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/**
 * 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.
 *
 * Copyright 2012-2016 the original author or authors.
 */
package com.fitbur.assertj.internal;

import static java.util.Arrays.asList;
import static java.util.stream.StreamSupport.stream;
import static com.fitbur.assertj.error.ConditionAndGroupGenericParameterTypeShouldBeTheSame.shouldBeSameGenericBetweenIterableAndCondition;
import static com.fitbur.assertj.error.ElementsShouldBe.elementsShouldBe;
import static com.fitbur.assertj.error.ElementsShouldBeAtLeast.elementsShouldBeAtLeast;
import static com.fitbur.assertj.error.ElementsShouldBeAtMost.elementsShouldBeAtMost;
import static com.fitbur.assertj.error.ElementsShouldBeExactly.elementsShouldBeExactly;
import static com.fitbur.assertj.error.ElementsShouldHave.elementsShouldHave;
import static com.fitbur.assertj.error.ElementsShouldHaveAtLeast.elementsShouldHaveAtLeast;
import static com.fitbur.assertj.error.ElementsShouldHaveAtMost.elementsShouldHaveAtMost;
import static com.fitbur.assertj.error.ElementsShouldHaveExactly.elementsShouldHaveExactly;
import static com.fitbur.assertj.error.ElementsShouldMatch.elementsShouldMatch;
import static com.fitbur.assertj.error.ElementsShouldNotBe.elementsShouldNotBe;
import static com.fitbur.assertj.error.ElementsShouldNotHave.elementsShouldNotHave;
import static com.fitbur.assertj.error.ShouldBeEmpty.shouldBeEmpty;
import static com.fitbur.assertj.error.ShouldBeNullOrEmpty.shouldBeNullOrEmpty;
import static com.fitbur.assertj.error.ShouldBeSubsetOf.shouldBeSubsetOf;
import static com.fitbur.assertj.error.ShouldContain.shouldContain;
import static com.fitbur.assertj.error.ShouldContainExactly.elementsDifferAtIndex;
import static com.fitbur.assertj.error.ShouldContainExactly.shouldContainExactly;
import static com.fitbur.assertj.error.ShouldContainExactly.shouldHaveSameSize;
import static com.fitbur.assertj.error.ShouldContainExactlyInAnyOrder.*;
import static com.fitbur.assertj.error.ShouldContainNull.shouldContainNull;
import static com.fitbur.assertj.error.ShouldContainOnly.shouldContainOnly;
import static com.fitbur.assertj.error.ShouldContainSequence.shouldContainSequence;
import static com.fitbur.assertj.error.ShouldContainSubsequence.shouldContainSubsequence;
import static com.fitbur.assertj.error.ShouldContainsOnlyOnce.shouldContainsOnlyOnce;
import static com.fitbur.assertj.error.ShouldEndWith.shouldEndWith;
import static com.fitbur.assertj.error.ShouldNotBeEmpty.shouldNotBeEmpty;
import static com.fitbur.assertj.error.ShouldNotContain.shouldNotContain;
import static com.fitbur.assertj.error.ShouldNotContainNull.shouldNotContainNull;
import static com.fitbur.assertj.error.ShouldNotHaveDuplicates.shouldNotHaveDuplicates;
import static com.fitbur.assertj.error.ShouldStartWith.shouldStartWith;
import static com.fitbur.assertj.internal.Arrays.assertIsArray;
import static com.fitbur.assertj.internal.CommonValidations.checkIsNotNull;
import static com.fitbur.assertj.internal.CommonValidations.checkIsNotNullAndNotEmpty;
import static com.fitbur.assertj.internal.CommonValidations.checkIterableIsNotNull;
import static com.fitbur.assertj.internal.CommonValidations.checkSizes;
import static com.fitbur.assertj.internal.CommonValidations.failIfEmptySinceActualIsNotEmpty;
import static com.fitbur.assertj.internal.CommonValidations.hasSameSizeAsCheck;
import static com.fitbur.assertj.util.IterableUtil.isNullOrEmpty;
import static com.fitbur.assertj.util.IterableUtil.sizeOf;
import static com.fitbur.assertj.util.Lists.newArrayList;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.function.Predicate;

import com.fitbur.assertj.api.AssertionInfo;
import com.fitbur.assertj.api.Condition;
import com.fitbur.assertj.util.VisibleForTesting;

