#include "json2/json2.hpp"

#include <vector>
#include <string>
#include <fstream>
#include <iostream>

struct coordinates
{
    double x;
    double y;
    double z;
};

struct target
{
    std::vector<coordinates> coord;
};

int main()
{
    try
    {
        const auto coord_parser = json::make_object<coordinates>(
            json::pair("x", &coordinates::x),
            json::pair("y", &coordinates::y),
            json::pair("z", &coordinates::z)
        );

        auto parser = json::make_object<target>(
            json::pair("coordinates", json::array(&target::coord, coord_parser))
        );

        target result;
        std::ifstream file("./1.json");
        parser.read(file, result);

        double x = 0.0;
        double y = 0.0;
        double z = 0.0;
        std::size_t size = result.coord.size();

        for (std::size_t i = 0; i < size; ++i)
        {
            const auto& coord = result.coord[i];
            x += coord.x;
            y += coord.y;
            z += coord.z;
        }

        std::cout << x / static_cast<double>(size) << std::endl
            << y / static_cast<double>(size) << std::endl
            << z / static_cast<double>(size) << std::endl;
    }
    catch (const std::exception& e)
    {
        std::cerr << e.what() << std::endl;
    }

    return 0;
}