/**
* The purpose of this program is to write a Java program using a GUI. The program should
* calculate and display the mortgage payment amount from user input of the amount of the
* mortgage, the term of the mortgage, and the interest rate of the mortgage. The user should
* be able to loop back and enter new data or quit the program.
*
* References: I have used examples and "go by's" from:
* Chapter 8 of Comprehensive Concepts and Techniques, Shelly, Cashman, Starks, & Mick, (2004);
* Jim Powers' Week 2 Mortgage Calculation program posted in the Team A newsgroup; and
* Various Web sources including Dream in Code.
*/


// Import Utilities */

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.*;

public class Week2PRG421V2 extends JFrame implements ActionListener
{//begin class

    DataOutputStream output;//Per text, p. 8.13, declare output stream

    //Declare variables

    double principal = 0;
    int term = 0;
    double rate = 0;
    double payment = 0;

    //Build graphics - per text, p. 8.13, construct a panel for each row

    JPanel firstRow = new JPanel();
    JPanel secondRow = new JPanel();
    JPanel thirdRow = new JPanel();
    JPanel fourthRow = new JPanel();
    JPanel fifthRow = new JPanel();
    JPanel sixthRow = new JPanel();
    JPanel seventhRow = new JPanel();
    JPanel eighthRow = new JPanel();

    //Per text, p. 8.13, construct a panel for fields and buttons
    JPanel fieldPanel = new JPanel();
    JPanel buttonPanel = new JPanel();

    //Per text, p. 8.13, construct labels and text boxes
    JLabel principalLabel = new JLabel("Loan Principal (No commas or dollar signs please): ");
    JTextField principalNum = new JTextField (15);

    JLabel firstNameLabel = new JLabel("Term of Loan (Yrs): ");
    JTextField firstName = new JTextField(10);
    JTextField lastName = new JTextField(20);

    JLabel addressLabel = new JLabel("Interest Rate (%):");
    JTextField address = new JTextField (35);
    JLabel cityLabel = new JLabel("Your Monthly Payment is: ");
    JTextField city = new JTextField(10);


    //Build buttons
    JButton calculateButton = new JButton("Calculate");
    JButton clearButton = new JButton("Clear");
    JButton exitButton = new JButton("Exit");

    public static void main(String[] args)
    {//begin main ******

        //set the look and feel of the interface
        try
        {//begin try
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
        }//end try

        catch(Exception e)
        {//begin catch
            JOptionPane.showMessageDialog(null,
            "The UIManager could not set the Look and Feel for this application.","Error",
            JOptionPane.INFORMATION_MESSAGE);
        }//end catch

        //configure JFrame object */
        Week2PRG421V2 f = new Week2PRG421V2();

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//set action of exit button on title bar
        f.setSize(450,300); //set size of frame
        f.setTitle("Mortgage Payment Program"); //set desired text on title bar
        f.setResizable(false); //allow or disallow functionality of the resize buttons on the title bar
        f.setLocation(300,200); //set horizontal and vertical position of frame on screen
        f.setVisible(true); //allow the frame to be seen on screen

    }//end main ******

        public Week2PRG421V2()
        {//begin constructor method

            Container c = getContentPane();
            c.setLayout((new BorderLayout()));
            fieldPanel.setLayout(new GridLayout(8,1));
            FlowLayout rowSetup = new FlowLayout(FlowLayout.LEFT,5,3);
            firstRow.setLayout(rowSetup);
            secondRow.setLayout(rowSetup);
            thirdRow.setLayout(rowSetup);
            fourthRow.setLayout(rowSetup);
            fifthRow.setLayout(rowSetup);
            sixthRow.setLayout(rowSetup);
            seventhRow.setLayout(rowSetup);
            eighthRow.setLayout(rowSetup);

            //Add fields to rows
            firstRow.add(principalLabel);
            secondRow.add(principalNum);
            thirdRow.add(firstNameLabel);
            fourthRow.add(firstName);
            fifthRow.add(addressLabel);
            sixthRow.add(address);
            seventhRow.add(cityLabel);
            eighthRow.add(city);

            //Add rows to panel
            fieldPanel.add(firstRow);
            fieldPanel.add(secondRow);
            fieldPanel.add(thirdRow);
            fieldPanel.add(fourthRow);
            fieldPanel.add(fifthRow);
            fieldPanel.add(sixthRow);
            fieldPanel.add(seventhRow);
            fieldPanel.add(eighthRow);

            //Add button to panel
            buttonPanel.setLayout(new FlowLayout(FlowLayout.LEFT, 10, 10));
            button.add(calculateButton);
            button.add(clearButton);
            button.add(exitButton);

            //Add panels to frame
            c.add(fieldPanel, BorderLayout.CENTER);
            c.add(buttonPanel, BorderLayout.SOUTH);

            //Add functionality to buttons ******
            clearButton.addActionListener(this);
            exitButton.addActionListener(this);
            calculateButton.addActionListener(this);

   //End constructor method

        public void actionPerformed(final ActionEvent event)
        { //Begin actionPerformed method ******

            final Object command = event.getSource();

            if(command == calculateButton)
            { //Begin IF statement for calculateButton

            try
                { //Begin TRY statement
                Payment();
                } //End TRY statement

            catch(final NumberFormatException e)
                { //Begin CATCH method
                JOptionPane.showMessageDialog(null, "Invaild Entry! Please Try Again", "ERROR", JOptionPane.ERROR_MESSAGE);
                } //End CATCH method
            } //End IF statement for calculateButton

            if(command == clearButton)
            { //Begin IF statement for clearButton

                principal_txt.setText(null);
                term_txt.setText(null);
                rate_txt.setText(null);
                payment_txt.setText(null);
                displayArea.setText(null);
            } //End IF statement for clearButton

            if(command == exitButton)
            { //Begin IF statement for exitButton
                System.exit(0);
            } //End IF statement for exitButton

        } //End actionPerformed method ******

public void actionPerformed(ActionEvent e)
        {//begin actionPerformed method
        }//end actionPerformed method

}//end  constructor method


}//end class