/*
 * Copyright (C) 2007 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;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableSet.Builder;
import com.google.common.testing.EqualsTester;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Set;

/**
 * Unit test for {@link ImmutableSet}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 * @author Nick Kralevich
 */
@GwtCompatible(emulated = true)
public class ImmutableSetTest extends AbstractImmutableSetTest {

  @Override protected Set<String> of() {
    return ImmutableSet.of();
  }

  @Override protected Set<String> of(String e) {
    return ImmutableSet.of(e);
  }

  @Override protected Set<String> of(String e1, String e2) {
    return ImmutableSet.of(e1, e2);
  }

  @Override protected Set<String> of(String e1, String e2, String e3) {
    return ImmutableSet.of(e1, e2, e3);
  }

  @Override protected Set<String> of(
      String e1, String e2, String e3, String e4) {
    return ImmutableSet.of(e1, e2, e3, e4);
  }

  @Override protected Set<String> of(
      String e1, String e2, String e3, String e4, String e5) {
    return ImmutableSet.of(e1, e2, e3, e4, e5);
  }

  @Override protected Set<String> of(String e1, String e2, String e3,
      String e4, String e5, String e6, String... rest) {
    return ImmutableSet.of(e1, e2, e3, e4, e5, e6, rest);
  }

  @Override protected Set<String> copyOf(String[] elements) {
    return ImmutableSet.copyOf(elements);
  }

  @Override protected Set<String> copyOf(Collection<String> elements) {
    return ImmutableSet.copyOf(elements);
  }

  @Override protected Set<String> copyOf(Iterable<String> elements) {
    return ImmutableSet.copyOf(elements);
  }

  @Override protected Set<String> copyOf(Iterator<String> elements) {
    return ImmutableSet.copyOf(elements);
  }

  public void testCreation_allDuplicates() {
    ImmutableSet<String> set = ImmutableSet.copyOf(Lists.newArrayList("a", "a"));
    assertTrue(set instanceof SingletonImmutableSet);
    assertEquals(Lists.newArrayList("a"), Lists.newArrayList(set));
  }

  public void testCreation_oneDuplicate() {
    // now we'll get the varargs overload
    ImmutableSet<String> set = ImmutableSet.of(
        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "a");
    assertEquals(Lists.newArrayList(
        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m"),
        Lists.newArrayList(set));
  }

  public void testCreation_manyDuplicates() {
    // now we'll get the varargs overload
    ImmutableSet<String> set = ImmutableSet.of(
        "a", "b", "c", "c", "c", "c", "b", "b", "a", "a", "c", "c", "c", "a");
    assertThat(set).containsExactly("a", "b", "c").inOrder();
  }

  public void testCreation_arrayOfArray() {
    String[] array = new String[] { "a" };
    Set<String[]> set = ImmutableSet.<String[]>of(array);
    assertEquals(Collections.singleton(array), set);
  }

  public void testCopyOf_copiesImmutableSortedSet() {
    ImmutableSortedSet<String> sortedSet = ImmutableSortedSet.of("a");
    ImmutableSet<String> copy = ImmutableSet.copyOf(sortedSet);
    assertNotSame(sortedSet, copy);
  }

  @Override <E extends Comparable<E>> Builder<E> builder() {
    return ImmutableSet.builder();
  }

  @Override int getComplexBuilderSetLastElement() {
    return LAST_COLOR_ADDED;
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(ImmutableSet.of(), ImmutableSet.of())
        .addEqualityGroup(ImmutableSet.of(1), ImmutableSet.of(1), ImmutableSet.of(1, 1))
        .addEqualityGroup(ImmutableSet.of(1, 2, 1), ImmutableSet.of(2, 1, 1))
        .testEquals();
  }
}

