// <applet code="TempApplet" width="250" height="200"></applet>

import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

import java.net.InetAddress;
import java.net.Socket;

import java.util.HashMap;
import java.util.StringTokenizer;
import java.util.Iterator;

public final class TempApplet extends JApplet implements ActionListener {
    private static final int PORT = 3003;
    private JLabel etikett = new JLabel("De senaste temperaturerna:");
    private JTextArea tempfönster = new JTextArea(8, 20);
    private JButton knapp = new JButton("Rensa");

    public void init() {
	try {
	    Container cp = getContentPane();
	    cp.setLayout(new FlowLayout());
	    cp.add(etikett);
	    cp.add(tempfönster);
	    cp.add(knapp);
	    knapp.addActionListener(this);
	    InetAddress addr = InetAddress.getByName("localhost");
	    Socket socket = new Socket(addr, PORT);
	    BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
	    ServerListener t = new ServerListener(in, tempfönster);
	    t.start();
	}
	catch (IOException e) {
	    tempfönster.append("Det har upppstått ett fel.");
	}
    }

    public void actionPerformed(ActionEvent e) {
	tempfönster.setText("");
    }

    public static void main(String[] args) {
        TempApplet applet = new TempApplet();
        JFrame frame = new JFrame("TempApplet");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(250, 200);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }
} // class TempApplet

final class ServerListener extends Thread {
    private final BufferedReader fromServer;
    private final JTextArea utfönster;
    private final HashMap tabellen;

    public ServerListener(BufferedReader fromServer, JTextArea utfönster) {
	this.fromServer = fromServer;
	this.utfönster = utfönster;
	this.tabellen = new HashMap();
    }

    private class SetText implements Runnable {
	private String text;
	public SetText(String text) {
	    this.text = text;
	}
	public void run() {
	    utfönster.setText(text);
	}
    }

    private class AppendText implements Runnable {
	private String text;
	public AppendText(String text) {
	    this.text = text;
	}
	public void run() {
	    utfönster.append(text);
	}
    }

    public void run() {
	String lineFromServer;	
	try {
	    while ((lineFromServer = fromServer.readLine()) != null) {
		// Warning: This fails for location names that contain spaces.
		StringTokenizer tokenizer = new StringTokenizer(lineFromServer, " ");
		String ort = tokenizer.nextToken();
		String temperatur = tokenizer.nextToken();
		tabellen.put(ort, temperatur);
		SwingUtilities.invokeLater(new SetText(""));
		for (Iterator i = tabellen.keySet().iterator(); i.hasNext(); ) {
                    String o = (String)i.next();
		    SwingUtilities.invokeLater(new AppendText(o + " " + tabellen.get(o) + "\n"));
                }
	    }
	    SwingUtilities.invokeLater(new AppendText("Servern har kopplat ner.\n"));
	}
	catch (IOException e) {
	    SwingUtilities.invokeLater(new AppendText("Det har upppstått ett fel."));
	}
    }
} // class ServerListener