/**
 * Reusable assertions for {@link Iterable}s.
 * 
 * @author Alex Ruiz
 * @author Yvonne Wang
 * @author Maciej Jaskowski
 * @author Nicolas François
 * @author Joel Costigliola
 */
public class Iterables {

  private static final Iterables INSTANCE = new Iterables();
  private final ComparisonStrategy comparisonStrategy;
  @VisibleForTesting
  Failures failures = Failures.instance();
  @VisibleForTesting
  Conditions conditions = Conditions.instance();
  @VisibleForTesting
  Predicates predicates = Predicates.instance();

  /**
   * Returns the singleton instance of this class based on {@link StandardComparisonStrategy}.
   * 
   * @return the singleton instance of this class based on {@link StandardComparisonStrategy}.
   */
  public static Iterables instance() {
    return INSTANCE;
  }

  @VisibleForTesting
  Iterables() {
    this(StandardComparisonStrategy.instance());
  }

  public Iterables(ComparisonStrategy comparisonStrategy) {
    this.comparisonStrategy = comparisonStrategy;
  }

  @VisibleForTesting
  public Comparator getComparator() {
    if (comparisonStrategy instanceof ComparatorBasedComparisonStrategy) {
      return ((ComparatorBasedComparisonStrategy) comparisonStrategy).getComparator();
    }
    return null;
  }

  @VisibleForTesting
  public ComparisonStrategy getComparisonStrategy() {
    return comparisonStrategy;
  }

  /**
   * Asserts that the given {@link Iterable} is {@code null} or empty.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws AssertionError if the given {@code Iterable} is not {@code null} *and* contains one or more elements.
   */
  public void assertNullOrEmpty(AssertionInfo info, Iterable actual) {
    if (!isNullOrEmpty(actual)) throw failures.failure(info, shouldBeNullOrEmpty(actual));
  }

  /**
   * Asserts that the given {@code Iterable} is empty.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} is not empty.
   */
  public void assertEmpty(AssertionInfo info, Iterable actual) {
    assertNotNull(info, actual);
    if (!isNullOrEmpty(actual)) throw failures.failure(info, shouldBeEmpty(actual));
  }

  /**
   * Asserts that the given {@code Iterable} is not empty.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} is empty.
   */
  public void assertNotEmpty(AssertionInfo info, Iterable actual) {
    assertNotNull(info, actual);
    if (isNullOrEmpty(actual)) throw failures.failure(info, shouldNotBeEmpty());
  }

  /**
   * Asserts that the number of elements in the given {@code Iterable} is equal to the expected one.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param expectedSize the expected size of {@code actual}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the number of elements in the given {@code Iterable} is different than the expected one.
   */
  public void assertHasSize(AssertionInfo info, Iterable actual, int expectedSize) {
    assertNotNull(info, actual);
    checkSizes(actual, sizeOf(actual), expectedSize, info);
  }

  /**
   * Assert that the actual {@code Iterable} has the same size as the other array.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param other the given array to compare.
   * @throws AssertionError if the actual group is {@code null}.
   * @throws AssertionError if the other group is {@code null}.
   * @throws AssertionError if actual {@code Iterable} and other array don't have the same size.
   */
  public void assertHasSameSizeAs(AssertionInfo info, Iterable actual, Object other) {
    assertNotNull(info, actual);
    assertIsArray(info, other);
    hasSameSizeAsCheck(info, actual, other, sizeOf(actual));
  }

