/* Author: Jeff Dalton <J.Dalton@ed.ac.uk>
 * Updated: Sun Dec  2 00:19:01 2001 by Jeff Dalton
 * Copyright: (c) 2001, AIAI, University of Edinburgh
 */

package ix.ichat;

import javax.swing.*;

import java.awt.Container;
import java.awt.Component;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.*;

import java.util.*;

import ix.icore.IXAgent;

import ix.iface.util.TranscriptTextArea;
import ix.iface.util.Reporting;
import ix.iface.util.ComboChoice;

import ix.util.*;
import ix.util.lisp.*;

/**
 * A frame for chat dialogues.
 */
public class ChatFrame extends JFrame implements ActionListener {

    protected Container contentPane = getContentPane();

    IXAgent agent;

    TranscriptPanel transcriptPanel = new TranscriptPanel();
    SendPanel sendPanel = new SendPanel();

    public ChatFrame(IXAgent agent, String title) {
	super(title);
	this.agent = agent;

	setJMenuBar(makeMenuBar());
	contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
	contentPane.add(transcriptPanel);
	contentPane.add(sendPanel);
	pack();
    }

    /**
     * Creates the menu bar
     */
    protected JMenuBar makeMenuBar() {
	JMenuBar bar = new JMenuBar();

	JMenu fileMenu = new JMenu("File");
	bar.add(fileMenu);
	if (agent instanceof IChat)
	    // Standalone I-Chat
	    fileMenu.add(makeMenuItem("Exit"));
	else
	    // Part of another agent
	    fileMenu.add(makeMenuItem("Close"));

	return bar;
    }

    // /\/: Must find a better way to do this rather than have
    // this method everywhere.
    protected JMenuItem makeMenuItem(String text) {
	JMenuItem item = new JMenuItem(text);
	item.addActionListener(this);
	return item;
    }

    /**
     * Action interpreter
     */
    public void actionPerformed(ActionEvent e) {
	String command = e.getActionCommand();
	Debug.noteln("ChatFrame action:", command);
	if (command.equals("Close")) {
	    setVisible(false);
	}
	else if (command.equals("Exit")) {
	    System.exit(0);
	}
	else
	    Debug.noteln("Nothing to do for", command);
    }

    public void newMessage(ChatMessage message) {
	transcriptPanel.newMessage(message);
	sendPanel.noteSender(message);
    }

    class TranscriptPanel extends JPanel {

	TranscriptTextArea transcript = new TranscriptTextArea(15, 40);

	TranscriptPanel() {
	    setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
	    setBorder(BorderFactory.createTitledBorder("Transcript"));
	    transcript.setEditable(false);
	    add(new JScrollPane(transcript));
	}

	public void newMessage(ChatMessage message) {
	    transcript.appendLine(message.getSenderId()
				  + " at " + Reporting.dateString()
				  + ":");
	    transcript.appendIndentedLines(3, message.getText());
	}

    }

    class SendPanel extends JPanel implements ActionListener {

	JTextArea sendText = new JTextArea(3, 40);

	ComboChoice destinationChoice = new ComboChoice();

	SendPanel() {
	    setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
	    setBorder(BorderFactory.createTitledBorder("Send"));

	    add(new JScrollPane(sendText));

	    JButton sendButton = new JButton("Send to");
	    sendButton.addActionListener(this);

	    JPanel sendControls = new JPanel();
	    sendControls.add(sendButton);
	    sendControls.add(destinationChoice);
	    add(sendControls);
	}

	public void actionPerformed(ActionEvent e) {
	    String command = e.getActionCommand();
	    Debug.noteln("I-Chat send action:", command);
	    if (command.equals("Send to")) {
		sendTo(destinationChoice.getSelectedString());
	    }
	    else
		Debug.noteln("Nothing to do for", command);
	}

	void sendTo(String destination) {
	    Debug.noteln("Sending chat message to", destination);
	    String text = sendText.getText();
	    String sender = (String)agent.getAgentIPCName();
	    ChatMessage message = new ChatMessage(text, sender);
	    try {
		IPC.sendObject(destination, message);
		ChatFrame.this.transcriptPanel.newMessage(message);
		sendText.setText("");
	    }
	    catch (Exception e) {
		Debug.noteln("Exception while sending to", destination);
		Debug.noteException(e);
		JOptionPane.showMessageDialog(ChatFrame.this,
		    new Object[] {"Problem sending chat message",
				  e.getMessage()},
			"Problem sending chat message",
			JOptionPane.ERROR_MESSAGE);
	    }
	}

	void noteSender(ChatMessage message) {
	    // This method lets us remember anyone who sent to us.
	    String sender = message.getSenderId();
	    if (!destinationChoice.hasItem(sender)) {
		Debug.noteln("New chat participant", sender);
		destinationChoice.addItem(sender);
	    }
	}

    }

}