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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:
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 *    this list of conditions and the following disclaimer.
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 *    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
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package org.scijava.ops.image.imagemoments.hu;

import org.scijava.ops.image.imagemoments.AbstractImageMomentOp;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.type.numeric.RealType;

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

/**
 * Op to calculate the {@code imageMoments.huMoment3}.
 *
 * @author Daniel Seebacher (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @param  input type
 * @param  output type
 * @see  This
 *      page 
 * @implNote op names='imageMoments.huMoment3', label='Image Moment: HuMoment3'
 */
public class DefaultHuMoment3, O extends RealType>
	implements AbstractImageMomentOp
{

	@OpDependency(name = "imageMoments.normalizedCentralMoment30")
	private Computers.Arity1, O> normalizedCentralMoment30Func;

	@OpDependency(name = "imageMoments.normalizedCentralMoment12")
	private Computers.Arity1, O> normalizedCentralMoment12Func;

	@OpDependency(name = "imageMoments.normalizedCentralMoment21")
	private Computers.Arity1, O> normalizedCentralMoment21Func;

	@OpDependency(name = "imageMoments.normalizedCentralMoment03")
	private Computers.Arity1, O> normalizedCentralMoment03Func;

	/**
	 * TODO
	 *
	 * @param input
	 * @param output
	 */
	@Override
	public void computeMoment(final RandomAccessibleInterval input,
		final O output)
	{

		final O n30 = output.createVariable();
		normalizedCentralMoment30Func.compute(input, n30);
		final O n12 = output.createVariable();
		normalizedCentralMoment12Func.compute(input, n12);
		final O n21 = output.createVariable();
		normalizedCentralMoment21Func.compute(input, n21);
		final O n03 = output.createVariable();
		normalizedCentralMoment03Func.compute(input, n03);

		// term1 = (n30 - (3 * n12))^2
		final O term1 = n30.copy();
		output.set(n12);
		output.mul(3);
		term1.sub(output);
		term1.mul(term1);

		// term2 = ((3 * n21) - n03)^2
		final O term2 = n21.copy();
		output.setReal(3d);
		term2.mul(output);
		term2.sub(n03);
		term2.mul(term2);

		output.set(term1);
		output.add(term2);
//		output.setReal(Math.pow(n30.getRealDouble() - 3 * n12.getRealDouble(), 2)
//				+ Math.pow(3 * n21.getRealDouble() - n03.getRealDouble(), 2));
	}
}