import java.awt.*;
import java.awt.event.*;
import java.lang.reflect.*;
import java.net.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;

class FinalCalcPanel extends JPanel
{  
    public FinalCalcPanel()
    {  
	mainPanel = new JPanel();
	mainPanel.setLayout(new GridLayout(7, 2));
	add(mainPanel, BorderLayout.CENTER);

	final JComboBox testnumCombo = new JComboBox();
	testnumCombo.addItem("0");	
	testnumCombo.addItem("1");
	testnumCombo.addItem("2");
	testnumCombo.addItem("3");
	JLabel testnumLabel = new JLabel("Number of Tests to Replace:");
	mainPanel.add(testnumLabel);
	mainPanel.add(testnumCombo);
	testnumCombo.setSelectedIndex(1);

	final JFormattedTextField intTest1 = new JFormattedTextField(NumberFormat.getIntegerInstance());
	addRow("Test 1=", intTest1);
	
	final JFormattedTextField intTest2 = new JFormattedTextField(NumberFormat.getIntegerInstance());
	addRow("Test 2=", intTest2);
	
	final JFormattedTextField intTest3 = new JFormattedTextField(NumberFormat.getIntegerInstance());
	addRow("Test 3=", intTest3);
	
	final JFormattedTextField intHw = new JFormattedTextField(NumberFormat.getIntegerInstance());
	intHw.setValue(new Integer(100));
	addRow("Homework/Quiz=", intHw);
	
	final JComboBox desiredgradeCombo = new JComboBox();
	desiredgradeCombo.addItem("A");
	desiredgradeCombo.addItem("B");
	desiredgradeCombo.addItem("C");
	desiredgradeCombo.addItem("D");
	JLabel desiredgradeLabel = new JLabel("Desried grade:");
	mainPanel.add(desiredgradeLabel);
	mainPanel.add(desiredgradeCombo);
	desiredgradeCombo.setSelectedIndex(2);
	
	final JFormattedTextField dblFinal = new JFormattedTextField(NumberFormat.getInstance());
	addRow("Grade needed on final=", dblFinal);
	
	JPanel buttonPanel = new JPanel();
	calcButton = new JButton("Calculate");
	clearButton = new JButton("Clear All");
	buttonPanel.add(calcButton);
	buttonPanel.add(clearButton);
	add(buttonPanel, BorderLayout.SOUTH);	


	calcButton.addActionListener(new ActionListener()
	    {
		public void actionPerformed(ActionEvent ae)
		{
		    //System.out.println("You pressed the Calculate button.");
		    double t1=Double.parseDouble(intTest1.getText());
		    double t2=Double.parseDouble(intTest2.getText());
		    double t3=Double.parseDouble(intTest3.getText());
		    double h=Double.parseDouble(intHw.getText());
		    //double g=Double.parseDouble(intGrade.getText());
		    int tn=1;
		    String stn=(String) testnumCombo.getSelectedItem();
		    int g=100;
		    String sg=(String) desiredgradeCombo.getSelectedItem();
		    double finalgrade;

		    //number of tests to replace
		    if(stn.equals("0"))
			{
			    tn = 0;
			}
		    else if(stn.equals("1"))
			{
			    tn = 1;
			}
		    else if(stn.equals("2"))
			{
			    tn = 2;
			}	
		    else if(stn.equals("3"))
			{
			    tn = 3;
			}
		    //converts letter grade to numeric grade for desired grade
		    if(sg.equals("A"))
			{
			    g = 90;
			}
		    else if(sg.equals("B"))
			{
			    g = 80;
			}
		    else if(sg.equals("C"))
			{
			    g = 70;
			}	
		    else if(sg.equals("D"))
			{
			    g = 60;
			}
		    finalgrade=FinalCalcEngine.FinalCalc(t1,t2,t3,h,g,tn);
		    dblFinal.setValue(finalgrade);
		}
	    });
	
	clearButton.addActionListener(new ActionListener()
	    {
		public void actionPerformed(ActionEvent ae)
		{
		    //System.out.println("You pressed the Clear button.");
		    intTest1.setValue(null);
		    intTest2.setValue(null);
		    intTest3.setValue(null);
		    intHw.setValue(100);
		    testnumCombo.setSelectedIndex(1);
		    desiredgradeCombo.setSelectedIndex(2);
		    dblFinal.setValue(null);
		}
	    });
    }
    
         
    
    public void addRow(String labelText, final JFormattedTextField field)
    {
	mainPanel.add(new JLabel(labelText));
	mainPanel.add(field);
	//final JLabel valueLabel = new JLabel();
	//mainPanel.add(valueLabel);
    }
    

    //remove for applet
    //public static final int WIDTH = 550;
    //public static final int HEIGHT = 250;
    
    private JButton calcButton;
    private JButton clearButton;
    private JPanel mainPanel;
}

class FinalCalcEngine
{
    public static double FinalCalc(double t1,double t2,double t3,double h,double g,int tn)
    {
	//array to hold test scores
	double[] test=new double[3];
	//test average
	double tavg;
	double hw;
	double grade;
	int testnum;
	double finalgrade;

	test[0]=t1;
	test[1]=t2;
	test[2]=t3;
	hw=h;
	grade=g;
	testnum=tn;

	//sorts the test scores
	Arrays.sort(test);

	tavg=(test[0]+test[1]+test[2])/3;
	finalgrade=(grade-.5*tavg-.1*hw)/.4;

	if(testnum==1)
	    {
		if(finalgrade > test[0])
		    {
			finalgrade=Replace.one(test,grade,hw);
			test[0]=finalgrade;
		    }
	    }
	else if(testnum==2)
	    {
		if(finalgrade > test[0])
		    {
			finalgrade=Replace.one(test,grade,hw);
			test[0]=finalgrade;
			if(finalgrade > test[1])
			    {
				finalgrade=Replace.two(test,grade,hw);
				test[0]=finalgrade;
				test[1]=finalgrade;
			    }
		    }
	    }
	else if(testnum==3)
	    {
		if(finalgrade > test[0])
		    {
			finalgrade=Replace.one(test,grade,hw);
			test[0]=finalgrade;
			if(finalgrade > test[1])
			    {
				finalgrade=Replace.two(test,grade,hw);
				test[0]=finalgrade;
				test[1]=finalgrade;
				if(finalgrade > test[2])
				    {
					finalgrade=Replace.all(test,grade,hw);
					test[0]=finalgrade;
					test[1]=finalgrade;
					test[2]=finalgrade;
				    }
			    }
		    }
	    }
	
	return finalgrade;
    }
}
class Replace
{
    public static double one(double[] t,double g,double h )
    {
	return (30*g-5*(t[1]+t[2])-3*h)/17;
    }
    public static double two(double[] t,double g,double h )
    {
	return (30*g-5*t[2]-3*h)/22;
    }
    public static double all(double[] t,double g,double h )
    {
	return (10*g-h)/9;
    }
}