/*
 * Copyright (c) 2006-2017 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
 * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.dmdirc.addons.contactlist;

import com.dmdirc.events.ChannelUserAwayEvent;
import com.dmdirc.events.ChannelUserBackEvent;
import com.dmdirc.events.FrameClosingEvent;
import com.dmdirc.events.NickListClientAddedEvent;
import com.dmdirc.events.NickListClientsChangedEvent;
import com.dmdirc.events.eventbus.EventBus;
import com.dmdirc.interfaces.GroupChat;
import com.dmdirc.interfaces.GroupChatUser;
import com.dmdirc.interfaces.PrivateChat;

import net.engio.mbassy.listener.Handler;

/**
 * Listens for contact list related events.
 */
public class ContactListListener {

    /** The group chat this listener is for. */
    private final GroupChat groupChat;
    /** Event bus to register listeners with. */
    private final EventBus eventBus;

    /**
     * Creates a new ContactListListener for the specified group chat.
     *
     * @param groupChat The group chat to show a contact list for
     */
    public ContactListListener(final GroupChat groupChat, final EventBus eventBus) {
        this.groupChat = groupChat;
        this.eventBus = eventBus;
    }

    /**
     * Adds all necessary listeners for this contact list listener to function.
     */
    public void addListeners() {
        eventBus.subscribe(this);
    }

    /**
     * Removes the listeners added by {@link #addListeners()}.
     */
    public void removeListeners() {
        eventBus.unsubscribe(this);
    }

    @Handler
    public void handleClientsUpdated(final NickListClientsChangedEvent event) {
        if (event.getChannel().equals(groupChat)) {
            event.getUsers().forEach(this::clientAdded);
        }
    }

    @Handler
    public void handleClientAdded(final NickListClientAddedEvent event) {
        if (event.getChannel().equals(groupChat)) {
            clientAdded(event.getUser());
        }
    }

    @Handler
    public void handleUserAway(final ChannelUserAwayEvent event) {
        if (event.getChannel().equals(groupChat)) {
            clientAdded(event.getUser());
        }
    }

    @Handler
    public void handleUserBack(final ChannelUserBackEvent event) {
        if (event.getChannel().equals(groupChat)) {
            clientAdded(event.getUser());
        }
    }

    @Handler
    public void windowClosing(final FrameClosingEvent event) {
        if (event.getSource().equals(groupChat.getWindowModel())) {
            removeListeners();
        }
    }

    void clientAdded(final GroupChatUser client) {
        final PrivateChat query =
            groupChat.getConnection().get().getQuery(client.getNickname(), false);
        query.getWindowModel()
            .setIcon("query-" + client.getUser().getAwayState().name().toLowerCase());
    }

}