/*
 * preference.h
 *
 *  Created on: 2021年4月16日
 *      Author: pengzc
 */

#ifndef _FY_PREFERENCE_HPP_
#define _FY_PREFERENCE_HPP_

#include <unistd.h>

#include <string>
#include <sstream>
#include <iostream>
#include <fstream>

#include <json/Json.h>
#include <system/Thread.h>
#include <utils/Log.h>

#define FY_APPLICATION_PREFERENCES_PATH "/data/prefs.json"

namespace base {

class prefs {
public:
  virtual ~prefs() {
  }

  static void put(const std::string& name, const std::string &value) {
    instance().write_json(name, value);
  }

  static void put(const std::string& name, const char* value) {
    instance().write_json(name, value);
  }

  static void put(const std::string& name, const int value) {
    instance().write_json(name, value);
  }
  static void put(const std::string& name, const bool value) {
    instance().write_json(name, value);
  }

  static std::string get_string(const std::string &name, const std::string &def) {
    Mutex::Autolock lock(instance().mutex_);
    if (!instance().json_.isMember(name)) {
      return def;
    }
    if (!instance().json_[name].isString()) {
      return def;
    }
    return instance().json_[name].asString();
  }
  static int get_int(const std::string &name, const int def) {
    Mutex::Autolock lock(instance().mutex_);
    if (!instance().json_.isMember(name)) {
      return def;
    }
    if (!instance().json_[name].isInt()) {
      return def;
    }
    return instance().json_[name].asInt();
  }
  static bool get_bool(const std::string &name, const bool def) {
    Mutex::Autolock lock(instance().mutex_);
    if (!instance().json_.isMember(name)) {
      return def;
    }
    if (!instance().json_[name].isBool()) {
      return def;
    }
    return instance().json_[name].asBool();
  }

  static void remove(const std::string &name) {
    instance().remove_key(name);
  }

  static void clear() {
    instance().remove_all();
  }

private:
  prefs() {
    LOGD("prefs 1");
    std::ifstream ifs(FY_APPLICATION_PREFERENCES_PATH, std::ios::in | std::ios::binary);
    if (!ifs.is_open()) {
      //兼容
      ifs.open("/data/preferences.json", std::ios::in | std::ios::binary);
    }
    std::stringstream  ss;
    ss << ifs.rdbuf();
    std::string file_content(ss.str());
    if (file_content.empty()) {
      return;
    }
    ifs.close();
    LOGD("prefs 2");

    Json::Reader reader;
    if (!reader.parse(file_content.c_str(), file_content.c_str() + file_content.length(), json_, false)) {
      LOGE("%s parse failed", __PRETTY_FUNCTION__);
    }
    LOGD("prefs 3");
  }
  static prefs& instance() {
    static prefs singleton;
    return singleton;
  }

private:
  template<class T>
  void write_json(const std::string &name, T value) {
    Mutex::Autolock lock(mutex_);
    if (json_.isMember(name) && (json_[name].compare(value) == 0)) {
      return;
    }
    json_[name] = value;
    write_json(json_);
  }

  void write_json(const Json::Value &json) {
    std::ofstream ofs(FY_APPLICATION_PREFERENCES_PATH, std::ios::out | std::ios::binary);
    if (!ofs.is_open()) {
      return;
    }
    std::string str = json_.toStyledString();
    ofs.write(str.c_str(), str.length());
    ofs.flush();
    ofs.close();
    sync();
  }
  void remove_key(const std::string &name) {
    Mutex::Autolock lock(mutex_);
    json_.removeMember(name);
    write_json(json_);
  }

  void remove_all() {
    Mutex::Autolock lock(mutex_);
    json_.clear();
    write_json(json_);
  }

private:
  Json::Value json_;
  Mutex mutex_;
};

} /* namespace fy */

#endif /* _FY_PREFERENCE_HPP_ */