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

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

import java.util.function.BiFunction;

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.img.array.ArrayImgs;
import net.imglib2.type.numeric.real.DoubleType;
import net.imglib2.util.Intervals;
import net.imglib2.view.IntervalView;
import net.imglib2.view.MixedTransformView;
import net.imglib2.view.Views;

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.TranslateView} 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)
 * @author Gabriel Selzer
 */
public class TranslateViewTest extends AbstractOpTest {

	// TODO remove from this and other transform tests
	public static <T> RandomAccessible<T> deinterval(
		RandomAccessibleInterval<T> input)
	{
		return Views.extendBorder(input);
	}

	@Test
	public void testDefaultTranslate() {
		BiFunction<Img<DoubleType>, long[], MixedTransformView<DoubleType>> translateFunc =
			OpBuilder.matchFunction(ops, "transform.translateView",
				new Nil<Img<DoubleType>>()
				{}, new Nil<long[]>() {}, new Nil<MixedTransformView<DoubleType>>() {});

		Img<DoubleType> img = new ArrayImgFactory<>(new DoubleType()).create(
			new int[] { 10, 10 });

		MixedTransformView<DoubleType> il2 = Views.translate(deinterval(img), 2, 5);
		MixedTransformView<DoubleType> opr = translateFunc.apply(img, new long[] {
			2, 5 });

		for (int i = 0; i < il2.getTransformToSource().getMatrix().length; i++) {
			for (int j = 0; j < il2.getTransformToSource()
				.getMatrix()[i].length; j++)
			{
				assertEquals(il2.getTransformToSource().getMatrix()[i][j], opr
					.getTransformToSource().getMatrix()[i][j], 1e-10);
			}
		}
	}

	@Test
	public void testIntervalTranslate() {
		BiFunction<Img<DoubleType>, long[], IntervalView<DoubleType>> translateFunc =
			OpBuilder.matchFunction(ops, "transform.translateView",
				new Nil<Img<DoubleType>>()
				{}, new Nil<long[]>() {}, new Nil<IntervalView<DoubleType>>() {});

		Img<DoubleType> img = ArrayImgs.doubles(10, 10);

		IntervalView<DoubleType> expected = Views.translate(img, 2, 5);
		IntervalView<DoubleType> actual = translateFunc.apply(img, new long[] { 2,
			5 });

		for (int i = 0; i < ((MixedTransformView<DoubleType>) expected.getSource())
			.getTransformToSource().getMatrix().length; i++)
		{
			for (int j = 0; j < ((MixedTransformView<DoubleType>) expected
				.getSource()).getTransformToSource().getMatrix()[i].length; j++)
			{
				assertEquals(((MixedTransformView<DoubleType>) expected.getSource())
					.getTransformToSource().getMatrix()[i][j],
					((MixedTransformView<DoubleType>) actual.getSource())
						.getTransformToSource().getMatrix()[i][j], 1e-10);
			}
		}

		assertTrue(Intervals.equals(expected, actual));
	}
}
