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/*
 * Copyright (C) 2012 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.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;

import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.annotation.Nullable;

/**
 * A skeleton {@code Multimap} implementation, not necessarily in terms of a {@code Map}.
 * 
 * @author Louis Wasserman
 */
@GwtCompatible
abstract class AbstractMultimap implements Multimap {
  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    for (Collection collection : asMap().values()) {
      if (collection.contains(value)) {
        return true;
      }
    }

    return false;
  }

  @Override
  public boolean containsEntry(@Nullable Object key, @Nullable Object value) {
    Collection collection = asMap().get(key);
    return collection != null && collection.contains(value);
  }
  
  @Override
  public boolean remove(@Nullable Object key, @Nullable Object value) {
    Collection collection = asMap().get(key);
    return collection != null && collection.remove(value);
  }

  @Override
  public boolean put(@Nullable K key, @Nullable V value) {
    return get(key).add(value);
  }

  @Override
  public boolean putAll(@Nullable K key, Iterable values) {
    checkNotNull(values);
    // make sure we only call values.iterator() once
    // and we only call get(key) if values is nonempty
    if (values instanceof Collection) {
      Collection valueCollection = (Collection) values;
      return !valueCollection.isEmpty() && get(key).addAll(valueCollection);
    } else {
      Iterator valueItr = values.iterator();
      return valueItr.hasNext() && Iterators.addAll(get(key), valueItr);
    }
  }

  @Override
  public boolean putAll(Multimap multimap) {
    boolean changed = false;
    for (Map.Entry entry : multimap.entries()) {
      changed |= put(entry.getKey(), entry.getValue());
    }
    return changed;
  }

  @Override
  public Collection replaceValues(@Nullable K key, Iterable values) {
    checkNotNull(values);
    Collection result = removeAll(key);
    putAll(key, values);
    return result;
  }
  
  private transient Collection> entries;

  @Override
  public Collection> entries() {
    Collection> result = entries;
    return (result == null) ? entries = createEntries() : result;
  }
  
  Collection> createEntries() {
    if (this instanceof SetMultimap) {
      return new EntrySet();
    } else {
      return new Entries();
    }
  }
  
  private class Entries extends Multimaps.Entries {
    @Override
    Multimap multimap() {
      return AbstractMultimap.this;
    }

    @Override
    public Iterator> iterator() {
      return entryIterator();
    }
  }
  
  private class EntrySet extends Entries implements Set> {
    @Override
    public int hashCode() {
      return Sets.hashCodeImpl(this);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return Sets.equalsImpl(this, obj);
    }    
  }
  
  abstract Iterator> entryIterator();

  private transient Set keySet;

  @Override
  public Set keySet() {
    Set result = keySet;
    return (result == null) ? keySet = createKeySet() : result;
  }

  Set createKeySet() {
    return new Maps.KeySet>(asMap());
  }
  
  private transient Multiset keys;
  
  @Override
  public Multiset keys() {
    Multiset result = keys;
    return (result == null) ? keys = createKeys() : result;
  }
  
  Multiset createKeys() {
    return new Multimaps.Keys(this);
  }
  
  private transient Collection values;
  
  @Override
  public Collection values() {
    Collection result = values;
    return (result == null) ? values = createValues() : result;
  }
  
  Collection createValues() {
    return new Values();
  }

  class Values extends AbstractCollection {
    @Override public Iterator iterator() {
      return valueIterator();
    }

    @Override public int size() {
      return AbstractMultimap.this.size();
    }

    @Override public boolean contains(@Nullable Object o) {
      return AbstractMultimap.this.containsValue(o);
    }

    @Override public void clear() {
      AbstractMultimap.this.clear();
    }
  }
  
  Iterator valueIterator() {
    return Maps.valueIterator(entries().iterator());
  }
  
  private transient Map> asMap;
  
  @Override
  public Map> asMap() {
    Map> result = asMap;
    return (result == null) ? asMap = createAsMap() : result;
  }
  
  abstract Map> createAsMap();

  // Comparison and hashing

  @Override public boolean equals(@Nullable Object object) {
    return Multimaps.equalsImpl(this, object);
  }

  /**
   * Returns the hash code for this multimap.
   *
   * The hash code of a multimap is defined as the hash code of the map view,
   * as returned by {@link Multimap#asMap}.
   *
   * @see Map#hashCode
   */
  @Override public int hashCode() {
    return asMap().hashCode();
  }

  /**
   * Returns a string representation of the multimap, generated by calling
   * {@code toString} on the map returned by {@link Multimap#asMap}.
   *
   * @return a string representation of the multimap
   */
  @Override
  public String toString() {
    return asMap().toString();
  }
}