/*******************************************************************************
 * <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.internal.services.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.graphiti.mm.algorithms.AbstractText;
import org.eclipse.graphiti.mm.algorithms.styles.Font;
import org.eclipse.graphiti.mm.algorithms.styles.Style;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.services.Graphiti;
import org.eclipse.graphiti.services.IMigrationService;

public class MigrationServiceImpl implements IMigrationService {

	public void migrate070To080(Diagram d) {

		// Traverse model and collect fonts
		Map<Font, ArrayList<EObject>> fontToUser = new HashMap<Font, ArrayList<EObject>>();
		Resource eResource = d.eResource();
		TreeIterator<EObject> allContents = eResource.getAllContents();
		while (allContents.hasNext()) {
			EObject eObject = allContents.next();
			if (eObject instanceof AbstractText) {
				AbstractText t = (AbstractText) eObject;
				Font font = t.getFont();
				addFontUser(fontToUser, eObject, font);
			} else if (eObject instanceof Style) {
				Style s = (Style) eObject;
				Font font = s.getFont();
				addFontUser(fontToUser, eObject, font);
			}
		}

		// Manage collected fonts and set the new font on the respective
		// elements. Includes possibly a write.
		// The caller has to use a write transaction.
		for (Font font : fontToUser.keySet()) {
			Font newFont = Graphiti.getGaService().manageFont(d, font.getName(), font.getSize(), font.isItalic(), font.isBold());
			ArrayList<EObject> fontUsers = fontToUser.get(font);
			for (EObject fontUser : fontUsers) {
				if (fontUser instanceof AbstractText) {
					((AbstractText) fontUser).setFont(newFont);
				} else {
					((Style) fontUser).setFont(newFont);
				}
			}
		}
	}

	public void migrate080To090(Diagram d) {
		// Traverse model and and set unfilled texts to filled
		Resource eResource = d.eResource();
		TreeIterator<EObject> allContents = eResource.getAllContents();
		while (allContents.hasNext()) {
			EObject eObject = allContents.next();
			if (eObject instanceof AbstractText) {
				AbstractText t = (AbstractText) eObject;
				if (t.getFilled()) {
					t.setFilled(Boolean.FALSE);
				}
			}
		}
	}

	public boolean shouldMigrate080To090(Diagram d) {
		String version = d.getVersion();
		if (version == null || version.length() == 0) {
			Resource eResource = d.eResource();
			TreeIterator<EObject> allContents = eResource.getAllContents();
			while (allContents.hasNext()) {
				EObject eObject = allContents.next();
				if (eObject instanceof AbstractText) {
					return true;
				}
			}
		}
		return false;
	}


	private void addFontUser(Map<Font, ArrayList<EObject>> fontToUser, EObject fontUser, Font font) {
		if (font != null) {
			if (fontToUser.get(font) == null) {
				fontToUser.put(font, new ArrayList<EObject>());
			}
			fontToUser.get(font).add(fontUser);
		}
	}

	public boolean shouldMigrate070To080(Diagram d) {
		// Traverse model and collect fonts
		HashSet<Font> fonts = new HashSet<Font>();
		Resource eResource = d.eResource();
		TreeIterator<EObject> allContents = eResource.getAllContents();
		while (allContents.hasNext()) {
			EObject next = allContents.next();
			if (next instanceof AbstractText) {
				AbstractText t = (AbstractText) next;
				Font font = t.getFont();
				if (font != null)
					fonts.add(font);

			} else if (next instanceof Style) {
				Style s = (Style) next;
				Font font = s.getFont();
				if (font != null)
					fonts.add(font);
			}
		}
		for (Font font : fonts) {

			if (!d.getFonts().contains(font))
				return true;
		}
		return false;
	}
}