/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2013 Jaspersoft Corporation. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.jasperreports.engine;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.geom.Dimension2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.ColorModel;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.lang.ref.SoftReference;
import java.net.URL;

import net.sf.jasperreports.engine.type.ImageTypeEnum;
import net.sf.jasperreports.engine.type.OnErrorTypeEnum;
import net.sf.jasperreports.engine.type.RenderableTypeEnum;
import net.sf.jasperreports.engine.util.JRImageLoader;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.engine.util.JRTypeSniffer;
import net.sf.jasperreports.repo.RepositoryUtil;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


/**
 * Provides functionality for image rendering.
 * <p/>
 * The content of an image element can come either directly from an image file like a JPG,
 * GIF, PNG, or can be a Scalable Vector Graphics (SVG) file that is rendered using some
 * business logic or a special graphics API like a charting or a barcode library. Either way,
 * JasperReports treats images in a very transparent way because it relies on a special
 * interface called {@link net.sf.jasperreports.engine.Renderable} to offer a common
 * way to render images.
 * <p/>
 * The {@link net.sf.jasperreports.engine.Renderable} interface has a method called 
 * <code>render(JasperReportsContext jasperReportsContext, Graphics2D grx, Rectangle2D rectangle)</code>,
 * which gets called by the engine each time it needs to draw the image
 * on a given device or graphic context. This approach provides the best quality for the
 * SVG images when they must be drawn on unknown devices or zoomed into without
 * losing sharpness.
 * <p/>
 * Other methods specified in this interface can be used to obtain the native size of the
 * actual image that the renderer wraps or the binary data for an image that must be stored
 * in a separate file during export.
 * <p/>
 * The library comes with a default implementation for the 
 * {@link net.sf.jasperreports.engine.Renderable} interface that
 * wraps images that come from files or binary image data in JPG, GIF, or PNG format.
 * This is the {@link net.sf.jasperreports.engine.JRImageRenderer} class, which is actually a container
 * for the binary image data, used to load a <code>java.awt.Image</code> object from it.
 * Then it draws the loaded image on the supplied <code>java.awt.Graphics2D</code> context when the engine
 * requires it.
 * <p/>
 * Image renderers are serializable because inside the generated document for each image is
 * a renderer object kept as reference, which is serialized along with the whole
 * JasperPrint object.
 * <p/>
 * When a {@link net.sf.jasperreports.engine.JRImageRenderer} instance is serialized, 
 * so is the binary image data it contains.
 * <p/>
 * However, if the image element must be lazy loaded (see the <code>isLazy</code> image attribute), then the
 * engine will not load the binary image data at report-filling time. Rather, it stores inside
 * the renderer only the <code>java.lang.String</code> location of the image. The actual image data
 * is loaded only when needed for rendering at report-export or view time.
 * <p/>
 * To simplify the implementation of SVG image renderers, JasperReports ships with an
 * abstract rendered {@link net.sf.jasperreports.engine.JRAbstractSvgRenderer}. This
 * implementation contains the code to produce binary image data from the SVG graphic in
 * JPG format. This is needed when the image must be stored in separate files on disk or
 * delivered in binary format to a consumer (like a web browser).
 * 
 * @see net.sf.jasperreports.engine.JRAbstractSvgRenderer
 * @author Teodor Danciu (teodord@users.sourceforge.net)
 * @version $Id: JRImageRenderer.java 7043 2014-04-24 12:11:59Z shertage $
 */
public class JRImageRenderer extends JRAbstractRenderer
{

	/**
	 *
	 */
	private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;

	private static final Log log = LogFactory.getLog(JRImageRenderer.class);
	
	/**
	 *
	 */
	private byte[] imageData;
	private String imageLocation;
	private ImageTypeEnum imageTypeValue = ImageTypeEnum.UNKNOWN;

	/**
	 *
	 */
	private transient SoftReference<Image> awtImageRef;


	/**
	 *
	 */
	protected JRImageRenderer(byte[] imageData)
	{
		this.imageData = imageData;
		
		if(imageData != null) 
		{
			imageTypeValue = JRTypeSniffer.getImageTypeValue(imageData);
		}
			
	}


	/**
	 *
	 */
	protected JRImageRenderer(String imageLocation)
	{
		this.imageLocation = imageLocation;
	}


