//CokeMachine.java
//David Root
//Programming II
//Project 2
//1 DEC 99

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


public class CokeMachine extends Applet implements ActionListener { 

/*Coke machine will simulate a soda machine, with buttons for Coke, Rootbeer and 
gingerale.  Also, there will be a coin return button, and textfields for total 
coins deposited and what soda is distributed.  
*/

    private TextField txtPrice, txtCoin, txtReturn, txtCanDrop,
                      txtTotalDeposit;
    private Button[] sodaButtons;
    private Button btnCoinReturn;
    private String[] soda = {"COKE","GINGER-Ale","ROOT BEER","empty","empty"};
    private int select=1;
    private boolean valid=false;
    static  int totalCoin=0;
    static  int coin=0;
    static int price=60;
    static String coinString;


    //Set up the layout for the panels/buttons
    public void init() {
      setLayout(new BorderLayout());

     // Put coin slot, total deposited windows in
        Panel pn = new Panel();
        pn.setLayout(new FlowLayout());
	txtTotalDeposit = new TextField(15);
        txtTotalDeposit.setEditable(false);
        txtTotalDeposit.setText("Price ."+price);
        pn.add(new Label("TOTAL:"));
        pn.add(txtTotalDeposit);
	
        txtCoin = new TextField(5);
	txtCoin.setEditable(true);
        txtCoin.addActionListener(this);
	pn.add(new Label("COIN SLOT:"));
        pn.add(txtCoin);	 
        
        add("North", pn);

      //Add the drink selection buttons
        Panel pc = new Panel();
        pc.setLayout(new GridLayout(3,2));
	
        sodaButtons = new Button[soda.length];
        
        for (int i=0; i < soda.length; i++) {
	  sodaButtons[i] = new Button(soda[i]);
          sodaButtons[i].addActionListener(this);
          pc.add(sodaButtons[i]);
        }	
      
      //Add the Coin Return Button  
        btnCoinReturn = new Button("COIN RETURN");
        btnCoinReturn.addActionListener(this);
        pc.add(btnCoinReturn);

	add ("Center", pc);

       //Add the can distribution field
	 Panel ps = new Panel();
	 ps.setLayout(new FlowLayout());
	 txtCanDrop = new TextField(15);
	 txtCanDrop.setEditable(false);
	 ps.add(new Label("CAN SLOT:"));
	 ps.add(txtCanDrop);

       //Add the Change return
	 txtReturn = new TextField(5);
	 txtReturn.setEditable(false);
	 ps.add(new Label("Coin Return:"));
	 ps.add(txtReturn);

	 add ("South",ps);
      

    }
   //Look for apecific action, coin drop, coin return, etc.
    public void actionPerformed(ActionEvent e) {
     
         Object source = e.getSource();
      
         if (source == txtCoin) {
           System.out.println("at txtCoin"); //debug comment
           saleReset();
           validate();
            if (valid) calcCoin();
          }
         else
           if (source == btnCoinReturn) returnMoney();
         else
           selectSoda(e.getActionCommand());
             
    }

   //Reset method prior to sale
     public void saleReset() {
      System.out.println("RESET");  //debug comment
      txtCanDrop.setText("");
      txtReturn.setText("");
      
    }

   //Reset method after sale or coin return
     public void postSale() {
       System.out.println("postSale");  //debug comment
       txtCoin.setText("");
       txtTotalDeposit.setText("Price: ."+price);
       totalCoin = 0;
       coin = 0;
       valid=false;
     }

   //Validate Method to check coins deposited
     public void validate() {
       coinString = txtCoin.getText();
       System.out.println("Validate");  //debug comment
       
       if(! coinString.equals("")) {
       coin = new Integer(coinString.trim()).intValue();  
     
         if(coin==5 | coin==10 | coin==25 | coin==100) valid=true;
          else {
            valid=false;
            txtCanDrop.setText("Invalid Coin");
            txtReturn.setText(""+coin);
            txtCoin.setText("");
          }
        }
      }
   //Method to calculate coins deposited
     public void calcCoin() {
        
        totalCoin = totalCoin + coin;
        if (totalCoin==100) txtTotalDeposit.setText("1.00");
          else
            if (totalCoin==5) txtTotalDeposit.setText(".05");
              else txtTotalDeposit.setText("."+(totalCoin));

        txtCoin.setText("");
        System.out.println("Post Calc"); //debug comment
        
        if(totalCoin >= price) {
           valid = true;
           txtTotalDeposit.setText("MAKE SELECTION");
	
         }
          
     }
   //Coin Return method
     public void returnMoney() {
       System.out.println("Coin return1");   //debug comment
       if (totalCoin==100) txtReturn.setText("1.00");
         else  
          if (totalCoin==5) txtReturn.setText(".05");
            else txtReturn.setText("."+(totalCoin));       
       System.out.println("Coin return2"); //debug comment
       postSale();
     }


   //Soda selection method
     public void selectSoda(String pop) {
     select = 0;
     while(!pop.equals(soda[select])) select++;

     if (! soda[select].equals("empty")) {

       if (totalCoin>=price) {
         txtCanDrop.setText(soda[select]);
       
        if (totalCoin >price) {
            if ((totalCoin-price)==5) txtReturn.setText(".05");
              else
                txtReturn.setText("."+(totalCoin-price));
            
            }
          postSale();
        }
      }
    }      

}