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/*
 * #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 
 * 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 HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * 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
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package org.scijava.ops.image.imagemoments.centralmoments;

import net.imglib2.Cursor;
import net.imglib2.IterableInterval;
import net.imglib2.type.numeric.RealType;

import org.scijava.function.Computers;
import org.scijava.ops.spi.Op;

/**
 * Op to calculate the {@code imageMoments.centralMoment11} directly.
 *
 * @author Daniel Seebacher (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @param  input type
 * @param  output type
 * @implNote op names='imageMoments.centralMoment11', label='Image Moment:
 *           CentralMoment11', priority='10000.'
 */
public class IterableCentralMoment11, O extends RealType>
	implements Computers.Arity1, O>
{

	/**
	 * TODO
	 *
	 * @param input
	 * @param output
	 */
	@Override
	public void compute(final IterableInterval input, final O output) {
		if (input.numDimensions() != 2) throw new IllegalArgumentException(
			"Only two-dimensional inputs allowed!");

		double moment00 = 0d;
		double moment01 = 0d;
		double moment10 = 0d;
		double moment11 = 0d;

		final Cursor cursor = input.localizingCursor();
		while (cursor.hasNext()) {
			cursor.fwd();
			final double x = cursor.getDoublePosition(0);
			final double y = cursor.getDoublePosition(1);
			final double val = cursor.get().getRealDouble();

			moment00 += val;
			moment01 += y * val;
			moment10 += x * val;
			moment11 += x * y * val;
		}

		double centerx = moment10 / moment00;
		output.setReal(moment11 - (centerx * moment01));
	}
}