/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2013, 2013 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:
 *    mwenz - Bug 415884 - Cannot query size of a multi-line text
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.ui.tests;

import static org.junit.Assert.fail;

import org.eclipse.graphiti.datatypes.IDimension;
import org.eclipse.graphiti.mm.algorithms.AlgorithmsFactory;
import org.eclipse.graphiti.mm.algorithms.MultiText;
import org.eclipse.graphiti.mm.algorithms.Text;
import org.eclipse.graphiti.mm.algorithms.styles.Font;
import org.eclipse.graphiti.mm.algorithms.styles.StylesFactory;
import org.eclipse.graphiti.mm.algorithms.styles.StylesPackage;
import org.eclipse.graphiti.tests.reuse.GFAbstractTestCase;
import org.eclipse.graphiti.ui.services.GraphitiUi;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;

public class LayoutServiceTest extends GFAbstractTestCase {

	private static final String LINE_SEPARATOR = System.getProperty("line.separator");
	private static Font font;

	@BeforeClass
	public static void before() {
		GFAbstractTestCase.before();

		font = StylesFactory.eINSTANCE.createFont();
		font.eSet(StylesPackage.eINSTANCE.getFont_Name(), "dummy");
	}

	@Test
	public void testPlainCalculation() throws Exception {
		IDimension textSize1 = GraphitiUi.getUiLayoutService().calculateTextSize("Plain text", font);
		IDimension textSize2 = GraphitiUi.getUiLayoutService().calculateTextSize(
				"Plain text " + LINE_SEPARATOR + " continued", font);

		checkEquivalentHeight(textSize1, textSize2);
		Assert.assertTrue(textSize1.getWidth() < textSize2.getWidth());
	}

	@Test
	public void testNewLineCalculation() throws Exception {
		IDimension textSize1 = GraphitiUi.getUiLayoutService().calculateTextSize("Plain text", font, true);
		IDimension textSize2 = GraphitiUi.getUiLayoutService().calculateTextSize(
				"Plain text " + LINE_SEPARATOR + " continued", font, true);

		checkExpectedHeight(textSize1, 16);
		checkExpectedHeight(textSize2, 32);
	}

	@Test
	public void testPlainTextCalculation() throws Exception {
		Text text1 = AlgorithmsFactory.eINSTANCE.createText();
		text1.setFont(font);
		text1.setValue("Plain text");

		Text text2 = AlgorithmsFactory.eINSTANCE.createText();
		text2.setFont(font);
		text2.setValue("Plain text " + LINE_SEPARATOR + " continued");

		IDimension textSize1 = GraphitiUi.getUiLayoutService().calculateTextSize(text1);
		IDimension textSize2 = GraphitiUi.getUiLayoutService().calculateTextSize(text2);

		checkEquivalentHeight(textSize1, textSize2);
		Assert.assertTrue(textSize1.getWidth() < textSize2.getWidth());
	}

	@Test
	public void testMultiTextCalculation() throws Exception {
		MultiText text1 = AlgorithmsFactory.eINSTANCE.createMultiText();
		text1.setFont(font);
		text1.setValue("Plain text");

		MultiText text2 = AlgorithmsFactory.eINSTANCE.createMultiText();
		text2.setFont(font);
		text2.setValue("Plain text " + LINE_SEPARATOR + " continued");

		IDimension textSize1 = GraphitiUi.getUiLayoutService().calculateTextSize(text1);
		IDimension textSize2 = GraphitiUi.getUiLayoutService().calculateTextSize(text2);

		checkExpectedHeight(textSize1, 16);
		checkExpectedHeight(textSize2, 32);
	}

	private void checkEquivalentHeight(IDimension dimension1, IDimension dimension2) {
		// On Linux the heights of the dimensions differ by one or two (15 and
		// 16 or 17), while on Windows they are the same; the difference of two
		// appeared first after moving to the own HIPP instance
		// --> accept the difference on Linux as valid

		int height1 = dimension1.getHeight();
		int height2 = dimension2.getHeight();

		int difference = Math.abs(height1 - height2);

		if (!(difference <= 2)) {
			fail("ERROR: Difference too large: height1: " + height1 + ", height2: " + height2);
		}
	}

	private void checkExpectedHeight(IDimension dimension, int expectedHeight) {
		// On Linux the heights of the dimensions differ by one or two (15 and
		// 16 or 17), while on Windows they are the same; the difference of two
		// appeared first after moving to the own HIPP instance
		// --> accept the difference on Linux as valid

		int height = dimension.getHeight();

		int difference = Math.abs(height - expectedHeight);

		if (!(difference <= 2)) {
			fail("ERROR: Difference too large: height: " + height + ", expected height: " + expectedHeight);
		}
	}
}