#pragma once
/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/

/**
* @file
* @copyright 2022 MPLv2
*/
#include <chrono>
#include <cstdint>
#include <vector>
#include <cstring>
#include <BC/endianess.hpp>
#include <string>
#include <stdexcept>
#include <map>

/**
* @brief main namespace of libbattle-com++
*
* Main namespace of the libbattle-com++, everything concerning the library can be found
* in this namespace
*/
namespace BC
{

  /**
  * @brief Namespace for all BC wide DataTypes
  */
  namespace DataTypes
  {

    /**
    * @brief namespace for conversion functions for different datatypes
    */
    namespace Convert
    {

      /*
      * @brief template function to byte swap int/uint datatypes - used for endianess conversion
      *
      * @param v - pointer to a variable of some int/uint datatype - in place byte swapped
      */
      template<typename T>
      void swapBytes(T *v)
      {
       for (unsigned int i = 0;  i < sizeof(T)/2;  ++i)
        {
           std::swap(((char *)v)[i], ((char *)v)[sizeof(T)-1-i]);
         }
      }

        /**
        * @brief template for converting of simple datatypes to a byte_array, including endianness conversion to big endian
        *
        * @param variable - the variable to convert to a byte vector, needs to be int/uint datatype
        *
        * @return the std::vector<unsigned char>
        */
        template<typename T>
        std::vector<unsigned char> fromSimpleToByteArray(T &variable)
        {
          std::vector<unsigned char> bytes;
          bytes.clear();
          bytes.resize(sizeof(T));

          #ifndef IS_BIG_ENDIAN
          T convVariable = variable;
          swapBytes(&convVariable);
          std::memcpy(bytes.data(),reinterpret_cast<const unsigned char*>(&convVariable),sizeof(T));
          #else
          std::memcpy(bytes.data(),reinterpret_cast<const unsigned char*>(&variable),sizeof(T));
          #endif



          return bytes;
        }


        /**
        * @brief function to convert a std::string to an std::vector<unsigned char>
        *
        * for converting the string, first the length of the string is converted as
        * an uint32_t into the std::vector to be able to correctly parse the string
        * in a larger vector.
        *
        * @param variable - the std::string to convert
        *
        * @return the std::vector<unsigned char>
        */
        std::vector<unsigned char> fromStringToByteArray(const std::string &variable);


        /**
        * @brief function to convert a std::vector<unsigned char> to an std::string
        *
        * this is the partner function to fromStringToByteArray. It takes the
        * first 4 byte of the vector as an uint32_t string length identifier and
        * uses the following length chars as the string
        *
        * @param v - the vector to convert to a string
        * @return the string read from the vector
        * @throw std::invalid_argument: "vector too short for <X> chars"
        */
        std::string fromByteArrayToString(std::vector<unsigned char> &v);

        /**
        * @brief function to convert a std::vector<unsigned char> to an simple datatype
        *
        * this is the partner function to fromSimpleToByteArray.
        * it extracts the simple datatype like int, double, etc. from the vector and
        * returns it
        *
        * @param v - the vector to convert to a simple datatype
        * @return simple datatype
        * @throw std::invalid_argument: "the bytevector is too small to fit the datatype"
        */
        template<typename T>
        T fromByteArrayToSimple(std::vector<unsigned char> &bytes)
        {
          T convVariable;
          if(bytes.size() < sizeof(T))
          {
            throw(std::invalid_argument(std::string(__FILE__) + ":" + std::string(__PRETTY_FUNCTION__) + ":" + std::to_string(__LINE__) + ": the bytevector is too small to fit the datatype"));
          }
          std::memcpy(reinterpret_cast<unsigned char*>(&convVariable),bytes.data(),sizeof(T));
          #ifndef IS_BIG_ENDIAN
          swapBytes(&convVariable);
          #endif
          return std::move(convVariable);
        }

