId, aDestinationOffset, aSize,
      ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}

void CommandEncoder::CopyBufferToTexture(
    const dom::GPUImageCopyBuffer& aSource,
    const dom::GPUImageCopyTexture& aDestination,
    const dom::GPUExtent3D& aCopySize) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  ffi::WGPUImageDataLayout src_layout = {};
  CommandEncoder::ConvertTextureDataLayoutToFFI(aSource, &src_layout);
  ffi::wgpu_command_encoder_copy_buffer_to_texture(
      aSource.mBuffer->mId, &src_layout, ConvertTextureCopyView(aDestination),
      ConvertExtent(aCopySize), ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));

  TrackPresentationContext(aDestination.mTexture->mTargetContext);
}
void CommandEncoder::CopyTextureToBuffer(
    const dom::GPUImageCopyTexture& aSource,
    const dom::GPUImageCopyBuffer& aDestination,
    const dom::GPUExtent3D& aCopySize) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  ffi::WGPUImageDataLayout dstLayout = {};
  CommandEncoder::ConvertTextureDataLayoutToFFI(aDestination, &dstLayout);
  ffi::wgpu_command_encoder_copy_texture_to_buffer(
      ConvertTextureCopyView(aSource), aDestination.mBuffer->mId, &dstLayout,
      ConvertExtent(aCopySize), ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}
void CommandEncoder::CopyTextureToTexture(
    const dom::GPUImageCopyTexture& aSource,
    const dom::GPUImageCopyTexture& aDestination,
    const dom::GPUExtent3D& aCopySize) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  ffi::wgpu_command_encoder_copy_texture_to_texture(
      ConvertTextureCopyView(aSource), ConvertTextureCopyView(aDestination),
      ConvertExtent(aCopySize), ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));

  TrackPresentationContext(aDestination.mTexture->mTargetContext);
}

void CommandEncoder::ClearBuffer(const Buffer& aBuffer, const uint64_t aOffset,
                                 const dom::Optional<uint64_t>& aSize) {
  uint64_t sizeVal = 0xdeaddead;
  uint64_t* size = nullptr;
  if (aSize.WasPassed()) {
    sizeVal = aSize.Value();
    size = &sizeVal;
  }

  ipc::ByteBuf bb;
  ffi::wgpu_command_encoder_clear_buffer(aBuffer.mId, aOffset, size,
                                         ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}

void CommandEncoder::PushDebugGroup(const nsAString& aString) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  NS_ConvertUTF16toUTF8 marker(aString);
  ffi::wgpu_command_encoder_push_debug_group(&marker, ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}
void CommandEncoder::PopDebugGroup() {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  ffi::wgpu_command_encoder_pop_debug_group(ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}
void CommandEncoder::InsertDebugMarker(const nsAString& aString) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf bb;
  NS_ConvertUTF16toUTF8 marker(aString);
  ffi::wgpu_command_encoder_insert_debug_marker(&marker, ToFFI(&bb));
  mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
}

already_AddRefed<ComputePassEncoder> CommandEncoder::BeginComputePass(
    const dom::GPUComputePassDescriptor& aDesc) {
  RefPtr<ComputePassEncoder> pass = new ComputePassEncoder(this, aDesc);
  return pass.forget();
}

already_AddRefed<RenderPassEncoder> CommandEncoder::BeginRenderPass(
    const dom::GPURenderPassDescriptor& aDesc) {
  for (const auto& at : aDesc.mColorAttachments) {
    TrackPresentationContext(at.mView->GetTargetContext());
    if (at.mResolveTarget.WasPassed()) {
      TrackPresentationContext(at.mResolveTarget.Value().GetTargetContext());
    }
  }

  RefPtr<RenderPassEncoder> pass = new RenderPassEncoder(this, aDesc);
  return pass.forget();
}

void CommandEncoder::EndComputePass(ffi::WGPURecordedComputePass& aPass) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf byteBuf;
  ffi::wgpu_compute_pass_finish(&aPass, ToFFI(&byteBuf));
  mBridge->SendComputePass(mId, mParent->mId, std::move(byteBuf));
}

void CommandEncoder::EndRenderPass(ffi::WGPURecordedRenderPass& aPass) {
  if (!mBridge->CanSend()) {
    return;
  }

  ipc::ByteBuf byteBuf;
  ffi::wgpu_render_pass_finish(&aPass, ToFFI(&byteBuf));
  mBridge->SendRenderPass(mId, mParent->mId, std::move(byteBuf));
}

already_AddRefed<CommandBuffer> CommandEncoder::Finish(
    const dom::GPUCommandBufferDescriptor& aDesc) {
  // We rely on knowledge that `CommandEncoderId` == `CommandBufferId`
  // TODO: refactor this to truly behave as if the encoder is being finished,
  // and a new command buffer ID is being created from it. Resolve the ID
  // type aliasing at the place that introduces it: `wgpu-core`.
  RawId deviceId = mParent->mId;
  if (mBridge->CanSend()) {
    mBridge->SendCommandEncoderFinish(mId, deviceId, aDesc);
  }

  RefPtr<CommandEncoder> me(this);
  RefPtr<CommandBuffer> comb = new CommandBuffer(
      mParent, mId, std::move(mPresentationContexts), std::move(me));
  return comb.forget();
}

}  // namespace mozilla::webgpu