// Copyright (c) 2018 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.

#pragma once

#include <gtest/gtest.h>
#include <thread>  // NOLINT
#include <vector>
#include "paddle/fluid/framework/ir/fuse_pass_base.h"
#include "paddle/fluid/inference/analysis/analyzer.h"
#include "paddle/fluid/inference/analysis/ut_helper.h"
#include "paddle/fluid/inference/api/analysis_predictor.h"
#include "paddle/fluid/inference/api/helper.h"
#include "paddle/fluid/inference/api/paddle_inference_pass.h"
#include "paddle/fluid/platform/profiler.h"

DEFINE_string(infer_model, "", "model path");
DEFINE_string(infer_data, "", "data file");
DEFINE_int32(batch_size, 1, "batch size.");
DEFINE_int32(burning, 0, "Burning before repeat.");
DEFINE_int32(repeat, 1, "Running the inference program repeat times.");
DEFINE_bool(test_all_data, false, "Test the all dataset in data file.");
DEFINE_int32(num_threads, 1, "Running the inference program in multi-threads.");

namespace paddle {
namespace inference {

void CompareResult(const std::vector<PaddleTensor> &outputs,
                   const std::vector<PaddleTensor> &base_outputs) {
  PADDLE_ENFORCE_GT(outputs.size(), 0);
  PADDLE_ENFORCE_EQ(outputs.size(), base_outputs.size());
  for (size_t i = 0; i < outputs.size(); i++) {
    auto &out = outputs[i];
    auto &base_out = base_outputs[i];
    size_t size = std::accumulate(out.shape.begin(), out.shape.end(), 1,
                                  [](int a, int b) { return a * b; });
    size_t size1 = std::accumulate(base_out.shape.begin(), base_out.shape.end(),
                                   1, [](int a, int b) { return a * b; });
    PADDLE_ENFORCE_EQ(size, size1);
    PADDLE_ENFORCE_GT(size, 0);
    float *data = static_cast<float *>(out.data.data());
    float *base_data = static_cast<float *>(base_out.data.data());
    for (size_t i = 0; i < size; i++) {
      EXPECT_NEAR(data[i], base_data[i], 1e-3);
    }
  }
}

void TestOneThreadPrediction(
    AnalysisConfig config, const std::vector<std::vector<PaddleTensor>> inputs,
    std::vector<PaddleTensor> *outputs) {
  int batch_size = FLAGS_batch_size;
  int num_times = FLAGS_repeat;
  auto predictor =
      CreatePaddlePredictor<AnalysisConfig, PaddleEngineKind::kAnalysis>(
          config);
  Timer timer;
  timer.tic();
  for (int i = 0; i < num_times; i++) {
    for (size_t j = 0; j < inputs.size(); j++) {
      predictor->Run(inputs[j], outputs);
    }
  }
  PrintTime(batch_size, num_times, 1, 0, timer.toc() / num_times,
            inputs.size());
}

void TestMultiThreadPrediction(
    AnalysisConfig config, const std::vector<std::vector<PaddleTensor>> inputs,
    std::vector<PaddleTensor> *outputs, int num_threads) {
  int batch_size = FLAGS_batch_size;
  int num_times = FLAGS_repeat;
  std::vector<std::thread> threads;
  std::vector<std::unique_ptr<PaddlePredictor>> predictors;
  // TODO(yanchunwei): Bug here, the analyzer phase can't be parallelled
  // because AttentionLSTM's hard code nodeid will be damanged.
  for (int tid = 0; tid < num_threads; ++tid) {
    predictors.emplace_back(
        CreatePaddlePredictor<AnalysisConfig, PaddleEngineKind::kAnalysis>(
            config));
  }
  for (int tid = 0; tid < num_threads; ++tid) {
    threads.emplace_back([&, tid]() {
      // Each thread should have local inputs and outputs.
      // The inputs of each thread are all the same.
      std::vector<std::vector<PaddleTensor>> inputs_tid = inputs;
      std::vector<PaddleTensor> outputs_tid;
      Timer timer;
      timer.tic();
      for (int i = 0; i < num_times; i++) {
        for (size_t j = 0; j < inputs_tid.size(); j++) {
          predictors[tid]->Run(inputs_tid[j], &outputs_tid);
        }
      }
      PrintTime(batch_size, num_times, num_threads, tid,
                timer.toc() / num_times, inputs_tid.size());
    });
  }
  for (int i = 0; i < num_threads; ++i) {
    threads[i].join();
  }
}

void TestPrediction(AnalysisConfig config,
                    const std::vector<std::vector<PaddleTensor>> inputs,
                    std::vector<PaddleTensor> *outputs, int num_threads) {
  if (num_threads == 1) {
    TestOneThreadPrediction(config, inputs, outputs);
  } else {
    TestMultiThreadPrediction(config, inputs, outputs, num_threads);
  }
}

}  // namespace inference
}  // namespace paddle