/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.

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/framework/executor.h"
#include <vector>
#include "gtest/gtest.h"
#include "paddle/framework/attribute.h"
#include "paddle/framework/grad_op_builder.h"
#include "paddle/framework/op_registry.h"
#include "paddle/framework/operator.h"

USE_OP(elementwise_add);
USE_OP(gaussian_random);
USE_OP(feed);
USE_OP(fetch);

using std::string;
using namespace paddle::platform;
using namespace paddle::framework;

typedef paddle::framework::BlockDesc proto_block;
typedef paddle::framework::OpDesc proto_op;

void add_gaussian_random_op(string var_name, std::vector<int>& dim,
                            proto_block* block) {
  // insert variable
  auto a = block->add_vars();
  a->set_name(var_name);
  auto a_lt = a->mutable_lod_tensor();
  a_lt->set_data_type(paddle::framework::DataType::FP32);
  for (int i : dim) {
    a_lt->add_dims(i);
  }

  // insert operation
  auto op = block->add_ops();
  op->set_type("gaussian_random");
  auto dims = op->add_attrs();
  dims->set_name("dims");
  dims->set_type(paddle::framework::AttrType::INTS);
  for (int i : dim) {
    dims->add_ints(i);
  }
  auto Out = op->add_outputs();
  Out->set_parameter("Out");
  Out->add_arguments(var_name);
}

void add_feed_op(string var_name, std::vector<int>& dim, int index,
                 proto_block* block) {
  // insert variable
  auto a = block->add_vars();
  a->set_name(var_name);
  auto a_lt = a->mutable_lod_tensor();
  a_lt->set_data_type(paddle::framework::DataType::FP32);
  for (int i : dim) {
    a_lt->add_dims(i);
  }

  // insert operation
  auto op = block->add_ops();
  op->set_type("feed");

  // set dims attr
  auto dims = op->add_attrs();
  dims->set_name("dims");
  dims->set_type(paddle::framework::AttrType::INTS);
  for (int i : dim) {
    dims->add_ints(i);
  }

  // set col attr
  auto col = op->add_attrs();
  col->set_name("col");
  col->set_type(paddle::framework::AttrType::INT);
  col->set_i(index);

  auto Out = op->add_outputs();
  Out->set_parameter("Out");
  Out->add_arguments(var_name);
}

void add_fetch_op(string var_name, std::vector<int>& dim, int index,
                  proto_block* block) {
  // insert variable
  auto a = block->add_vars();
  a->set_name(var_name);
  auto a_lt = a->mutable_lod_tensor();
  a_lt->set_data_type(paddle::framework::DataType::FP32);
  for (int i : dim) {
    a_lt->add_dims(i);
  }

  // insert operation
  auto op = block->add_ops();
  op->set_type("fetch");

  // set dims attr
  auto dims = op->add_attrs();
  dims->set_name("dims");
  dims->set_type(paddle::framework::AttrType::INTS);
  for (int i : dim) {
    dims->add_ints(i);
  }

  // set col attr
  auto col = op->add_attrs();
  col->set_name("col");
  col->set_type(paddle::framework::AttrType::INT);
  col->set_i(index);

  auto Out = op->add_inputs();
  Out->set_parameter("Input");
  Out->add_arguments(var_name);
}

std::once_flag set_variable_flag;

template <typename T>
void set_feed_variable(const std::vector<std::vector<T>>& inputs) {
  typedef std::vector<paddle::framework::Tensor> FeedInputs;
  // Tensors in feed value variable will only be in CPUPlace
  Variable* g_feed_value = GetScope()->FindVar("feed_value");
  FeedInputs& feed_inputs = *(g_feed_value->GetMutable<FeedInputs>());
  auto size = inputs.size();
  feed_inputs.resize(size);
  for (size_t i = 0; i < size; i++) {
    T* dst = feed_inputs[i].mutable_data<T>(
        make_ddim({static_cast<int64_t>(inputs[i].size())}), CPUPlace());
    memcpy(dst, inputs[i].data(), inputs[i].size() * sizeof(T));
  }
}

template <typename T>
std::vector<std::vector<T>> get_fetch_variable() {
  typedef std::vector<paddle::framework::Tensor> FetchOutputs;
  // Tensors in fetch value variable will only be in CPUPlace
  Variable* g_fetch_value = GetScope()->FindVar("fetch_value");
  FetchOutputs& fetch_outputs = *(g_fetch_value->GetMutable<FetchOutputs>());

  auto size = fetch_outputs.size();
  std::vector<std::vector<T>> result;
  result.reserve(size);
  for (size_t i = 0; i < size; i++) {
    std::vector<T> tmp;
    tmp.resize(fetch_outputs[i].numel());
    memcpy(tmp.data(), fetch_outputs[i].data<T>(),
           fetch_outputs[i].numel() * sizeof(T));
    result.push_back(tmp);
  }
  return result;
}

class ExecutorTesterRandom : public ::testing::Test {
 public:
  virtual void SetUp() override {
    auto root_block = pdesc_.add_blocks();
    root_block->set_idx(0);
    root_block->set_parent_idx(-1);

    std::vector<int> dim{2, 3};
    add_gaussian_random_op("a", dim, root_block);
    add_gaussian_random_op("b", dim, root_block);

    auto c = root_block->add_vars();
    c->set_name("c");
    auto c_lt = c->mutable_lod_tensor();
    c_lt->set_data_type(paddle::framework::DataType::FP32);

