//Amortization6 .java

import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;

public class Amortization6 implements ActionListener, ItemListener
{
	JTextField principal,length,rate;
	JComboBox terms;
	JScrollPane scroller;
	JRadioButton jrb1 = new JRadioButton("Enter your data");
	JRadioButton jrb2 = new JRadioButton("Use predefined");
	ButtonGroup bg = new ButtonGroup();
	JLabel termText = new JLabel("Term");
	JFrame frame = new JFrame("Amortization Calculator");
	int i=0;
	Object source;
	int selected;
	ItemEvent e1;
        JButton calcButton = new JButton("Calculate");
        JButton reset = new JButton("Reset");
        String[] columnNames = {"Month","Payment","Principal Paid","Interest Paid","Total Interest","Balance"};
	Object[][] data = { {"0","0","0","0","0","0"} };

	public void itemStateChanged(ItemEvent e) //handling event of radio buttons for selection and deselection
	{
		source = e.getItemSelectable();e1=e;
		if (source == jrb1)	
		{	if(i==1)
			{frame.setVisible(false);Amortization6 am1 = new Amortization6();am1.createAndShowGUI();}
			if (e.getStateChange() == ItemEvent.SELECTED)  /////////////////////////////////////determining if first radio button selected
			 {
            				length.setEditable(true);		////////////////////////////////////making user input editable
				rate.setEditable(true);
				terms.setVisible(false);		////////////////////////////////////making LABEL INVISIBLE
				termText.setVisible(false); 		////////////////////////////////////making drop down list invisible
       			 }
			else if (e.getStateChange() == ItemEvent.DESELECTED) /////////////////////////////////////determining if first radio button deselected
			{
				length.setEditable(false);
				rate.setEditable(false);
			}
		}
		else if (source == jrb2)	
		{	
			if (e.getStateChange() == ItemEvent.SELECTED) /////////////////////////////////////determining if second radio button selected
			 {
            				length.setEditable(false);
				rate.setEditable(false);
				terms.setVisible(true);
				termText.setVisible(true);
       			 }
			else if (e.getStateChange() == ItemEvent.DESELECTED) /////////////////////////////////////determining if second radio button deselected
			{
				length.setEditable(true);
				rate.setEditable(true);
				
			}
		}
	}
	public void calculate() 
	{
		int months = 84;
		double interest = 0.0535,balance;
		DecimalFormat monetary = new DecimalFormat("$#,###.00");  //sets the format of output		
		try {
			 try{
			balance = Double.parseDouble(principal.getText());  //convert text bos data to double data type
                        }catch(Exception e)
                                {
                                     JOptionPane.showMessageDialog(null,"Invalid input detected. Enter correct values. \nOriginal error "+e);
                                     return;
                                }
			System.out.println(balance);
			if((source == jrb1)&&(e1.getStateChange() == ItemEvent.SELECTED))	 /////////////////////////////////////determining which radio button is selected
			{       try{
				months = (Integer.parseInt(length.getText())*12);
				 interest = (Double.parseDouble(rate.getText())/100);
                                }catch(Exception e)
                                {
                                     JOptionPane.showMessageDialog(null,"Invalid input detected. Enter correct values. \nOriginal error "+e);
                                     return;
                                }
			}
			else if((source == jrb2)&&(e1.getStateChange() == ItemEvent.SELECTED))	 /////////////////////////////////////determining which radio button is selected
			{
			
