// fig09_37.cpp
// Serializing and deserializing objects containing private data.
#include <cereal/archives/json.hpp>
#include <cereal/types/vector.hpp>
#include <fmt/format.h>
#include <fstream>
#include <iostream>
#include <string>
#include <string_view>
#include <vector>

class Record {
   // declare serialize as a friend for direct access to private data
   template<typename Archive>
   friend void serialize(Archive& archive, Record& record);

public:
   // constructor
   explicit Record(int account = 0, std::string_view first = "",
      std::string_view last = "", double balance = 0.0)
      : m_account{account}, m_first{first},
      m_last{last}, m_balance{balance} {}

   // get member functions
   int getAccount() const { return m_account; }
   const std::string& getFirst() const { return m_first; }
   const std::string& getLast() const { return m_last; }
   double getBalance() const { return m_balance; }

private:
   int m_account{};
   std::string m_first{};
   std::string m_last{};
   double m_balance{};
};

// function template serialize is responsible for serializing and 
// deserializing Record objects to/from the specified Archive
template <typename Archive>
void serialize(Archive& archive, Record& record) {
   archive(cereal::make_nvp("account", record.m_account),
      cereal::make_nvp("first", record.m_first),
      cereal::make_nvp("last", record.m_last),
      cereal::make_nvp("balance", record.m_balance));
}

// display record at command line
void displayRecords(const std::vector<Record>& records) {
   for (const auto& r : records) {
      std::cout << fmt::format("{} {} {} {:.2f}\n", r.getAccount(),
         r.getFirst(), r.getLast(), r.getBalance());
   }
}

int main() {
   std::vector records{
      Record{100, "Brian", "Blue", 123.45},
      Record{200, "Sue", "Green", 987.65}
   };

   std::cout << "Records to serialize:\n";
   displayRecords(records);

   // serialize vector of Records to JSON and store in text file
   if (std::ofstream output{"records2.json"}) {
      cereal::JSONOutputArchive archive{output};
      archive(cereal::make_nvp("records", records)); // serialize records
   }

   // deserialize JSON from text file into vector of Records
   if (std::ifstream input{"records2.json"}) {
      cereal::JSONInputArchive archive{input};
      std::vector<Record> deserializedRecords{};
      archive(deserializedRecords); // deserialize records
      std::cout << "\nDeserialized records:\n";
      displayRecords(deserializedRecords);
   }
}

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