	/**
	 *
	 */
	public static JRImageRenderer getInstance(byte[] imageData)
	{
		return new JRImageRenderer(imageData);
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(String)}.
	 */
	public static JRRenderable getInstance(String imageLocation) throws JRException
	{
		return RenderableUtil.getInstance(DefaultJasperReportsContext.getInstance()).getRenderable(imageLocation);
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(String, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(String imageLocation, OnErrorTypeEnum onErrorType) throws JRException
	{
		return RenderableUtil.getInstance(DefaultJasperReportsContext.getInstance()).getRenderable(imageLocation, onErrorType);
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(String, OnErrorTypeEnum, boolean)}.
	 */
	public static JRRenderable getInstance(String imageLocation, OnErrorTypeEnum onErrorType, boolean isLazy) throws JRException
	{
		return RenderableUtil.getInstance(DefaultJasperReportsContext.getInstance()).getRenderable(imageLocation, onErrorType, isLazy);
	}

	
	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(Image, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(Image img, OnErrorTypeEnum onErrorType) throws JRException
	{
		ImageTypeEnum type = ImageTypeEnum.JPEG;
		if (img instanceof RenderedImage)
		{
			ColorModel colorModel = ((RenderedImage) img).getColorModel();
			//if the image has transparency, encode as PNG
			if (colorModel.hasAlpha() 
					&& colorModel.getTransparency() != Transparency.OPAQUE)
			{
				type = ImageTypeEnum.PNG;
			}
		}
		
		return getInstance(img, type.getValue(), onErrorType);
	}


	/**
	 * Creates and returns an instance of the JRImageRenderer class after encoding the image object using an image
	 * encoder that supports the supplied image type.
	 * 
	 * @param image the java.awt.Image object to wrap into a JRImageRenderer instance
	 * @param imageType the type of the image as specified by one of the constants defined in the JRRenderable interface
	 * @param onErrorType one of the error type constants defined in the {@link OnErrorTypeEnum}.
	 * @return the image renderer instance
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(Image, ImageTypeEnum, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(Image image, byte imageType, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			return new JRImageRenderer(JRImageLoader.loadImageDataFromAWTImage(image, imageType));
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(InputStream, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(InputStream is, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			return new JRImageRenderer(JRLoader.loadBytes(is));
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(URL, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(URL url, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			return new JRImageRenderer(JRLoader.loadBytes(url));
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getRenderable(File, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getInstance(File file, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			return new JRImageRenderer(JRLoader.loadBytes(file));
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getOnErrorRendererForDimension(Renderable, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getOnErrorRendererForDimension(JRRenderable renderer, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			renderer.getDimension();
			return renderer;
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 * @deprecated Replaced by {@link RenderableUtil#getOnErrorRendererForImageData(Renderable, OnErrorTypeEnum)}.
	 */
	public static JRRenderable getOnErrorRendererForImageData(JRRenderable renderer, OnErrorTypeEnum onErrorType) throws JRException
	{
		try
		{
			renderer.getImageData();
			return renderer;
		}
		catch (JRException e)
		{
			return getOnErrorRenderer(onErrorType, e); 
		}
	}


	/**
	 *
	 */
	public static JRImageRenderer getOnErrorRendererForImage(JasperReportsContext jasperReportsContext, JRImageRenderer renderer, OnErrorTypeEnum onErrorType) throws JRException
	{
		JRImageRenderer result;
		try
		{
			renderer.getImage(jasperReportsContext);
			result = renderer;
		}
		catch (JRException e) //FIXME this duplicates RenderableUtil.handleImageError
		{
			result = getOnErrorRenderer(onErrorType, e);
			
			if (log.isDebugEnabled())
			{
				log.debug("handled image error with type " + onErrorType, e);
			}
		}
		catch (JRRuntimeException e)
		{
			result = getOnErrorRenderer(onErrorType, e); 
			
			if (log.isDebugEnabled())
			{
				log.debug("handled image error with type " + onErrorType, e);
			}
		}
		return result;
	}


	/**
	 * @deprecated Replaced by {@link #getOnErrorRendererForImage(JasperReportsContext, JRImageRenderer, OnErrorTypeEnum)}.
	 */
	public static JRImageRenderer getOnErrorRendererForImage(JRImageRenderer renderer, OnErrorTypeEnum onErrorType) throws JRException
	{
		return getOnErrorRendererForImage(DefaultJasperReportsContext.getInstance(), renderer, onErrorType);
	}


