/* 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 <map>
#include <memory>
#include <mutex>  // NOLINT
#include <set>
#include <string>
#include <thread>  // NOLINT
#include <typeinfo>
#include <vector>
#include <random> //local_random_engine
#include <time.h> //local_random_engine
#include "paddle/fluid/framework/data_feed.pb.h"
#include "paddle/fluid/framework/executor.h"
#include "paddle/fluid/framework/executor_thread_worker.h"
#include "paddle/fluid/framework/program_desc.h"
#include "paddle/fluid/framework/scope.h"

namespace paddle {
namespace framework {

inline double current_realtime() {
    struct timespec tp;
    clock_gettime(CLOCK_REALTIME, &tp);
    return tp.tv_sec + tp.tv_nsec * 1e-9;
}

inline std::default_random_engine& local_random_engine() {
    struct engine_wrapper_t {
        std::default_random_engine engine;
        engine_wrapper_t() {
            static std::atomic<unsigned long> x(0);
            std::seed_seq sseq = {x++, x++, x++, (unsigned long)(current_realtime() * 1000)};
            engine.seed(sseq);
        }
    };
    thread_local engine_wrapper_t r;
    return r.engine;
}

class AsyncExecutor {
 public:
  AsyncExecutor(Scope* scope, const platform::Place& place);
  virtual ~AsyncExecutor() {}
  void RunFromFile(const ProgramDesc& main_program,
                   const std::string& data_feed_desc_str,
                   const std::vector<std::string>& filelist,
                   const int thread_num,
                   const std::vector<std::string>& fetch_names,
                   const bool debug = false);
  //void ConfigPslib(const char* dist_desc, uint64_t* host_sign_list, int node_num, int index);
  void ConfigPslib(const std::string& dist_desc, std::vector<uint64_t>& host_sign_list, int node_num, int index);
  //void ConfigWorker() {}
  void StartServer();
  void InitModel();
  void SaveModel(const std::string& path);

 private:
  void CreateThreads(ExecutorThreadWorker* worker,
                     const ProgramDesc& main_program,
                     const std::shared_ptr<DataFeed>& reader,
                     const std::vector<std::string>& fetch_var_names,
                     Scope* root_scope, const int thread_index,
                     const bool debug);
  void PrepareDenseThread();
 public:
  std::shared_ptr<paddle::distributed::PSlib>  _pslib_ptr;
  std::shared_ptr<DensePullThread>  _pull_dense_thread;
  Scope* root_scope_;
  platform::Place place_;
  
  AsyncWorkerParamConfig _param_config;
 private:
  int actual_thread_num;
};



}  // namespace framework
}  // namespace paddle