  /**
   * Assert that the actual {@code Iterable} has the same size as the other {@code Iterable}.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param other the given {@code Iterable}.
   * @throws AssertionError if the actual group is {@code null}.
   * @throws AssertionError if the other group is {@code null}.
   * @throws AssertionError if actual and other {@code Iterable} don't have the same size.
   */
  public void assertHasSameSizeAs(AssertionInfo info, Iterable actual, Iterable other) {
    assertNotNull(info, actual);
    hasSameSizeAsCheck(info, actual, other, sizeOf(actual));
  }

  /**
   * Asserts that the given {@code Iterable} contains the given values, in any order.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param values the values that are expected to be in the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain the given values.
   */
  public void assertContains(AssertionInfo info, Iterable actual, Object[] values) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, values))
      return;
    // check for elements in values that are missing in actual.
    assertIterableContainsGivenValues(actual, values, info);
  }

  private void assertIterableContainsGivenValues(Iterable actual, Object[] values, AssertionInfo info) {
    Set notFound = new LinkedHashSet<>();
    for (Object value : values) {
      if (!iterableContains(actual, value)) {
        notFound.add(value);
      }
    }
    if (notFound.isEmpty())
      return;
    throw failures.failure(info, shouldContain(actual, values, notFound, comparisonStrategy));
  }

  /**
   * Delegates to {@link ComparisonStrategy#iterableContains(Iterable, Object)}
   */
  private boolean iterableContains(Iterable actual, Object value) {
    return comparisonStrategy.iterableContains(actual, value);
  }

  /**
   * Delegates to {@link ComparisonStrategy#iterableRemoves(Iterable, Object)}
   */
  private void iterableRemoves(Iterable actual, Object value) {
    comparisonStrategy.iterableRemoves(actual, value);
  }

  /**
   * Delegates to {@link ComparisonStrategy#iterablesRemoveFirst(Iterable, Object)}
   */
  private void iterablesRemoveFirst(Iterable actual, Object value) {
    comparisonStrategy.iterablesRemoveFirst(actual, value);
  }

  /**
   * Asserts that the given {@code Iterable} contains only the given values and nothing else, in any order.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param values the values that are expected to be in the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain the given values or if the given
   *           {@code Iterable} contains values that are not in the given array.
   */
  public void assertContainsOnly(AssertionInfo info, Iterable actual, Object[] values) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, values))
      return;
    // check for elements in values that are missing in actual.
    List notExpected = asListWithoutDuplicatesAccordingToComparisonStrategy(actual);
    List notFound = containsOnly(notExpected, values);
    if (!notExpected.isEmpty() || !notFound.isEmpty())
      throw failures.failure(info, shouldContainOnly(actual, values, notFound, notExpected, comparisonStrategy));
  }

  private List containsOnly(Collection actual, Object[] values) {
    List list = new ArrayList<>();
    for (Object o : listWithoutDuplicates(values)) {
      if (iterableContains(actual, o)) {
        iterableRemoves(actual, o);
      } else {
        list.add(o);
      }
    }
    return list;
  }

  private List listWithoutDuplicates(Object... elements) {
    return elements == null ? null : asListWithoutDuplicatesAccordingToComparisonStrategy(asList(elements));
  }

  /**
   * build a Set with that avoid duplicates according to given comparison strategy
   * 
   * @param iterable to feed the Set we want to build
   * @return a Set without duplicates according to given comparison strategy
   */
  private List asListWithoutDuplicatesAccordingToComparisonStrategy(Iterable iterable) {
    if (iterable == null) return null;
    List list = new ArrayList<>();
    for (Object e : iterable) {
      // only add is not already there
      if (!iterableContains(list, e)) {
        list.add(e);
      }
    }
    return list;
  }

