// Copyright (c) 2021 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 "paddle/fluid/operators/dlnne/dlnne_engine_op.h"
#include <gtest/gtest.h>
#include "paddle/fluid/framework/block_desc.h"
#include "paddle/fluid/framework/lod_tensor.h"
#include "paddle/fluid/framework/op_desc.h"
#include "paddle/fluid/framework/op_registry.h"
#include "paddle/fluid/framework/program_desc.h"
#include "paddle/fluid/framework/scope.h"
#include "paddle/fluid/inference/analysis/helper.h"
#include "paddle/fluid/inference/tensorrt/convert/op_converter.h"
#include "paddle/fluid/inference/tensorrt/convert/ut_helper.h"
#include "paddle/fluid/operators/tensorrt/tensorrt_engine_op.h"

USE_NO_KERNEL_OP(dlnne_engine);
namespace paddle {
namespace operators {

namespace {
void CreateCUDATensor(framework::Scope* scope, const std::string& name,
                      const std::vector<int64_t>& shape) {
  auto* var = scope->Var(name);
  auto* tensor = var->GetMutable<framework::LoDTensor>();
  auto dims = framework::make_ddim(shape);
  tensor->Resize(dims);
  platform::CUDAPlace place;
  platform::CUDADeviceContext ctx(place);
  inference::tensorrt::RandomizeTensor(tensor, place, ctx);
}

void AddTensorToBlockDesc(framework::proto::BlockDesc* block,
                          const std::string& name,
                          const std::vector<int64_t>& shape) {
  using framework::proto::VarType;
  auto* var = block->add_vars();
  framework::VarDesc desc(name);
  desc.SetType(VarType::LOD_TENSOR);
  desc.SetDataType(VarType::FP32);
  desc.SetShape(shape);
  *var = *desc.Proto();
}

}  // namespace

using inference::analysis::SetAttr;

TEST(DlnneEngineOp, manual) {
  framework::ProgramDesc program;
  auto* block_ = program.Proto()->add_blocks();
  block_->set_idx(0);
  block_->set_parent_idx(-1);

  LOG(INFO) << "create block desc";
  framework::BlockDesc block_desc(&program, block_);
  LOG(INFO) << "create fc op";
  auto* fc0 = block_desc.AppendOp();
  fc0->SetType("fc");
  fc0->SetInput("X", std::vector<std::string>({"x"}));     // 4 x 1 x 1
  fc0->SetInput("Y", std::vector<std::string>({"y"}));     // 4 x 6
  fc0->SetOutput("Out", std::vector<std::string>({"z"}));  // 6 x 1 x 1

  LOG(INFO) << "create fc op";
  auto* fc1 = block_desc.AppendOp();
  fc1->SetType("fc");
  fc1->SetInput("X", std::vector<std::string>({"z"}));
  fc1->SetInput("Y", std::vector<std::string>({"y0"}));     // 6 x 8
  fc1->SetOutput("Out", std::vector<std::string>({"z0"}));  // 8 x 1 x 1

  // Set inputs' variable shape in BlockDesc
  // the batch size is 2, so the dims of 'x' is {2, 4, 1, 1}
  AddTensorToBlockDesc(block_, "x", std::vector<int64_t>({2, 4, 1, 1}));
  AddTensorToBlockDesc(block_, "y", std::vector<int64_t>({4, 6}));
  AddTensorToBlockDesc(block_, "y0", std::vector<int64_t>({6, 8}));
  AddTensorToBlockDesc(block_, "z", std::vector<int64_t>({2, 6}));

  // It is wired, need to copy manually.
  *block_->add_ops() = *fc0->Proto();
  *block_->add_ops() = *fc1->Proto();

  ASSERT_EQ(block_->ops_size(), 2);

  LOG(INFO) << "create dlnne desc";
  framework::OpDesc engine_op_desc(nullptr);
  engine_op_desc.SetType("dlnne_engine");
  engine_op_desc.SetInput("Xs", std::vector<std::string>({"x"}));
  engine_op_desc.SetOutput("Ys", std::vector<std::string>({"z0"}));

  engine_op_desc.SetBlockAttr("sub_block", &block_desc);
  engine_op_desc.SetAttr("max_batch_size", static_cast<int>(2));
  engine_op_desc.SetAttr("workspace_size", static_cast<int>(1 << 20));
  engine_op_desc.SetAttr("parameters", std::vector<std::string>({}));
  engine_op_desc.SetAttr("engine_key", std::string("a_engine"));
  engine_op_desc.SetAttr("calibration_engine_key",
                         std::string("a_calib_engine"));
  engine_op_desc.SetAttr("predictor_id", 1);
  engine_op_desc.SetAttr("calibration_data", std::string(""));
  engine_op_desc.SetAttr("enable_int8", static_cast<bool>(false));
  engine_op_desc.SetAttr("enable_fp16", static_cast<bool>(false));
  engine_op_desc.SetAttr("use_calib_mode", static_cast<bool>(false));
  engine_op_desc.SetAttr("output_name_mapping",
                         std::vector<std::string>({"z0"}));
  engine_op_desc.SetAttr("origin_output_dims", std::vector<int>({2}));
  engine_op_desc.SetAttr("subgraph", std::string(block_->SerializeAsString()));
  engine_op_desc.SetAttr("engine_serialized_data", std::string(""));
  int device_id = 0;
  engine_op_desc.SetAttr("gpu_id", device_id);