	/**
	 * 
	 */
	public static JRImageRenderer getOnErrorRenderer(OnErrorTypeEnum onErrorType, JRException e) throws JRException
	{
		JRImageRenderer renderer = null;
		
		switch (onErrorType)
		{
			case ICON :
			{
				renderer = new JRImageRenderer(JRImageLoader.NO_IMAGE_RESOURCE);
				//FIXME cache these renderers
				break;
			}
			case BLANK :
			{
				break;
			}
			case ERROR :
			default :
			{
				throw e;
			}
		}

		return renderer;
	}

	public static JRImageRenderer getOnErrorRenderer(OnErrorTypeEnum onErrorType, JRRuntimeException e) throws JRRuntimeException
	{
		JRImageRenderer renderer = null;
		
		switch (onErrorType)
		{
			case ICON :
			{
				renderer = new JRImageRenderer(JRImageLoader.NO_IMAGE_RESOURCE);
				//FIXME cache these renderers
				break;
			}
			case BLANK :
			{
				break;
			}
			case ERROR :
			default :
			{
				throw e;
			}
		}

		return renderer;
	}


	/**
	 *
	 */
	public Image getImage(JasperReportsContext jasperReportsContext) throws JRException
	{
		if (awtImageRef == null || awtImageRef.get() == null)
		{
			Image awtImage = JRImageLoader.getInstance(jasperReportsContext).loadAwtImageFromBytes(getImageData(jasperReportsContext));
			awtImageRef = new SoftReference<Image>(awtImage);
		}
		return awtImageRef.get();
	}


	/**
	 * @deprecated Replaced by {@link #getImage(JasperReportsContext)}.
	 */
	public Image getImage() throws JRException
	{
		return getImage(DefaultJasperReportsContext.getInstance());
	}


	/**
	 *
	 */
	public String getImageLocation()
	{
		return imageLocation;
	}


	/**
	 * @deprecated Replaced by {@link #getTypeValue()}.
	 */
	public byte getType()
	{
		return getTypeValue().getValue();
	}
	
	
	/**
	 * @deprecated Replaced by {@link #getImageTypeValue()}.
	 */
	public byte getImageType() 
	{
		return getImageTypeValue().getValue();
	}
	

	/**
	 *
	 */
	public RenderableTypeEnum getTypeValue()
	{
		return RenderableTypeEnum.IMAGE;
	}
	
	
	/**
	 *
	 */
	public ImageTypeEnum getImageTypeValue()
	{
		return imageTypeValue;
	}
	

	/**
	 * @deprecated Replaced by {@link #getDimension(JasperReportsContext)}.
	 */
	public Dimension2D getDimension() throws JRException
	{
		return getDimension(DefaultJasperReportsContext.getInstance());
	}


	/**
	 *
	 */
	public Dimension2D getDimension(JasperReportsContext jasperReportsContext) throws JRException
	{
		Image img = getImage(jasperReportsContext);
		return new Dimension(img.getWidth(null), img.getHeight(null));
	}


	@Override
	public byte[] getImageData(JasperReportsContext jasperReportsContext)
			throws JRException
	{
		if (imageData == null)
		{
			imageData = RepositoryUtil.getInstance(jasperReportsContext).getBytesFromLocation(imageLocation);
			
			if(imageData != null) 
			{
				imageTypeValue = JRTypeSniffer.getImageTypeValue(imageData);
			}
		}

		return imageData;
	}


	/**
	 * @deprecated Replaced by {@link #getImageData(JasperReportsContext)}.
	 */
	public byte[] getImageData() throws JRException
	{
		return getImageData(DefaultJasperReportsContext.getInstance());
	}


	/**
	 * @deprecated Replaced by {@link #render(JasperReportsContext, Graphics2D, Rectangle2D)}.
	 */
	public void render(Graphics2D grx, Rectangle2D rectangle) throws JRException
	{
		render(DefaultJasperReportsContext.getInstance(), grx, rectangle);
	}


	/**
	 *
	 */
	public void render(JasperReportsContext jasperReportsContext, Graphics2D grx, Rectangle2D rectangle) throws JRException
	{
		Image img = getImage(jasperReportsContext);

		grx.drawImage(
			img, 
			(int)rectangle.getX(), 
			(int)rectangle.getY(), 
			(int)rectangle.getWidth(), 
			(int)rectangle.getHeight(), 
			null
			);
	}

	
	/*
	 * These fields are only for serialization backward compatibility.
	 */
	private int PSEUDO_SERIAL_VERSION_UID = JRConstants.PSEUDO_SERIAL_VERSION_UID; //NOPMD
	/**
	 * @deprecated
	 */
	private byte imageType;
	
	private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
	{
		in.defaultReadObject();
		
		if (PSEUDO_SERIAL_VERSION_UID < JRConstants.PSEUDO_SERIAL_VERSION_UID_4_6_0)
		{
			imageTypeValue = ImageTypeEnum.getByValue(imageType);
		}
	}

}