#pragma once
#include <string>
#include <memory>
#include <vector>
#include <sstream>
#include <tsl/bhopscotch_map.h>
#include "paddle/fluid/platform/place.h"
#include "paddle/fluid/train/custom_trainer/feed/common/yaml_helper.h"
#include "paddle/fluid/train/custom_trainer/feed/common/pslib_warpper.h"
#include "paddle/fluid/train/custom_trainer/feed/common/runtime_environment.h"


namespace paddle {
namespace custom_trainer {
namespace feed {

class PSlib;
class Process;
class Dataset;
class FileSystem;
class EpochAccessor;

const uint32_t SecondsPerMin = 60;
const uint32_t SecondsPerHour = 3600;
const uint32_t SecondsPerDay = 24 * 3600;

enum class ModelSaveWay {
    ModelSaveTrainCheckpoint = 0,
    ModelSaveInferenceDelta = 1,
    ModelSaveInferenceBase = 2,
    ModelSaveTrainCheckpointBase = 3,
};

enum class TrainerStatus {
    Training  = 0,  // 训练状态
    Saving    = 1  // 模型存储状态
};

const uint32_t SignCacheMaxValueNum = 13;
struct SignCacheData {
    SignCacheData() {
        memset(cache_value, 0, sizeof(float) * SignCacheMaxValueNum);
    }
    uint32_t idx;
    float cache_value[SignCacheMaxValueNum];
};
class SignCacheDict {
public:
    inline int32_t sign2index(uint64_t sign) {
        auto itr = _sign2data_map.find(sign);
        if (itr == _sign2data_map.end()) {  
            return -1;
        } 
        return itr->second.idx;
    }

    inline uint64_t index2sign(int32_t index) {
        if (index >= _sign_list.size()) {
            return 0;
        } 
        return _sign_list[index];
    }

    inline void reserve(uint32_t size) {
        _sign_list.reserve(size);
        _sign2data_map.reserve(size);
    }

    inline void clear() {
        _sign_list.clear();
        _sign2data_map.clear();
    }

    inline void append(uint64_t sign) {
        if (_sign2data_map.find(sign) != _sign2data_map.end()) {
            return;
        }
        SignCacheData data;
        data.idx = _sign_list.size();
        _sign_list.push_back(sign);
        _sign2data_map.emplace(sign, std::move(data));
    }

    inline SignCacheData* data(uint64_t sign) {
        tsl::bhopscotch_pg_map<uint64_t, SignCacheData>::iterator itr = _sign2data_map.find(sign);
        if (itr == _sign2data_map.end()) {
            return nullptr;
        }
        return const_cast<SignCacheData*>(&(itr->second));
    }
private:
    std::vector<uint64_t> _sign_list;
    tsl::bhopscotch_pg_map<uint64_t, SignCacheData> _sign2data_map;
};

class TrainerContext {
public:
    TrainerContext() {
        trainer_status.resize(2, 0);
    }
    inline paddle::ps::PSClient* ps_client() {
        return pslib->ps_client();
    }
    inline bool is_status(TrainerStatus status) {
        auto status_idx = static_cast<uint32_t>(status);
        return trainer_status[status_idx] > 0;
    }
    // 非线程安全, 其实TrainerContext所有成员的线程安全性 取决于 成员本身的线程安全性
    inline void set_status(TrainerStatus status, bool on) {
        auto status_idx = static_cast<uint32_t>(status);
        trainer_status[status_idx] = on ? 1 : 0;
    }

    std::vector<uint32_t> trainer_status;
    YAML::Node trainer_config;
    paddle::platform::CPUPlace cpu_place;

    std::shared_ptr<PSlib> pslib;
    std::stringstream monitor_ssm;                             //记录monitor信息
    std::shared_ptr<Dataset> dataset;                          //训练样本
    std::shared_ptr<FileSystem> file_system;                   //文件操作辅助类
    std::shared_ptr<EpochAccessor> epoch_accessor;             //训练轮次控制
    std::shared_ptr<RuntimeEnvironment> environment;           //运行环境
    std::vector<std::shared_ptr<Process>> process_list;        //训练流程
    std::shared_ptr<SignCacheDict> cache_dict;                 //大模型cache词典
};

class ContextStatusGurad {
public:
    ContextStatusGurad(TrainerContext* context, TrainerStatus status) :
        _context(context), _status(status) {
        _context->set_status(_status, true);
    }
    virtual ~ContextStatusGurad() {
        _context->set_status(_status, false);
    }
private:
    TrainerStatus _status;
    TrainerContext* _context = nullptr;
};

}  // namespace feed
}  // namespace custom_trainer
}  // namespace paddle