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package org.scijava.ops.image.transform.collapseNumericView;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.function.BiFunction;
import java.util.function.Function;

import org.scijava.ops.image.AbstractOpTest;
import net.imglib2.RandomAccessible;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.img.Img;
import net.imglib2.img.array.ArrayImgFactory;
import net.imglib2.type.numeric.NativeARGBDoubleType;
import net.imglib2.view.Views;
import net.imglib2.view.composite.CompositeIntervalView;
import net.imglib2.view.composite.CompositeView;
import net.imglib2.view.composite.NumericComposite;

import org.junit.jupiter.api.Test;
import org.scijava.ops.api.OpBuilder;
import org.scijava.types.Nil;

/**
 * Tests {@link org.scijava.ops.image.Ops.Transform.CollapseNumericView} ops.
 * <p>
 * This test only checks if the op call works with all parameters and that the
 * result is equal to that of the {@link Views} method call. It is not a
 * correctness test of {@link Views} itself.
 * </p>
 *
 * @author Tim-Oliver Buchholz (University of Konstanz)
 */
public class CollapseNumericViewTest extends AbstractOpTest {

	private static
		CompositeIntervalView<NativeARGBDoubleType, ? extends NumericComposite<NativeARGBDoubleType>>
		foo()
	{
		return null;
	}

	@Test
	public void testDefaultCollapseNumeric() {
		Img<NativeARGBDoubleType> img = new ArrayImgFactory<>(
			new NativeARGBDoubleType()).create(new int[] { 10, 10 });

		Function<Img<NativeARGBDoubleType>, CompositeIntervalView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>>> collapseFunc =
			ops.op("transform.collapseNumericView").input(img).outType(
				new Nil<CompositeIntervalView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>>>()
				{}).function();

		CompositeIntervalView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>> il2 =
			Views.collapseNumeric(
				(RandomAccessibleInterval<NativeARGBDoubleType>) img);
		CompositeIntervalView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>> opr =
			collapseFunc.apply(img);

		assertEquals(il2.numDimensions(), opr.numDimensions());

		BiFunction<RandomAccessible<NativeARGBDoubleType>, Integer, CompositeView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>>> collapseFuncRA =
			OpBuilder.matchFunction(ops, "transform.collapseNumericView",
				new Nil<RandomAccessible<NativeARGBDoubleType>>()
				{}, new Nil<Integer>() {},
				new Nil<CompositeView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>>>()
				{});

		CompositeView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>> il2_2 =
			Views.collapseNumeric((RandomAccessible<NativeARGBDoubleType>) img, 1);
		CompositeView<NativeARGBDoubleType, NumericComposite<NativeARGBDoubleType>> opr_2 =
			collapseFuncRA.apply(img, 1);

		assertEquals(il2_2.numDimensions(), opr_2.numDimensions());
	}
}