  /**
   * Asserts that the given {@code Iterable} contains the given values and only once.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param values the values that are expected to be in the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain the given values or if the given
   *           {@code Iterable} contains values that are not in the given array.
   */
  public void assertContainsOnlyOnce(AssertionInfo info, Iterable actual, Object[] values) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, values)) return;
    // check for elements in values that are missing in actual.
    Set notFound = new LinkedHashSet<>();
    Set notOnlyOnce = new LinkedHashSet<>();
    Iterable actualDuplicates = comparisonStrategy.duplicatesFrom(actual);
    for (Object expectedOnlyOnce : values) {
      if (!iterableContains(actual, expectedOnlyOnce)) {
        notFound.add(expectedOnlyOnce);
      } else if (iterableContains(actualDuplicates, expectedOnlyOnce)) {
        notOnlyOnce.add(expectedOnlyOnce);
      }
    }
    if (!notFound.isEmpty() || !notOnlyOnce.isEmpty())
      throw failures.failure(info, shouldContainsOnlyOnce(actual, values, notFound, notOnlyOnce, comparisonStrategy));
    // assertion succeeded
  }

  /**
   * Verifies that the given {@link Iterable} contains the given sequence of objects, without any other
   * objects between them.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param sequence the sequence of objects to look for.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws NullPointerException if the given sequence is {@code null}.
   * @throws IllegalArgumentException if the given sequence is empty.
   * @throws AssertionError if the given {@code Iterable} does not contain the given sequence of objects.
   */
  public void assertContainsSequence(AssertionInfo info, Iterable actual, Object[] sequence) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, sequence)) return;
    // check for elements in values that are missing in actual.
    List actualAsList = newArrayList(actual);
    for (int i = 0; i < actualAsList.size(); i++) {
      // look for given sequence in actual starting from current index (i)
      if (containsSequenceAtGivenIndex(actualAsList, sequence, i)) return;
    }
    throw actualDoesNotContainSequence(info, actual, sequence);
  }

  /**
   * Verifies that the given {@link Iterable} contains the given subsequence of objects (possibly with
   * other values between them).
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param subsequence the subsequence of objects to look for.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws NullPointerException if the given sequence is {@code null}.
   * @throws IllegalArgumentException if the given subsequence is empty.
   * @throws AssertionError if the given {@code Iterable} does not contain the given subsequence of objects.
   */
  public void assertContainsSubsequence(AssertionInfo info, Iterable actual, Object[] subsequence) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, subsequence)) return;

    Iterator actualIterator = actual.iterator();
    int subsequenceIndex = 0;
    while (actualIterator.hasNext() && subsequenceIndex < subsequence.length) {
      Object actualNext = actualIterator.next();
      Object subsequenceNext = subsequence[subsequenceIndex];
      if (areEqual(actualNext, subsequenceNext)) subsequenceIndex++;
    }

    if (subsequenceIndex < subsequence.length) throw actualDoesNotContainSubsequence(info, actual, subsequence);
  }

  /**
   * Verifies that the actual Iterable is a subset of values Iterable. 

   * Both actual and given iterable are treated as sets, therefore duplicates on either of them are ignored.
   * 
   * @param info contains information about the assertion.
   * @param actual the actual {@code Iterable}.
   * @param values the {@code Iterable} that should contain all actual elements.
   * @throws AssertionError if the actual {@code Iterable} is {@code null}.
   * @throws NullPointerException if the given Iterable is {@code null}.
   * @throws AssertionError if the actual {@code Iterable} is not subset of set {@link Iterable}
   */
  public void assertIsSubsetOf(AssertionInfo info, Iterable actual, Iterable values) {
    assertNotNull(info, actual);
    checkIterableIsNotNull(info, values);
    List extra = newArrayList();
    for (Object actualElement : actual) {
      if (!iterableContains(values, actualElement)) extra.add(actualElement);
    }
    if (extra.size() > 0) throw failures.failure(info, shouldBeSubsetOf(actual, values, extra, comparisonStrategy));
  }

