//Sam Partovi                          CS1A                   Ch. 11, P.648, #13
/*******************************************************************************
* SIMULATE DRINK MACHINE
* ____________________________________________________________
* This program simulates a drink vending machine that accepts drink choice and
* money given to the machine.
* ____________________________________________________________
*INPUT
* name          : Drink name
* cost          : Cost of drink
* numInMachine  : Drink quantity in stock
* moneyInserted : Money given to machine
*OUTPUT
* Menus that allow for selection and purchase of drinks
*******************************************************************************/
#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

// Structure definition for Drink
struct Drink {
    string name;
    double cost;
    int numInMachine;
};

// Function to display the drink menu
void displayMenu(Drink drinks[], int size) {
    cout << "Available Drinks:" << endl;
    for (int i = 0; i < size; i++) {
        cout << i + 1 << ". " << drinks[i].name << " - $" << fixed << 
                setprecision(2) << drinks[i].cost;
        if (drinks[i].numInMachine == 0)
            cout << " (Sold Out)";
        cout << endl;
    }
    cout << "99. Quit and Display Machine Earnings" << endl;
}

// Main function
int main() {
    // Array of 5 drinks
    Drink drinks[5] = {
        {"Cola", 0.75, 20},
        {"Root Beer", 0.75, 20},
        {"Lemon-Lime", 0.75, 20},
        {"Grape Soda", 0.80, 20},
        {"Cream Soda", 0.80, 20}
    };

    int choice;
    double moneyInserted;

    do {
        displayMenu(drinks, 5);

        cout << "Select a drink (1-5) or type 99 to quit: ";
        cin >> choice;

        if (choice >= 1 && choice <= 5) {
            if (drinks[choice - 1].numInMachine == 0) {
                cout << "Sorry, " << drinks[choice - 1].name << 
                        " is sold out." << endl;
                continue; // Skip the rest of the loop for this iteration
            }

            // Get money from user
            do {
                cout << "Insert money ($0 to $1): ";
                cin >> moneyInserted;

                if (moneyInserted < 0 || moneyInserted > 1) {
                    cout << "Invalid amount. Please insert money between $0 and" 
                            "$1." << endl;
                }
            } while (moneyInserted < 0 || moneyInserted > 1);

            if (moneyInserted >= drinks[choice - 1].cost) {
                double change = moneyInserted - drinks[choice - 1].cost;
                cout << "Dispensing " << drinks[choice - 1].name << ". Your "
                "change is $" << fixed << setprecision(2) << change << endl;
                drinks[choice - 1].numInMachine--;
            } else {
                cout << "Not enough money inserted. Returning $" << fixed << 
                        setprecision(2) << moneyInserted << endl;
            }
        } else if (choice != 99) {
            cout << "Invalid selection! Please select a valid option." << endl;
        }

    } while (choice != 99); // End of the main loop

    return 0;
}