src/main/java/de/unixwork/im/App.java

package de.unixwork.im;

import javax.swing.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jivesoftware.smack.roster.RosterEntry;
import org.jxmpp.jid.Jid;

public class App {
    
    private static App instance;
    
    private final ContactListFrame contactListFrame;
    private final Map<String, ConversationFrame> conversations;

    private final Xmpp xmpp;
    
    public App(Xmpp xmpp) throws Exception {
        if(instance != null) {
            throw new Exception("App already initilized");
        }
        App.instance = this;
        conversations = new HashMap<>();
        this.xmpp = xmpp;

        // Create the contact list window
        contactListFrame = new ContactListFrame();
        contactListFrame.setContactClickListener(contact -> {
            openConversation(contact.getJid().asUnescapedString());
        });
        contactListFrame.setVisible(true);
    }
    
    public static App getInstance() {
        return instance;
    }
    
    public Xmpp getXmpp() {
        return xmpp;
    }

    // Method to open a conversation window
    public void openConversation(String xid) {
        SwingUtilities.invokeLater(() -> {
            if (!conversations.containsKey(xid)) {
                ConversationFrame conversationFrame = new ConversationFrame(xid);
                conversations.put(xid, conversationFrame);
                conversationFrame.setVisible(true);
            } else {
                conversations.get(xid).toFront();
            }
        });
    }
    
    public void dispatchMessage(Jid from, String msg, boolean secure) {
        SwingUtilities.invokeLater(() -> {
            // add message to the correct conversation
            // if no conversation exists yet, create a new window
            String xid = from.asBareJid().toString();
            //String resource = from.getResourceOrNull();
            ConversationFrame conversation = conversations.get(xid);
            if(conversation == null) {
                conversation = new ConversationFrame(xid);
                conversations.put(xid, conversation);
            }
            
            conversation.addToLog(msg, true, false);
            
            conversation.setVisible(true);
        });
    }
    
    public void setContacts(List<RosterEntry> contacts) {
        SwingUtilities.invokeLater(() -> {
            contactListFrame.setContacts(contacts);
        });
    }

    // Method to perform actions in the GUI thread from other threads
    public void runOnUiThread(Runnable action) {
        SwingUtilities.invokeLater(action);
    }
}