import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;

import java.awt.BorderLayout;

import java.awt.event.KeyEvent;

import org.jdom.DocType;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Attribute;
import org.jdom.input.SAXBuilder;

import java.io.File;

import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.Iterator;

/**
 * Grafiskt användargränssnitt och några xtra finesser i form av snabbmeddelanden.
 * För snabbmeddelanden testa att trycka F1 - F3, snabmeddelanden kan 
 * definieras/editeras i filen quickmessages.xml
 * 
 * @author Henrik Johansson
 */
public class XMLChatClientGUI extends JFrame {
	private XMLChatClient xmlChatClient;
	private Map<Integer, String> qMessages;
	private boolean qMessagesLoaded = false;
	
	private javax.swing.JPanel jContentPane = null;

	private JPanel jPanel = null;
	private JTextField messageField = null;
	private JButton sendButton = null;
	private JScrollPane jScrollPane = null;
	private JTextArea messagesTextArea = null;
	/**
	 * konstruktor
	 * 
	 * @param xmlChatClient
	 *            chatklienten som söter logiken.
	 */
	public XMLChatClientGUI(XMLChatClient xmlChatClient) {
		super();
		this.xmlChatClient = xmlChatClient;
		initialize();
	}
	
	/**
	 * Skickar meddelande från meddelandefältet (<code>messageField</code>)
	 * vidare till chatklienten (<code>xmlChatClient</code>) som i sin tur
	 * skickar detta vidare till chat-servern.
	 */
	private void sendMessage() {
		xmlChatClient.send(getMessageField().getText());
		getMessageField().setText("");
	}
	
	/**
	 * skickar snabbmeddelande till chatklienten (<code>xmlChatClient</code>).
	 * Om snabbmeddelanden ännu inte laddats försöker funktionen ladda dessa
	 * från filen quickmessages.xml som skall peka på dtd:n quickmessages.dtd.
	 * 
	 * @param key
	 */
	private void sendQuickMessage(int key) {
		if(! qMessagesLoaded) {
			qMessagesLoaded = true;
			qMessages = new HashMap<Integer, String>();
			File file = new File("quickmessages.xml");
			if(file.exists()) {
				try {
					SAXBuilder builder = new SAXBuilder(true);
					Document document = builder.build(file);
					List messages = document.getRootElement().getChildren("message");
					Iterator children = messages.iterator();
					while(children.hasNext()) {
						Element message = (Element) children.next();
						int fn = Integer.parseInt(message.getAttribute("functionkey").getValue().substring(1)) + KeyEvent.VK_F1 - 1;
						qMessages.put(fn, message.getText());
					}
				} catch(Exception e) {
					this.addMessage("ERROR: Misslyckades med att ladda snabbmeddelanden");
					System.err.println("ERROR: Misslyckades med att ladda snabbmeddelanden");
					e.printStackTrace();
				}
			}
		}
		String msg = qMessages.get(key);
		if(msg != null) {
			xmlChatClient.send(msg);
		}
	}
	
	/**
	 * Lägger till ett meddelande till visningsutrymmet (
	 * <code>messagesTextArea</code>).
	 * 
	 * @param message
	 */
	public void addMessage(String message) {
		getMessagesTextArea().append('\n' + message);
	}
	
	/**
	 * Denna metod initierar this
	 *  
	 */
	private void initialize() {
		this.setSize(300,200);
		this.setContentPane(getJContentPane());
		this.setTitle("XMLChatClient");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	/**
	 * Denna metod initierar jContentPane
	 * 
	 * @return javax.swing.JPanel
	 */
	private javax.swing.JPanel getJContentPane() {
		if(jContentPane == null) {
			jContentPane = new javax.swing.JPanel();
			jContentPane.setLayout(new java.awt.BorderLayout());
			jContentPane.add(getJPanel(), java.awt.BorderLayout.NORTH);
			jContentPane.add(getJScrollPane(), java.awt.BorderLayout.CENTER);
		}
		return jContentPane;
	}
	/**
	 * Denna metod initierar jPanel
	 * 
	 * @return javax.swing.JPanel
	 */    
	private JPanel getJPanel() {
		if (jPanel == null) {
			jPanel = new JPanel();
			jPanel.setLayout(new BorderLayout());
			jPanel.add(getMessageField(), java.awt.BorderLayout.CENTER);
			jPanel.add(getSendButton(), java.awt.BorderLayout.EAST);
		}
		return jPanel;
	}
	/**
	 * Denna metod initierar messageField
	 * 
	 * @return javax.swing.JTextField
	 */    
	private JTextField getMessageField() {
		if (messageField == null) {
			messageField = new JTextField();
			messageField.addKeyListener(new java.awt.event.KeyAdapter() { 
				public void keyPressed(KeyEvent e) {
					if(e.getKeyCode() >= KeyEvent.VK_F1 && e.getKeyCode() <= KeyEvent.VK_F24) {
						sendQuickMessage(e.getKeyCode());
					}
				}
			});
			messageField.addActionListener(new java.awt.event.ActionListener() { 
				public void actionPerformed(java.awt.event.ActionEvent e) {    
					sendMessage();
				}
			});
		}
		return messageField;
	}
	/**
	 * Denna metod initierar sendButton
	 * 
	 * @return javax.swing.JButton
	 */    
	private JButton getSendButton() {
		if (sendButton == null) {
			sendButton = new JButton();
			sendButton.setText("send");
			sendButton.addActionListener(new java.awt.event.ActionListener() { 
				public void actionPerformed(java.awt.event.ActionEvent e) {    
					sendMessage();
				}
			});
		}
		return sendButton;
	}
	/**
	 * Denna metod initierar jScrollPane
	 * 
	 * @return javax.swing.JScrollPane
	 */    
	private JScrollPane getJScrollPane() {
		if (jScrollPane == null) {
			jScrollPane = new JScrollPane();
			jScrollPane.setViewportView(getMessagesTextArea());
		}
		return jScrollPane;
	}
	/**
	 * Denna metod initierar messagesTextArea
	 * 
	 * @return javax.swing.JTextArea
	 */    
	private JTextArea getMessagesTextArea() {
		if (messagesTextArea == null) {
			messagesTextArea = new JTextArea();
		}
		return messagesTextArea;
	}
}