// 08-receipt.cpp : output a till-receipt from user input

import std;
using namespace std;

struct Entry {
    string product;
    size_t quantity;
    double unit_price;
    inline static double total{};
};

Entry add_entry(const string& input) {
    Entry e;
    istringstream iss{ input };
    iss >> e.product >> e.quantity >> e.unit_price;
    if (iss.fail()) {
        cerr << "Bad entry.\n";
        e.quantity = 0;
    }
    else {
        Entry::total += e.quantity * e.unit_price;
    }
    return e;
}

int main() {
    vector<Entry> sales;
    cout << "Please enter: PRODUCT QTY PRICE (eg. \'Apple 6 0.50\')\n";
    string s;
    getline(cin, s);
    while(!s.empty()) {
        sales.emplace_back(add_entry(s));
        cout << "Please enter: PRODUCT QTY PRICE (blank line to finish)\n";
        getline(cin, s);
    }

    cout << "====================\n";
    auto f = cout.flags();
    auto p = cout.precision(2);
    cout.setf(ios_base::fixed, ios_base::floatfield);
    for (const auto& line : sales) {
        if (line.quantity) {
            cout.setf(ios_base::left, ios_base::adjustfield);
            cout.width(11);
            cout << line.product;
            cout.unsetf(ios_base::adjustfield);
            cout.width(3);
            cout << line.quantity;
            cout.width(6);
            cout << line.unit_price << '\n';
        }
    }
    cout << "====================\n";
    cout << "Total:";
    cout.width(14);
    cout << Entry::total << '\n';
    cout.flags(f);
    cout.precision(p);
}