/*******************************************************************************
 * Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
 * This file is part of Gluster Management Console.
 *
 * Gluster Management Console is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *  
 * Gluster Management Console is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License
 * for more details.
 *  
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.gluster.storage.management.console;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.equinox.app.IApplication;
import org.eclipse.equinox.app.IApplicationContext;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;

import com.gluster.storage.management.console.dialogs.LoginDialog;
import com.gluster.storage.management.core.model.Entity;

/**
 * This class controls all aspects of the application's execution
 */
public class Application implements IApplication {

	public static final String PLUGIN_ID = "com.gluster.storage.management.console";
	private static Application instance;
	private List<IEntityListener> entityListeners = Collections.synchronizedList(new ArrayList<IEntityListener>());
	private IStatusLineManager statusLineManager;

	public Application() {
		instance = this;
	}

	public static Application getApplication() {
		return instance;
	}

	public IStatusLineManager getStatusLineManager() {
		return statusLineManager;
	}

	public void setStatusLineManager(IStatusLineManager statusLineManager) {
		this.statusLineManager = statusLineManager;
	}

	private boolean login() {
		LoginDialog loginDialog = new LoginDialog(new Shell(Display.getDefault()));
		return (loginDialog.open() == Window.OK);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.equinox.app.IApplication#start(org.eclipse.equinox.app.IApplicationContext)
	 */
	public Object start(IApplicationContext context) {
		setSystemProperties();
		
		Display display = PlatformUI.createDisplay();

		final boolean[] loginSuccess = new boolean[1];
		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
			public void run() {
				loginSuccess[0] = login();
			}
		});

		if (!loginSuccess[0]) {
			return IApplication.EXIT_OK;
		}
		try {
			int returnCode = PlatformUI.createAndRunWorkbench(display, new ApplicationWorkbenchAdvisor());
			if (returnCode == PlatformUI.RETURN_RESTART) {
				return IApplication.EXIT_RESTART;
			}
			
			return IApplication.EXIT_OK;
		} finally {
			display.dispose();
		}
	}

	private void setSystemProperties() {
		// TODO: Trying this to avoid the webstart authentication dialog
		// to be tested, and removed if this doesn't work.
		System.setProperty("javaws.cfg.jauthenticator", "none");
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.equinox.app.IApplication#stop()
	 */
	public void stop() {
		if (!PlatformUI.isWorkbenchRunning())
			return;
		final IWorkbench workbench = PlatformUI.getWorkbench();
		final Display display = workbench.getDisplay();
		display.syncExec(new Runnable() {
			public void run() {
				if (!display.isDisposed())
					workbench.close();
			}
		});
	}

	public void addEntityListener(IEntityListener listener) {
		entityListeners.add(listener);
	}

	public void entityChanged(Entity entity, String[] paremeters) {
		for (IEntityListener listener : entityListeners) {
			listener.entityChanged(entity, paremeters);
		}
	}
}