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/*******************************************************************************
 * Copyright 2013-2014 Gengyu Shi
 * 
 * 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.shigengyu.common;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.io.IOUtils;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;

public class ListHashMap implements Iterable>> {

	public static  ListHashMap newListHashMap() {
		return new ListHashMap();
	}

	private final Map> map = new ConcurrentHashMap>();

	public ListHashMap addAll(Iterable values, Function keySelector) {
		for (V value : values) {
			K key = keySelector.apply(value);
			addItem(key, value);
		}
		return this;
	}

	public ListHashMap addItem(K key, V value) {
		if (!map.containsKey(key)) {
			map.put(key, new ArrayList());
		}
		map.get(key).add(value);
		return this;
	}

	public boolean containsItems(String key, V item) {
		return map.containsKey(key) && map.get(key).contains(item);
	}

	public boolean containsKey(String key) {
		return map.containsKey(key);
	}

	public List get(K key) {
		List mutable = getMutable(key);
		if (mutable == null) {
			return null;
		}
		return ImmutableList.copyOf(mutable);
	}

	public List getMutable(K key) {
		return map.get(key);
	}

	@Override
	public Iterator>> iterator() {
		return map.entrySet().iterator();
	}

	public List remove(String key) {
		return map.remove(key);
	}

	public boolean removeItem(String key, V value) {
		if (!map.containsKey(key)) {
			return false;
		}
		return map.get(key).remove(value);
	}

	public int size() {
		return map.size();
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		int count = 0;
		for (Entry> entry : map.entrySet()) {
			sb.append(entry.getKey() + " (" + entry.getKey().hashCode() + ") = " + entry.getValue()
					+ IOUtils.LINE_SEPARATOR);
			++count;

			if (count == 10) {
				sb.append("...");
				return sb.toString();
			}
		}
		return sb.toString();
	}
}