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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * ThreeComponentImage.java
 * ---------------
 */

package org.jpedal.parser.image;

import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.util.Arrays;

import org.jpedal.io.ColorSpaceConvertor;
import org.jpedal.utils.LogWriter;

/**
 * @author markee
 */
class ThreeComponentImage {


    public static BufferedImage make(int d, byte[] data, final byte[] index, final int w, final int h) {

        final BufferedImage image;

        //some odd files with 16 bit need to be down-sampled to work with 8 bit (fogbugz 15839)
        // baseline_screens/14jan/fatt18SKYspeseOND13.pdf
        if (d == 16) {
            final int origSize = data.length;
            final int newSize = origSize / 2;

            final byte[] newData = new byte[newSize];

            for (int ptr = 0; ptr < newSize; ptr++) {
                newData[ptr] = data[ptr * 2];
            }
            data = newData;

            d = 8;

        }

        LogWriter.writeLog("Converting 3 comp colorspace to sRGB index=" + Arrays.toString(index));

        //work out from size what sort of image data we have
        if (w * h == data.length) {
            image = makeIndexImage(d, index, w, h, data);
        } else {

            LogWriter.writeLog("Converting data to sRGB " + data.length + " depth=" + d);

            image = makeImage(d, data, w, h);

        }
        return image;
    }

    static BufferedImage makeImage(final int d, byte[] data, final int w, final int h) {

        //expand out 4 bit raster as does not appear to be easy way
        if (d == 4) {
            data = expand4bitData(data, w, h);
        }

        final BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        data = checkSize(data, w, h, 3);
        final Raster raster = ColorSpaceConvertor.createInterleavedRaster(data, w, h);
        image.setData(raster);

        return image;
    }

    static byte[] expand4bitData(byte[] data, final int w, final int h) {

        final int origSize = data.length;
        final int newSize = w * h * 3;
        final boolean isOdd = (w & 1) == 1;
        final int scanLine = ((w * 3) + 1) >> 1;
        final byte[] newData = new byte[newSize];
        byte rawByte;
        int ptr = 0, currentLine = 0;

        for (int ii = 0; ii < origSize; ii++) {
            rawByte = data[ii];

            currentLine++;
            newData[ptr] = (byte) (rawByte & 240);
            if (newData[ptr] == -16) {   //fix for white
                newData[ptr] = (byte) 255;
            }
            ptr++;

            if ((currentLine) == scanLine && isOdd) { //ignore pack bit at end of odd line
                currentLine = 0;
            } else {
                newData[ptr] = (byte) ((rawByte & 15) << 4);
                if (newData[ptr] == -16)  //fix for white
                {
                    newData[ptr] = (byte) 255;
                }

                ptr++;
            }

            if (ptr == newSize) {
                ii = origSize;
            }
        }

        data = newData;

        return data;
    }

    static BufferedImage makeIndexImage(final int d, final byte[] index, final int w, final int h, final byte[] data) {

        final BufferedImage image;

        if (d == 8 && index != null) {
            image = ColorSpaceConvertor.convertIndexedToFlat(d, w, h, data, index, false, false);
        } else {

            final DataBuffer db = new DataBufferByte(data, data.length);

            final int[] bands = {0};

            image = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_GRAY);
            final Raster raster = Raster.createInterleavedRaster(db, w, h, w, 1, bands, null);
            image.setData(raster);

        }
        return image;
    }

    private static byte[] checkSize(byte[] data, final int w, final int h, final int comp) {

        final int correctSize = w * h * comp;
        if (data.length < correctSize) {
            final byte[] newData = new byte[correctSize];
            System.arraycopy(data, 0, newData, 0, data.length);
            data = newData;
        }

        return data;
    }

}