				
				switch (terms.getSelectedIndex()) // operation on the basis of user selection  7/15/30 years and set interest rate
				{
					case 0:
						months = 84;
						interest = 0.0535;
						break;
					case 1:
						months = 180;
						interest = 0.055;
						break;
					case 2:
						default:
						months = 360;
						interest = 0.0575;
						break;
				}
			}
				String[] columnNames = {"Month","Payment","Principal Paid","Interest Paid","Total Interest","Balance"}; // Data Grid headings
				Object[][] data = new Object[months][6];
				double monthlyInterest = interest / 12.0;
				double totalInterest = 0.0;
				 //calculating interests and moth payments
				double monthlyPayment = balance * ((monthlyInterest * Math.pow(1.0 + monthlyInterest, months)) / (Math.pow(1.0 + monthlyInterest, months) - 1.0));
				for (int j = 0; j < months; j++) 
				{
					double interestThisPeriod = balance * monthlyInterest;
					totalInterest = totalInterest + interestThisPeriod;
					balance = balance - monthlyPayment + interestThisPeriod;
					data[j][0] = ""+(j+1);
					data[j][1] = monetary.format(monthlyPayment);
					data[j][2] = monetary.format(monthlyPayment-interestThisPeriod);
					data[j][3] = monetary.format(interestThisPeriod);
					data[j][4] = monetary.format(totalInterest);
					data[j][5] = monetary.format(balance);
				}
				JTable table = new JTable(data, columnNames);
				scroller.setViewportView(table);
			
		} catch (Exception e) {}			
	}

	public void addComponentsToPane(Container contentPane) //All view
	{
		// Any number of rows and 2 columns
		contentPane.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();

		jrb1.addItemListener(this);
		jrb2.addItemListener(this);

		bg.add(jrb1);
		bg.add(jrb2);
		
		
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 0;
		contentPane.add(new JLabel("Principal:"), c);
		
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 1;
		c.gridy = 0;
		principal = new JTextField();
		contentPane.add(principal, c);
		
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 1;
		contentPane.add(jrb1, c);
		
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 1;
		c.gridy = 1;
		contentPane.add(jrb2, c);
		
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 2;
		contentPane.add(new JLabel("Enter Lenght in Years:"), c);

		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 1;
		c.gridy = 2;
		length = new JTextField();
		contentPane.add(length, c);

		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 3;
		contentPane.add(new JLabel("Enter interest rate:"), c);

		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 1;
		c.gridy = 3;
		rate = new JTextField();
		contentPane.add(rate, c);
		

		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 6;
		contentPane.add(termText, c);
		terms = new JComboBox();
		terms.addItem("7 years at 5.35%");
		terms.addItem("15 years at 5.5%");
		terms.addItem("30 years at 5.75%");
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 1;
		c.gridy = 6;
		contentPane.add(terms, c);
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 7;
		c.gridwidth = 2;
		
                JPanel jp = new JPanel();
                jp.add(calcButton);jp.add(reset);
		calcButton.addActionListener(this);
                reset.addActionListener(this);
		contentPane.add(jp, c);

		scroller = new JScrollPane();
		c.fill = GridBagConstraints.HORIZONTAL;
		c.gridx = 0;
		c.gridy = 8;
		c.gridwidth = 2;
		c.gridheight = 2;
		
		JTable table = new JTable(data, columnNames);
		table = new JTable(data, columnNames);
		scroller.setViewportView(table);
		contentPane.add(scroller, c);
	}
	public void createAndShowGUI() 
	{
		//JFrame frame = new JFrame("Amortization Calculator");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//Set up the content pane and components in GridLayout
		addComponentsToPane(frame.getContentPane());
		frame.pack();
		frame.setVisible(true);
	}
	public static void main(String[] args) 
	{
		final Amortization6 am = new Amortization6();
		javax.swing.SwingUtilities.invokeLater(new Runnable() 
		{
			public void run() 
			{
				am.createAndShowGUI();
			}
		});
	}

	public void actionPerformed(ActionEvent e) 
	{
		String cmd = e.getActionCommand();
                if(cmd.equalsIgnoreCase("Reset"))
                {
                    principal.setText("");
                    length.setText("");
                    rate.setText("");
                    JTable table = new JTable(data, columnNames);
                    table = new JTable(data, columnNames);
                    scroller.setViewportView(table);
                    return;
                }
		i=1;
		calculate();
	}
}