// Copyright 2018 Xiaomi, Inc.  All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "mace/kernels/bias_add.h"
#include "mace/core/runtime/opencl/cl2_header.h"
#include "mace/core/runtime/opencl/opencl_runtime.h"
#include "mace/kernels/opencl/helper.h"
#include "mace/utils/utils.h"

namespace mace {
namespace kernels {

template <typename T>
MaceStatus BiasAddFunctor<DeviceType::GPU, T>::operator()(const Tensor *input,
                                                          const Tensor *bias,
                                                          Tensor *output,
                                                          StatsFuture *future) {
  const index_t batch = input->dim(0);
  const index_t height = input->dim(1);
  const index_t width = input->dim(2);
  const index_t channels = input->dim(3);

  const index_t channel_blocks = RoundUpDiv4(channels);

  const uint32_t gws[3] = {static_cast<uint32_t>(channel_blocks),
                           static_cast<uint32_t>(width),
                           static_cast<uint32_t>(height * batch)};

  auto runtime = OpenCLRuntime::Global();

  if (kernel_.get() == nullptr) {
    std::set<std::string> built_options;
    auto dt = DataTypeToEnum<T>::value;
    std::string kernel_name = MACE_OBFUSCATE_SYMBOL("bias_add");
    built_options.emplace("-Dbias_add=" + kernel_name);
    built_options.emplace("-DDATA_TYPE=" + DtToUpstreamCLDt(dt));
    built_options.emplace("-DCMD_DATA_TYPE=" + DtToUpstreamCLCMDDt(dt));
    if (runtime->IsOutOfRangeCheckEnabled()) {
      built_options.emplace("-DOUT_OF_RANGE_CHECK");
      kernel_error_ = std::move(std::unique_ptr<Buffer>(
          new Buffer(GetDeviceAllocator(DeviceType::GPU))));
      MACE_RETURN_IF_ERROR(kernel_error_->Allocate(1));
      kernel_error_->Map(nullptr);
      *(kernel_error_->mutable_data<char>()) = 0;
      kernel_error_->UnMap();
    }
    if (runtime->IsNonUniformWorkgroupsSupported()) {
      built_options.emplace("-DNON_UNIFORM_WORK_GROUP");
    }
    kernel_ = runtime->BuildKernel("bias_add", kernel_name, built_options);

    kwg_size_ =
        static_cast<uint32_t>(runtime->GetKernelMaxWorkGroupSize(kernel_));
  }
  if (!IsVecEqual(input_shape_, input->shape())) {
    uint32_t idx = 0;
    if (runtime->IsOutOfRangeCheckEnabled()) {
      kernel_.setArg(idx++,
                     *(static_cast<cl::Buffer *>(kernel_error_->buffer())));
    }
    if (!runtime->IsNonUniformWorkgroupsSupported()) {
      kernel_.setArg(idx++, gws[0]);
      kernel_.setArg(idx++, gws[1]);
      kernel_.setArg(idx++, gws[2]);
    }
    kernel_.setArg(idx++, *(input->opencl_image()));
    kernel_.setArg(idx++, *(bias->opencl_image()));
    kernel_.setArg(idx++, *(output->opencl_image()));
    input_shape_ = input->shape();
  }

  const std::vector<uint32_t> lws = Default3DLocalWS(gws, kwg_size_);

  cl::Event event;
  cl_int error;
  if (runtime->IsNonUniformWorkgroupsSupported()) {
    error = runtime->command_queue().enqueueNDRangeKernel(
        kernel_, cl::NullRange, cl::NDRange(gws[0], gws[1], gws[2]),
        cl::NDRange(lws[0], lws[1], lws[2]), nullptr, &event);
  } else {
    std::vector<uint32_t> roundup_gws(lws.size());
    for (size_t i = 0; i < lws.size(); ++i) {
      if (lws[i] != 0) roundup_gws[i] = RoundUp(gws[i], lws[i]);
    }

    error = runtime->command_queue().enqueueNDRangeKernel(
        kernel_, cl::NullRange,
        cl::NDRange(roundup_gws[0], roundup_gws[1], roundup_gws[2]),
        cl::NDRange(lws[0], lws[1], lws[2]), nullptr, &event);
  }
  MACE_CHECK_CL_SUCCESS(error);
  if (runtime->IsOutOfRangeCheckEnabled()) {
    kernel_error_->Map(nullptr);
    char *kerror_code = kernel_error_->mutable_data<char>();
    MACE_CHECK(*kerror_code == 0) << "Kernel error code: " << *kerror_code;
    kernel_error_->UnMap();
  }
  if (future != nullptr) {
    future->wait_fn = [runtime, event](CallStats *stats) {
      event.wait();
      if (stats != nullptr) {
        runtime->GetCallStats(event, stats);
      }
    };
  }

  return MACE_SUCCESS;
}

template struct BiasAddFunctor<DeviceType::GPU, float>;
template struct BiasAddFunctor<DeviceType::GPU, half>;
}  // namespace kernels
}  // namespace mace
