/*
    * 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.random;
  
  import org.hipparchus.exception.NullArgumentException;
  import org.junit.jupiter.api.Test;
  
  import java.util.Random;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  /**
   * Test cases for the RandomAdaptor class.
   */
  class RandomAdaptorTest {
  
      @Test
      void testAdaptor() {
          ConstantGenerator generator = new ConstantGenerator();
          Random random = RandomAdaptor.of(generator);
          checkConstant(random);
          RandomAdaptor randomAdaptor = new RandomAdaptor(generator);
          checkConstant(randomAdaptor);
      }
  
      private void checkConstant(Random random) {
          byte[] bytes = new byte[] {0};
          random.nextBytes(bytes);
          assertEquals(0, bytes[0]);
          assertFalse(random.nextBoolean());
          assertEquals(0, random.nextDouble(), 0);
          assertEquals(0, random.nextFloat(), 0);
          assertEquals(0, random.nextGaussian(), 0);
          assertEquals(0, random.nextInt());
          assertEquals(0, random.nextInt(1));
          assertEquals(0, random.nextLong());
          random.setSeed(100);
          assertEquals(0, random.nextDouble(), 0);
      }
  
      @SuppressWarnings("unused")
      @Test
      void testNullGenerator(){
          assertThrows(NullArgumentException.class, () -> {
              RandomGenerator nullGenerator = null;
              Random random = new RandomAdaptor(nullGenerator);
          });
      }
  
      @SuppressWarnings("unused")
      @Test
      void testNullGenerator2(){
          assertThrows(NullArgumentException.class, () -> {
              RandomGenerator nullGenerator = null;
              Random random = RandomAdaptor.of(nullGenerator);
          });
      }
  
      /*
       * "Constant" generator to test Adaptor delegation.
       * "Powered by Eclipse ;-)"
       *
       */
      public static class ConstantGenerator implements RandomGenerator {
  
          private final double value;
  
          public ConstantGenerator() {
              value = 0;
          }
  
          public ConstantGenerator(double value) {
              this.value = value;
          }
  
          @Override
          public boolean nextBoolean() {
              return false;
         }
 
         @Override
         public void nextBytes(byte[] bytes) {
         }
 
         @Override
         public void nextBytes(byte[] bytes, int offset, int len) {
         }
 
         @Override
         public double nextDouble() {
             return value;
         }
 
         @Override
         public float nextFloat() {
             return (float) value;
         }
 
         @Override
         public double nextGaussian() {
             return value;
         }
 
         @Override
         public int nextInt() {
             return (int) value;
         }
 
         @Override
         public int nextInt(int n) {
             return (int) value;
         }
 
         @Override
         public long nextLong() {
             return (int) value;
         }
 
         @Override
         public long nextLong(long n) {
             return (int) value;
         }
 
         @Override
         public void setSeed(int seed) {
         }
 
         @Override
         public void setSeed(int[] seed) {
         }
 
         @Override
         public void setSeed(long seed) {
         }
 
     }
 }