// Hello.java
//
// Becky's first program.
// Created March 30, 2002, by Becky Wagner with asssistance from Rick Wagner.
// Last updated October 28, 2012 by Rick Wagner.
// Version history:
// Version 1.03, updated March 31, 2002.
// Version 1.04, October 28, 2012, adds a few more comments.
// Version 1.05, November 8, 2012, replaces deprecated action events with ActionListener.
// Copyright 2002-2012, all rights reserved. 

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

public class Hello extends Applet
{
  private Dimension dApplet = null;                        // The applet panel size (read from the html file)
  private Label lblMessage = null;
  private TextArea taOutput = null;
  private int iNumDates = 20;                              // The number of dates for sorting
  private int iArray[] = new int[iNumDates];               // Array of integers
  private Button btnScrambleArray = null;
  private Button btnSortArray = null;
  private ActionListener al = new alButtonEvents();

  public void init()
  {
    // Set the background color:
    setBackground(Color.lightGray);

    // Get the applet dimensions:
    dApplet = getSize();

    // Add the message label:
    lblMessage = new Label("Hello. Welcome to Becky's World!");
    lblMessage.setAlignment(Label.CENTER);
    add(lblMessage);

    // Add the text area:
    taOutput = new TextArea(20, 40);
    taOutput.setEditable(true);
    add(taOutput);    

    // Add the scramble button:
    btnScrambleArray = new Button("Scramble Dates");
    add(btnScrambleArray);
    btnScrambleArray.setActionCommand("Scramble Dates");  // Defaults to the button name.
    btnScrambleArray.addActionListener(al);

    // Add the sort button:
    btnSortArray = new Button("Sort Dates");
    add(btnSortArray);    
    btnSortArray.setActionCommand("Sort Dates");          // Defaults to the button name.
    btnSortArray.addActionListener(al);
  } // End of init()

  public void start()
  {
    int i = 0;
    int iRand = 0;

    for (i = 0; i < iNumDates; i++)                                       // Set random dates over a 200 year range.
    {
      iRand =  1800 + (int) (Math.random() * 200);
      iArray[i] = iRand;
    }
  } // End of start()

  // Code for displaying images or drawing in the applet frame
  public void paint(Graphics g)
  {
    // Draw a recessed frame around the applet border. Designed for gray-on-gray browser background.
    g.setColor(Color.black);
    g.drawLine(0, 0, dApplet.width - 1, 0);
    g.drawLine(0, 0, 0, dApplet.height - 1);
    g.setColor(Color.white);
    g.drawLine(0, dApplet.height - 1, dApplet.width - 1, dApplet.height - 1);
    g.drawLine(dApplet.width - 1, 1, dApplet.width - 1, dApplet.height - 1);

  } // End of paint()

  class alButtonEvents implements ActionListener
  {
    public void actionPerformed(ActionEvent ae)
    {
      String s = ae.getActionCommand();
      int i = 0;
      int j = 0;
      int iTemp = 0;                                                       // Swap space.
      int iRand = 0;

      if (s.equals("Scramble Dates"))
      {
        taOutput.setText("");

        for (i = 0; i < iNumDates - 1; i++)
        {
          iRand =  i + 1 + (int) (Math.random() * (iNumDates - 1 - i));
          System.out.println("Rand = " + iRand);
          iTemp = iArray[i];
          iArray[i] = iArray[iRand];
          iArray[iRand] = iTemp;
        }

        for (i = 0; i < iNumDates; i++)
        {
          taOutput.append(Integer.toString(iArray[i]) + "\n");
        }
      }

      if (s.equals("Sort Dates"))
      {
        for (i = 0; i < iNumDates - 1; i++)
        {
          for (j = i + 1; j < iNumDates; j++)
          {
            if (iArray[j] < iArray[i])
            {
              // Swap!
              iTemp = iArray[j];
              iArray[j] = iArray[i];
              iArray[i] = iTemp;
            }
          }
        }
        taOutput.setText("");
        for (i = 0; i < iNumDates; i++)
        {
          taOutput.append(Integer.toString(iArray[i]) + "\n");
        }
      }
    }  // End of actionPerformed()
  }  // End of class alButtonEvents

} // End of Applet class