  /**
   * Return true if actualAsList contains exactly the given sequence at given starting index, false otherwise.
   * 
   * @param actualAsList the list to look sequance in
   * @param sequence the sequence to look for
   * @param startingIndex the index of actual list at which we start looking for sequence.
   * @return true if actualAsList contains exactly the given sequence at given starting index, false otherwise.
   */
  private boolean containsSequenceAtGivenIndex(List actualAsList, Object[] sequence, int startingIndex) {
    // check that, starting from given index, actualAsList has enough remaining elements to contain sequence
    if (actualAsList.size() - startingIndex < sequence.length) return false;
    for (int i = 0; i < sequence.length; i++) {
      if (!areEqual(actualAsList.get(startingIndex + i), sequence[i])) return false;
    }
    return true;
  }

  /**
   * Delegates to {@link ComparisonStrategy#areEqual(Object, Object)}
   */
  private boolean areEqual(Object actual, Object other) {
    return comparisonStrategy.areEqual(actual, other);
  }

  private AssertionError actualDoesNotContainSequence(AssertionInfo info, Iterable actual, Object[] sequence) {
    return failures.failure(info, shouldContainSequence(actual, sequence, comparisonStrategy));
  }

  private AssertionError actualDoesNotContainSubsequence(AssertionInfo info, Iterable actual, Object[] subsequence) {
    return failures.failure(info, shouldContainSubsequence(actual, subsequence, comparisonStrategy));
  }

  /**
   * Asserts that the given {@code Iterable} does not contain the given values.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param values the values that are expected not to be in the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} contains any of given values.
   */
  public void assertDoesNotContain(AssertionInfo info, Iterable actual, Object[] values) {
    checkIsNotNullAndNotEmpty(values);
    assertNotNull(info, actual);
    Set found = new LinkedHashSet<>();
    for (Object o : values) {
      if (iterableContains(actual, o)) found.add(o);
    }
    if (!found.isEmpty()) throw failures.failure(info, shouldNotContain(actual, values, found, comparisonStrategy));
  }

  /**
   * Asserts that the given {@code Iterable} does not contain the given values.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param iterable the values that are expected not to be in the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} contains any of given values.
   */
  public  void assertDoesNotContainAnyElementsOf(AssertionInfo info, Iterable actual,
                                                    Iterable iterable) {
    checkIsNotNullAndNotEmpty(iterable);
    List values = newArrayList(iterable);
    assertDoesNotContain(info, actual, values.toArray());
  }

  /**
   * Asserts that the given {@code Iterable} does not have duplicate values.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws IllegalArgumentException if the array of values is empty.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} contains duplicate values.
   */
  public void assertDoesNotHaveDuplicates(AssertionInfo info, Iterable actual) {
    assertNotNull(info, actual);
    Iterable duplicates = comparisonStrategy.duplicatesFrom(actual);
    if (!isNullOrEmpty(duplicates))
      throw failures.failure(info, shouldNotHaveDuplicates(actual, duplicates, comparisonStrategy));
  }

  /**
   * Verifies that the given {@code Iterable} starts with the given sequence of objects, without any other objects
   * between them. Similar to {@link #assertContainsSequence(AssertionInfo, Iterable, Object[])}, but it
   * also verifies that the first element in the sequence is also the first element of the given {@code Iterable}.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param sequence the sequence of objects to look for.
   * @throws NullPointerException if the given argument is {@code null}.
   * @throws IllegalArgumentException if the given argument is an empty array.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not start with the given sequence of objects.
   */
  public void assertStartsWith(AssertionInfo info, Iterable actual, Object[] sequence) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, sequence)) return;
    int i = 0;
    for (Object actualCurrentElement : actual) {
      if (i >= sequence.length) break;
      if (areEqual(actualCurrentElement, sequence[i++])) continue;
      throw actualDoesNotStartWithSequence(info, actual, sequence);
    }
    if (sequence.length > i) {
      // sequence has more elements than actual
      throw actualDoesNotStartWithSequence(info, actual, sequence);
    }
  }

  private AssertionError actualDoesNotStartWithSequence(AssertionInfo info, Iterable actual, Object[] sequence) {
    return failures.failure(info, shouldStartWith(actual, sequence, comparisonStrategy));
  }

