#include <iostream>
#include <sstream>

#include "cart.h"
#include "product.h"

Shopping_Cart::Shopping_Cart()
    : reg{}
{}
    
void Shopping_Cart::add_product(Product const& product, int count)
{
    reg.push_back({count, product});
}

std::string Shopping_Cart::to_string() const
{
    std::ostringstream oss{};
    for ( Pair const& p : reg )
    {
        oss << p.count << "st " << p.product << std::endl;
    }
    oss << "Total: " << total() << std::endl;
    return oss.str();
}

double Shopping_Cart::total() const
{
    double tot{0.0};
    for ( Pair const& p : reg )
    {
        tot += p.product.get_price() * p.count;
    }    
    return tot;
}

std::ostream& operator<<(std::ostream& os, Shopping_Cart const& rhs)
{
    return os << rhs.to_string();
}