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/*
 * Copyright (c) 2009-2021 jMonkeyEngine
 * 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 'jMonkeyEngine' 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
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 */
package jme3tools.converters;

import com.jme3.math.FastMath;
import com.jme3.texture.Image;
import com.jme3.texture.Image.Format;
import com.jme3.texture.plugins.AWTLoader;
import com.jme3.util.BufferUtils;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.nio.ByteBuffer;
import java.util.ArrayList;

public class MipMapGenerator {

    /**
     * A private constructor to inhibit instantiation of this class.
     */
    private MipMapGenerator() {
    }

    private static BufferedImage scaleDown(BufferedImage sourceImage, int targetWidth, int targetHeight) {
        int sourceWidth  = sourceImage.getWidth();
        int sourceHeight = sourceImage.getHeight();

        BufferedImage targetImage = new BufferedImage(targetWidth, targetHeight, sourceImage.getType());

        Graphics2D g = targetImage.createGraphics();
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g.drawImage(sourceImage, 0, 0, targetWidth, targetHeight, 0, 0, sourceWidth, sourceHeight, null);
        g.dispose();

        return targetImage;
    }

    public static void resizeToPowerOf2(Image image){
        BufferedImage original = ImageToAwt.convert(image, false, true, 0);
        int potWidth = FastMath.nearestPowerOfTwo(image.getWidth());
        int potHeight = FastMath.nearestPowerOfTwo(image.getHeight());
        int potSize = Math.max(potWidth, potHeight);

        BufferedImage scaled = scaleDown(original, potSize, potSize);

        AWTLoader loader = new AWTLoader();
        Image output = loader.load(scaled, false);

        image.setWidth(potSize);
        image.setHeight(potSize);
        image.setDepth(0);
        image.setData(output.getData(0));
        image.setFormat(output.getFormat());
        image.setMipMapSizes(null);
    }

    public static void generateMipMaps(Image image){
        BufferedImage original = ImageToAwt.convert(image, false, true, 0);
        int width = original.getWidth();
        int height = original.getHeight();
        int level = 0;

        BufferedImage current = original;
        AWTLoader loader = new AWTLoader();
        ArrayList output = new ArrayList<>();
        int totalSize = 0;
        Format format = null;
        
        while (height >= 1 || width >= 1){
            Image converted = loader.load(current, false);
            format = converted.getFormat();
            output.add(converted.getData(0));
            totalSize += converted.getData(0).capacity();

            if(height == 1 || width == 1) {
              break;
            }

            level++;

            height /= 2;
            width /= 2;

            current = scaleDown(current, width, height);
        }

        ByteBuffer combinedData = BufferUtils.createByteBuffer(totalSize);
        int[] mipSizes = new int[output.size()];
        for (int i = 0; i < output.size(); i++){
            ByteBuffer data = output.get(i);
            data.clear();
            combinedData.put(data);
            mipSizes[i] = data.capacity();
        }
        combinedData.flip();

        // insert mip data into image
        image.setData(0, combinedData);
        image.setMipMapSizes(mipSizes);
        image.setFormat(format);
    }

}