  /**
   * Verifies that the given {@code Iterable} ends with the given sequence of objects, without any other objects between
   * them. Similar to {@link #assertContainsSequence(AssertionInfo, Iterable, Object[])}, but it also
   * verifies that the last element in the sequence is also the last element of the given {@code Iterable}.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param sequence the sequence of objects to look for.
   * @throws NullPointerException if the given argument is {@code null}.
   * @throws IllegalArgumentException if the given argument is an empty array.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not end with the given sequence of objects.
   */
  public void assertEndsWith(AssertionInfo info, Iterable actual, Object[] sequence) {
    if (commonCheckThatIterableAssertionSucceeds(info, actual, sequence)) return;

    int sizeOfActual = sizeOf(actual);
    if (sizeOfActual < sequence.length) throw actualDoesNotEndWithSequence(info, actual, sequence);

    int start = sizeOfActual - sequence.length;
    int sequenceIndex = 0, indexOfActual = 0;
    for (Object actualElement : actual) {
      if (indexOfActual++ < start) continue;
      if (areEqual(actualElement, sequence[sequenceIndex++])) continue;
      throw actualDoesNotEndWithSequence(info, actual, sequence);
    }
  }

  private boolean commonCheckThatIterableAssertionSucceeds(AssertionInfo info, Iterable actual, Object[] sequence) {
    checkIsNotNull(sequence);
    assertNotNull(info, actual);
    // if both actual and values are empty, then assertion passes.
    if (!actual.iterator().hasNext() && sequence.length == 0) return true;
    failIfEmptySinceActualIsNotEmpty(sequence);
    return false;
  }

  /**
   * Asserts that the given {@code Iterable} contains at least a null element.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain at least a null element.
   */
  public void assertContainsNull(AssertionInfo info, Iterable actual) {
    assertNotNull(info, actual);
    if (!iterableContains(actual, null)) throw failures.failure(info, shouldContainNull(actual));
  }

  /**
   * Asserts that the given {@code Iterable} does not contain null elements.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} contains a null element.
   */
  public void assertDoesNotContainNull(AssertionInfo info, Iterable actual) {
    assertNotNull(info, actual);
    if (iterableContains(actual, null)) throw failures.failure(info, shouldNotContainNull(actual));
  }

  /**
   * Assert that each element of given {@code Iterable} satisfies the given condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to T.
   * @throws AssertionError if one or more elements do not satisfy the given condition.
   */
  public  void assertAre(AssertionInfo info, Iterable actual, Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      List notSatisfiesCondition = notSatisfyingCondition(actual, condition);
      if (!notSatisfiesCondition.isEmpty())
        throw failures.failure(info, elementsShouldBe(actual, notSatisfiesCondition, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * Assert that each element of given {@code Iterable} not satisfies the given condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if one or more elements satisfy the given condition.
   */
  public  void assertAreNot(AssertionInfo info, Iterable actual, Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      List satisfiesCondition = satisfiesCondition(actual, condition);
      if (!satisfiesCondition.isEmpty())
        throw failures.failure(info, elementsShouldNotBe(actual, satisfiesCondition, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * Assert that each element of given {@code Iterable} satisfies the given condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if one or more elements do not satisfy the given condition.
   */
  public  void assertHave(AssertionInfo info, Iterable actual, Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      List notSatisfiesCondition = notSatisfyingCondition(actual, condition);
      if (!notSatisfiesCondition.isEmpty())
        throw failures.failure(info, elementsShouldHave(actual, notSatisfiesCondition, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * Assert that each element of given {@code Iterable} not satisfies the given condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if one or more elements satisfy the given condition.
   */
  public  void assertDoNotHave(AssertionInfo info, Iterable actual, Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      List satisfiesCondition = satisfiesCondition(actual, condition);
      if (!satisfiesCondition.isEmpty())
        throw failures.failure(info, elementsShouldNotHave(actual, satisfiesCondition, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * Assert that there is at least n elements in the actual {@code Iterable} satisfying the given
   * condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param times the minimum number of times the condition should be verified.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if the number of elements satisfying the given condition is < n.
   */
  public  void assertAreAtLeast(AssertionInfo info, Iterable actual, int times,
                                   Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedAtLeastNTimes(actual, times, condition))
        throw failures.failure(info, elementsShouldBeAtLeast(actual, times, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  private  boolean conditionIsSatisfiedAtLeastNTimes(Iterable actual, int n,
                                                        Condition condition) {
    List satisfiesCondition = satisfiesCondition(actual, condition);
    return satisfiesCondition.size() >= n;
  }

