// fig09_36.cpp
// Serializing and deserializing objects with the cereal library.
#include <cereal/archives/json.hpp> 
#include <cereal/types/vector.hpp>  
#include <fmt/format.h>
#include <fstream>
#include <iostream>
#include <vector>

struct Record {
   int account{};
   std::string first{};
   std::string last{};
   double 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.account),
      cereal::make_nvp("first", record.first),
      cereal::make_nvp("last", record.last),
      cereal::make_nvp("balance", record.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.account, r.first, r.last, r.balance);
   }
}

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{"records.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{"records.json"}) {
      cereal::JSONInputArchive archive{input};
      std::vector<Record> deserializedRecords{};
      archive(deserializedRecords); // deserialize records
      std::cout << "\nDeserialized records:\n";
      displayRecords(deserializedRecords);
   }
}

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