/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests.preferences;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.resource.FontRegistry;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.ILogger;
import org.eclipse.jface.util.Policy;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.eclipse.ui.tests.harness.util.UITestCase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * The FontPreferenceTestCase tests adding fonts to
 * the preference store and what occurs if the values
 * are bogus
 */

@RunWith(JUnit4.class)
public class FontPreferenceTestCase extends UITestCase {

	public String BAD_FONT_DEFINITION = "BadFont-regular-10";

	public String TEST_FONT_ID = "org.eclipse.jface.tests.preference.testfont";

	public String MISSING_FONT_ID = "org.eclipse.jface.tests.preference.missingfont";

	private IPreferenceStore preferenceStore;

	/**
	 * Constructor for FontPreferenceTestCase.
	 */
	public FontPreferenceTestCase() {
		super(FontPreferenceTestCase.class.getSimpleName());
	}

	@Override
	protected void doSetUp() throws Exception {
		super.doSetUp();
		AbstractUIPlugin plugin = WorkbenchPlugin.getDefault();
		preferenceStore = plugin.getPreferenceStore();

		//Set up the bogus entry for the bad first test
		FontData bogusData = new FontData();
		bogusData.setName("BadData");
		bogusData.setHeight(11);
		FontData[] storedValue = new FontData[2];

		//We assume here that the text font is OK
		storedValue[0] = bogusData;
		storedValue[1] = (PreferenceConverter.getDefaultFontDataArray(
				preferenceStore, JFaceResources.TEXT_FONT))[0];
		PreferenceConverter
				.setValue(preferenceStore, TEST_FONT_ID, storedValue);
		PreferenceConverter.setDefault(preferenceStore, TEST_FONT_ID,
				storedValue);

	}

	/**
	 * Test for a valid font like the test font. The first good one
	 * we should find should be the first one in the list.
	 */

	@Test
	public void testGoodFontDefinition() {

		FontRegistry fontRegistry = JFaceResources.getFontRegistry();
		FontData[] currentTextFonts = PreferenceConverter.getFontDataArray(
				preferenceStore, JFaceResources.TEXT_FONT);
		FontData[] bestFont = fontRegistry.bestDataArray(currentTextFonts,
				Display.getCurrent());

		//Assert that it is the first font that we get as the
		//valid one
		assertEquals(bestFont[0].getName(), currentTextFonts[0].getName());
		assertEquals(bestFont[0].getHeight(), currentTextFonts[0].getHeight());
	}

	/**
	 * Test that if the first font in the list is bad that the
	 * second one comes back as valid.
	 */

	@Test
	public void testBadFirstFontDefinition() {

		FontRegistry fontRegistry = JFaceResources.getFontRegistry();
		FontData[] currentTestFonts = PreferenceConverter.getFontDataArray(
				preferenceStore, TEST_FONT_ID);
		FontData[] bestFont = fontRegistry.filterData(currentTestFonts,
				Display.getCurrent());

		//Assert that it is the second font that we get as the
		//valid one
		assertEquals(bestFont[0].getName(), currentTestFonts[1].getName());
		assertEquals(bestFont[0].getHeight(), currentTestFonts[1].getHeight());
	}

	/**
	 * Test that the no valid font is returned when the entry
	 * is missing.
	 */

	@Test
	public void testNoFontDefinition() {

		FontRegistry fontRegistry = JFaceResources.getFontRegistry();
		FontData[] currentTestFonts = PreferenceConverter.getFontDataArray(
				preferenceStore, MISSING_FONT_ID);
		FontData[] bestFont = fontRegistry.filterData(currentTestFonts,
				Display.getCurrent());

		FontData[] systemFontData = Display.getCurrent().getSystemFont()
				.getFontData();

		//Assert that the first font is the system font
		assertEquals(bestFont[0].getName(), systemFontData[0].getName());
		assertEquals(bestFont[0].getHeight(), systemFontData[0].getHeight());
	}

	/**
	 * The test added to assess results of accessing FontRegistry from a non-UI
	 * thread. See bug 230360.
	 */
	@Test
	public void testNonUIThreadFontAccess() {
		// create a separate font registry to avoid contaminating other tests
		final FontRegistry fontRegistry = new FontRegistry("org.eclipse.jface.resource.jfacefonts"); //$NON-NLS-1$
		// pre-calculate the default font; calling it in worker thread will only cause SWTException
		Font defaultFont = fontRegistry.defaultFont();
		defaultFont.toString(); // avoids compiler warning

		// redirect logging so that we catch the error log
		final boolean[] errorLogged = new boolean[] { false };
		ILogger logger = Policy.getLog();
		try {
			Policy.setLog(status -> {
				if (status != null && status.getSeverity() == IStatus.ERROR && status.getPlugin().equals(Policy.JFACE)) {
					errorLogged[0] = true;
				}
			} );


			Job job = new Job("Non-UI thread FontRegistry Access Test") {
				@Override
				protected IStatus run(IProgressMonitor monitor) {
					// this should produce no exception, but should log a error
					boolean created = checkFont(fontRegistry);
					assertFalse(created);
					return Status.OK_STATUS;
				}
			};
			job.schedule();
			job.join();
			assertTrue(errorLogged[0]);
		} catch (InterruptedException e) {
			fail("Worker thread was interrupted in the FontRegistry access test");
		} finally {
			Policy.setLog(logger);
		}

		// now let's try to create the same font in the UI thread and check that the correct
		boolean created = checkFont(fontRegistry);
		assertTrue(created);
	}

	public boolean checkFont(final FontRegistry fontRegistry) {
		// Create a font description that will use default font with height increased by 20
		FontData[] data = fontRegistry.defaultFont().getFontData();
		int defaultHeight = data[0].getHeight();
		int testHeight = defaultHeight + 20;
		data[0].setHeight(testHeight);
		fontRegistry.put("testFont", data);

		// Get the font from the registry
		Font testFont = fontRegistry.get("testFont"); // getItalic("testFont");

		// Check the font size
		FontData[] receivedData = testFont.getFontData();
		int receivedHeight = receivedData[0].getHeight();
		// giving a bit leeway to the OS: the size might not match exactly
		// so test size not being the default rather then being exactly the testHeight
		return (receivedHeight != defaultHeight);
	}

}