/*
	This is the conversion for temperature
	
*
*/


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

public class ConvertTemperature extends JFrame
{
	private JPanel mainpanel, txtpanel, buttonpanel, labelpanel;
	private JButton convert, exit, back, clear;
	private JTextField txtfield;
	private JLabel title;
	private JComboBox jcombo;
	private double number;
	private double fDegree = 0.0, cDegree = 0.0;
	private boolean value = true;
	
	public ConvertTemperature()
	{
		// Sets the title of the window
		
		setTitle("Convert Temperature");
		
		// Sets the size of the window
		
		setSize(400, 400);
		
		// Sets the start location of the window
		
		setLocationRelativeTo(null);
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		// Creates a main panel & set the layout to border layout
		
		mainpanel = new JPanel();
		mainpanel.setLayout(new BorderLayout());
		
		// Creates a text panel
		
		txtpanel = new JPanel();
		
		// Create a label
		
		title = new JLabel("Convert From");
		
		// Creates a text field
		
		txtfield = new JTextField("", 20);
		
		// Create a JCombo Box
		
		jcombo = new JComboBox();
		
		// Add items to the JCombo Box
		
		jcombo.addItem("°F");
		jcombo.addItem("°C");
	
		// Add the text area, JCombo & the label to the text panel
		
		txtpanel.add(title);
		txtpanel.add(txtfield);
		txtpanel.add(jcombo);
		
		// Add the text panel to the main panel
		
		mainpanel.add(txtpanel, BorderLayout.NORTH);

		// Create the buttons
		
		convert = new JButton("Convert");
		exit = new JButton("Exit");
		back = new JButton("Back");
		clear = new JButton("Clear");
		
		// Add the buttons to the panel
		
		buttonpanel = new JPanel();
		
		buttonpanel.add(convert);
		buttonpanel.add(exit);
		buttonpanel.add(clear);
		buttonpanel.add(back);
		
		// Create the action listener for the buttons
		
		convert.addActionListener(new ButtonListener());
		exit.addActionListener(new ButtonListener());
		back.addActionListener(new ButtonListener());
		clear.addActionListener(new ButtonListener());
		
		// Add the button panel to the main panel
		
		mainpanel.add(buttonpanel, BorderLayout.SOUTH);
		
		// Add the main panel to the content pane
		
		add(mainpanel);
		
		setVisible(value);
		
	}
	
	private class ButtonListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			/*
				All the calculations are done in here 
				
			*
			*/
			
			try
			{
			
					NumberFormat formatter = new DecimalFormat("#0.000");
					NumberFormat formatter2 = new DecimalFormat("#0.000000");
					
					if(e.getSource() == convert)
					{
						String select = (String)jcombo.getSelectedItem();
						
						if(select.equals("°F"))
						{
							 number = Double.parseDouble(txtfield.getText());
						
							 cDegree =(5.0/9.0)*(number-32);	 
							 
							 JOptionPane.showMessageDialog(null, formatter.format(cDegree) + " °C\n");					
							 
							number = 0.0;
							
						}
						
						if(select.equals("°C"))
						{
							number = Double.parseDouble(txtfield.getText());
							
							fDegree = (9.0/5.0)*number+32;
							
						   JOptionPane.showMessageDialog(null, formatter.format(fDegree) + " °F\n");					
							 
							number = 0.0;
							
						}
							
																		
					}
					
					if(e.getSource() == back)
					{
						value = false;
						setVisible(value);
						new ConvertSelection();
					}
					
					if(e.getSource() == clear)
					{
						txtfield.setText("");
						
					}
					
					if(e.getSource() == exit)
					{
						JOptionPane.showMessageDialog(null, "Thank you for using the program");
						System.exit(0);
						
					}
				}
				catch(NumberFormatException nf)
				{
				}
		}
	}

}