/* #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
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 * 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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package org.scijava.ops.image.create;

import java.util.function.BiFunction;

import net.imglib2.Cursor;
import net.imglib2.Dimensions;
import net.imglib2.FinalInterval;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.img.Img;
import net.imglib2.type.Type;
import net.imglib2.type.numeric.ComplexType;
import net.imglib2.view.Views;

/**
 * Creates a separated sobel kernel.
 *
 * @author Eike Heinz, University of Konstanz
 */

public final class DefaultCreateKernelSobel {

	private DefaultCreateKernelSobel() {
		// Prevent instantiation of static utility class
	}

	private static final float[] values = { 1.0f, 2.0f, 1.0f, -1.0f, 0.0f, 1.0f };

	public static <T extends Type<T>, C extends ComplexType<C>>
		RandomAccessibleInterval<C> createKernel(C type,
			BiFunction<Dimensions, T, Img<T>> createFunc)
	{
        var dim = new long[4];

		dim[0] = 3;
		dim[1] = 1;

		for (var k = 2; k < dim.length; k++) {
			dim[k] = 1;
		}

		dim[dim.length - 1] = 2;

        var output =
			(RandomAccessibleInterval<C>) createFunc.apply(new FinalInterval(dim),
				(T) type);
		final var cursor = Views.iterable(output).cursor();
        var i = 0;
		while (cursor.hasNext()) {
			cursor.fwd();
			cursor.get().setReal(values[i]);
			i++;
		}

		return output;
	}

}
