// VendingMachine source code for Project 3
// Allow users to insert coins and purchase
// candy bars.

public class VendingMachine {

    // Price of candy bar.
    final private int CANDY_BAR_PRICE = 75;

    // Amount deposited for purchase in cents.
    private int amtForPurchase;

    // Number of candy bars currently in vending machine.
    private int numCandyBars;

    // Message displayed after action taken.
    private String message;

    // Constructor for VendingMachine class.
    public VendingMachine( ) {
        this.amtForPurchase = 0;
        this.numCandyBars = 0;
        this.message = "Vending machine initialized.";
    }

    // Getter for amtForPurchase instance variable.
    public int getAmtForPurchase( ) {
        return this.amtForPurchase;
    }

    // Getter for numCandyBars instance variable.
    public int getNumCandyBars( ) {
        return this.numCandyBars;
    }

    // Getter for message instance variable.
    public String getMessage( ) {
        return this.message;
    }

    // Add 5 cents to amount deposited for purchase.
    public void depositNickel( ) {
        this.amtForPurchase += 5;
        this.message = "Nickel deposited.";
    }

    // Add 10 cents to amount deposited for purchase.
    public void depositDime( ) {
        this.amtForPurchase += 10;
        this.message = "Dime deposited.";
    }

    // Add 25 cents to amount deposited for purchase.
    public void depositQuarter( ) {
        this.amtForPurchase += 25;
        this.message = "Quarter deposited.";
    }

    // Purchase candy bar if amount for purchase is enough.
    public void purchaseCandyBar( ) {
        if (this.amtForPurchase >= CANDY_BAR_PRICE &&
            this.numCandyBars > 0) {

            this.amtForPurchase -= CANDY_BAR_PRICE;
            this.numCandyBars--;
            this.message = "Candy bar dispensed";
        }
        else if (this.amtForPurchase < CANDY_BAR_PRICE) {
            this.message = "Insufficient amount to purchase candy bar";
        }
        else {
            this.message = "No candy bars in vending machine";
        }
    }

    // Load more candy bars into vending machine.
    public void loadCandyBars(int candyBarsLoaded) {
        this.numCandyBars += candyBarsLoaded;
    }

    @Override
    public String toString( ) {
        return String.format("%d %d %s",
            this.numCandyBars, this.amtForPurchase, this.message);
    }
}