#include <algorithm>
#include <fstream>
#include <iostream>
#include <iterator>
#include <numeric>
#include <string>

struct Product
{
    std::string name { };
    double price { };
    int stock { };
};

namespace std
{
    std::istream& operator>>(std::istream& is, Product& product)
    {
        return is >> product.name >> product.price >> product.stock;
    }

    std::ostream& operator<<(std::ostream& os, Product const& product)
    {
        return os << product.name << " (" << product.price << " SEK)";
    }
}

int main()
{
    std::ifstream ifs { "products.txt" };
    std::vector<Product> products { std::istream_iterator<Product>{ ifs },
                                    std::istream_iterator<Product>{ } };

    std::sort(std::begin(products), std::end(products),
              [](auto&& p1, auto&& p2) { return p1.price > p2.price; });

    auto it = std::stable_partition(std::begin(products), std::end(products),
                                    [](Product const& p) { return p.stock > 0; });

    std::cout << "Total value of stock: "
              << std::accumulate(std::begin(products), it, 0.0,
                                 [](double total, Product const& p)
                                 { return total + (p.price * p.stock); }) << std::endl;

    std::ostream_iterator<Product> oit { std::cout, "\n" };

    std::cout << "Products in-stock: " << std::endl;
    std::copy(std::begin(products), it, oit);

    std::cout << "Products out-of-stock: " << std::endl;
    std::copy(it, std::end(products), oit);
}