  LOG(INFO) << "create engine op";
  auto engine_op = framework::OpRegistry::CreateOp(engine_op_desc);
  LOG(INFO) << "engine_op " << engine_op.get();

  framework::Scope scope;
  platform::CUDAPlace place;
  platform::CUDADeviceContext ctx(place);
  // Prepare variables.
  CreateCUDATensor(&scope, "x", std::vector<int64_t>({2, 4}));
  CreateCUDATensor(&scope, "y", std::vector<int64_t>({4, 6}));
  CreateCUDATensor(&scope, "z", std::vector<int64_t>({2, 6}));

  CreateCUDATensor(&scope, "y0", std::vector<int64_t>({6, 8}));
  CreateCUDATensor(&scope, "z0", std::vector<int64_t>({2, 8}));

  // Execute them.
  LOG(INFO) << "engine_op run";
  engine_op->Run(scope, place);
}

void Execute(int batch_size, int input_dim, int output_dim, int nlayers = 1) {
  framework::ProgramDesc program;
  framework::Scope scope;
  platform::CUDAPlace place;
  platform::CUDADeviceContext ctx(place);

  auto* block_ = program.Proto()->add_blocks();
  block_->set_idx(0);
  block_->set_parent_idx(-1);

  using shape_t = std::vector<int64_t>;

  LOG(INFO) << "create block desc";
  framework::BlockDesc block_desc(&program, block_);

  auto AddFCLayer = [&](const std::string& x_name, const std::string& y_name,
                        const std::string& z_name, bool x_created,
                        const shape_t& x_shape, const shape_t& y_shape,
                        const shape_t& z_shape) {
    LOG(INFO) << "create fc op";
    auto* fc = block_desc.AppendOp();
    fc->SetType("mul");
    fc->SetInput("X", std::vector<std::string>({x_name}));
    fc->SetInput("Y", std::vector<std::string>({y_name}));
    fc->SetOutput("Out", std::vector<std::string>({z_name}));

    // Set inputs' variable shape in BlockDesc
    if (!x_created) {
      AddTensorToBlockDesc(block_, x_name,
                           std::vector<int64_t>({batch_size, input_dim, 1, 1}));
    }
    AddTensorToBlockDesc(block_, y_name,
                         std::vector<int64_t>({input_dim, output_dim}));
    AddTensorToBlockDesc(block_, z_name,
                         std::vector<int64_t>({batch_size, output_dim}));

    // Prepare variables.
    if (!x_created) {
      CreateCUDATensor(&scope, x_name, std::vector<int64_t>(x_shape));
    }
    CreateCUDATensor(&scope, y_name, std::vector<int64_t>(y_shape));
    CreateCUDATensor(&scope, z_name, std::vector<int64_t>(z_shape));

    // It is wired, need to copy manually.
    *block_->add_ops() = *fc->Proto();
  };

  // Test with 4 layer FC
  AddFCLayer("x0", "y0", "z0", false, {batch_size, input_dim},
             {input_dim, output_dim}, {batch_size, output_dim});
  AddFCLayer("z0", "y1", "z1", true, {}, {output_dim, output_dim},
             {batch_size, output_dim});
  AddFCLayer("z1", "y2", "z2", true, {}, {output_dim, output_dim},
             {batch_size, output_dim});
  AddFCLayer("z2", "y3", "z3", true, {}, {output_dim, output_dim},
             {batch_size, output_dim});

  LOG(INFO) << "create dlnne desc";
  framework::OpDesc engine_op_desc(nullptr);
  engine_op_desc.SetType("dlnne_engine");
  engine_op_desc.SetInput("Xs", std::vector<std::string>({"x0"}));
  engine_op_desc.SetOutput("Ys", std::vector<std::string>({"z3"}));

  engine_op_desc.SetBlockAttr("sub_block", &block_desc);
  engine_op_desc.SetAttr("max_batch_size", static_cast<int>(batch_size));
  engine_op_desc.SetAttr("workspace_size", static_cast<int>(1 << 20));
  engine_op_desc.SetAttr("parameters",
                         std::vector<std::string>({"y0", "y1", "y2", "y3"}));
  engine_op_desc.SetAttr("engine_key", std::string("b_engine"));
  engine_op_desc.SetAttr("calibration_engine_key",
                         std::string("b_calib_engine"));
  engine_op_desc.SetAttr("predictor_id", 1);
  engine_op_desc.SetAttr("calibration_data", std::string(""));
  engine_op_desc.SetAttr("enable_int8", static_cast<bool>(false));
  engine_op_desc.SetAttr("enable_fp16", static_cast<bool>(false));
  engine_op_desc.SetAttr("use_calib_mode", static_cast<bool>(false));
  engine_op_desc.SetAttr("output_name_mapping",
                         std::vector<std::string>({"z3"}));
  engine_op_desc.SetAttr("origin_output_dims", std::vector<int>({2}));
  engine_op_desc.SetAttr("subgraph", std::string(block_->SerializeAsString()));
  engine_op_desc.SetAttr("engine_serialized_data", std::string(""));
  int device_id = 0;
  engine_op_desc.SetAttr("gpu_id", device_id);

  auto engine_op = framework::OpRegistry::CreateOp(engine_op_desc);

  // Execute them.
  engine_op->Run(scope, place);
}

// Test with a larger FC layer.
TEST(DlnneEngineOp, fc) { Execute(40, 28, 28); }

}  // namespace operators
}  // namespace paddle

USE_TRT_CONVERTER(fc)
