import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

import java.io.*;
import java.net.*;

public class JClient extends JFrame implements ActionListener {

    public static final String NL = System.getProperty( "line.separator" );
    public static final int DEFAULT_PORT = 80;

    private JTextField host = new JTextField();
    private JTextArea input = new JTextArea( 20, 100 );
    private JTextArea console = new JTextArea( 20, 100 );
    private JButton submit = new JButton( "Submit" );

    private JClient() {

	// Controllers

	setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
	submit.addActionListener( this );

	// Presentation

	setTitle( "JClient" );

	host.setText( "www.site.uottawa.ca" );
 
	input.setBorder( BorderFactory.createLineBorder( Color.black ) );
	input.setFont( new Font( "Monospaced", Font.BOLD, 12 ) );
	input.setBackground( Color.white );

	console.setEditable( false );
	console.setFont( new Font( "Monospaced", Font.BOLD, 12 ) );
	console.setBackground( Color.white );
	console.setForeground( Color.red );
	log( "Info: Enter the HOST name at the top, an HTTP request in the second box, then click submit." );

	JPanel center = new JPanel();
	center.setLayout( new GridLayout( 2, 1 ) );
	center.add( new JScrollPane( input ) );
	center.add( new JScrollPane( console ) );

	Container content = getContentPane();
	content.add( submit, BorderLayout.SOUTH );
	content.add( host, BorderLayout.NORTH );
	content.add( center, BorderLayout.CENTER );

	pack();
    }

    private void log( String msg ) {
	console.append( msg + NL );
    }

    public void actionPerformed( ActionEvent e ) {

	if ( e.getSource() == submit ) {
	    submit();
	}

    }

    public void submit() {

        Socket socket = null;
        PrintWriter out = null;
	BufferedReader in = null;

	String name = host.getText();
	boolean okay = false;

	log( "Info: Connecting to host: " + name );

	try {
            socket = new Socket( name, DEFAULT_PORT );
            out = new PrintWriter( socket.getOutputStream(), true );
	    in = new BufferedReader(new InputStreamReader( socket.getInputStream() ) );
	    okay = true;
        } catch ( UnknownHostException e ) {
	    log( "Info: Unknown host: " + name );
        } catch ( IOException e ) {
            log( "Info: Couldn't get I/O for the connection to: " + name );
        }

	if ( ! okay ) {
	    try { 
		if ( in != null ) { in.close(); }
		if ( out != null ) { out.close(); }
		if ( socket != null ) { socket.close(); }
	    } catch ( IOException e ) {
		log( "Info: Caught IOException" );
	    }

	} else {

	    String fromServer;
	    String fromUser;

	    String[] lines = input.getText().split( NL );

	    for ( String line : lines ) {
		out.println( line );
	    }

	    out.println( ); 
	    
	    try {
		while ( (fromServer = in.readLine() ) != null) {
		    log( "Server: " + fromServer );
		}
	    } catch ( IOException e ) {
		log( "Info: Caught IOException" );
	    }

	    try { 
		if ( in != null ) { in.close(); }
		if ( out != null ) { out.close(); }
		if ( socket != null ) { socket.close(); }
	    } catch ( IOException e ) {
		log( "Info: Caught IOException" );
	    }

	    log( "Info: Connection closed" );

	}

    }

    public static void main( String[] args ) {
	JFrame app = new JClient();
	app.setVisible( true );
    }

}