/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.actions;

import java.util.Iterator;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.dltk.ui.IContextMenuConstants;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.actions.ActionGroup;
import org.eclipse.ui.actions.CloseResourceAction;
import org.eclipse.ui.actions.CloseUnrelatedProjectsAction;
import org.eclipse.ui.ide.IDEActionFactory;

/**
 * Adds actions to open and close a project to the global menu bar.
 *
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 *
 *
 */
public class ProjectActionGroup extends ActionGroup {

	private IWorkbenchSite fSite;

	private OpenProjectAction fOpenAction;
	private CloseResourceAction fCloseAction;
	private CloseResourceAction fCloseUnrelatedAction;

	/**
	 * Creates a new <code>ProjectActionGroup</code>. The group requires that
	 * the selection provided by the site's selection provider is of type <code>
	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
	 *
	 * @param part
	 *            the view part that owns this action group
	 */
	public ProjectActionGroup(IViewPart part) {
		fSite = part.getSite();
		ISelectionProvider provider = fSite.getSelectionProvider();
		ISelection selection = provider.getSelection();

		fCloseAction = new CloseResourceAction(fSite);
		fCloseAction
				.setActionDefinitionId("org.eclipse.ui.project.closeProject"); //$NON-NLS-1$

		fCloseUnrelatedAction = new CloseUnrelatedProjectsAction(fSite);
		fCloseUnrelatedAction.setActionDefinitionId(
				"org.eclipse.ui.project.closeUnrelatedProjects"); //$NON-NLS-1$

		fOpenAction = new OpenProjectAction(fSite);
		fOpenAction.setActionDefinitionId("org.eclipse.ui.project.openProject"); //$NON-NLS-1$
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection s = (IStructuredSelection) selection;
			fOpenAction.selectionChanged(s);
			fCloseAction.selectionChanged(s);
			fCloseUnrelatedAction.selectionChanged(s);
		}
		provider.addSelectionChangedListener(fOpenAction);
		provider.addSelectionChangedListener(fCloseAction);
		provider.addSelectionChangedListener(fCloseUnrelatedAction);
		IWorkspace workspace = ResourcesPlugin.getWorkspace();
		workspace.addResourceChangeListener(fOpenAction);
		workspace.addResourceChangeListener(fCloseAction);
		workspace.addResourceChangeListener(fCloseUnrelatedAction);
	}

	@Override
	public void fillActionBars(IActionBars actionBars) {
		super.fillActionBars(actionBars);
		actionBars.setGlobalActionHandler(
				IDEActionFactory.CLOSE_PROJECT.getId(), fCloseAction);
		actionBars.setGlobalActionHandler(
				IDEActionFactory.CLOSE_UNRELATED_PROJECTS.getId(),
				fCloseUnrelatedAction);
		actionBars.setGlobalActionHandler(IDEActionFactory.OPEN_PROJECT.getId(),
				fOpenAction);
	}

	@Override
	public void fillContextMenu(IMenuManager menu) {
		super.fillContextMenu(menu);
		if (fOpenAction.isEnabled())
			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD, fOpenAction);
		if (fCloseAction.isEnabled())
			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD, fCloseAction);
		if (fCloseUnrelatedAction.isEnabled() && areOnlyProjectsSelected(
				fCloseUnrelatedAction.getStructuredSelection()))
			menu.appendToGroup(IContextMenuConstants.GROUP_BUILD,
					fCloseUnrelatedAction);
	}

	private boolean areOnlyProjectsSelected(IStructuredSelection selection) {
		if (selection.isEmpty())
			return false;

		Iterator iter = selection.iterator();
		while (iter.hasNext()) {
			Object obj = iter.next();
			if (obj instanceof IAdaptable) {
				if (((IAdaptable) obj).getAdapter(IProject.class) == null)
					return false;
			}
		}
		return true;
	}

	/**
	 * Returns the open project action contained in this project action group.
	 *
	 * @return returns the open project action
	 *
	 * @since 3.3
	 */
	public OpenProjectAction getOpenProjectAction() {
		return fOpenAction;
	}

	@Override
	public void dispose() {
		ISelectionProvider provider = fSite.getSelectionProvider();
		provider.removeSelectionChangedListener(fOpenAction);
		provider.removeSelectionChangedListener(fCloseAction);
		provider.removeSelectionChangedListener(fCloseUnrelatedAction);
		IWorkspace workspace = ResourcesPlugin.getWorkspace();
		workspace.removeResourceChangeListener(fOpenAction);
		workspace.removeResourceChangeListener(fCloseAction);
		workspace.removeResourceChangeListener(fCloseUnrelatedAction);
		super.dispose();
	}
}