// Oldham, Jeffrey D.
// 2000Feb07
// CS1321

// Declaration and Implementation of the Shopping Cart Class

#include <iostream>
#include <vector>
#include <string>
#include <utility>		// has pair<>()
#include <numeric>		// has accumulate()
#include <algorithm>		// has for_each()

// Each item has a name and a price.
typedef pair<string, double> itemNP; // instead of typing pair<...> all the time

// Print an item on a line.
void printItem(const itemNP & itm) {
  cout << itm.first << " $" << itm.second << endl;
  return;
}

// Add an item's price to the total so far.
double addPrice(const double total, itemNP itm) { return total + itm.second; }

class shoppingCart {
 public:  // Anyone can access public functions and data.
  // Constructor: invoked when creating a shopping cart.
  /* no return type permitted */ shoppingCart(const string & nm) {
    name = nm;
    return;
  }

  // Add an item to the cart.
  void insert(const string & itemName, const double price) {
    items.push_back(make_pair(itemName, price));
    return;
  }

  // Return the cost of items already in the cart.
  double totalSoFar(void) {
    return accumulate(items.begin(), items.end(), 0.0, addPrice);
  }

  // Accept the credit card number and print a receipt.
  void checkout(const string & creditCard) {
    // Notify the customer of charge to credit card.
     cout << "Charging credit card " << creditCard << " $" <<
       totalSoFar() << endl;

    // Print the receipt.
    cout << name << ", thank you for shopping at The Best.\n";
    for_each(items.begin(), items.end(), printItem);
    cout << endl;
    cout << "Total: " << totalSoFar() << endl;

    // Remove the items from the cart.
    items.clear();
    return;
  }

  // Private functions and members only accessible inside the class definition.
  // Useful as "helpers."
 private:
  string name;		// name of customer

  vector<itemNP> items;
};