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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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 org.tinygroup.context.impl;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.tinygroup.context.Context;

public class ContextImpl extends BaseContextImpl implements Context,
		Serializable {
	/**
     *
     */
	private static final long serialVersionUID = -6522200746253638309L;

	private Map subContextMap = new ConcurrentHashMap();
	private Context parent = null;

	public ContextImpl() {

	}

	public ContextImpl(Map map) {
		super.setItemMap(map);
	}

	public Context getParent() {
		return parent;
	}

	public void setParent(Context parent) {
		this.parent = parent;
	}

	public Context createSubContext(String contextName) {
		Context context = new ContextImpl();
		putSubContextAndSetParent(contextName, context);
		return context;
	}

	public Context putSubContext(String contextName, Context context) {
		putSubContextAndSetParent(contextName, context);
		return context;
	}

	/**
	 * 设置儿子环境，但儿子的不设置当前为父亲
	 */
	public void putContext(String contextName, Context context) {
		subContextMap.put(contextName, context);
	}

	private void putSubContextAndSetParent(String contextName, Context context) {
		context.setParent(this);
		subContextMap.put(contextName, context);
	}

	public Context removeSubContext(String contextName) {
		return subContextMap.remove(contextName);
	}

	public Context getSubContext(String contextName) {
		return subContextMap.get(contextName);
	}

	public void clearSubContext() {
		subContextMap.clear();

	}

	public void clear() {
		super.clear();
		clearSubContext();
	}

	public Map getSubContextMap() {
		return subContextMap;
	}

	public  T remove(String contextName, String name) {
		Context subContext = subContextMap.get(contextName);
		if (subContext != null) {
			return (T) subContext.remove(name);
		}
		return null;
	}

	public  T getInSubContext(String contextName, String name) {
		Context subContext = subContextMap.get(contextName);
		if (subContext != null) {
			return (T) subContext.get(name);
		}
		return null;
	}

	public  T put(String contextName, String name, T object) {
		Context subContext = subContextMap.get(contextName);
		if (subContext == null) {
			subContext = createSubContext(contextName);
		}
		subContext.put(name, object);
		return object;
	}

	/**
	 * 改写get方法，使得可以从父环境中查找，同时，也可以从子环境中查找 先找自己，再找子，再找父
	 */
	public  T get(String name) {
		Map nodeMap = new HashMap();
		if (nodeMap.get(this) == null) {
			return (T) findNodeMap(name, this, nodeMap);
		}
		return null;
	}

	protected  T findNodeMap(String name, Context contextNode,
			Map nodeMap) {

		// 如果当前不存在，则查找父亲中有没有
		// 如果已经存在，则返回之
		if (contextNode.getItemMap().containsKey(name)) {
			Object object = contextNode.getItemMap().get(name);
			if (object == null) {
				return null;
			} else {
				return (T) object;
			}
		}

		T result = (T) contextNode.getItemMap().get(name);
		if (result != null) {
			return result;
		} else {
			nodeMap.put(contextNode, "");
		}
		if (!contextNode.getSubContextMap().isEmpty()) {
			for (Context context : contextNode.getSubContextMap().values()) {
				if (nodeMap.get(context) == null) {
					T subResult = findNodeMap(name, context, nodeMap);
					if (subResult != null) {
						return subResult;
					}
				}
			}
		}
		Context theParent = contextNode.getParent();
		if (theParent != null && nodeMap.get(theParent) == null) {
			return (T) findNodeMap(name, theParent, nodeMap);
		}
		return null;
	}

	protected boolean existNodeMap(String name, Context contextNode,
			Map nodeMap) {

		// 如果当前不存在，则查找父亲中有没有
		// 如果已经存在，则返回之
		if (contextNode.getItemMap().containsKey(name)) {
			return true;
		} else {
			nodeMap.put(contextNode, "");
		}

		if (!contextNode.getSubContextMap().isEmpty()) {
			for (Context context : contextNode.getSubContextMap().values()) {
				if (nodeMap.get(context) == null) {
					boolean exist = existNodeMap(name, context, nodeMap);
					if (exist) {
						return true;
					}
				}
			}
		}
		Context theParent = contextNode.getParent();
		if (theParent != null && nodeMap.get(theParent) == null) {
			return existNodeMap(name, theParent, nodeMap);
		}
		return false;
	}
	protected Context containNodeMap(String name, Context contextNode,
								   Map nodeMap) {

		// 如果当前不存在，则查找父亲中有没有
		// 如果已经存在，则返回之
		if (contextNode.getItemMap().containsKey(name)) {
			return contextNode;
		} else {
			nodeMap.put(contextNode, "");
		}

		if (!contextNode.getSubContextMap().isEmpty()) {
			for (Context context : contextNode.getSubContextMap().values()) {
				if (nodeMap.get(context) == null) {
					Context con = containNodeMap(name, context, nodeMap);
					if (con!=null) {
						return con;
					}
				}
			}
		}
		Context theParent = contextNode.getParent();
		if (theParent != null && nodeMap.get(theParent) == null) {
			return containNodeMap(name, theParent, nodeMap);
		}
		return null;
	}

	public boolean renameKey(String key, String newKey) {
		Map nodeMap = new HashMap();
		if (nodeMap.get(this) == null) {
			return renameKeyNodeMap(key, newKey, this, nodeMap);
		}
		return false;
	}

	protected boolean renameKeyNodeMap(String key, String newKey,
			Context contextNode, Map nodeMap) {
		boolean renamed = renameKeyOfSuper(key, newKey, contextNode);
		Context theParent = contextNode.getParent();
		if (renamed) {
			return true;
		} else {
			nodeMap.put(contextNode, "");
		}
		if (!contextNode.getSubContextMap().isEmpty()) {
			for (Context context : contextNode.getSubContextMap().values()) {
				if (nodeMap.get(context) == null) {
					renamed = renameKeyNodeMap(key, newKey, context, nodeMap);
					if (renamed) {
						return true;
					}
				}
			}
		}
		if (theParent != null && nodeMap.get(theParent) == null) {
			renamed = renameKeyNodeMap(key, newKey, theParent, nodeMap);
			if (renamed) {
				return true;
			}
		}
		return false;
	}

	private boolean renameKeyOfSuper(String key, String newKey, Context context) {
		Map itemMap = context.getItemMap();
		if (itemMap.containsKey(key)) {
			itemMap.put(newKey, itemMap.get(key));
			itemMap.remove(key);
			return true;
		}
		return false;
	}

	public boolean exist(String name) {
		Map nodeMap = new HashMap();
		return existNodeMap(name, this, nodeMap);

	}

	public Context contain(String name) {
		Map nodeMap = new HashMap();
		return containNodeMap(name, this, nodeMap);

	}
	public  Map getItemMap() {
		return super.getItemMap();
	}

	public Map getTotalItemMap() {
		Map map = new HashMap();
		for(Context subContext:subContextMap.values()){
			map.putAll(subContext.getItemMap());
		}
		map.putAll(getItemMap());
		return map;
	}

}