  /**
   * Assert that there is at most n elements in the actual {@code Iterable} satisfying the given
   * condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param n the number of times the condition should be at most verified.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if the number of elements satisfying the given condition is > n.
   */
  public  void assertAreAtMost(AssertionInfo info, Iterable actual, int n,
                                  Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedAtMostNTimes(actual, condition, n))
        throw failures.failure(info, elementsShouldBeAtMost(actual, n, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  private  boolean conditionIsSatisfiedAtMostNTimes(Iterable actual, Condition condition,
                                                       int n) {
    List satisfiesCondition = satisfiesCondition(actual, condition);
    return satisfiesCondition.size() <= n;
  }

  /**
   * Verifies that there is exactly n elements in the actual {@code Iterable} satisfying the given
   * condition.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param times the exact number of times the condition should be verified.
   * @param condition the given {@code Condition}.
   * @throws NullPointerException if the given condition is {@code null}.
   * @throws AssertionError if an element cannot be cast to E.
   * @throws AssertionError if the number of elements satisfying the given condition is ≠ n.
   */
  public  void assertAreExactly(AssertionInfo info, Iterable actual, int times,
                                   Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedNTimes(actual, condition, times))
        throw failures.failure(info, elementsShouldBeExactly(actual, times, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  private  boolean conditionIsSatisfiedNTimes(Iterable actual, Condition condition,
                                                 int times) {
    List satisfiesCondition = satisfiesCondition(actual, condition);
    return satisfiesCondition.size() == times;
  }

  /**
   * An alias method of {@link #assertAreAtLeast(AssertionInfo, Iterable, int, Condition)} to provide a richer fluent
   * api (same logic, only error message differs).
   */
  public  void assertHaveAtLeast(AssertionInfo info, Iterable actual, int times,
                                    Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedAtLeastNTimes(actual, times, condition))
        throw failures.failure(info, elementsShouldHaveAtLeast(actual, times, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * An alias method of {@link #assertAreAtMost(AssertionInfo, Iterable, int, Condition)} to provide a richer fluent api
   * (same logic, only error message differs).
   */
  public  void assertHaveAtMost(AssertionInfo info, Iterable actual, int times,
                                   Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedAtMostNTimes(actual, condition, times))
        throw failures.failure(info, elementsShouldHaveAtMost(actual, times, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * An alias method of {@link #assertAreExactly(AssertionInfo, Iterable, int, Condition)} to provide a richer fluent
   * api (same logic, only error message differs).
   */
  public  void assertHaveExactly(AssertionInfo info, Iterable actual, int times,
                                    Condition condition) {
    assertNotNull(info, actual);
    conditions.assertIsNotNull(condition);
    try {
      if (!conditionIsSatisfiedNTimes(actual, condition, times))
        throw failures.failure(info, elementsShouldHaveExactly(actual, times, condition));
    } catch (ClassCastException e) {
      throw failures.failure(info, shouldBeSameGenericBetweenIterableAndCondition(actual, condition));
    }
  }

  /**
   * Asserts that the given {@code Iterable} contains all the elements of the other {@code Iterable}, in any order.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param other the other {@code Iterable}.
   * @throws NullPointerException if {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain all the elements of the other
   *           {@code Iterable}, in any order.
   */
  public void assertContainsAll(AssertionInfo info, Iterable actual, Iterable other) {
    if (other == null) throw iterableToLookForIsNull();
    assertNotNull(info, actual);
    Object[] values = newArrayList(other).toArray();
    assertIterableContainsGivenValues(actual, values, info);
  }

