package com.smtservlet.util;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class SMTScriptObject 
{
	private static Map<String, Method> _method = null;
	
	private static synchronized Map<String, Method> getMethodMap(Object oo)
	{
		if(_method == null)
		{
			_method = new HashMap<String, Method>();
			
			for(Method method : oo.getClass().getDeclaredMethods())
			{
				_method.put(method.getName(), method);
			}
		}
		
		return _method;
	}
	
	/**
	 * 从js对象中获取子对象，如果获取不到则抛出异常
	 * 
	 * @param jsonConfig - js对象
	 * @param key - 要获取的key
	 * @return - 返回获取后的值
	 */
	@SuppressWarnings("rawtypes")
	public static Object getScriptObject(Object jsonConfig, String key) throws Exception
	{
		if(jsonConfig instanceof Map)
		{
			if(!((Map)jsonConfig).containsKey(key))
				throw new Exception(String.format("json [%s] can't find key [%s]", jsonConfig.toString(), key));
			return ((Map)jsonConfig).get(key);
		}
		else if(!SMTScriptObject.isScriptObjectMirror(jsonConfig))
			throw new Exception(String.format("object -->[%s] is not ScriptObjectMirror", jsonConfig.getClass().toString()));
		
		Object json = SMTScriptObject.get(jsonConfig, key);
		if(json == null)
			throw new Exception(String.format("json [%s] can't find key [%s]", jsonConfig.toString(), key));
		
		return json;
	}
	
	/**
	 * 从js对象中获取子对象，如果获取不到则返回defValue
	 * 
	 * @param jsonConfig - js对象
	 * @param key - 要获取的key
	 * @param defValue - 缺省值
	 * @return - 返回获取后的值
	 */
	@SuppressWarnings("rawtypes")
	public static Object getScriptObject(Object jsonConfig, String key, Object defValue) throws Exception
	{
		if(jsonConfig instanceof Map)
		{
			if(!((Map)jsonConfig).containsKey(key))
				return defValue;
			return ((Map)jsonConfig).get(key);
		}
		if(!SMTScriptObject.isScriptObjectMirror(jsonConfig))
			throw new Exception(String.format("object -->[%s] is not ScriptObjectMirror", jsonConfig.getClass().toString()));
		Object json = SMTScriptObject.get(jsonConfig, key);
		if(json == null)
			return defValue;
		
		return json;
	}

	
	@SuppressWarnings("unchecked")
	public static Set<Map.Entry<String, Object>> entrySet(Object oo) throws Exception
	{
		Object ret = SMTScriptObject.getMethodMap(oo).get("entrySet").invoke(oo);
		return (Set<Entry<String, Object>>) ret;
	}
	
	public static Object call(Object oo, Object...arg) throws Exception
	{
		return SMTScriptObject.getMethodMap(oo).get("call").invoke(oo, null, arg);
	}
	
	public static boolean isScriptObjectMirror(Object oo)
	{
		return oo.getClass().getName().equals("jdk.nashorn.api.scripting.ScriptObjectMirror");
	}
	
	public static Object get(Object oo, Object key) throws Exception
	{
		return SMTScriptObject.getMethodMap(oo).get("get").invoke(oo, key);
	}
	
	public static boolean isFunction(Object oo) throws Exception
	{
		return (Boolean) SMTScriptObject.getMethodMap(oo).get("isFunction").invoke(oo);
	}
	
}