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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: ImageRenderedAdapter.java 1856423 2019-03-27 16:06:24Z ssteiner $ */

package org.apache.fop.render.pdf;
import java.awt.Color;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.io.OutputStream;

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

import org.apache.xmlgraphics.image.loader.impl.ImageRendered;
import org.apache.xmlgraphics.ps.ImageEncodingHelper;

import org.apache.fop.pdf.AlphaRasterImage;
import org.apache.fop.pdf.PDFColor;
import org.apache.fop.pdf.PDFDeviceColorSpace;
import org.apache.fop.pdf.PDFDictionary;
import org.apache.fop.pdf.PDFDocument;
import org.apache.fop.pdf.PDFFilter;
import org.apache.fop.pdf.PDFFilterList;
import org.apache.fop.pdf.PDFReference;

/**
 * PDFImage implementation for the PDF renderer which handles RenderedImages.
 */
public class ImageRenderedAdapter extends AbstractImageAdapter {

    /** logging instance */
    private static Log log = LogFactory.getLog(ImageRenderedAdapter.class);

    private ImageEncodingHelper encodingHelper;

    private PDFFilter pdfFilter;
    private String maskRef;
    private PDFReference softMask;

    /**
     * Creates a new PDFImage from an Image instance.
     * @param image the image
     * @param key XObject key
     */
    public ImageRenderedAdapter(ImageRendered image, String key) {
        super(image, key);
        this.encodingHelper = new ImageEncodingHelper(image.getRenderedImage());
    }

    /**
     * Returns the ImageRendered instance for this adapter.
     * @return the ImageRendered instance
     */
    public ImageRendered getImage() {
        return ((ImageRendered)this.image);
    }

    /** {@inheritDoc} */
    @Override
    public int getWidth() {
        RenderedImage ri = getImage().getRenderedImage();
        return ri.getWidth();
    }

    /** {@inheritDoc} */
    @Override
    public int getHeight() {
        RenderedImage ri = getImage().getRenderedImage();
        return ri.getHeight();
    }

    private ColorModel getEffectiveColorModel() {
        return encodingHelper.getEncodedColorModel();
    }

    /** {@inheritDoc} */
    @Override
    protected ColorSpace getImageColorSpace() {
        return getEffectiveColorModel().getColorSpace();
    }

    /** {@inheritDoc} */
    @Override
    protected ICC_Profile getEffectiveICCProfile() {
        ColorSpace cs = getImageColorSpace();
        if (cs instanceof ICC_ColorSpace) {
            ICC_ColorSpace iccSpace = (ICC_ColorSpace)cs;
            return iccSpace.getProfile();
        } else {
            return null;
        }
    }

    /** {@inheritDoc} */
    @Override
    public void setup(PDFDocument doc) {
        RenderedImage ri = getImage().getRenderedImage();

        super.setup(doc);

        //Handle transparency mask if applicable
        ColorModel orgcm = ri.getColorModel();
        if (orgcm.hasAlpha() && orgcm.getTransparency() == ColorModel.TRANSLUCENT) {
            doc.getProfile().verifyTransparencyAllowed(image.getInfo().getOriginalURI());
            //TODO Implement code to combine image with background color if transparency is not
            //allowed (need BufferedImage support for that)

            AlphaRasterImage alphaImage = new AlphaRasterImage("Mask:" + getKey(), ri);
            this.softMask = doc.addImage(null, alphaImage).makeReference();
        }
    }

    /** {@inheritDoc} */
    public PDFDeviceColorSpace getColorSpace() {
        // DeviceGray, DeviceRGB, or DeviceCMYK
        return toPDFColorSpace(getEffectiveColorModel().getColorSpace());
    }

    /** {@inheritDoc} */
    public int getBitsPerComponent() {
        ColorModel cm = getEffectiveColorModel();
        if (cm instanceof IndexColorModel) {
            IndexColorModel icm = (IndexColorModel)cm;
            return icm.getComponentSize(0);
        } else {
            return cm.getComponentSize(0);
        }
    }

    /** {@inheritDoc} */
    @Override
    public boolean isTransparent() {
        return (getImage().getTransparentColor() != null);
    }

    /** {@inheritDoc} */
    @Override
    public PDFColor getTransparentColor() {
        ColorModel cm = getEffectiveColorModel();
        if (cm instanceof IndexColorModel) {
            IndexColorModel icm = (IndexColorModel)cm;
            if (cm.getTransparency() == IndexColorModel.TRANSLUCENT
                    || cm.getTransparency() == IndexColorModel.BITMASK) {
                int transPixel = icm.getTransparentPixel();
                if (transPixel != -1) {
                    return new PDFColor(
                            icm.getRed(transPixel),
                            icm.getGreen(transPixel),
                            icm.getBlue(transPixel));
                }
            }
        }
        Color transColor = getImage().getTransparentColor();
        if (transColor != null) {
            return new PDFColor(transColor);
        } else {
            return null;
        }
    }

    /** {@inheritDoc} */
    @Override
    public String getMask() {
        return maskRef;
    }

    /** {@inheritDoc} */
    @Override
    public PDFReference getSoftMaskReference() {
        return softMask;
    }

    /** {@inheritDoc} */
    public PDFFilter getPDFFilter() {
        return pdfFilter;
    }

    /** {@inheritDoc} */
    public void outputContents(OutputStream out) throws IOException {
        long start = System.currentTimeMillis();
        encodingHelper.setBWInvert(true);
        encodingHelper.encode(out);
        long duration = System.currentTimeMillis() - start;
        if (log.isDebugEnabled()) {
            log.debug("Image encoding took " + duration + "ms");
        }
    }

    /** {@inheritDoc} */
    @Override
    public void populateXObjectDictionary(PDFDictionary dict) {
        ColorModel cm = getEffectiveColorModel();
        if (cm instanceof IndexColorModel) {
            IndexColorModel icm = (IndexColorModel) cm;
            super.populateXObjectDictionaryForIndexColorModel(dict, icm);
        }
    }

    /** {@inheritDoc} */
    public String getFilterHint() {
        return PDFFilterList.IMAGE_FILTER;
    }

}