import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;
import java.net.*;

/**
 * IP 4.1.1
 * @author emi-lind
 *
 */
public class ChatClient extends JFrame
{
	private String 			_host;
	private int 			_port;
	private Socket 			_socket;
	private BufferedReader 	_in;
	private PrintWriter 	_out;
	
	private JTextField _inputField;
	private JTextArea _outputArea;
	
	
	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		new ChatClient(args);
	}
	
	/**
	 * 
	 * @param aArgs The command line from main
	 */
	public ChatClient(String[] aArgs)
	{
		this.readCommandLineArgs(aArgs);
		this.createGUI();
		_socket = this.initConnection(_host, _port);
		// If connection established
		if (_socket != null)
		{
			String connectionInfo = "ChatClient. Host: " + _socket.getInetAddress() + " Port: " + _socket.getPort();
			this.setTitle(connectionInfo);
			try
			{
				this._in = new BufferedReader(new InputStreamReader(this._socket.getInputStream()));
				this._out = new PrintWriter(new OutputStreamWriter(this._socket.getOutputStream(), "ISO-8859-1"), true);
			}
			catch (IOException e)
			{
				System.err.println(e);
			}
			
			new ServerReader();
		}
		else
		{
			//No connection, quit the program
			System.exit(1);
		}
	}
	
	/**
	 * Reads the command line.
	 * @param aArgs The command-line to read
	 */
	private void readCommandLineArgs(String[] aArgs)
	{
		String host = "127.0.0.1";
		int port = 2000;
		switch (aArgs.length)
		{
		case 2:
			port = Integer.parseInt(aArgs[1]);
			// Fall-through
		case 1:
			host = aArgs[0];
			break;
		}
		_host = host;
		_port = port;
	}
	
	private void createGUI()
	{
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(550, 600);
		
		_inputField = new JTextField("");
		_outputArea = new JTextArea("");
		_outputArea.setEditable(false);
		_inputField.addActionListener(new ActionListener()
		{
			@Override
			public void actionPerformed(ActionEvent e)
			{
				String userInput = ChatClient.this._inputField.getText();
				ChatClient.this._out.println(userInput);
				ChatClient.this._inputField.setText("");
			}
		});
		Container c = this.getContentPane();
		c.add(_inputField, BorderLayout.SOUTH);
		JScrollPane outScroll = new JScrollPane(_outputArea);
		//Auto scroll
		outScroll.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener()
		{  
			public void adjustmentValueChanged(AdjustmentEvent e)
			{  
				e.getAdjustable().setValue(e.getAdjustable().getMaximum());  
			}
		});  
		c.add(outScroll, BorderLayout.CENTER);
		this.validate();
	}
	/**
	 * Creates a connection to a given host/ip and port.
	 * @param aHost The hosts address
	 * @param aPort The port
	 * @return A socket connected to given host. Null if no connection were made
	 */
	private Socket initConnection(String aHost, int aPort)
	{
		Socket toHost = null;
		try
		{
			toHost = new Socket(aHost, aPort);
		}
		catch(UnknownHostException e)
		{
			System.err.println(e);
		}
		catch (IOException e)
		{
			System.err.println(e);
		}
		
		return toHost;
	}
	
	private class ServerReader implements Runnable
	{
		public ServerReader()
		{
			Thread t = new Thread(this);
			t.start();
		}
		
		@Override
		public void run()
		{
			while (true)
			{
				try
				{
					String readed = ChatClient.this._in.readLine();
					ChatClient.this._outputArea.append(readed + "\n");
					
				}
				catch (IOException e)
				{
					System.err.print(e);
				}
				
			}
		}
	}
}