    auto op = root_block->add_ops();
    op->set_type("elementwise_add");
    auto X = op->add_inputs();
    X->set_parameter("X");
    X->add_arguments("a");
    auto Y = op->add_inputs();
    Y->set_parameter("Y");
    Y->add_arguments("b");
    auto Out = op->add_outputs();
    Out->set_parameter("Out");
    Out->add_arguments("c");

    add_fetch_op("c", dim, 0, root_block);
  }

 protected:
  ProgramDesc pdesc_;
};

class ExecutorTesterFeed : public ::testing::Test {
 public:
  virtual void SetUp() override {
    auto root_block = pdesc_.add_blocks();
    root_block->set_idx(0);
    root_block->set_parent_idx(-1);

    std::vector<int> dim{6};

    add_feed_op("a", dim, 0, root_block);
    add_feed_op("b", dim, 1, root_block);

    auto c = root_block->add_vars();
    c->set_name("c");
    auto c_lt = c->mutable_lod_tensor();
    c_lt->set_data_type(paddle::framework::DataType::FP32);

    auto op = root_block->add_ops();
    op->set_type("elementwise_add");
    auto X = op->add_inputs();
    X->set_parameter("X");
    X->add_arguments("a");
    auto Y = op->add_inputs();
    Y->set_parameter("Y");
    Y->add_arguments("b");
    auto Out = op->add_outputs();
    Out->set_parameter("Out");
    Out->add_arguments("c");

    add_fetch_op("c", dim, 0, root_block);

    std::vector<float> vec1 = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0};
    std::vector<float> vec2 = {4.0, 5.0, 6.0, 7.0, 8.0, 9.0};
    inputs_.push_back(vec1);
    inputs_.push_back(vec2);
  }

 protected:
  ProgramDesc pdesc_;
  std::vector<std::vector<float>> inputs_;
};

#ifndef PADDLE_WITH_CUDA
TEST_F(ExecutorTesterRandom, CPU) {
  std::vector<Place> places;
  CPUPlace cpu_place;
  places.push_back(cpu_place);

  // We have a global Scope and BuddyAllocator, and we must ensure
  // global BuddyAllocator is initialized before global Scope. Thus,
  // global Scope will deconstruct before BuddyAllocator. Otherwise,
  // "pointer being freed was not allocated" error will appear.
  paddle::memory::Used(cpu_place);

  Executor* executor = new Executor(places);
  executor->Run(pdesc_, GetScope());
  std::vector<std::vector<float>> result = get_fetch_variable<float>();
  for (auto& vec : result) {
    for (auto& num : vec) {
      std::cout << num << " ";
    }
    std::cout << std::endl;
  }
  delete executor;
}

TEST_F(ExecutorTesterFeed, CPU) {
  std::vector<Place> places;
  CPUPlace cpu_place;
  places.push_back(cpu_place);

  // We have a global Scope and BuddyAllocator, and we must ensure
  // global BuddyAllocator is initialized before global Scope. Thus,
  // global Scope will deconstruct before BuddyAllocator. Otherwise,
  // "pointer being freed was not allocated" error will appear.
  paddle::memory::Used(cpu_place);

  Executor* executor = new Executor(places);

  // 3 mini-batch
  for (int i = 0; i < 3; i++) {
    // need to set feed variable before Executor::Run
    std::cout << "start mini-batch " << i << std::endl;
    set_feed_variable<float>(inputs_);
    executor->Run(pdesc_, GetScope());
    std::vector<std::vector<float>> result = get_fetch_variable<float>();
    for (auto& vec : result) {
      for (auto& num : vec) {
        std::cout << num << " ";
      }
      std::cout << std::endl;
    }
  }

  delete executor;
}
#else
TEST_F(ExecutorTesterRandom, GPU) {
  std::vector<Place> places;
  GPUPlace gpu_place(0);
  places.push_back(gpu_place);

  // We have a global Scope and BuddyAllocator, and we must ensure
  // global BuddyAllocator is initialized before global Scope. Thus,
  // global Scope will deconstruct before BuddyAllocator. Otherwise,
  // "pointer being freed was not allocated" error will appear.
  // If paddle is compiled with GPU, both CPU and GPU BuddyAllocator
  // need to be used at first.
  paddle::memory::Used(CPUPlace());
  paddle::memory::Used(gpu_place);

  Executor* executor = new Executor(places);
  executor->Run(pdesc_, GetScope());
  delete executor;
}

TEST_F(ExecutorTesterFeed, GPU) {
  std::vector<Place> places;
  GPUPlace gpu_place(0);
  places.push_back(gpu_place);
  // We have a global Scope and BuddyAllocator, and we must ensure
  // global BuddyAllocator is initialized before global Scope. Thus,
  // global Scope will deconstruct before BuddyAllocator. Otherwise,
  // "pointer being freed was not allocated" error will appear.
  // If paddle is compiled with GPU, both CPU and GPU BuddyAllocator
  // need to be used at first.
  paddle::memory::Used(CPUPlace());
  paddle::memory::Used(gpu_place);

  Executor* executor = new Executor(places);

  // 3 mini-batch
  for (int i = 0; i < 3; i++) {
    // need to set feed variable before Executor::Run
    std::cout << "start mini-batch " << i << std::endl;
    set_feed_variable<float>(inputs_);
    executor->Run(pdesc_, GetScope());
    std::vector<std::vector<float>> result = get_fetch_variable<float>();
    for (auto& vec : result) {
      for (auto& num : vec) {
        std::cout << num << " ";
      }
      std::cout << std::endl;
    }
  }
  delete executor;
}
#endif