        /**
        * @brief function to convert a container of a simple datatype to a std::vector<unsigned char>
        *
        * this is the partner function to fromByteArrayToSimpleContainer.
        * the number of container elements is prepended to the std::vector and the simple datatype
        * elements follow.
        *
        * @param data - the container of a simple datatype
        *
        * @return the std::vector<unsigned char>;
        */
        template<class T>
        std::vector<unsigned char> fromSimpleContainerToByteArray(T &data)
        {
          std::vector<unsigned char> bytes;
          std::vector<unsigned char> convert;

          uint32_t size=data.size();
          bytes=BC::DataTypes::Convert::fromSimpleToByteArray(size);

          for(auto it = data.begin(); it!=data.end(); ++it)
          {
            convert=BC::DataTypes::Convert::fromSimpleToByteArray(*it);
            bytes.insert(std::end(bytes), std::begin(convert), std::end(convert));
          }

          return bytes;
        }

        /**
        * @brief function to convert a std::vector<unsigned char> to a container of simple datatype elements
        *
        * this is the partner function to fromSimpleContainerToByteArray. It takes the
        * first 4 byte of the vector as an uint32_t element count and parses the all the elements
        * from the vector.
        *
        * @param v - the vector to convert to a container of simple datatype elements
        *
        * @return the container
        */
        template<class T, typename S>
        T fromByteArrayToSimpleContainer(std::vector<unsigned char> &v)
        {
          T data;
          uint32_t size = BC::DataTypes::Convert::fromByteArrayToSimple<S>(v);
          v.erase(v.begin(), v.begin()+sizeof(size));
          for(uint32_t i=0; i<size; i++)
          {
            S convert = BC::DataTypes::Convert::fromByteArrayToSimple<S>(v);
            v.erase(v.begin(), v.begin()+sizeof(convert));
            data.push_back(convert);
          }

          return std::move(data);
        }

        /**
        * @brief function to convert a container of strings to a std::vector<unsigned char>
        *
        * @param data - the container of std::string
        *
        * @return the std::vector<unsigned char>
        */
        template<class T>
        std::vector<unsigned char> fromStringContainerToByteArray(T &data)
        {
          std::vector<unsigned char> bytes;
          std::vector<unsigned char> convert;

          uint32_t size=data.size();
          bytes=BC::DataTypes::Convert::fromSimpleToByteArray(size);

          for(auto it = data.begin(); it!=data.end(); ++it)
          {
            convert=BC::DataTypes::Convert::fromStringToByteArray(*it);
            bytes.insert(std::end(bytes), std::begin(convert), std::end(convert));
          }

          return bytes;
        }


        /**
        * @brief function to convert a std::vector<unsigned char> to a container of strings
        *
        * @param data - the container of std::string
        *
        * @return the std::vector<unsigned char>
        */
        template<class T>
        T fromByteArrayToStringContainer(std::vector<unsigned char> &v)
        {
          T data;
          uint32_t size = BC::DataTypes::Convert::fromByteArrayToSimple<uint32_t>(v);
          v.erase(v.begin(), v.begin()+sizeof(size));

          for(uint32_t i=0; i<size; i++)
          {
            std::string convert = BC::DataTypes::Convert::fromByteArrayToString(v);
            data.push_back(convert);
          }

          return std::move(data);
        }

    }  // namespace Convert



    /// type of the clock used by BC
    using BCClockType = std::chrono::system_clock;

    /// type of all time attributes throughout BC BCClockType::period
    using BCTimeType = uint64_t;

    /// the period of the clock within BC, can be different from the actual used clock
    using BCPeriod = std::chrono::nanoseconds;

    /// variable type for device/endpoint ids within libcms++
    using deviceIdType = uint32_t;

    /// enumeration variable for identifying major device/endpoint types.
    enum deviceMajorType : uint32_t
    {
      /// device/endpoint is a radar
      RADAR,
      /// device/endpoint is a sonar
      SONAR,
      /// device/endpoint is a lidar
      LIDAR,
      /// device/endpoint is a camera
      CAMERA,
      /// device/endpoint is a threat avaluation process/device/software
      THREAT_EVALUATION_MANAGER,
      /// device/endpoint is a FLOATS Receiver
      FLOATS_RECEIVER,
      /// device/endpoint is a display
      DISPLAY,
      /// device/endpoint is a history server
      HISTORY_SERVER,
      /// device/endpoint is a threat consolidation application
      THREAT_CONSOLIDATION,
      /// device/endpoint is an own track generator
      OWN_TRACK_GENERATOR,
      /// device/endpoint is a data fusion application
      DATA_FUSION,
      /// device/endpoint is an identification process application
      ID_PROCESS,
      /// device/endpoint type is unknown
      UNKNOWN
    };

