/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2011 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
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.examples.tutorial.features;

import org.eclipse.emf.ecore.EClass;
import org.eclipse.graphiti.examples.tutorial.StyleUtil;
import org.eclipse.graphiti.features.IDirectEditingInfo;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.IAddContext;
import org.eclipse.graphiti.features.impl.AbstractAddShapeFeature;
import org.eclipse.graphiti.mm.algorithms.Ellipse;
import org.eclipse.graphiti.mm.algorithms.Polyline;
import org.eclipse.graphiti.mm.algorithms.Rectangle;
import org.eclipse.graphiti.mm.algorithms.RoundedRectangle;
import org.eclipse.graphiti.mm.algorithms.Text;
import org.eclipse.graphiti.mm.pictograms.BoxRelativeAnchor;
import org.eclipse.graphiti.mm.pictograms.ContainerShape;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.graphiti.mm.pictograms.Shape;
import org.eclipse.graphiti.services.Graphiti;
import org.eclipse.graphiti.services.IGaService;
import org.eclipse.graphiti.services.IPeCreateService;

public class TutorialAddEClassFeature extends AbstractAddShapeFeature {

	// the additional size of the invisible rectangle at the right border
	// (this also equals the half width of the anchor to paint there)
	public static final int INVISIBLE_RECT_RIGHT = 6;

	public TutorialAddEClassFeature(IFeatureProvider fp) {
		super(fp);
	}

	public boolean canAdd(IAddContext context) {
		// check if user wants to add a EClass
		final Object newObject = context.getNewObject();
		if (newObject instanceof EClass) {
			// check if user wants to add to a diagram
			if (context.getTargetContainer() instanceof Diagram) {
				return true;
			}
		}
		return false;
	}

	public PictogramElement add(IAddContext context) {
		final EClass addedClass = (EClass) context.getNewObject();
		final Diagram targetDiagram = (Diagram) context.getTargetContainer();

		// CONTAINER SHAPE WITH ROUNDED RECTANGLE
		final IPeCreateService peCreateService = Graphiti.getPeCreateService();
		final ContainerShape containerShape = peCreateService.createContainerShape(targetDiagram, true);

		// check whether the context has a size (e.g. from a create feature)
		// otherwise define a default size for the shape
		final int width = context.getWidth() <= 0 ? 100 : context.getWidth();
		final int height = context.getHeight() <= 0 ? 50 : context.getHeight();

		final IGaService gaService = Graphiti.getGaService();
		RoundedRectangle roundedRectangle; // need to access it later
		{
			// create invisible outer rectangle expanded by
			// the width needed for the anchor
			final Rectangle invisibleRectangle = gaService.createInvisibleRectangle(containerShape);
			gaService.setLocationAndSize(invisibleRectangle, context.getX(), context.getY(), width + INVISIBLE_RECT_RIGHT, height);

			// create and set visible rectangle inside invisible rectangle
			roundedRectangle = gaService.createPlainRoundedRectangle(invisibleRectangle, 5, 5);
			roundedRectangle.setStyle(StyleUtil.getStyleForEClass(getDiagram()));
			gaService.setLocationAndSize(roundedRectangle, 0, 0, width, height);

			// if addedClass has no resource we add it to the resource of the diagram
			// in a real scenario the business model would have its own resource
			if (addedClass.eResource() == null) {
				getDiagram().eResource().getContents().add(addedClass);
			}

			// create link and wire it
			link(containerShape, addedClass);
		}

		// SHAPE WITH LINE
		{
			// create shape for line
			final Shape shape = peCreateService.createShape(containerShape, false);

			// create and set graphics algorithm
			final Polyline polyline = gaService.createPlainPolyline(shape, new int[] { 0, 20, width, 20 });
			polyline.setStyle(StyleUtil.getStyleForEClass(getDiagram()));
		}

		// SHAPE WITH TEXT
		{
			// create shape for text
			final Shape shape = peCreateService.createShape(containerShape, false);

			// create and set text graphics algorithm
			final Text text = gaService.createPlainText(shape, addedClass.getName());
			text.setStyle(StyleUtil.getStyleForEClassText(getDiagram()));
			gaService.setLocationAndSize(text, 0, 0, width, 20);

			// create link and wire it
			link(shape, addedClass);

			// provide information to support direct-editing directly
			// after object creation (must be activated additionally)
			final IDirectEditingInfo directEditingInfo = getFeatureProvider().getDirectEditingInfo();
			// set container shape for direct editing after object creation
			directEditingInfo.setMainPictogramElement(containerShape);
			// set shape and graphics algorithm where the editor for
			// direct editing shall be opened after object creation
			directEditingInfo.setPictogramElement(shape);
			directEditingInfo.setGraphicsAlgorithm(text);
		}

		// add a chopbox anchor to the shape
		peCreateService.createChopboxAnchor(containerShape);

		// create an additional box relative anchor at middle-right
		final BoxRelativeAnchor boxAnchor = peCreateService.createBoxRelativeAnchor(containerShape);
		boxAnchor.setRelativeWidth(1.0);
		boxAnchor.setRelativeHeight(0.38); // Use golden section

		// anchor references visible rectangle instead of invisible rectangle
		boxAnchor.setReferencedGraphicsAlgorithm(roundedRectangle);

		// assign a graphics algorithm for the box relative anchor
		final Ellipse ellipse = gaService.createPlainEllipse(boxAnchor);

		// anchor is located on the right border of the visible rectangle
		// and touches the border of the invisible rectangle
		final int w = INVISIBLE_RECT_RIGHT;
		gaService.setLocationAndSize(ellipse, -w, -w, 2 * w, 2 * w);
		ellipse.setStyle(StyleUtil.getStyleForEClass(getDiagram()));

		// call the layout feature
		layoutPictogramElement(containerShape);

		return containerShape;
	}
}