  /**
   * Asserts that the given {@code Iterable} contains exactly the given values and nothing else, in order.
   * 
   * @param info contains information about the assertion.
   * @param actual the given {@code Iterable}.
   * @param values the values that are expected to be in the given {@code Iterable} in order.
   * @throws NullPointerException if the array of values is {@code null}.
   * @throws AssertionError if the given {@code Iterable} is {@code null}.
   * @throws AssertionError if the given {@code Iterable} does not contain the given values or if the given
   *           {@code Iterable} contains values that are not in the given array, in order.
   */
  public void assertContainsExactly(AssertionInfo info, Iterable actual, Object[] values) {
    checkIsNotNull(values);
    assertNotNull(info, actual);
    int actualSize = sizeOf(actual);
    if (values.length != actualSize)
      throw failures.failure(info, shouldHaveSameSize(actual, values, actualSize, values.length, comparisonStrategy));
    assertHasSameSizeAs(info, actual, values); // include check that actual is not null
    List notExpected = asListWithoutDuplicatesAccordingToComparisonStrategy(actual);
    List notFound = containsOnly(notExpected, values);
    if (notExpected.isEmpty() && notFound.isEmpty()) {
      // actual and values have the same elements but are they in the same order.
      int i = 0;
      for (Object elementFromActual : actual) {
        if (!areEqual(elementFromActual, values[i])) {
          throw failures.failure(info, elementsDifferAtIndex(elementFromActual, values[i], i, comparisonStrategy));
        }
        i++;
      }
      return;
    }
    throw failures.failure(info, shouldContainExactly(actual, values, notFound, notExpected, comparisonStrategy));
  }

  public  void assertAllMatch(AssertionInfo info, Iterable actual, Predicate predicate) {
    assertNotNull(info, actual);
    predicates.assertIsNotNull(predicate);
    stream(actual.spliterator(), false).filter(predicate.negate())
                                       .findFirst()
                                       .ifPresent(e -> {
                                         throw failures.failure(info, elementsShouldMatch(actual, e, predicate));
                                       });
  }

  public void assertContainsExactlyInAnyOrder(AssertionInfo info, Iterable actual, Object[] values) {
    checkIsNotNull(values);
    assertNotNull(info, actual);
    List notExpected = newArrayList(actual);
    List notFound = newArrayList(values);

    for (Object value : values) {
      if (iterableContains(notExpected, value)) {
        iterablesRemoveFirst(notExpected, value);
        iterablesRemoveFirst(notFound, value);
      }
    }

    if (notExpected.isEmpty() && notFound.isEmpty()) return; 

    throw failures.failure(info,
                           shouldContainExactlyInAnyOrder(actual, values, notFound, notExpected, comparisonStrategy));
  }

  private void assertNotNull(AssertionInfo info, Iterable actual) {
    Objects.instance().assertNotNull(info, actual);
  }

  private AssertionError actualDoesNotEndWithSequence(AssertionInfo info, Iterable actual, Object[] sequence) {
    return failures.failure(info, shouldEndWith(actual, sequence, comparisonStrategy));
  }

  private  List notSatisfyingCondition(Iterable actual, Condition condition) {
    List notSatisfiesCondition = new LinkedList<>();
    for (E o : actual) {
      if (!condition.matches(o)) notSatisfiesCondition.add(o);
    }
    return notSatisfiesCondition;
  }

  private  List satisfiesCondition(Iterable actual, Condition condition) {
    List satisfiesCondition = new LinkedList<>();
    for (E o : actual) {
      if (condition.matches(o)) satisfiesCondition.add(o);
    }
    return satisfiesCondition;
  }

  static public NullPointerException iterableToLookForIsNull() {
    return new NullPointerException("The iterable to look for should not be null");
  }

  static public IllegalArgumentException iterableToLookForIsEmpty() {
    return new IllegalArgumentException("The iterable to look for should not be empty");
  }

}
    

    

    

            

    

            



    
    






    
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