/*
 * Copyright (C) 2013 The Guava Authors
 *
 * Licensed 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 com.google.common.collect.testing.google;

import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.WrongType;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

import java.util.Collections;
import java.util.List;

/**
 * Tests for {@code Multiset#remove}, {@code Multiset.removeAll}, and {@code Multiset.retainAll}
 * not already covered by the corresponding Collection testers.
 * 
 * @author Jared Levy
 */
@GwtCompatible(emulated = true)
public class MultisetRemoveTester<E> extends AbstractMultisetTester<E> {  
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemoveNegative() {
    try {
      getMultiset().remove(samples.e0, -1);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {}
    expectUnchanged();
  }
  
  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemoveUnsupported() {
    try {
      getMultiset().remove(samples.e0, 2);
      fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException expected) {}
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemoveZeroNoOp() {
    int originalCount = getMultiset().count(samples.e0);
    assertEquals("old count", originalCount, getMultiset().remove(samples.e0, 0));
    expectUnchanged();
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_occurrences_present() {
    assertEquals("multiset.remove(present, 2) didn't return the old count",
        1, getMultiset().remove(samples.e0, 2));
    assertFalse("multiset contains present after multiset.remove(present, 2)",
        getMultiset().contains(samples.e0));
    assertEquals(0, getMultiset().count(samples.e0));
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_some_occurrences_present() {
    initThreeCopies();
    assertEquals("multiset.remove(present, 2) didn't return the old count",
        3, getMultiset().remove(samples.e0, 2));
    assertTrue("multiset contains present after multiset.remove(present, 2)",
        getMultiset().contains(samples.e0));
    assertEquals(1, getMultiset().count(samples.e0));
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_occurrences_absent() {
    assertEquals("multiset.remove(absent, 0) didn't return 0",
        0, getMultiset().remove(samples.e3, 2));
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemove_occurrences_unsupported_absent() {
    // notice: we don't care whether it succeeds, or fails with UOE
    try {
      assertEquals(
          "multiset.remove(absent, 2) didn't return 0 or throw an exception",
          0, getMultiset().remove(samples.e3, 2));
    } catch (UnsupportedOperationException ok) {}
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_occurrences_0() {
    int oldCount = getMultiset().count(samples.e0);
    assertEquals("multiset.remove(E, 0) didn't return the old count",
        oldCount, getMultiset().remove(samples.e0, 0));
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_occurrences_negative() {
    try {
      getMultiset().remove(samples.e0, -1);
      fail("multiset.remove(E, -1) didn't throw an exception");
    } catch (IllegalArgumentException required) {}
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_occurrences_wrongType() {
    assertEquals("multiset.remove(wrongType, 1) didn't return 0",
        0, getMultiset().remove(WrongType.VALUE, 1));
  }
  
  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_VALUES})
  public void testRemove_nullPresent() {
    initCollectionWithNullElement();
    assertEquals(1, getMultiset().remove(null, 2));
    assertFalse("multiset contains present after multiset.remove(present, 2)",
        getMultiset().contains(null));
    assertEquals(0, getMultiset().count(null));
  }
  
  @CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_QUERIES})
  public void testRemove_nullAbsent() {
    assertEquals(0, getMultiset().remove(null, 2));
  }
  
  @CollectionFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_QUERIES)
  public void testRemove_nullForbidden() {
    try {
      getMultiset().remove(null, 2);
      fail("Expected NullPointerException");
    } catch (NullPointerException expected) {}
  }
  
  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRemoveAllIgnoresCount() {
    initThreeCopies();
    assertTrue(getMultiset().removeAll(Collections.singleton(samples.e0)));
    assertThat(getMultiset()).isEmpty();
  }
  
  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testRetainAllIgnoresCount() {
    initThreeCopies();
    List<E> contents = Helpers.copyToList(getMultiset());
    assertFalse(getMultiset().retainAll(Collections.singleton(samples.e0)));
    expectContents(contents);
  }
}

