/*
 * 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.
 */

/* $Id$ */

package org.apache.fop.render.ps;

import java.awt.Dimension;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;

import org.apache.xmlgraphics.java2d.GeneralGraphics2DImagePainter;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;
import org.apache.xmlgraphics.java2d.ps.PSGraphics2D;
import org.apache.xmlgraphics.ps.PSGenerator;

import org.apache.fop.fonts.FontInfo;
import org.apache.fop.pdf.PDFFactory;
import org.apache.fop.render.AbstractGraphics2DAdapter;
import org.apache.fop.render.ImageHandlerUtil;
import org.apache.fop.render.RendererContext;
import org.apache.fop.render.RendererContext.RendererContextWrapper;
import org.apache.fop.render.RendererContextConstants;

/**
 * Graphics2DAdapter implementation for PostScript.
 */
public class PSGraphics2DAdapter extends AbstractGraphics2DAdapter {

    private PSGenerator gen;
    private boolean clip = true;
    private FontInfo fontInfo;

    /**
     * Creates a new instance.
     * @param gen the PostScript generator
     * @param clip true if the image should be clipped
     */
    public PSGraphics2DAdapter(PSGenerator gen, boolean clip, FontInfo fontInfo) {
        this.gen = gen;
        this.clip = clip;
        this.fontInfo = fontInfo;
    }

    /** {@inheritDoc} */
    public void paintImage(Graphics2DImagePainter painter,
            RendererContext context,
            int x, int y, int width, int height) throws IOException {
        float fwidth = width / 1000f;
        float fheight = height / 1000f;
        float fx = x / 1000f;
        float fy = y / 1000f;

        // get the 'width' and 'height' attributes of the SVG document
        Dimension dim = painter.getImageSize();
        float imw = (float)dim.getWidth() / 1000f;
        float imh = (float)dim.getHeight() / 1000f;

        boolean paintAsBitmap = false;
        if (context != null) {
            Map foreign = (Map)context.getProperty(RendererContextConstants.FOREIGN_ATTRIBUTES);
            paintAsBitmap = (foreign != null
                   && ImageHandlerUtil.isConversionModeBitmap(foreign));
        }

        float sx = paintAsBitmap ? 1.0f : (fwidth / imw);
        float sy = paintAsBitmap ? 1.0f : (fheight / imh);

        gen.commentln("%FOPBeginGraphics2D");
        gen.saveGraphicsState();
        if (clip) {
            // Clip to the image area.
            gen.writeln("newpath");
            gen.defineRect(fx, fy, fwidth, fheight);
            gen.writeln("clip");
        }

        // transform so that the coordinates (0,0) is from the top left
        // and positive is down and to the right. (0,0) is where the
        // viewBox puts it.
        gen.concatMatrix(sx, 0, 0, sy, fx, fy);

        final boolean textAsShapes = false;
        PSGraphics2D graphics = (painter instanceof GeneralGraphics2DImagePainter)
                ? (PSGraphics2D) ((GeneralGraphics2DImagePainter) painter).getGraphics(textAsShapes, gen)
                : new PSGraphics2D(textAsShapes, gen);
        graphics.setGraphicContext(new org.apache.xmlgraphics.java2d.GraphicContext());
        AffineTransform transform = new AffineTransform();
        // scale to viewbox
        transform.translate(fx, fy);
        gen.getCurrentState().concatMatrix(transform);
        try {
            if (paintAsBitmap) {
                //Fallback solution: Paint to a BufferedImage
                int resolution = Math.round(context.getUserAgent().getTargetResolution());
                RendererContextWrapper ctx = RendererContext.wrapRendererContext(context);
                BufferedImage bi = paintToBufferedImage(painter, ctx, resolution, false, false);

                float scale = PDFFactory.DEFAULT_PDF_RESOLUTION
                        / context.getUserAgent().getTargetResolution();
                graphics.drawImage(bi, new AffineTransform(scale, 0, 0, scale, 0, 0), null);
            } else {
                if (painter instanceof GeneralGraphics2DImagePainter) {
                    PSFontUtils.addFallbackFonts(fontInfo, (GeneralGraphics2DImagePainter) painter);
                }
                Rectangle2D area = new Rectangle2D.Double(0.0, 0.0, imw, imh);
                painter.paint(graphics, area);
            }
        } finally {
            gen.restoreGraphicsState();
            gen.commentln("%FOPEndGraphics2D");
        }
    }

}
