/*
 * Copyright (c) 2014, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.spi.impl.swt.common.image;

import java.io.InputStream;
import java.net.URL;

import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.jowidgets.common.image.IImageDescriptor;
import org.jowidgets.common.types.Dimension;
import org.jowidgets.common.types.Position;
import org.jowidgets.common.types.Rectangle;
import org.jowidgets.spi.graphics.IGraphicContextSpi;
import org.jowidgets.spi.image.IBufferedImageSpi;
import org.jowidgets.spi.image.IImageFactorySpi;
import org.jowidgets.spi.image.IImageSpi;
import org.jowidgets.spi.impl.image.AbstractImageSpiImpl;
import org.jowidgets.spi.impl.image.StreamFactoryImageDecriptorImpl;
import org.jowidgets.spi.impl.image.UrlImageDescriptorImpl;
import org.jowidgets.spi.impl.swt.common.graphics.GraphicContextSpiImpl;
import org.jowidgets.util.Assert;
import org.jowidgets.util.IFactory;
import org.jowidgets.util.IProvider;

public final class SwtImageFactory implements IImageFactorySpi {

    private final SwtImageRegistry imageRegistry;
    private final SwtImageHandleFactory imageHandleFactory;
    private final IProvider<Display> displayProvider;

    public SwtImageFactory(
        final SwtImageRegistry imageRegistry,
        final SwtImageHandleFactory imageHandleFactory,
        final IProvider<Display> displayProvider) {

        Assert.paramNotNull(imageRegistry, "imageRegistry");
        Assert.paramNotNull(imageHandleFactory, "imageHandleFactory");
        Assert.paramNotNull(displayProvider, "displayProvider");

        this.imageRegistry = imageRegistry;
        this.imageHandleFactory = imageHandleFactory;
        this.displayProvider = displayProvider;
    }

    @Override
    public IBufferedImageSpi createBufferedImage(final int width, final int height) {
        return new BufferedImageSpi(new Image(displayProvider.get(), width, height));
    }

    @Override
    public IImageSpi createImage(final IFactory<InputStream> inputStream) {
        Assert.paramNotNull(inputStream, "inputStream");
        final IImageDescriptor descriptor = new StreamFactoryImageDecriptorImpl(inputStream);
        return new ImageSpiImpl(imageHandleFactory.createImageHandle(descriptor));
    }

    @Override
    public IImageSpi createImage(final URL url) {
        Assert.paramNotNull(url, "url");
        final IImageDescriptor descriptor = new UrlImageDescriptorImpl(url);
        return new ImageSpiImpl(imageHandleFactory.createImageHandle(descriptor));
    }

    private class ImageSpiImpl extends AbstractImageSpiImpl<Image> {

        ImageSpiImpl(final SwtImageHandle imageHandle) {
            super(imageHandle);
        }

        @Override
        public Dimension getSize() {
            checkDisposed();
            final org.eclipse.swt.graphics.Rectangle bounds = getImageHandle().getImage().getBounds();
            return new Dimension(bounds.width, bounds.height);
        }

    }

    private final class BufferedImageSpi extends ImageSpiImpl implements IBufferedImageSpi {

        private GraphicContextSpiImpl graphicContext;

        BufferedImageSpi(final Image image) {
            super(new SwtImageHandle(image));
        }

        @Override
        public synchronized IGraphicContextSpi getGraphicContext() {
            if (graphicContext == null) {
                graphicContext = createGraphicContext();
            }
            return graphicContext;
        }

        private GraphicContextSpiImpl createGraphicContext() {
            return new GraphicContextSpiImpl(
                new GC(getImageHandle().getImage()),
                new Rectangle(new Position(0, 0), getSize()),
                imageRegistry);
        }

    }

}