///////////////////////////////////////////////////////////////////////////////////////////////
   // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
   // Copyright (C) 2001-2026 the original author or authors.
   //
   // This library is free software; you can redistribute it and/or
   // modify it under the terms of the GNU Lesser General Public
   // License as published by the Free Software Foundation; either
   // version 2.1 of the License, or (at your option) any later version.
   //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.api;
  
  import static com.google.common.truth.Truth.assertWithMessage;
  import static com.puppycrawl.tools.checkstyle.internal.utils.TestUtil.getExpectedThrowable;
  
  import java.util.Objects;
  import java.util.Set;
  
  import org.junit.jupiter.api.Test;
  
  import com.puppycrawl.tools.checkstyle.filters.SeverityMatchFilter;
  
  public class FilterSetTest {
  
      @Test
      public void testGetFilters() {
          final FilterSet filterSet = new FilterSet();
          filterSet.addFilter(new SeverityMatchFilter());
          assertWithMessage("Invalid filter set size")
                  .that(filterSet.getFilters())
                  .hasSize(1);
      }
  
      @Test
      public void testRemoveFilters() {
          final FilterSet filterSet = new FilterSet();
          final Filter filter = new SeverityMatchFilter();
          filterSet.addFilter(filter);
          filterSet.removeFilter(filter);
          assertWithMessage("Invalid filter set size")
                  .that(filterSet.getFilters())
                  .hasSize(0);
      }
  
      @Test
      public void testToString() {
          final FilterSet filterSet = new FilterSet();
          filterSet.addFilter(new SeverityMatchFilter());
          assertWithMessage("Invalid filter set size")
                  .that(filterSet.toString())
                  .isNotNull();
      }
  
      @Test
      public void testClear() {
          final FilterSet filterSet = new FilterSet();
          filterSet.addFilter(new SeverityMatchFilter());
  
          assertWithMessage("Invalid filter set size")
                  .that(filterSet.getFilters())
                  .hasSize(1);
  
          filterSet.clear();
  
          assertWithMessage("Invalid filter set size")
                  .that(filterSet.getFilters())
                  .hasSize(0);
      }
  
      @Test
      public void testAccept() {
          final FilterSet filterSet = new FilterSet();
          filterSet.addFilter(new DummyFilter(true));
          assertWithMessage("invalid accept response")
                  .that(filterSet.accept(null))
                  .isTrue();
      }
  
      @Test
      public void testNotAccept() {
          final FilterSet filterSet = new FilterSet();
          filterSet.addFilter(new DummyFilter(false));
          assertWithMessage("invalid accept response")
                  .that(filterSet.accept(null))
                  .isFalse();
      }
  
      @Test
      public void testNotAcceptEvenIfOneAccepts() {
          final FilterSet filterSet = new FilterSet();
         filterSet.addFilter(new DummyFilter(true));
         filterSet.addFilter(new DummyFilter(false));
         assertWithMessage("invalid accept response")
                 .that(filterSet.accept(null))
                 .isFalse();
     }
 
     /*
       Due to low level configuration setup of FilterSet, conventional
       input validation cannot be done here hence, pure JUnit testing has been
       done for the time being
     */
     @Test
     public void testUnmodifiableSet() {
         final FilterSet filterSet = new FilterSet();
         final Filter filter = new FilterSet();
         filterSet.addFilter(filter);
         final Set<Filter> subFilterSet = filterSet.getFilters();
         final Exception ex = getExpectedThrowable(UnsupportedOperationException.class,
             () -> subFilterSet.add(filter));
         assertWithMessage("Exception message not expected")
                 .that(ex.getClass())
                 .isEqualTo(UnsupportedOperationException.class);
     }
 
     /*
       Input based test does not call toString, but this method might
       be useful for third party integrations
     */
     @Test
     public void testEmptyToString() {
         final FilterSet filterSet = new FilterSet();
         assertWithMessage("toString() result shouldn't be an empty string")
                 .that(filterSet.toString())
                 .isNotEmpty();
     }
 
     /**
      * Dummy filter for testing.
      *
      * @param acceptValue boolean flag to accept the event.
      */
     private record DummyFilter(boolean acceptValue) implements Filter {
 
         @Override
         public boolean accept(AuditEvent event) {
             return acceptValue;
         }
 
         @Override
         public int hashCode() {
             return Objects.hash(!acceptValue);
         }
 
         @Override
         public boolean equals(Object object) {
             if (getClass() != object.getClass()) {
                 return false;
             }
             final DummyFilter other = (DummyFilter) object;
             return Boolean.compare(acceptValue, other.acceptValue) == 0;
         }
 
     }
 
 }