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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
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * 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.stats;

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 stats.geometricMean} using {@code stats.size} and
 * {@code stats.sumOfLogs}.
 *
 * @author Daniel Seebacher (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @param  input type
 * @param  output type
 * @implNote op names='stats.geometricMean'
 */
public class DefaultGeometricMean, O extends RealType>
	implements Computers.Arity1, O>
{

	@OpDependency(name = "stats.size")
	private Computers.Arity1, O> sizeComputer;

	@OpDependency(name = "stats.sumOfLogs")
	private Computers.Arity1, O> sumOfLogsComputer;

	/**
	 * TODO
	 *
	 * @param input
	 * @param geometricMean
	 */
	@Override
	public void compute(final RandomAccessibleInterval input,
		final O geometricMean)
	{
		final O size = geometricMean.createVariable();
		sizeComputer.compute(input, size);
		final O sumOfLogs = geometricMean.createVariable();
		sumOfLogsComputer.compute(input, sumOfLogs);

		if (size.getRealDouble() != 0) {
			geometricMean.setReal(Math.exp(sumOfLogs.getRealDouble() / size
				.getRealDouble()));
		}
		else {
			geometricMean.setReal(0);
		}

	}
}