/*******************************************************************************

 *  Copyright (c) 2011 GitHub Inc.

 *  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:

 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation

 *******************************************************************************/

package org.eclipse.mylyn.internal.commons.ui.identity.gravatar;

import org.eclipse.core.runtime.Assert;

import org.eclipse.mylyn.commons.identity.gravatar.Gravatar;

import org.eclipse.mylyn.commons.identity.gravatar.GravatarCallbackAdapter;

import org.eclipse.mylyn.commons.identity.gravatar.IGravatarCallback;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.PlatformUI;

/**

 * Class to wrap an {@link IGravatarCallback} instance and run it as a runnable on the UI-thread.

 * 

 * @author Kevin Sawicki (kevin@github.com)

 */

public class GravatarDisplayCallback extends GravatarCallbackAdapter {

	private final IGravatarCallback wrapped;

	private boolean async = true;

	/**

	 * Create gravatar display callback

	 * 

	 * @param callback

	 */

	public GravatarDisplayCallback(IGravatarCallback callback) {

		Assert.isNotNull(callback, "Callback cannot be null"); //$NON-NLS-1$

		this.wrapped = callback;

	}

	/**

	 * Set async execution of wrapped callback

	 * 

	 * @param async

	 * @return this callback

	 */

	public GravatarDisplayCallback setAsync(boolean async) {

		this.async = async;

		return this;

	}

	private void displayExec(Runnable runnable) {

		Display display = PlatformUI.getWorkbench().getDisplay();

		if (this.async) {

			display.asyncExec(runnable);

		} else {

			display.syncExec(runnable);

		}

	}

	/**

	 * @see org.eclipse.mylyn.commons.identity.gravatar.GravatarCallbackAdapter#loaded(org.eclipse.mylyn.commons.identity.gravatar.Gravatar)

	 */

	@Override

	public void loaded(final Gravatar avatar) {

		Runnable runnable = new Runnable() {

			public void run() {

				wrapped.loaded(avatar);

			}

		};

		displayExec(runnable);

	}

	/**

	 * @see org.eclipse.mylyn.commons.identity.gravatar.GravatarCallbackAdapter#error(java.lang.Exception)

	 */

	@Override

	public void error(final Exception exception) {

		Runnable runnable = new Runnable() {

			public void run() {

				wrapped.error(exception);

			}

		};

		displayExec(runnable);

	}

}

/*******************************************************************************

 *  Copyright (c) 2011 GitHub Inc.

 *  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:

 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation

 *******************************************************************************/

package org.eclipse.mylyn.internal.commons.ui.identity.gravatar;

import java.io.ByteArrayInputStream;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jface.resource.ImageDescriptor;

import org.eclipse.mylyn.commons.identity.gravatar.Gravatar;

import org.eclipse.swt.SWT;

import org.eclipse.swt.SWTException;

import org.eclipse.swt.graphics.GC;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.ImageData;

import org.eclipse.swt.graphics.ImageLoader;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.PlatformUI;

/**

 * Gravatar image class.

 * 

 * @author Kevin Sawicki (kevin@github.com)

 */

public class GravatarImage {

	private final Gravatar gravatar;

	private ImageData data;

	/**

	 * Create avatar image from avatar

	 * 

	 * @param avatar

	 */

	public GravatarImage(Gravatar avatar) {

		Assert.isNotNull(avatar, "Avatar cannot be null"); //$NON-NLS-1$

		this.gravatar = avatar;

	}

	/**

	 * Get avatar image data

	 * 

	 * @return image data

	 */

	public ImageData getData() {

		if (this.data != null) {

			return this.data;

		}

		try {

			ImageData[] images = new ImageLoader().load(new ByteArrayInputStream(gravatar.getBytes()));

			if (images.length > 0) {

				this.data = images[0];

			} else {

				this.data = ImageDescriptor.getMissingImageDescriptor().getImageData();

			}

		} catch (SWTException exception) {

			this.data = ImageDescriptor.getMissingImageDescriptor().getImageData();

		}

		return this.data;

	}

	/**

	 * Get avatar image scaled to specified size. The returned image should be managed and properly disposed of by the

	 * caller.

	 * 

	 * @param size

	 * @return scaled image

	 */

	public Image getScaledImage(int size) {

		Display display = PlatformUI.getWorkbench().getDisplay();

		Image image = new Image(display, getData());

		Rectangle sourceBounds = image.getBounds();

		// Return original image and don't scale if size matches request

		if (sourceBounds.width == size) {

			return image;

		}

		Image scaled = new Image(display, size, size);

		GC gc = new GC(scaled);

		try {

			gc.setAntialias(SWT.ON);

			gc.setInterpolation(SWT.HIGH);

			Rectangle targetBounds = scaled.getBounds();

			gc.drawImage(image, 0, 0, sourceBounds.width, sourceBounds.height, 0, 0, targetBounds.width,

					targetBounds.height);

		} finally {

			gc.dispose();

			image.dispose();

		}

		return scaled;

	}

}