/*
 * 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.ui_swing;

import com.dmdirc.addons.ui_swing.events.SwingWindowEvent;
import com.dmdirc.events.eventbus.EventBus;

import java.awt.Window;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Singleton;

import net.engio.mbassy.listener.Handler;

/**
 * Manages all swing windows.
 */
@Singleton
public class SwingWindowManager {

    /** Top level window list. */
    private final List<Window> windows;

    @Inject
    public SwingWindowManager(final EventBus eventBus) {
        windows = new ArrayList<>();
        eventBus.subscribe(this);
    }

    @Handler
    public void handleWindowEvent(final SwingWindowEvent event) {
        if (event.getEvent().getSource() instanceof Window) {
            if (event.getEvent().getID() == WindowEvent.WINDOW_OPENED) {
                addTopLevelWindow((Window) event.getEvent().getSource());
            } else if (event.getEvent().getID() == WindowEvent.WINDOW_CLOSED) {
                delTopLevelWindow((Window) event.getEvent().getSource());
            }
        }
    }

    /**
     * Adds a top level window to the window list.
     *
     * @param source New window
     */
    private void addTopLevelWindow(final Window source) {
        synchronized (windows) {
            windows.add(source);
        }
    }

    /**
     * Deletes a top level window to the window list.
     *
     * @param source Old window
     */
    private void delTopLevelWindow(final Window source) {
        synchronized (windows) {
            windows.remove(source);
        }
    }

    /**
     * Returns a list of top level windows.
     *
     * @return Top level window list
     */
    public List<Window> getTopLevelWindows() {
        synchronized (windows) {
            return new ArrayList<>(windows);
        }
    }

}