/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2012 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *    mgorning - Bug 376572 - Generic context buttons name changeable via getName() method
 *    cbrand - Bug 385586 - Remove,Delete, Update Action (ContextMenu, ButtonPad etc.)
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.tb;

import org.eclipse.graphiti.features.IDeleteFeature;
import org.eclipse.graphiti.features.IFeature;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.IRemoveFeature;
import org.eclipse.graphiti.features.IUpdateFeature;
import org.eclipse.graphiti.features.context.IContext;
import org.eclipse.graphiti.features.context.IDeleteContext;
import org.eclipse.graphiti.features.context.IRemoveContext;
import org.eclipse.graphiti.features.context.IUpdateContext;
import org.eclipse.graphiti.features.context.impl.DeleteContext;
import org.eclipse.graphiti.features.context.impl.RemoveContext;
import org.eclipse.graphiti.features.context.impl.UpdateContext;
import org.eclipse.graphiti.internal.Messages;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.graphiti.platform.IPlatformImageConstants;

/**
 * The Class ContextEntryHelper comprises methods for creating and modifying
 * context button entries.
 */
public class ContextEntryHelper {

	/**
	 * Creates an default update context button entry.
	 * 
	 * @param featureProvider
	 *            the feature provider
	 * @param pe
	 *            the pictogram element
	 * @return the created default update context button entry
	 */
	public static IContextButtonEntry createDefaultUpdateContextButton(IFeatureProvider featureProvider,
			PictogramElement pe) {
		final IUpdateContext updateContext = new UpdateContext(pe);
		final IUpdateFeature updateFeature = featureProvider.getUpdateFeature(updateContext);
		IContextButtonEntry ret = null;
		if (checkFeatureAvalability(updateFeature, updateContext)) {
			ret = new ContextButtonEntry(updateFeature, updateContext) {
				@Override
				public boolean canExecute() {
					return super.canExecute() && updateFeature.updateNeeded(updateContext).toBoolean();
				}
			};
			markAsUpdateContextEntry(ret);
		}
		return ret;
	}

	/**
	 * Creates an default remove context button entry.
	 * 
	 * @param featureProvider
	 *            the feature provider
	 * @param pe
	 *            the pictogram element
	 * @return the created default remove context button entry
	 */
	public static IContextButtonEntry createDefaultRemoveContextButton(IFeatureProvider featureProvider,
			PictogramElement pe) {
		IRemoveContext removeContext = new RemoveContext(pe);
		IRemoveFeature removeFeature = featureProvider.getRemoveFeature(removeContext);
		IContextButtonEntry ret = null;
		if (checkFeatureAvalability(removeFeature, removeContext)) {
			ret = new ContextButtonEntry(removeFeature, removeContext);
			markAsRemoveContextEntry(ret);
		}
		return ret;
	}

	/**
	 * Creates an default delete context button entry.
	 * 
	 * @param featureProvider
	 *            the feature provider
	 * @param pe
	 *            the pictogram element
	 * @return the created default delete context button entry
	 */
	public static IContextButtonEntry createDefaultDeleteContextButton(IFeatureProvider featureProvider,
			PictogramElement pe) {
		IDeleteContext deleteContext = new DeleteContext(pe);
		IDeleteFeature deleteFeature = featureProvider.getDeleteFeature(deleteContext);
		IContextButtonEntry ret = null;
		if (checkFeatureAvalability(deleteFeature, deleteContext)) {
			ret = new ContextButtonEntry(deleteFeature, deleteContext);
			markAsDeleteContextEntry(ret);
		}
		return ret;
	}

	/**
	 * Creates collapse button entry or expand button entry as indicated by
	 * parameter collapse.
	 * 
	 * @param collapse
	 *            creates a collapse button entry when true, otherwise a expand
	 *            button entry
	 * @param customFeature
	 *            the custom feature
	 * @param customContext
	 *            the custom context
	 * @return the created collapse button
	 */
	public static IContextButtonEntry createCollapseContextButton(boolean collapse, IFeature customFeature,
			IContext customContext) {
		IContextButtonEntry ret = null;
		ret = new ContextButtonEntry(customFeature, customContext);
		if (collapse) {
			ret.setText(Messages.ContextEntryHelper_10_xfld);
			ret.setDescription(Messages.ContextEntryHelper_11_xfld);
			ret.setIconId(IPlatformImageConstants.IMG_EDIT_COLLAPSE);
		} else {
			ret.setText(Messages.ContextEntryHelper_12_xfld);
			ret.setDescription(Messages.ContextEntryHelper_13_xfld);
			ret.setIconId(IPlatformImageConstants.IMG_EDIT_EXPAND);
		}
		return ret;
	}

	/**
	 * Marks the given context entry with update figure.
	 * 
	 * @param entry
	 *            the context entry
	 */
	public static void markAsUpdateContextEntry(IContextEntry entry) {
		if (entry != null) {
			setTextAndDescription(entry, Messages.ContextEntryHelper_0_xfld, Messages.ContextEntryHelper_1_xfld);
			entry.setIconId(IPlatformImageConstants.IMG_EDIT_REFRESH);
		}
	}

	/**
	 * Marks the given context entry with remove figure from diagram.
	 * 
	 * @param entry
	 *            the context entry
	 */
	public static void markAsRemoveContextEntry(IContextEntry entry) {
		if (entry != null) {
			setTextAndDescription(entry, Messages.ContextEntryHelper_2_xfld, Messages.ContextEntryHelper_3_xfld);
			entry.setIconId(IPlatformImageConstants.IMG_EDIT_REMOVE);
		}
	}

	/**
	 * Marks the given context entry with delete from model.
	 * 
	 * @param entry
	 *            the context entry
	 */
	public static void markAsDeleteContextEntry(IContextEntry entry) {
		if (entry != null) {
			setTextAndDescription(entry, Messages.ContextEntryHelper_4_xfld, Messages.ContextEntryHelper_5_xfld);
			entry.setIconId(IPlatformImageConstants.IMG_EDIT_DELETE);
		}
	}

	public static final String NAME = Messages.ContextEntryHelper_5_xfld;

	/**
	 * Marks the given context entry with collapse or expand figure.
	 * 
	 * @param entry
	 *            the context entry
	 * @param collapse
	 *            mark with collapse when true, otherwise with expand
	 */
	public static void markAsCollapseContextEntry(IContextEntry entry, boolean collapse) {
		if (entry != null) {
			if (collapse) {
				entry.setText(Messages.ContextEntryHelper_6_xfld);
				entry.setDescription(Messages.ContextEntryHelper_7_xfld);
				entry.setIconId(IPlatformImageConstants.IMG_EDIT_COLLAPSE);
			} else {
				entry.setText(Messages.ContextEntryHelper_8_xfld);
				entry.setDescription(Messages.ContextEntryHelper_9_xfld);
				entry.setIconId(IPlatformImageConstants.IMG_EDIT_EXPAND);
			}
		}
	}

	private static void setTextAndDescription(IContextEntry entry, String defaultText, String defaultDescription) {
		String entryText = defaultText;
		String entryDescription = defaultDescription;
		IFeature f = entry.getFeature();
		if (f != null) {
			if (f.getName() != null) {
				entryText = f.getName();
			}
			if (f.getDescription() != null) {
				entryDescription = f.getDescription();
			}
		}
		entry.setText(entryText);
		entry.setDescription(entryDescription);
	}

	private static boolean checkFeatureAvalability(IFeature feature, IContext context) {
		return feature != null && feature.isAvailable(context);
	}

}