/*
Class Chat
By Martin Carlsson
Internetprogrammering 4 course
*/

import org.jdom.output.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
import org.jdom.*;
import javax.swing.text.*;

/**Class Chat is both a GUI and Listener class for the XML-based Chat Client Application.*/
public class Chat extends JFrame implements ActionListener {
	
	private String host;	
    private int port; 
	private Socket socket;
	private Thread receiveActivity;
	private static String usage = "usage: <java Chat host> <port>\n"+
    "example:java Chat this.is.the.host.adress 7000";
	private JTextField nameInputField = new JTextField();
    private JTextField emailInputField = new JTextField();
    private JTextField homepageInputField = new JTextField();    
    private JLabel nameLabel, emailLabel, homepageLabel, personalLabel1, personalLabel2, messageLabel;    
	private JTextArea messageInputArea=new JTextArea();// area to write messages in
    private JScrollPane messageInputAreaPane=new JScrollPane(messageInputArea);// scroll area for the input area
	private JTextArea messageArea=new JTextArea(); // message area
	private JScrollPane messageAreaPane=new JScrollPane(messageArea); // scroll area for the message area
	private JPanel north=new JPanel(),south=new JPanel(); // north and south panels
    private JPanel southEast=new JPanel(),southWest=new JPanel(); // south east and south west panels
    private JButton sendButton=new JButton(), quitButton=new JButton(); // send and quit buttons
	private Receiver receiver; 
	private Sender sender; 
    private org.jdom.Document doc;    
	
	/**
    *Constructs a Chat object/instance
    *@param host host to connect to
    *@param port port used for the connection
    */
	public Chat(String host, int port)throws IOException {
		
		this.host=host;
		this.port=port;
        
		Container con=getContentPane();
		
		north.setLayout(new FlowLayout(FlowLayout.RIGHT));
		north.setBackground(Color.blue);
		north.add(quitButton);
		
		south.setLayout(new BorderLayout());
		south.setBackground(Color.blue);
        personalLabel1 = new JLabel(" Personal information");
        personalLabel2 = new JLabel("");
        personalLabel1.setForeground(Color.white);
        personalLabel2.setForeground(Color.white);
        
        nameLabel = new JLabel("  Name");
        emailLabel = new JLabel("  Email");
        homepageLabel = new JLabel("  Homepage");
        nameLabel.setForeground(Color.yellow);
        emailLabel.setForeground(Color.yellow);
        homepageLabel.setForeground(Color.yellow);

        southWest.setLayout(new GridLayout(4,2));
        southWest.setPreferredSize(new Dimension(280,130));
        southWest.setBackground(Color.blue);
        southWest.setForeground(Color.white);
        southWest.add(personalLabel1);
        southWest.add(personalLabel2);
        
        southWest.add(nameLabel);
        southWest.add(nameInputField);
        
        southWest.add(emailLabel);
        southWest.add(emailInputField);
        
        southWest.add(homepageLabel);
        southWest.add(homepageInputField);
     
        JPanel southEastUp = new JPanel();
        southEastUp.setBackground(Color.blue);
        southEastUp.setLayout(new FlowLayout(FlowLayout.LEFT));
        southEastUp.setForeground(Color.white);

        messageLabel = new JLabel("Message");
        messageLabel.setForeground(Color.white);
        southEastUp.add(messageLabel);
        JPanel southEastDown = new JPanel();
        
        southEastDown.setBackground(Color.blue);
        southEastDown.setForeground(Color.white);
        southEastDown.setLayout(new FlowLayout(FlowLayout.RIGHT));
        southEastDown.add(sendButton);
		southEast.setLayout(new BorderLayout());
        southEast.setPreferredSize(new Dimension(270,130));
        
        // Message input area settings
		messageInputArea.setToolTipText("Type your messages"); 
        messageInputArea.setLineWrap(true);
        messageInputArea.setBorder(BorderFactory.createEmptyBorder(4,4,4,4));//Onsynlig border runt meddelandeytan
        messageInputArea.setEditable(true);
		messageInputArea.requestFocus();
        messageInputAreaPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
        messageInputAreaPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);   
        
        //Keeps the scrollbar for the input area to the bottom
        DefaultCaret inputCaret = (DefaultCaret) messageInputArea.getCaret(); 
        inputCaret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);  
        messageInputAreaPane.setPreferredSize(new Dimension(240,50));
        
        southEast.setBackground(Color.blue);
        southEast.setForeground(Color.white);
        southEast.add(southEastUp, BorderLayout.NORTH);
        southEast.add(messageInputAreaPane,BorderLayout.CENTER);
        southEast.add(southEastDown,BorderLayout.SOUTH);
        south.add(southWest, BorderLayout.WEST);
        south.add(southEast,BorderLayout.EAST);
       
		// Message area settings
		messageArea.setToolTipText("Incoming messages"); 
        messageArea.setLineWrap(true);
        messageArea.setBorder(BorderFactory.createEmptyBorder(4,4,4,4));//Onsynlig border runt meddelandeytan
        messageArea.setEditable(false);
		messageInputArea.requestFocus();
        
