//======================================================================
//  PROJECT:            _programming.java_
//  FILE:               SodaPop.java
//  PURPOSE:            Chapter 5 lablet
//  VERSION:            1.1
//  TARGET:             Java v1.1
//  UPDATE HISTORY:     1.1     10/2/98     new documentation and 1.1 compliance
//                      1.0     10/9/97     the version in _p.j_
//======================================================================

//------------------------------- NOTES --------------------------------
/*
    We've simplified this applet from the one in the text by splitting
    off the money-related buttons into a separate class.
	
    We're back to an applet that actually does something.  Don't worry
    about the details of event handling, but in brief we've made a class
    we call Listener that receives events generated by clicks in the buttons
    and then calls the appropriate method in the SodaPop class.  As a
    consequence of this organization, we must write a collection of methods
    (like processNickelButton() and processColaButton()) that will be called
    from the Listener object, in much the same way that init() and paint()
    are called from outside the applet.
*/

//------------------------------ IMPORTS -------------------------------

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

//=========================== SodaPop CLASS ============================

/**
 * This class simulates a soda machine.  It is organized into two
 * functional parts: a panel on the left that simulates insertion
 * of coins and a panel on the right that "dispenses" a soda (by
 * placing an appropriate message in the display at the bottom)
 * if the user has inserted a sufficient amount of money.
 */
public class SodaPop extends Applet
{
    //------------------------------ DATA ------------------------------
					
   	private MoneyPanel  money;         // to simulate coin insertion and return
    private ChoicePanel choices;       // for drink selection buttons
    private TextField   display;       // for status messages
	
    private int         amount,        // amount available for purchase 
                        cost,          // price of a drink
                        numberColas;   // colas currently on hand
	
    private Listener    myListener = new Listener(this);
	
    //----------------------- THE USUAL METHODS ------------------------
	
    /**
     * Lay out the two control panels and set the initial values
     * for the cost of a soda and the number of colas remaining.
     */
    public void init()
    {
        setLayout(new BorderLayout());
        setBackground(Color.red);

        choices = new ChoicePanel(myListener);
        add("East", choices);
		
        money = new MoneyPanel(myListener);
        add("West", money);

        display = new TextField();
        display.setBackground(Color.white);
        display.setForeground(Color.red);
        display.setFont(new Font("Helvetica", Font.BOLD, 12));
        add("South", display);
		
        cost = 75;
        numberColas = 5;			
    }
	
    /**
     * Paint the logo in the middle of the applet's frame.
     */
    public void paint(Graphics g)
    {
    	Dimension d = getSize();
        int xStart = d.width / 2 - 20;
        int yStart = d.height / 2 - 80;
		
        g.setFont(new Font("TimesRoman", Font.BOLD, 36));
        g.setColor(Color.white);
        g.drawString("S", xStart, yStart);
        g.drawString("O", xStart, yStart + 20);
        g.drawString("D", xStart, yStart + 40);
        g.drawString("A", xStart, yStart + 60);
        g.drawString("P", xStart, yStart + 80);
        g.drawString("O", xStart, yStart + 100);
        g.drawString("P", xStart, yStart + 120);
		
        g.setFont(new Font("TimesRoman", Font.ITALIC, 18));
        g.setColor(Color.white);
        g.drawString("Insert 75 cents ...", xStart - 20, yStart + 160);
    }
	
    //--------------- OUR OWN METHODS TO RESPOND TO CLICKS -------------
	
    /**
     * Deal with a click on the nickel button.
     */
    void processNickelButton()
    {
        display.setText("Nickel inserted...");
        amount += 5;
    }

    /**
     * Deal with a click on the dime button.
     */
    void processDimeButton()
    {
        display.setText("Dime inserted...");
        amount += 10;
    }

    /**
     * Deal with a click on the quarter button.
     */
    void processQuarterButton()
    {
        display.setText("Quarter inserted...");
        amount += 25;
    }

    /**
     * In response to a click on the return button,
     * display the amount returned and set the amount
     * back to zero.
     */
    void processReturnButton()
    {
        String amountString;
        int dollars = amount / 100;
        int pennies = amount % 100;
		
        if (pennies < 10)
        {
            amountString = new String("$" + dollars + ".0" + pennies);
        }
        else
        {
            amountString = new String("$" + dollars + "." + pennies);
        }
        display.setText(amountString + " returned.");
        amount = 0;
    }

    /**
     * Try to "sell" a cola.
     */
    void processColaButton()
    {
        if (amount >= cost)
        {
            display.setText("COLA dispensed!!!");
            amount -= cost;
            numberColas--;
        }
        if (numberColas <= 0)
        {
            choices.disable("COLA");
        }
    }

