/*
    * 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.collections4.comparators;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.Serializable;
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for ComparatorChain.
   */
  public class ComparatorChainTest extends AbstractComparatorTest<ComparatorChainTest.PseudoRow> {
  
      public static class ColumnComparator implements Comparator<PseudoRow>, Serializable {
          private static final long serialVersionUID = -2284880866328872105L;
  
          protected int colIndex;
  
          public ColumnComparator(final int colIndex) {
              this.colIndex = colIndex;
          }
  
          @Override
          public int compare(final PseudoRow o1, final PseudoRow o2) {
              return Integer.compare(o1.getColumn(colIndex), o2.getColumn(colIndex));
          }
  
          @Override
          public boolean equals(final Object that) {
              return that instanceof ColumnComparator && colIndex == ((ColumnComparator) that).colIndex;
          }
  
          @Override
          public int hashCode() {
              return colIndex;
          }
      }
  
      public static class PseudoRow implements Serializable {
  
          /**
           * Generated serial version ID.
           */
          private static final long serialVersionUID = 8085570439751032499L;
          public int[] cols = new int[3];
  
          public PseudoRow(final int col1, final int col2, final int col3) {
              cols[0] = col1;
              cols[1] = col2;
              cols[2] = col3;
          }
  
          @Override
          public boolean equals(final Object o) {
              if (!(o instanceof PseudoRow)) {
                  return false;
              }
  
              final PseudoRow row = (PseudoRow) o;
  
              return getColumn(0) == row.getColumn(0) && getColumn(1) == row.getColumn(1) && getColumn(2) == row.getColumn(2);
          }
  
          @Override
          public int hashCode() {
              return Arrays.hashCode(cols);
          }
  
          public int getColumn(final int colIndex) {
              return cols[colIndex];
          }
  
          @Override
          public String toString() {
              return "[" + cols[0] + "," + cols[1] + "," + cols[2] + "]";
          }
      }
 
 //    public void testCreate() throws Exception {
 //        writeExternalFormToDisk((java.io.Serializable) makeObject(), "src/test/resources/data/test/ComparatorChain.version4.obj");
 //    }
 
     @Override
     public List<PseudoRow> getComparableObjectsOrdered() {
         // this is the correct order assuming a
         // "0th forward, 1st reverse, 2nd forward" sort
         return new LinkedList<>(Arrays.asList(new PseudoRow(1, 2, 3), new PseudoRow(2, 3, 5),
                 new PseudoRow(2, 2, 4), new PseudoRow(2, 2, 8), new PseudoRow(3, 1, 0),
                 new PseudoRow(4, 4, 4), new PseudoRow(4, 4, 7)));
     }
 
     @Override
     public String getCompatibilityVersion() {
         return "4";
     }
 
     @Override
     public Comparator<PseudoRow> makeObject() {
         final ComparatorChain<PseudoRow> chain = new ComparatorChain<>(new ColumnComparator(0));
         chain.addComparator(new ColumnComparator(1), true); // reverse the second column
         chain.addComparator(new ColumnComparator(2), false);
         return chain;
     }
 
     @Test
     public void testBadListComparatorChain() {
         final List<Comparator<Integer>> list = new LinkedList<>();
         final ComparatorChain<Integer> chain = new ComparatorChain<>(list);
         final Integer i1 = 4;
         final Integer i2 = 6;
 
         assertThrows(UnsupportedOperationException.class, () -> chain.compare(i1, i2));
     }
 
     @Test
     public void testBadNoopComparatorChain() {
         final ComparatorChain<Integer> chain = new ComparatorChain<>();
         final Integer i1 = 4;
         final Integer i2 = 6;
 
         assertThrows(UnsupportedOperationException.class, () -> chain.compare(i1, i2), "An exception should be thrown when a chain contains zero comparators.");
     }
 
     @Test
     public void testComparatorChainOnMinValuedComparator() {
         // -1 * Integer.MIN_VALUE is less than 0,
         // test that ComparatorChain handles this edge case correctly
         final ComparatorChain<Integer> chain = new ComparatorChain<>();
         chain.addComparator((a, b) -> {
             final int result = a.compareTo(b);
             if (result < 0) {
                 return Integer.MIN_VALUE;
             }
             if (result > 0) {
                 return Integer.MAX_VALUE;
             }
             return 0;
         }, true);
 
         assertTrue(chain.compare(4, 5) > 0);
         assertTrue(chain.compare(5, 4) < 0);
         assertEquals(0, chain.compare(4, 4));
     }
 
     @Test
     public void testListComparatorChain() {
         final List<Comparator<Integer>> list = new LinkedList<>();
         list.add(new ComparableComparator<>());
         final ComparatorChain<Integer> chain = new ComparatorChain<>(list);
         final Integer i1 = 4;
         final Integer i2 = 6;
 
         final int correctValue = i1.compareTo(i2);
         assertEquals(chain.compare(i1, i2), correctValue, "Comparison returns the right order");
     }
 
     @Test
     public void testNoopComparatorChain() {
         final ComparatorChain<Integer> chain = new ComparatorChain<>();
         final Integer i1 = 4;
         final Integer i2 = 6;
         chain.addComparator(new ComparableComparator<>());
 
         final int correctValue = i1.compareTo(i2);
         assertEquals(chain.compare(i1, i2), correctValue, "Comparison returns the right order");
     }
 
 }