/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.math.analysis.solvers;

import org.apache.commons.math.MathException;
import org.apache.commons.math.analysis.QuinticFunction;
import org.apache.commons.math.analysis.SinFunction;
import org.apache.commons.math.analysis.UnivariateRealFunction;

import junit.framework.TestCase;

/**
 * @version $Revision$ $Date$
 */
public final class BisectionSolverTest extends TestCase {

	@Deprecated
	public void testDeprecated() throws MathException {
		UnivariateRealFunction f = new SinFunction();
		double result;

		UnivariateRealSolver solver = new BisectionSolver(f);
		result = solver.solve(3, 4);
		assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());

		result = solver.solve(1, 4);
		assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
	}

	public void testSinZero() throws MathException {
		UnivariateRealFunction f = new SinFunction();
		double result;

		UnivariateRealSolver solver = new BisectionSolver();
		result = solver.solve(f, 3, 4);
		assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 1, 4);
		assertEquals(result, Math.PI, solver.getAbsoluteAccuracy());
	}

	public void testQuinticZero() throws MathException {
		UnivariateRealFunction f = new QuinticFunction();
		double result;

		UnivariateRealSolver solver = new BisectionSolver();
		result = solver.solve(f, -0.2, 0.2);
		assertEquals(result, 0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, -0.1, 0.3);
		assertEquals(result, 0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, -0.3, 0.45);
		assertEquals(result, 0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.3, 0.7);
		assertEquals(result, 0.5, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.2, 0.6);
		assertEquals(result, 0.5, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.05, 0.95);
		assertEquals(result, 0.5, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.85, 1.25);
		assertEquals(result, 1.0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.8, 1.2);
		assertEquals(result, 1.0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.85, 1.75);
		assertEquals(result, 1.0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.55, 1.45);
		assertEquals(result, 1.0, solver.getAbsoluteAccuracy());

		result = solver.solve(f, 0.85, 5);
		assertEquals(result, 1.0, solver.getAbsoluteAccuracy());

		assertEquals(result, solver.getResult(), 0);
		assertTrue(solver.getIterationCount() > 0);
	}

	/**
	 * 
	 */
	public void testSetFunctionValueAccuracy() {
		double expected = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		solver.setFunctionValueAccuracy(expected);
		assertEquals(expected, solver.getFunctionValueAccuracy(), 1.0e-2);
	}

	/**
	 * 
	 */
	public void testResetFunctionValueAccuracy() {
		double newValue = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		double oldValue = solver.getFunctionValueAccuracy();
		solver.setFunctionValueAccuracy(newValue);
		solver.resetFunctionValueAccuracy();
		assertEquals(oldValue, solver.getFunctionValueAccuracy(), 1.0e-2);
	}

	/**
	 * 
	 */
	public void testSetAbsoluteAccuracy() {
		double expected = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		solver.setAbsoluteAccuracy(expected);
		assertEquals(expected, solver.getAbsoluteAccuracy(), 1.0e-2);
	}

	/**
	 * 
	 */
	public void testResetAbsoluteAccuracy() {
		double newValue = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		double oldValue = solver.getAbsoluteAccuracy();
		solver.setAbsoluteAccuracy(newValue);
		solver.resetAbsoluteAccuracy();
		assertEquals(oldValue, solver.getAbsoluteAccuracy(), 1.0e-2);
	}

	/**
	 * 
	 */
	public void testSetMaximalIterationCount() {
		int expected = 100;
		UnivariateRealSolver solver = new BisectionSolver();
		solver.setMaximalIterationCount(expected);
		assertEquals(expected, solver.getMaximalIterationCount());
	}

	/**
	 * 
	 */
	public void testResetMaximalIterationCount() {
		int newValue = 10000;
		UnivariateRealSolver solver = new BisectionSolver();
		int oldValue = solver.getMaximalIterationCount();
		solver.setMaximalIterationCount(newValue);
		solver.resetMaximalIterationCount();
		assertEquals(oldValue, solver.getMaximalIterationCount());
	}

	/**
	 * 
	 */
	public void testSetRelativeAccuracy() {
		double expected = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		solver.setRelativeAccuracy(expected);
		assertEquals(expected, solver.getRelativeAccuracy(), 1.0e-2);
	}

	/**
	 * 
	 */
	public void testResetRelativeAccuracy() {
		double newValue = 1.0e-2;
		UnivariateRealSolver solver = new BisectionSolver();
		double oldValue = solver.getRelativeAccuracy();
		solver.setRelativeAccuracy(newValue);
		solver.resetRelativeAccuracy();
		assertEquals(oldValue, solver.getRelativeAccuracy(), 1.0e-2);
	}

}
