// Copyright (c) 2019 PaddlePaddle 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 "lite/backends/opencl/cl_half.h"
#include "lite/backends/opencl/cl_include.h"
#include "lite/core/kernel.h"
#include "lite/core/op_registry.h"
#include "lite/kernels/opencl/image_helper.h"
#include "lite/operators/op_params.h"
#include "lite/utils/replace_stl/stream.h"

namespace paddle {
namespace lite {
namespace kernels {
namespace opencl {

class ActivationComputeImageDefault
    : public KernelLite<TARGET(kOpenCL),
                        PRECISION(kFP16),
                        DATALAYOUT(kImageDefault)> {
 public:
  using param_t = operators::ActivationParam;

  std::string doc() const override {
    return "Activation using cl::Image2D(ImageDefault/RGBA), kFP16";
  }

  void PrepareForRun() override {
    act_param_ = param_.get_mutable<param_t>();
    int act_type = static_cast<int>(act_param_->active_type);
#ifndef LITE_SHUTDOWN_LOG
    VLOG(1) << "ActivationTypeToStr(act_param_->active_type):"
            << ActivationTypeToStr(act_param_->active_type);
#endif
    switch (act_type) {
      case 1:
        kernel_func_name_ = "relu";
        break;
      case 2:
        kernel_func_name_ = "relu6";
        threshold_ = act_param_->Relu_clipped_coef;
        break;
      case 4:
        kernel_func_name_ = "leaky_relu";
        scale_ = act_param_->Leaky_relu_alpha;
        break;
      case 5:
        kernel_func_name_ = "sigmoid";
        break;
      case 6:
        kernel_func_name_ = "tanh_act";
        break;
      case 7:
        kernel_func_name_ = "swish";
        scale_ = act_param_->Swish_beta;
        break;
      case 8:
        kernel_func_name_ = "exp_act";
        break;
      default:
        LOG(FATAL) << "This act type:" << act_type << " doesn't support.";
        return;
    }
#ifndef LITE_SHUTDOWN_LOG
    VLOG(1) << "kernel_func_name_:" << kernel_func_name_;
#endif

    auto& context = ctx_->As<OpenCLContext>();
    context.cl_context()->AddKernel(kernel_func_name_,
                                    "image/activation_kernel.cl",
                                    build_options_,
                                    time_stamp_);

    STL::stringstream kernel_key;
    kernel_key << kernel_func_name_ << build_options_ << time_stamp_;
    kernel_ = context.cl_context()->GetKernel(kernel_key.str());
  }

  void ReInitWhenNeeded() override {
    act_param_ = param_.get_mutable<param_t>();
    auto x_dims = act_param_->X->dims();
    if ((!first_epoch_for_reinit_ && x_dims != last_x_dims_) ||
        first_epoch_for_reinit_) {
      last_x_dims_ = x_dims;
      first_epoch_for_reinit_ = false;

      // compute image shape
      paddle::lite::CLImageConverterDefault default_convertor;
      x_img_shape_ = default_convertor.InitImageDimInfoWith(
          act_param_->X->dims());  // w, h
      out_img_shape_ = default_convertor.InitImageDimInfoWith(
          act_param_->Out->dims());  // w, h

      // compute global work size
      GetGlobalWorkSize();
    }
  }

  void GetGlobalWorkSize() {
    global_work_size_ =
        cl::NDRange{static_cast<cl::size_type>(x_img_shape_[0]),
                    static_cast<cl::size_type>(x_img_shape_[1])};
  }

  void Run() override {
    auto* x_img = act_param_->X->data<half_t, cl::Image2D>();
    auto* out_img = act_param_->Out->mutable_data<half_t, cl::Image2D>(
        out_img_shape_[0], out_img_shape_[1]);

    auto kernel = kernel_;
    cl_int status;
    status = kernel.setArg(0, *x_img);
    CL_CHECK_FATAL(status);
    status = kernel.setArg(1, *out_img);
    CL_CHECK_FATAL(status);
    status = kernel.setArg(2, threshold_);
    CL_CHECK_FATAL(status);
    status = kernel.setArg(3, scale_);
    CL_CHECK_FATAL(status);

#ifndef LITE_SHUTDOWN_LOG
    const auto& x_dims = act_param_->X->dims();
    const auto& y_dims = act_param_->Out->dims();  // useless: check dim only
    VLOG(4) << TargetToStr(act_param_->X->target());
    VLOG(4) << TargetToStr(act_param_->Out->target());
    VLOG(4) << "x_img_shape_(w,h):" << x_img_shape_[0] << " "
            << x_img_shape_[1];
    VLOG(4) << "x_dims[" << x_dims.size() << "D]:" << x_dims[0] << " "
            << x_dims[1] << " " << x_dims[2] << " " << x_dims[3];
    VLOG(4) << "y_dims[" << y_dims.size() << "D]:" << y_dims[0] << " "
            << y_dims[1] << " " << y_dims[2] << " " << y_dims[3];
    VLOG(4) << "threshold:" << threshold_;
    VLOG(4) << "scale:" << scale_;
    VLOG(4) << "kernel func name:" << kernel_func_name_;
#endif

    auto& context = ctx_->As<OpenCLContext>();
    CHECK(context.cl_context() != nullptr);

    status = context.cl_context()->GetCommandQueue().enqueueNDRangeKernel(
        kernel,
        cl::NullRange,
        global_work_size_,
        cl::NullRange,
        nullptr,
        nullptr);
    CL_CHECK_FATAL(status);
  }

 private:
  param_t* act_param_{nullptr};
  DDim x_img_shape_ = DDim(std::vector<DDim::value_type>(
      {static_cast<DDim::value_type>(1), static_cast<DDim::value_type>(1)}));
  DDim out_img_shape_ = DDim(std::vector<DDim::value_type>(
      {static_cast<DDim::value_type>(1), static_cast<DDim::value_type>(1)}));
  DDim last_x_dims_;
  std::string kernel_func_name_{};
  float threshold_{6.f};
  float scale_{1.f};
  cl::Kernel kernel_;
  bool first_epoch_for_reinit_{true};
  cl::NDRange global_work_size_ = cl::NDRange{
      static_cast<size_t>(1), static_cast<size_t>(1), static_cast<size_t>(1)};
  std::string build_options_{"-DCL_DTYPE_half"};
  std::string time_stamp_{GetTimeStamp()};
};
}  // namespace opencl
}  // namespace kernels
}  // namespace lite
}  // namespace paddle
// leakyRelu
REGISTER_LITE_KERNEL(
    leaky_relu,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// swish
REGISTER_LITE_KERNEL(
    swish,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// exp
REGISTER_LITE_KERNEL(
    exp,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// tanh
REGISTER_LITE_KERNEL(
    tanh,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// Relu
REGISTER_LITE_KERNEL(
    relu,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// Relu6
REGISTER_LITE_KERNEL(
    relu6,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();

// Sigmoid
REGISTER_LITE_KERNEL(
    sigmoid,
    kOpenCL,
    kFP16,
    kImageDefault,
    paddle::lite::kernels::opencl::ActivationComputeImageDefault,
    ImageDefault)
    .BindInput("X",
               {LiteType::GetTensorTy(TARGET(kOpenCL),
                                      PRECISION(kFP16),
                                      DATALAYOUT(kImageDefault))})
    .BindOutput("Out",
                {LiteType::GetTensorTy(TARGET(kOpenCL),
                                       PRECISION(kFP16),
                                       DATALAYOUT(kImageDefault))})
    .Finalize();