import java.awt.Component;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class DVRouter extends Hub implements Runnable {
	Hashtable<String, DVInfo> table = new Hashtable<String, DVInfo>();
	Thread thread;
	JTextArea tableArea;
	JButton autoButton;

	/***************************************************************************
	 * create all components (buttons, sliders, views, etc and arrange them
	 */
	public Component createComponents() {
		JPanel basePane = new JPanel();
		basePane.setLayout(new BoxLayout(basePane, BoxLayout.Y_AXIS));

		receivedField = new JTextField(10);
		basePane.add(receivedField);
		
		JButton sendButton = new JButton("Send");
		sendButton.addActionListener(this);
		
		autoButton = new JButton("Start");
		autoButton.addActionListener(this);

		JPanel buttonPane = new JPanel();
		buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.X_AXIS));
		buttonPane.add(sendButton);
		buttonPane.add(autoButton);
		basePane.add(buttonPane);

		basePane.add(createLights());

		tableArea = new JTextArea(10, 8);
		basePane.add(tableArea);

		return basePane;
	}

	public void start() {
		System.out.println("Start in class DVRouter");
		goOn = false;
		thread = new Thread(this);
		//thread.start();
	}

	public void sendInfo() {
		System.out.println(node.getName() + " sends messages");
		// hole List mit allen angeschlossenen Knoten
		Vector successors = node.getSuccessors();
		String text = node.getName() + ":*:" + buildMessage();
		for (int i = 0; i < successors.size(); i++) {
			// Link zu dem nächsten Knoten
			Link l = (Link) successors.elementAt(i);
			// Knoten zu diesem Link
			Node to = l.getNode();
			// Nachricht schicken
			showNodes.sendMessage(node, to, text);
			// Sende Indikator einschalten
			sendLabel.setIcon(playImageIcon);
		}	
		
		// Falls keine Verbindungen vorhanden sind, 
		// Anzeige und dabei Lebenszähler aktualisieren
		if( successors.size() == 0 ) {
			aktualisiereTabellenAnzeige();
		}
	}
	
	public void run() {
		System.out.println("Run in class DVRouter");
		while (goOn) {
			sendInfo();
			Sleep.sleep(5000, 12000);
		}
	}

	public void receiveMessage(Node sendNode, String text) {
		receivedField.setText(sendNode.getName() + "-> " + text);
		receiveLabel.setIcon(playImageIcon);
		triggerLabel(receiveLabel);

		String parts[] = text.split(":", 3);
		String sender = parts[0];
		String empfaenger = parts[1];

		table.put(sender, new DVInfo(sendNode.getName(), 1));

		if (parts[2].indexOf(";") > 0) {
			// Zerlege Nachricht in Tabellen-Einträge
			String[] infos = parts[2].split(";");
			for (String info : infos) {
				// Zerlege Tabellen-Eintrag
				String[] ip = info.split("\\+");
				String dest = ip[0];
				// Ich selbst?
				if (dest.equals(node.getName()))
					continue;
				int dist = Integer.parseInt(ip[1]);
				if (table.containsKey(dest)) {
					// Falls Eintrag schon vorhanden, nur
					// kleinerer Distanz überschreiben 
					DVInfo i2 = table.get(dest);
					if (dist < i2.getDistance()) {
						table.put(dest, new DVInfo(sender, dist + 1));
					}
				} else {
					table.put(dest, new DVInfo(sender, dist + 1));
					
				}
			}
		}

		aktualisiereTabellenAnzeige();
	}

	private void aktualisiereTabellenAnzeige() {
		// Nun Anzeige aktualisieren
		tableArea.setText("");
		Enumeration<String> keys = table.keys();
		ArrayList<String> oldies = new ArrayList<String>(); 
		while (keys.hasMoreElements()) {
			String k = keys.nextElement();
			DVInfo info = table.get(k);
			String t = k + ": " + info.getNextHop() + " ";
			t += info.getLiveCounter() + " ";
			for( int i=0; i<info.getDistance(); i++) 
				t+= "#";
			tableArea.append(t + "\n");
			info.decLiveCounter();
			// falls Lebenszeit abgelaufen, zum Löschen vormerken
			if( info.getLiveCounter() <= 0 ) {
				oldies.add(k);
			}
		}
		for( String k : oldies ) table.remove(k);		
	}

	/**
	 * @return
	 * Baut aus den Tabelleneinträgen einen Text 
	 * im Format Ziel1+dist1;Ziel2+dist2;  ... 
	 * auf. 
	 */
	public String buildMessage() {
		String text = "";
		Enumeration<String> keys = table.keys();
		while (keys.hasMoreElements()) {
			String k = keys.nextElement();
			DVInfo info = table.get(k);
			text += k + "+" + info.getDistance() + ";";
		}
		return text;
	}
	
	public void actionPerformed(ActionEvent event) {
		String eventText = event.getActionCommand();
		System.out.println("Event: " + event + " " + eventText);

		if (eventText.equals("Send")) {
			sendInfo();
		} else 	if (eventText.equals("Start")) {
			goOn = true;
			autoButton.setText( "Stop");
			thread.start();
		} else 	if (eventText.equals("Stop")) {
			goOn = false;
			autoButton.setText( "Start");
		}

	}
}