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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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 *    and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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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.huMoment5}.
 *
 * @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.huMoment5', label='Image Moment: HuMoment5'
 */
public class DefaultHuMoment5, 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)(n30 + n12)[(n30 + n12)^2 - 3*(n21 + n03)^2]
		// term11 = (n30 - 3*n12)
		final O term11 = n30.copy();
		output.set(n12);
		output.mul(3d);
		term11.sub(output);
		// term12 = (n30 + n12)
		final O term12 = n30.copy();
		term12.add(n12);
		// term13 = [(n30 + n12)^2 - 3*(n21 + n03)^2]
		final O term13 = term12.copy();
		term13.mul(term12);
		output.set(n21);
		output.add(n03);
		output.mul(output);
		output.mul(3);
		term13.sub(output);

		final O term1 = term11.copy();
		term1.mul(term12);
		term1.mul(term13);

		// term2 = (3*n21 - n03)(n21 + n03)[3*(n30 + n12)^2 - (n21 + n03)^2]
		// term21 = (3*n21 - n03)
		final O term21 = n21.copy();
		term21.mul(3);
		term21.sub(n03);
		// term22 = (n21 + n03)
		final O term22 = n21.copy();
		term22.add(n03);
		// term23 = [3*(n30 + n12)^2 - (n21 + n03)^2] = [3*(term12^2) - term22^2]
		final O term23 = term12.copy();
		term23.mul(term12);
		term23.mul(3);
		output.set(term22);
		output.mul(term22);
		term23.sub(output);

		final O term2 = term21.copy();
		term2.mul(term22);
		term2.mul(term23);

		output.set(term1);
		output.add(term2);

	}
}