// Copyright 2018 The MACE Authors. 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/core/op_context.h"
#include "mace/core/runtime/opencl/opencl_runtime.h"
#include "mace/ops/activation.h"
#include "mace/ops/opencl/helper.h"
#include "mace/utils/utils.h"

namespace mace {
namespace ops {
namespace opencl {
namespace image {

namespace {
// (inputs + weights + outputs) * array_size * sizeof(float)
const uint32_t kernel_cache_size = (5 + 4 + 5) * 4 * 4;
std::vector<uint32_t> LocalWS(OpenCLRuntime *runtime,
                              const uint32_t *gws,
                              const uint32_t kwg_size) {
  std::vector<uint32_t> lws(4, 0);
  if (kwg_size == 0) {
    lws[0] = lws[1] = lws[2] = 1;
  } else {
    uint64_t
        cache_size = runtime->device_global_mem_cache_size();
    uint32_t compute_units = std::max<uint32_t>(
        runtime->device_compute_units() / 2, 1);
    const uint32_t base =
        std::max<uint32_t>(
            std::min<uint32_t>(cache_size / kBaseGPUMemCacheSize, 4), 1);
    lws[1] = std::min<uint32_t>(gws[1], kwg_size);
    lws[0] =
        std::min<uint32_t>(std::min<uint32_t>(gws[0], base), kwg_size / lws[1]);
    const uint32_t lws_size = lws[0] * lws[1];
    lws[2] = std::min<uint32_t>(
        RoundUp<uint32_t>(
            cache_size / kernel_cache_size / lws_size / compute_units, base),
        gws[2]);
    if (lws[2] == 0) {
      lws[2] = std::min<uint32_t>(gws[2], base);
    }
    lws[2] = std::max<uint32_t>(std::min<uint32_t>(lws[2], kwg_size / lws_size),
                                1);
  }
  return lws;
}

}  // namespace

extern MaceStatus Conv2dK3x3(OpContext *context,
                             cl::Kernel *kernel,
                             const Tensor *input,
                             const Tensor *filter,
                             const Tensor *bias,
                             const int stride,
                             const int *padding,
                             const int *dilations,
                             const ActivationType activation,
                             const float relux_max_limit,
                             const float leakyrelu_coefficient,
                             const DataType dt,
                             std::vector<index_t> *prev_input_shape,
                             Tensor *output,
                             uint32_t *kwg_size) {
  const index_t batch = output->dim(0);
  const index_t height = output->dim(1);
  const index_t width = output->dim(2);
  const index_t channels = output->dim(3);
  const index_t input_channels = input->dim(3);

  const index_t channel_blocks = RoundUpDiv4(channels);
  const index_t input_channel_blocks = RoundUpDiv4(input_channels);
  const index_t width_blocks = RoundUpDiv<index_t, 5>(width);

  auto runtime = context->device()->gpu_runtime()->opencl_runtime();
  MACE_OUT_OF_RANGE_DEFINITION;

  if (kernel->get() == nullptr) {
    std::set<std::string> built_options;
    MACE_OUT_OF_RANGE_CONFIG;
    MACE_NON_UNIFORM_WG_CONFIG;
    std::string kernel_name = MACE_OBFUSCATE_SYMBOL("conv_2d_3x3");
    built_options.emplace("-Dconv_2d_3x3=" + kernel_name);
    built_options.emplace("-DDATA_TYPE=" + DtToUpCompatibleCLDt(dt));
    built_options.emplace("-DCMD_DATA_TYPE=" + DtToUpCompatibleCLCMDDt(dt));
    built_options.emplace(bias != nullptr ? "-DBIAS" : "");
    switch (activation) {
      case NOOP:
        break;
      case RELU:
        built_options.emplace("-DUSE_RELU");
        break;
      case RELUX:
        built_options.emplace("-DUSE_RELUX");
        break;
      case TANH:
        built_options.emplace("-DUSE_TANH");
        break;
      case SIGMOID:
        built_options.emplace("-DUSE_SIGMOID");
        break;
      case LEAKYRELU:
        built_options.emplace("-DUSE_LEAKYRELU");
        break;
      default:
        LOG(FATAL) << "Unknown activation type: " << activation;
    }

    MACE_RETURN_IF_ERROR(runtime->BuildKernel("conv_2d_3x3", kernel_name,
                                              built_options, kernel));

    *kwg_size =
        static_cast<uint32_t>(runtime->GetKernelMaxWorkGroupSize(*kernel));
  }

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

  // Support different input size
  if (!IsVecEqual(*prev_input_shape, input->shape())) {
    uint32_t idx = 0;
    MACE_OUT_OF_RANGE_SET_ARGS(*kernel);
    MACE_SET_3D_GWS_ARGS(*kernel, gws);
    kernel->setArg(idx++, *(input->opencl_image()));
    kernel->setArg(idx++, *(filter->opencl_image()));
    if (bias != nullptr) {
      kernel->setArg(idx++, *(bias->opencl_image()));
    }
    kernel->setArg(idx++, *(output->opencl_image()));
    kernel->setArg(idx++, relux_max_limit);
    kernel->setArg(idx++, leakyrelu_coefficient);
    kernel->setArg(idx++, static_cast<int>(input->dim(1)));
    kernel->setArg(idx++, static_cast<int>(input->dim(2)));
    kernel->setArg(idx++, static_cast<int>(input_channel_blocks));
    kernel->setArg(idx++, static_cast<int>(height));
    kernel->setArg(idx++, static_cast<int>(width));
    kernel->setArg(idx++, stride);
    kernel->setArg(idx++, padding[0] / 2);
    kernel->setArg(idx++, padding[1] / 2);
    kernel->setArg(idx++, dilations[0]);
    kernel->setArg(idx++, dilations[1]);

    *prev_input_shape = input->shape();
  }
  std::vector<uint32_t> lws = LocalWS(runtime, gws, *kwg_size);
  std::string tuning_key =
      Concat("conv2d_3x3_opencl_kernel", output->dim(0), output->dim(1),
             output->dim(2), output->dim(3));
  MACE_RETURN_IF_ERROR(TuningOrRun3DKernel(runtime, *kernel, tuning_key,
                                           gws, lws, context->future()));
  MACE_OUT_OF_RANGE_VALIDATION;
  return MaceStatus::MACE_SUCCESS;
}

}  // namespace image
}  // namespace opencl
}  // namespace ops
}  // namespace mace