    /**
     * Try to "sell" a diet soda.
     */
    void processDietButton()
    {
        if (amount >= cost)
        {
            display.setText("DIET dispensed!!!");
            amount -= cost;
        }
    }

    /**
     * Try to "sell" a caffein-free, sugarless, acid-free, clear soda
     * (sometimes called "water").
     */
    void processLiteButton()
    {
        if (amount >= cost)
        {
            display.setText("LITE dispensed!!!");
            amount -= cost;
        }
    }

    /**
     * Try to "sell" a root beer.
     */
    void processRootButton()
    {
        if (amount >= cost)
        {
            display.setText("ROOT dispensed!!!");
            amount -= cost;
        }
    }
}

//========================= MoneyPanel CLASS ===========================
/**
 * This class is primarily for display purposes in the SodaPop applet.
 * It is, basically, a holder for the four money-related buttons.
 * It does do some event-handling in response to button clicks, but  
 * for the purposes of this lab, you can ignore anything that has the
 * word "Listener" in it.
 */
class MoneyPanel extends Panel
{
    private Button bNickel = new Button("Nickel"),
            bDime = new Button("Dime"),
            bQuarter = new Button("Quarter"),
            bReturn = new Button("Return Coins");
					
    /**
     * Lay out the nickel, dime, and quarter buttons in a 3-by-1
     * grid and then place them and the return button in a 
     * 2-by-1 grid (giving a really big return button).
     */
    public MoneyPanel(Listener theListener)
    {
        bNickel.addActionListener(theListener);
        bDime.addActionListener(theListener);
        bQuarter.addActionListener(theListener);
        bReturn.addActionListener(theListener);
		
        setBackground(Color.blue);
        setForeground(Color.white);

        setLayout(new GridLayout(2,1, 5, 5));

        Panel p = new Panel();
        p.setLayout(new GridLayout(3,1, 5, 5));
        p.add(bNickel);
        p.add(bDime);
        p.add(bQuarter);
		
        add(p);
        add(bReturn);
    }
}

//========================= ChoicePanel CLASS ==========================
/**
 * Like the MoneyPanel class, this class is primarily a 
 * holder for the four drink buttons.  Again, pay no attention
 * to anything with the word "Listener" in it.
 */
class ChoicePanel extends Panel
{
    private Button bCola = new Button("COLA"),
            bDiet = new Button("DIET"),
            bLite = new Button("LITE"),
            bRoot = new Button("ROOT BEER");
					
    /**
     * Construct a new ChoicePanel object by setting
     * the colors and layout and then adding the four
     * drink buttons.
     */
    public ChoicePanel(Listener theListener)
    {
        bCola.addActionListener(theListener);
        bDiet.addActionListener(theListener);
        bLite.addActionListener(theListener);
        bRoot.addActionListener(theListener);
		
        setBackground(Color.blue);
        setForeground(Color.white);	
        setLayout(new GridLayout(4,1));

        add(bCola);
		add(bDiet);
        add(bLite);
        add(bRoot);
    }
    
    /**
     * Turn off one of the buttons.
     */
    public void disable(String name)
    {
        if (name.equals("COLA"))
        {
            bCola.setEnabled(false);
        }
    }
}

//=========================== Listener CLASS ===========================
/**
 * This class is designed to respond to button clicks
 * from the various buttons in our applet by calling
 * the applet's appropriate process() function.
 * For now, it's not necessary to understand what's
 * going on here--all will be made clear in Chapter 6.
 */
class Listener implements ActionListener
{
    private SodaPop theApplet;

    /*
     * Construct a Listener object by registering
     * the applet that will be responding to the
     * events (so this object knows the SodaPop
     * object that owns the "process..." functions).
     */
    public Listener(SodaPop theBigBoss)
    {
        theApplet = theBigBoss;
    }
	
    public void actionPerformed(ActionEvent e)
    {
        String bttnName = e.getActionCommand();
		
        //------ Deal with clicks on the money buttons -----
		
        if (bttnName.equals("Nickel"))
        {
            theApplet.processNickelButton();
        }
        else if (bttnName.equals("Dime"))
        {
            theApplet.processDimeButton();
        }
        else if (bttnName.equals("Quarter"))
        {
            theApplet.processQuarterButton();
        }
        else if (bttnName.equals("Return Coins"))
        {
            theApplet.processReturnButton();
        }
		
        //------ Deal with clicks on the soda buttons ------
		
        if (bttnName.equals("COLA"))
        {
            theApplet.processColaButton();
        }
        else if (bttnName.equals("DIET"))
        {
            theApplet.processDietButton();
        }
        else if (bttnName.equals("LITE"))
        {
            theApplet.processLiteButton();
        }
        else if (bttnName.equals("ROOT BEER"))
        {
            theApplet.processRootButton();
        }
    }
}