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/*
 * Copyright (c) 2005-2019 Radiance Kirill Grouchnikov. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o 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. 
 *     
 *  o Neither the name of the copyright holder 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 THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS 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.pushingpixels.substance.api.painter.preview;

import org.pushingpixels.neon.NeonCortex;
import org.pushingpixels.substance.internal.utils.SubstanceCoreUtilities;

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;

/**
 * Default implementation of the component preview painter. The component preview is a scaled-down
 * (as necessary) thumbnail of the relevant component.
 * 
 * @author Kirill Grouchnikov
 */
public class DefaultPreviewPainter extends PreviewPainter {
    @Override
    public boolean hasPreview(Container parent, Component component, int componentIndex) {
        return (component != null);
    }

    @Override
    public void previewComponent(Container parent, Component component, int componentIndex,
            Graphics g, int x, int y, int w, int h) {
        if (component == null)
            return;
        int compWidth = component.getWidth();
        int compHeight = component.getHeight();

        if ((compWidth > 0) && (compHeight > 0)) {
            // draw component
            BufferedImage tempCanvas = SubstanceCoreUtilities.getBlankImage(compWidth, compHeight);
            Graphics tempCanvasGraphics = tempCanvas.getGraphics();
            component.paint(tempCanvasGraphics);

            double scaleFactor = NeonCortex.getScaleFactor();
            // check if need to scale down
            double coef = Math.min((double) w / (double) compWidth,
                    (double) h / (double) compHeight) / scaleFactor;
            if (coef < 1.0) {
                int sdWidth = (int) (coef * compWidth);
                int sdHeight = (int) (coef * compHeight);
                int dx = x + ((int) (w / scaleFactor) - sdWidth) / 2;
                int dy = y + ((int) (h / scaleFactor) - sdHeight) / 2;

                BufferedImage thumbnail = NeonCortex.createThumbnail(tempCanvas, sdWidth);
                g.drawImage(thumbnail, dx, dy, (int) (thumbnail.getWidth() / scaleFactor),
                        (int) (thumbnail.getHeight() / scaleFactor), null);
            } else {
                g.drawImage(tempCanvas, x, y, null);
            }
        }
    }

    @Override
    public boolean hasPreviewWindow(Container parent, Component component, int componentIndex) {
        return true;
    }

    @Override
    public Dimension getPreviewWindowDimension(Container parent, Component component,
            int componentIndex) {
        Dimension superResult = super.getPreviewWindowDimension(parent, component, componentIndex);
        if (parent instanceof JViewport) {
            Rectangle viewportRect = ((JViewport) parent).getViewRect();
            int width = Math.min(viewportRect.width / 3, superResult.width);
            int height = Math.min(viewportRect.height / 3, superResult.height);
            return new Dimension(width, height);
        }
        return superResult;
    }
}