        //Scroll area for the message area
        messageAreaPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
        messageAreaPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);   
        //Keeps the scrollbars for the message area to the bottom
        DefaultCaret caret = (DefaultCaret) messageArea.getCaret(); 
        caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);  
		
		// button text
		sendButton.setText("SEND");
		quitButton.setText("QUIT");
		
		
		//Adds listeners for the quit and send buttons
        sendButton.addActionListener(this);
		quitButton.addActionListener(this);
		
		addWindowListener(new ExitListener());

		
		// Adds panels and message area
		con.add(south,BorderLayout.SOUTH);
		con.add(north,BorderLayout.NORTH);
		con.add(messageAreaPane,BorderLayout.CENTER);
		
		setSize(600,400);
        setResizable(false); 
		show();
		
		// Tries to create a socket
		try {
			socket =new Socket(host, port);
		}
		catch(UnknownHostException uHe) {
			messageArea.setText("Unable to connect to "+ host + " on " + port +".....closing");
			System.err.println("Unable to connect to "+ host + " on " + port +".....closing");
			setTitle("Java Chat Client");
		}
		catch (IOException iE) {
			messageArea.setText("Unable to connect to "+ host + " on port " + port + ". Check your Internet connection and make sure port " + port + " is open\n.");
			System.err.println("Unable to connect to "+ host + " on " + port+".");
		}
		sender=new Sender(socket, this); // creates a Sender instance
		receiver=new Receiver(this, socket); // creates a Receiverinstance
		receiveActivity= new Thread(receiver); 
		receiveActivity.start(); // starts the receive thread
    } // end of constructor
	
    /** 
    *Empties the input area
    */
	public void clearInputArea() {
		
        messageInputArea.setText("");
	}
	
	/** 
    *Error message for in the message area
    */
	public void setErrorMessage(String error) {
		
		messageArea.append("\n" + error + "\n");
	}
	
	/**
    *Sets the incoming message, and shows the xml document in the command prompt
    */
	public void setMessage(org.jdom.Document doc) {
        
        messageArea.append(doc.getRootElement().getChild("header").getChild("id").getChild("name").getText());
        messageArea.append("(" + doc.getRootElement().getChild("header").getChild("id").getChild("email").getText() +") > ");
        messageArea.append(doc.getRootElement().getChild("body").getText()+"\n");
       
        //Format for pretty printout in the command prompt
        Format prettyFormat = Format.getPrettyFormat();
        prettyFormat.setExpandEmptyElements(true);
        XMLOutputter prettyXmlOut = new XMLOutputter(prettyFormat);
        try {
            System.out.println("*****Inkomming message:");            
            prettyXmlOut.output(doc, System.out);
        }
        catch(Exception e) {
        }
    }
    
    /** 
    *Listens to closing events
    */
    class ExitListener extends WindowAdapter {
        public void windowClosing(WindowEvent event) {
            quit();
        }
    };
    
    
    /** 
    *Shuts down
    */
    void quit() {
        String err = "\n Please wait...having some trouble closing..";
        try {
                sender.closeOutStream();
                receiver.setLooping(false);
                receiver.closeInStream();
			    if(socket!=null) 
					socket.close();
			}
            catch(SocketException sE) {
                messageArea.append(err);
                System.err.println(sE);
            }
            catch(IOException iE) {
				messageArea.append(err);
                System.err.println(iE);
			}
			catch(NullPointerException nE) {
				messageArea.append(err);
                System.err.println(nE);
			}
        System.out.println("\nBye, Bye...");
		System.exit(0);	
        
    }
    
   	/**
    *Listens to when the user presses a button.
    */	
	public void actionPerformed(ActionEvent ae) {
        
		if(ae.getSource()==sendButton) {
			try {
				sender.sendAway(nameInputField.getText().trim(), emailInputField.getText().trim(), homepageInputField.getText().trim(),messageInputArea.getText().trim());
				clearInputArea();
			}
			catch(Exception e) {
				messageArea.append("\n Not able to send any messages at this time");
            }
		}
		else if(ae.getSource() == quitButton) {
			quit();
		}
    } 

    public String getHost() {
        
        return host;
    }
    
    public int getPort() {
        
        return port;
    }

	
	/** 
    *Main
    */
	public static void main (String[] args) {
		
		int port=2000; // default port
		String host="localhost"; // default host
		String portText = "port must be a number between"+
					"0 and 65535";
		System.out.println("Welcome to Chat\n" + usage + "\n");  
		
		try {
			//if 2 or more arguments
			if(args.length>=2) {
				host=args[0];
				port =Integer.parseInt(args[1]);
			}
			//any host argument?
			else if(args.length==1) {
				host=args[0];
			}
			// Is the port in the valid port range?
			if(port > 65535 || port < 0)
				System.err.println(portText);
			else
				new Chat(host, port); // starts
		}
		catch(NumberFormatException nFe) {
			System.err.println(portText);
		}
		catch(Exception e){
			System.err.println(usage + "\n\n" + e.getMessage());  
		}		
    }
}//End class Chat