// Lec10.cpp
#include <iostream>
#include <iomanip>
using namespace std;


enum statements { InsertMoney, WaitForSelection, CheckInventory, ReturnTotal };
double sodacost = 0.75;
statements state = InsertMoney;

int main()
{
	int coke = 2;
	int pepsi = 2;

	while (true) {
		switch (state) {


		case InsertMoney:
			cout << "Please Insert Money or press 0 for a refund" << endl;
			double money;
			cin >> money;

			if (money == 0) {
					state = ReturnTotal;
				}

			else if (money >= sodacost) {
				double change = money - sodacost;
				cout << "Your change is " << change << endl;
				state = WaitForSelection;
			}

			else if (money < sodacost) {
				cout << "Not enough money" << endl;
				state = InsertMoney;
			}

			break;


		case WaitForSelection:
			cout << "Please press 1 for Coke, 2 for Pepsi, or 9 for refund: " << endl;
			int decision;
			cin >> decision;

			if (decision == 1) {
				state = CheckInventory;
			}

			else if (decision == 2) {
				state = CheckInventory;
			}

			else if (decision == 9) {
				state = ReturnTotal;
			}
			break;


		case CheckInventory:
			cout << "The inventory is currently being checked. Please wait a moment" << endl;

			if (decision == 1) {
				if (coke > 0) {
					coke--;
					cout << "Please enjoy your Coke. I wish I could drink soda" << endl;
					state = InsertMoney;
				}
				else if (coke == 0) {
					cout << "We are all sold out of Coke. Sorry" << endl;
					state = ReturnTotal;
				}
			}
			else if (decision == 2) {
				if (pepsi > 0) {
					pepsi--;
					cout << "Please enjoy your Pepsi. It's not like I wanted some Pepsi" << endl;
					state = InsertMoney;
				}
				else if (pepsi == 0) {
					cout << "We are all sold out of Pepsi. Sorry" << endl;
					state = ReturnTotal;
				}
			}
			break;

		case ReturnTotal:
			cout << "Your return is: $" << money << endl;
			state = InsertMoney;
			break;
		}
	}
	system("pause");
	return 0;
}