    /**
    * @brief map converting from BC::DataTypes::deviceMajorType to string
    */
    static std::map<BC::DataTypes::deviceMajorType, std::string>deviceMojorTypeMap =
                {
                  {BC::DataTypes::deviceMajorType::UNKNOWN, "Unknown"},
                  {BC::DataTypes::deviceMajorType::DATA_FUSION, "Data Fusion"},
                  {BC::DataTypes::deviceMajorType::CAMERA, "Camera"},
                  {BC::DataTypes::deviceMajorType::DISPLAY, "Display"},
                  {BC::DataTypes::deviceMajorType::FLOATS_RECEIVER, "FLOATS Receiver"},
                  {BC::DataTypes::deviceMajorType::HISTORY_SERVER, "History Server"},
                  {BC::DataTypes::deviceMajorType::ID_PROCESS, "Identification Process"},
                  {BC::DataTypes::deviceMajorType::LIDAR, "Lidar"},
                  {BC::DataTypes::deviceMajorType::OWN_TRACK_GENERATOR, "Own Track Generator"},
                  {BC::DataTypes::deviceMajorType::RADAR, "Radar"},
                  {BC::DataTypes::deviceMajorType::SONAR, "Sonar"},
                  {BC::DataTypes::deviceMajorType::THREAT_EVALUATION_MANAGER, "Threat Evaluation"},
                  {BC::DataTypes::deviceMajorType::THREAT_CONSOLIDATION, "Threat Consolidation"}
                };

  }  // namespace DataTypes


  /**
  * @brief function to get the current time in every BC implementation
  */
  inline BC::DataTypes::BCTimeType getCurrentTime()
  {
    std::chrono::time_point<BC::DataTypes::BCClockType> now = BC::DataTypes::BCClockType::now();

    return std::chrono::duration_cast<BC::DataTypes::BCPeriod>(now.time_since_epoch()).count();
  }

  /**
  * @brief Class/Namespace for BC related constants
  */
  class Constants
  {
  public:

    /// the epoch starting date used throughout BC, used to abstract from the epoch used
    /// in different operating systems and standards
    static constexpr const char *cEpochDateTime = "1970-01-01 00:00";

    ///@name constants related to devices
    ///@{

    /// constants identifying that we want to select/address all devices in the CMS, required for publish/subscribe
    static const BC::DataTypes::deviceIdType allDevices = 0;

    ///@}


    ///@name PubSub Domain related constants
    ///@{

    /// constant identifying the real world domain
    static constexpr const char *cRealWorldDomain = "REALWORLD";

    /// constant identifying the default simulation domain
    static constexpr const char *cSimWorldDomain = "SIMULATION";

    /// constant identifying the Management domain
    static constexpr const char *cManagementDomain = "_MANAGEMENT_";

    /// constant identifying all domains
    static constexpr const char *cAllDomains = "_DOMAIN_ALL_";

    ///@}

    ///@name PubSub Topic related constants
    ///@{

    /// constant identifying that the subscriber is interested in all topics
    static constexpr const char *cAllTopics = "_TOPIC_ALL_";

    /// constant identifying the PING topic, for pinging subscribers
    static constexpr const char *cPingTopic = "_TOPIC_PING_";

    /// constant identifying the PONG topic, for answering a PING
    static constexpr const char *cPongTopic = "_TOPIC_PONG_";

    /// constant identifying the HOTPLUG JOIN message topic
    static constexpr const char *cHotplugJoin = "_HOTPLUG_JOIN_";

    /// constant identifying the HOTPLUG LEAVE message topic
    static constexpr const char *cHotplugLeave = "_HOTPLUG_LEAVE_";

    /// constant identifying the PING message topic
    static constexpr const char *cPing = "_PING_";

    /// constant identifying the PONG message topic
    static constexpr const char *cPong = "_PONG_";
  };

}  // namespace BC