/*
 * #%L
 * Java implementation of the SciJava Ops matching engine.
 * %%
 * Copyright (C) 2016 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * 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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 *    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
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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package org.scijava.ops.engine.util;

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

import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.scijava.ops.api.OpBuilder;
import org.scijava.ops.engine.AbstractTestEnvironment;
import org.scijava.ops.engine.math.Add;
import org.scijava.ops.engine.math.Power;
import org.scijava.ops.engine.math.Sqrt;
import org.scijava.types.Nil;

public class FunctionsTest extends AbstractTestEnvironment {

	@BeforeAll
	public static void addNeededOps() {
		ops.register(new Sqrt());
		ops.register(new Add());
		ops.register(new Power());
	}

	private static Nil<Double> nilDouble = new Nil<>() {};

	@Test
	public void testUnaryFunctions() {
		Function<Double, Double> sqrtFunction = OpBuilder.matchFunction(ops,
			"math.sqrt", nilDouble, nilDouble);
		double answer = sqrtFunction.apply(16.0);
		assert 4.0 == answer;
	}

	@Test
	public void testBinaryFunctions() {
		BiFunction<Double, Double, Double> addFunction = OpBuilder.matchFunction(
			ops, "math.add", nilDouble, nilDouble, nilDouble);
		double answer = addFunction.apply(16.0, 14.0);
		assert 30.0 == answer;

		BiFunction<Double, Double, Double> powerFunction = OpBuilder.matchFunction(
			ops, "math.pow", nilDouble, nilDouble, nilDouble);
		answer = powerFunction.apply(2.0, 10.0);
		assert 1024.0 == answer;
	}
}
