/*******************************************************************************
 * Copyright (c) 2004 - 2006 University Of British Columbia 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
 *
 * Contributors:
 *     University Of British Columbia - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylar.internal.ui.actions;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.mylar.internal.ui.UiUtil;
import org.eclipse.mylar.provisional.core.IMylarElement;
import org.eclipse.mylar.provisional.core.IMylarStructureBridge;
import org.eclipse.mylar.provisional.core.MylarPlugin;
import org.eclipse.mylar.provisional.tasklist.MylarTaskListPlugin;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IViewActionDelegate;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.ObjectPluginAction;

/**
 * @author Mik Kersten
 */
public abstract class AbstractInterestManipulationAction implements IViewActionDelegate, IWorkbenchWindowActionDelegate {

	private static final String MESSAGE_NO_CONTEXT = "No task context is active, or element not found in context";

	public static final String SOURCE_ID = "org.eclipse.mylar.ui.interest.user";

	protected IViewPart view;

	public void init(IWorkbenchWindow window) {
		// don't have anything to initialize
	}

	public void init(IViewPart view) {
		this.view = view;
	}

	protected abstract boolean isIncrement();

	public void run(IAction action) {
		boolean increment = isIncrement();
		ISelection currentSelection = null;
		if (action instanceof ObjectPluginAction) {
			ObjectPluginAction objectAction = (ObjectPluginAction) action;
			currentSelection = objectAction.getSelection();
		} else {
			try {
				currentSelection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getSelection();
			} catch (Exception e) {
				// ignore
			}
		}

		if (currentSelection instanceof StructuredSelection) {
			StructuredSelection selection = (StructuredSelection) currentSelection;
			for (Object object : selection.toList()) {
				IMylarElement node = null;
				if (object instanceof IMylarElement) {
					node = (IMylarElement) object;
				} else {
					IMylarStructureBridge bridge = MylarPlugin.getDefault().getStructureBridge(object);
					String handle = bridge.getHandleIdentifier(object);
					node = MylarPlugin.getContextManager().getElement(handle);
				}
				if (node != null) {
					boolean manipulated = MylarPlugin.getContextManager().manipulateInterestForElement(node, increment, false, SOURCE_ID);
					if (!manipulated) {
						UiUtil.displayInterestManipulationFailure();
					}
				} else {
					MessageDialog.openInformation(Display.getCurrent().getActiveShell(), 
							MylarTaskListPlugin.TITLE_DIALOG, MESSAGE_NO_CONTEXT);
				}
			}
		} else {
			IMylarElement node = MylarPlugin.getContextManager().getActiveElement();
			if (node != null) {
				boolean manipulated = MylarPlugin.getContextManager().manipulateInterestForElement(node, increment, false, SOURCE_ID);
				if (!manipulated) {
					UiUtil.displayInterestManipulationFailure();
				}
			} else {
				MessageDialog.openInformation(Display.getCurrent().getActiveShell(), 
						MylarTaskListPlugin.TITLE_DIALOG, MESSAGE_NO_CONTEXT);
//				MylarStatusHandler.log("no active element for interest manipulation", this);
			}
		}
	}

	public void dispose() {
		// ignore
	}

	public void selectionChanged(IAction action, ISelection selection) {
		// ignore
	}
}