/*
 * #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
 * %%
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 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    and/or other materials provided with the distribution.
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package org.scijava.ops.image.features.haralick.helper;

import java.util.function.Function;

import net.imglib2.type.numeric.real.DoubleType;

import org.scijava.ops.spi.OpDependency;

/**
 * NB: Helper class. Internal usage only.
 *
 * @author Andreas Graumann (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @implNote op names='features.haralick.coocMeanY'
 */
public class CoocMeanY implements Function<double[][], DoubleType> {

	@OpDependency(name = "features.haralick.coocPY")
	private Function<double[][], double[]> coocPYFunc;

	/**
	 * TODO
	 *
	 * @param input
	 * @return the output
	 */
	@Override
	public DoubleType apply(double[][] input) {

		double res = 0;
		final var py = coocPYFunc.apply(input);
		for (var i = 0; i < py.length; i++) {
			res += i * py[i];
		}
		return new DoubleType(res);
	}

}
