/*
 * Copyright (c) 2012-2018, Peter Abeles. All Rights Reserved.
 *
 * This file is part of DDogleg (http://ddogleg.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ddogleg.optimization;

import org.junit.jupiter.api.Test;

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

public abstract class CommonChecksUnconstrainedOptimization extends UnconstrainedMinimizationEvaluator {
	protected boolean checkFastConvergence = true;

	protected CommonChecksUnconstrainedOptimization() {
		super(false, false);
	}

	@Test
	public void checkPowell() {
		NonlinearResults results = powell();

		// no algorithm to compare it against, just do some sanity checks for changes
		if( checkFastConvergence ) {
			assertTrue(results.numFunction < 300);
			assertTrue(results.numGradient < 300);
		}

		// The function is degenerate, this test sees if it converges to a solution and improves
		// the parameter values.  It isn't very precise
//		assertEquals(0,results.x[0],1e-4);
//		assertEquals(0,results.x[1],1e-4);
		assertEquals(0, results.f, 1e-4);
	}

	@Test
	public void checkHelicalValley() {
		NonlinearResults results = helicalValley();

		// no algorithm to compare it against, just do some sanity checks for changes
		if( checkFastConvergence ) {
			assertTrue(results.numFunction < 100);
			assertTrue(results.numGradient < 100);
		}
		assertEquals(1, results.x[0], 1e-4);
		assertEquals(0, results.x[1], 1e-4);
		assertEquals(0, results.x[2], 1e-4);
		assertEquals(0, results.f, 1e-4);
	}

	@Test
	public void checkRosenbrock() {
		NonlinearResults results = rosenbrock();

		// no algorithm to compare it against, just do some sanity checks for changes
		if( checkFastConvergence ) {
			assertTrue(results.numFunction < 100);
			assertTrue(results.numGradient < 100);
		}
		assertEquals(1, results.x[0], 1e-4);
		assertEquals(1, results.x[1], 1e-4);
		assertEquals(0, results.f, 1e-4);
	}

	@Test
	public void checkBadlyScaledBrown() {
		NonlinearResults results = badlyScaledBrown();

		// no algorithm to compare it against, just do some sanity checks for changes
		if( checkFastConvergence ) {
			assertTrue(results.numFunction < 100);
			assertTrue(results.numGradient < 100);
		}
		assertEquals(1e6, results.x[0], results.x[0]*1e-4);
		assertEquals(2e-6, results.x[1], 1e-4);
		assertEquals(0, results.f, 1e-4);
	}

	@Test
	public void checkTrigonometric() {
		NonlinearResults results = trigonometric();

		// no algorithm to compare it against, just do some sanity checks for changes
		if( checkFastConvergence ) {
			assertTrue(results.numFunction < 100);
			assertTrue(results.numGradient < 100);
		}
		assertEquals(0, results.f, 1e-4);
	}
}
