import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class display extends JPanel implements ActionListener
{
    protected static JTextField textField;
    protected JTextArea textArea;
    private final static String newline = "\n";
    String dir = System.getProperty("user.dir");
    static File file = new File("chat.html");
    static boolean exists = (file).exists();
    public static final String DATE_FORMAT_NOW = "HH:mm:ss";
    public static String now()
    {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
        return sdf.format(cal.getTime());
    }

    private static void createAndShowGUI() throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException
    {
        //Create and set up the window.
        JFrame.setDefaultLookAndFeelDecorated(true);
        UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
        JFrame frame = new JFrame("Chat");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add contents to the window.
        frame.add(new TestHelp());

        //TestHelp the window.
        frame.pack();
        frame.setVisible(true);
    }
    public void actionPerformed(ActionEvent event)
    {
        //the code it executes when the button is pressed
        boolean exists = (file).exists();
        byte[] c = new byte[1024];
        int count = 0;
        int readChars = 0;
        if(exists)
        {
            try
            {
                String input = textField.getText();
                if(input.length() != 0)
                {
                    InputStream is = new BufferedInputStream(new FileInputStream(file));
                    FileInputStream in = new FileInputStream("chat.html");
                    BufferedReader br = new BufferedReader(new InputStreamReader(in));
                    while ((readChars = is.read(c)) != -1)
                    {
                        for (int i = 0; i < readChars; ++i)
                        {
                            if (c[i] == '\n')
                                ++count;

                        }

                    }
                    String[] read;
                    read = new String[count];
                    for (int counter = 0; counter < read.length; counter++)
                    {
                        read[counter] = br.readLine();
                    }
                    in.close();
                    PrintWriter prnt = new PrintWriter(file);
                    for(int index=0;index<read.length; index++)
                    {
                        //Print the old file contents
                        prnt.println(read[index]);
                    }
                    prnt.println("<" +now() +">" +input);
                    prnt.close();
                }
            }
            catch(NullPointerException e)
            {
                e.printStackTrace();
            }
            catch(FileNotFoundException e)
            {
                e.printStackTrace();
            }
            catch(IOException e)
            {
                e.printStackTrace();
            }
        }
        else//if it does not exist
        {

        }
    }
    public static void main(String[] args) throws FileNotFoundException{
        //if(!exists){//if chat.html doesn't exists,
        //PrintWriter prnt = new PrintWriter(file);
        //prnt.println("");
        //prnt.close();
        //}
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                try
                {
                    createAndShowGUI();
                }
                catch (ClassNotFoundException e)
                {
                    e.printStackTrace();
                }
                catch (InstantiationException e)
                {
                    e.printStackTrace();
                }
                catch (IllegalAccessException e)
                {
                    e.printStackTrace();
                }
                catch (UnsupportedLookAndFeelException e)
                {
                    e.printStackTrace();
                }
            }
        });
        //else{}//if it exists, no use yet.
    }
    public display()
    {
        super(new GridBagLayout());

        textField = new JTextField(20);
        textField.addActionListener(this);

        textArea = new JTextArea(5, 20);
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea);

        //Add Components to this panel.
        GridBagConstraints c = new GridBagConstraints();
        c.gridwidth = GridBagConstraints.REMAINDER;
        c.fill = GridBagConstraints.HORIZONTAL;
        add(textField, c);

        c.fill = GridBagConstraints.BOTH;
        c.weightx = 1.0;
        c.weighty = 1.0;
        add(scrollPane, c);
    }
}