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

public class Auto extends Applet implements ActionListener
{
        TextField theText[] = new TextField[6];
	TextArea theArea;
	Button theButton;

	public void init()
    	{
		Panel thePanel = new Panel();
		Panel thePanel2 = new Panel();
		Panel thePanel3 = new Panel();
		Panel thePanel4 = new Panel();

		setLayout(new GridLayout(5, 1));
		setFont(new Font("Tahoma", Font.BOLD, 15));
		theArea = new TextArea("Enter the list of random numbers here");
		theArea.setBackground(Color.green);

		thePanel.setBackground(Color.magenta);
		thePanel.setFont(new Font("Tahoma", Font.BOLD, 15));
		thePanel2.setBackground(Color.cyan);
		thePanel.setFont(new Font("Tahoma", Font.BOLD, 15));
		thePanel4.setBackground(Color.orange);

		Label theLabels[] = new Label[10];
		setBackground(Color.white);

		theButton = new Button("Process");
		thePanel3.add(theButton);

		theLabels[0] = new Label("M:  ");
		theLabels[1] = new Label("m:  ");
		theLabels[2] = new Label("i:  ");
		theLabels[3] = new Label("N:  ");
		theLabels[4] = new Label("Pim:  ");
                theLabels[5] = new Label("Qpim:  ");
		theLabels[6] = new Label("Zo:  ");

		theLabels[0].setFont(new Font("Tahoma", Font.BOLD, 18));
		theLabels[1].setFont(new Font("Tahoma", Font.BOLD, 18));
		theLabels[2].setFont(new Font("Tahoma", Font.BOLD, 18));
		theLabels[3].setFont(new Font("Tahoma", Font.BOLD, 18));
		theLabels[4].setFont(new Font("Tahoma", Font.BOLD, 18));
                theLabels[5].setFont(new Font("Tahoma", Font.BOLD, 18));

		theText[0] = new TextField(5);
		theText[1] = new TextField(5);
		theText[2] = new TextField(5);
		theText[3] = new TextField(5);
		theText[4] = new TextField(5);
                theText[5] = new TextField(5);

		theText[4].setEditable(false);
		theText[5].setEditable(false);

		theText[0].setEditable(false);
		theText[3].setEditable(false);

		thePanel.add(theLabels[1]);
		thePanel.add(theText[1]);
		thePanel.add(theLabels[2]);
                thePanel.add(theText[2]);

		thePanel2.add(theLabels[0]);
                thePanel2.add(theText[0]);
		thePanel2.add(theLabels[3]);
                thePanel2.add(theText[3]);

		thePanel4.add(theLabels[4]);
                thePanel4.add(theText[4]);
                thePanel4.add(theLabels[5]);
                thePanel4.add(theText[5]);

		theButton.addActionListener(this);

		add(thePanel);
		add(thePanel2);
		add(thePanel4);
		add(theArea);
		add(thePanel3);

	}

	public void actionPerformed(ActionEvent e)
	{
		StringTokenizer theTokens;
		String temp="";
		int lag=0, index=0;
		int temp1=0, temp2=0, M=0;
		int tokes=0, counter=0;
		Vector theVec = new Vector();
		double Qpim=0, Pim=0, r1=0, r2=0, store=0;
		DecimalFormat format[] = new DecimalFormat[3];
		format[0] = new DecimalFormat("##0.0###");
		format[1] = new DecimalFormat("##0.0###");
		format[2] = new DecimalFormat("##0.0###");

		//get all the data
		try{
			lag = Integer.parseInt(theText[1].getText());
	                index = Integer.parseInt(theText[2].getText());
                        System.out.println("lag "+lag+" "+" index "+index);
		}catch(NumberFormatException nfe){
			theArea.setText("Error information: You did not enter all numeric values.\nPush refresh in the browser and try again.");
		}catch(Exception exe){
			 theArea.setText("Error information: An unknown error has occured.\nPush refresh in the browser and try again.");
		}

		//tokenize
		theTokens = new StringTokenizer(theArea.getText());
		double values[] = new double[theTokens.countTokens()];

		try{
			while(theTokens.hasMoreTokens())
                        {
			        temp = theTokens.nextToken();
				values[tokes++] = Double.parseDouble(temp);
                        }

                 }catch(Exception ede){
			theArea.setText("Error information: An unknown error has occured.\nPush refresh in the browser and try again.");
		 }

                r1 = values[index-1];
		for(counter=index-1;(counter+lag) < values.length; )
		{
			r2 = r1;
			counter += lag;
			r1 = values[counter];
			store += r2 * r1;
		}
                System.out.println(store);
 		//calculate M
                temp1 = lag + index;
                temp2 = tokes - temp1;
                M = (int)temp2/lag;

		//calculate Qpim
                Qpim = Math.sqrt((13*M+7)) / (12*(M+1));

		//caclulate Pim
		Pim = ((1.0/(((double)M)+1.0)) * store) - 0.25;

		//set values
	        theText[3].setText(""+tokes);
		theText[0].setText(""+M);
		theText[5].setText(""+format[0].format(Qpim));
		theText[4].setText(""+format[1].format(Pim));

		String type;
		if(Pim < 0)
			type = "Negative Correlation:  ";
		else
			type = "Positive Correlation:  ";

		double zVal = (Pim/Qpim);

		String pass;
		if(1.96 >= zVal && -1.96 <= zVal)
			pass = "This passes a two-tailed test with an alpha value of 0.05.";
		else
			pass = "This fails a two-tailed test with an alpha value of 0.05.";

		theArea.setText("Important information:  "+ type +""+ format[2].format(zVal)+"\n"+pass);
	}

}