import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class LinkedList1Demo extends JFrame
{
	private LinkedList ll;
	private JTextArea listView;
	private JTextField cmdTextField;
	private JTextField resultTextField;
	
	public LinkedList1Demo()
	{
		ll = new LinkedList();
		listView = new JTextArea();
		cmdTextField = new JTextField();
		resultTextField = new JTextField();
		
		JPanel resultPanel = new JPanel(new GridLayout(1,2));
		resultPanel.add(new JLabel("Command Result"));
		resultPanel.add(resultTextField);
		resultTextField.setEditable(false);
		add(resultPanel, BorderLayout.NORTH);
		
		add(listView);
		listView.setEditable(false);
		listView.setBackground(Color.WHITE);
		
		JPanel cmdPanel = new JPanel(new GridLayout(1,2));
		cmdPanel.add(new JLabel("Command:"));
		cmdPanel.add(cmdTextField);
		add(cmdPanel, BorderLayout.SOUTH);
		cmdTextField.addActionListener(new LinkedList1Demo.CmdTextListener());
		
		setTitle("Linked List Demo");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		pack();
		setVisible(true);
	}// end of linkedlist1demo method
	
	private class CmdTextListener
				implements ActionListener
	{
		public void actionPerformed(ActionEvent evt)
		{
			String cmdText = cmdTextField.getText();
			Scanner sc = new Scanner(cmdText);
			String cmd = sc.next();
			
			if(cmd.equals("add"))
			{
				if(sc.hasNextInt())
				{
					int index = sc.nextInt();
					String element = sc.next();
					ll.add(index, element);
				}
				else
				{
					String element = sc.next();
					ll.add(element);
				}//end of second nested if statement
				listView.setText(ll.toString());
				pack();
				return;
			}//end of if statement
			
			if(cmd.equals("remove"))
			{
				if(sc.hasNextInt())
				{
					int index = sc.nextInt();
					String res = ll.remove(index);
					resultTextField.setText(res);
				}
				else
				{
					String element = sc.next();
					boolean res = ll.remove(element);
					String resText = String.valueOf(res);
					resultTextField.setText(resText);
				}//end of nested if statement
				
				listView.setText(ll.toString());
				pack();
				return;
			}//end of if statement
			
			if(cmd.equals("isempty"))
			{
				String resText = String.valueOf(ll.isEmpty());
				resultTextField.setText(resText);
				return;
			}//end of if statement
			
			if(cmd.equals("size"))
			{
				String resText  = String.valueOf(ll.size());
				resultTextField.setText(resText);
				return;
			}//end of if statement
			
			if(cmd.equals("sort"))
			{
				
			}// end of if statement
		}// end of actionperformed method
	}// end of cmdtextlistener class
	
	public static void main(String[] args)
	{
		new LinkedList1Demo();
	}//end of main method
}// end of linkedlist1demo