/*
    * 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
    *
    *      https://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.
   */
  
  /*
   * This is not the original file distributed by the Apache Software Foundation
   * It has been modified by the Hipparchus project
   */
  package org.hipparchus.geometry.spherical.twod;
  
  import org.hipparchus.exception.MathIllegalArgumentException;
  import org.hipparchus.geometry.spherical.oned.Sphere1D;
  import org.hipparchus.random.RandomGenerator;
  import org.hipparchus.random.Well1024a;
  import org.hipparchus.util.FastMath;
  import org.hipparchus.util.MathUtils;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertNotSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class S2PointTest {
  
  
      @Test
      void testS2Point() {
          for (int k = -2; k < 3; ++k) {
              S2Point p = new S2Point(1.0 + k * MathUtils.TWO_PI, 1.4);
              assertEquals(1.0 + k * MathUtils.TWO_PI, p.getTheta(), 1.0e-10);
              assertEquals(1.4, p.getPhi(), 1.0e-10);
              assertEquals(FastMath.cos(1.0) * FastMath.sin(1.4), p.getVector().getX(), 1.0e-10);
              assertEquals(FastMath.sin(1.0) * FastMath.sin(1.4), p.getVector().getY(), 1.0e-10);
              assertEquals(FastMath.cos(1.4), p.getVector().getZ(), 1.0e-10);
              assertFalse(p.isNaN());
          }
      }
  
      @Test
      void testNegativePolarAngle() {
          assertThrows(MathIllegalArgumentException.class, () -> new S2Point(1.0, -1.0));
      }
  
      @Test
      void testTooLargePolarAngle() {
          assertThrows(MathIllegalArgumentException.class, () -> new S2Point(1.0, 3.5));
      }
  
      @Test
      void testNaN() {
          assertTrue(S2Point.NaN.isNaN());
          assertEquals(S2Point.NaN, new S2Point(Double.NaN, 1.0));
          assertNotEquals(S2Point.NaN, new S2Point(1.0, 1.3));
      }
  
      @SuppressWarnings("unlikely-arg-type")
      @Test
      void testEquals() {
          S2Point a = new S2Point(1.0, 1.0);
          S2Point b = new S2Point(1.0, 1.0);
          assertEquals(a.hashCode(), b.hashCode());
          assertNotSame(a, b);
          assertEquals(a, b);
          assertEquals(a, a);
          assertNotEquals('a', a);
          assertEquals(S2Point.NaN, S2Point.NaN);
          assertEquals(S2Point.NaN, new S2Point(Double.NaN, 0.0));
          assertEquals(S2Point.NaN, new S2Point(0.0, Double.NaN));
      }
  
      @Test
      void testEqualsIeee754() {
          S2Point a = new S2Point(1.0, 1.0);
          S2Point b = new S2Point(1.0, 1.0);
          assertEquals(a.hashCode(), b.hashCode());
          assertNotSame(a, b);
          assertTrue(a.equalsIeee754(b));
          assertTrue(a.equalsIeee754(a));
          assertFalse(a.equalsIeee754('a'));
          assertFalse(S2Point.NaN.equalsIeee754(S2Point.NaN));
          assertFalse(S2Point.NaN.equalsIeee754(new S2Point(Double.NaN, 0.0)));
          assertFalse(S2Point.NaN.equalsIeee754(new S2Point(0.0, Double.NaN)));
     }
 
     @Test
     void testDistance() {
         S2Point a = new S2Point(1.0, MathUtils.SEMI_PI);
         S2Point b = new S2Point(a.getTheta() + MathUtils.SEMI_PI, a.getPhi());
         assertEquals(MathUtils.SEMI_PI, a.distance(b), 1.0e-10);
         assertEquals(FastMath.PI, a.distance(a.negate()), 1.0e-10);
         assertEquals(MathUtils.SEMI_PI, S2Point.MINUS_I.distance(S2Point.MINUS_K), 1.0e-10);
         assertEquals(0.0, new S2Point(1.0, 0).distance(new S2Point(2.0, 0)), 1.0e-10);
     }
 
     @Test
     void testNegate() {
         RandomGenerator generator = new Well1024a(0x79d1bc2e0999d238L);
         for (int i = 0; i < 100000; ++i) {
             S2Point p = new S2Point(MathUtils.TWO_PI * generator.nextDouble(),
                                     FastMath.PI * generator.nextDouble());
             S2Point np = new S2Point(p.negate().getTheta(), p.negate().getPhi());
             assertEquals(FastMath.PI, p.distance(np), 1.4e-15);
         }
     }
 
     @Test
     void testSpace() {
         S2Point a = new S2Point(1.0, 1.0);
         assertInstanceOf(Sphere2D.class, a.getSpace());
         assertEquals(2, a.getSpace().getDimension());
         assertInstanceOf(Sphere1D.class, a.getSpace().getSubSpace());
     }
 
     @Test
     void testMoveTowards() {
         final S2Point s1 = new S2Point(2.0, 0.5);
         final S2Point s2 = new S2Point(4.0, 2.5);
         for (double r = 0.0; r <= 1.0; r += FastMath.scalb(1.0, -10)) {
             // motion should be linear according to angles
             assertEquals(r * s1.distance(s2), s1.distance(s1.moveTowards(s2, r)), 1.0e-14);
         }
     }
 
     @Test
     void testMoveTowardsSpecialCase() {
         final S2Point s = new S2Point(2.0, 0.5);
         for (double r = 0.0; r <= 1.0; r += FastMath.scalb(1.0, -10)) {
             // motion should be linear according to angles
             assertEquals(0.0, s.distance(s.moveTowards(s, r)), 1.0e-20);
         }
     }
 
 }