/*-
 * ============LICENSE_START=======================================================
 * PROJECT
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.dcae.commonFunction;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;

import java.util.Map.Entry;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonIOException;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CustomExceptionLoader {

    public static HashMap<String, JsonArray> map = null;
    private static final Logger log = LoggerFactory.getLogger ( CustomExceptionLoader.class );
    //static private final VESLogger log = VESLogger.getLogger(CustomExceptionLoader.class, VESLogger.VES_AGENT);
    
    //For standalone test
    //LoadMap Invoked from servletSetup
    /*
	public static void main(String[] args) {

		System.out.println("CustomExceptionLoader.main --> Arguments -- ExceptionConfig file: " + args[0] + "StatusCode:" + args[1]+ " Error Msg:" + args[2]);
		CommonStartup.exceptionConfig = args[0];
		
		//Read the Custom exception JSON file into map
	    LoadMap();
	    System.out.println("CustomExceptionLoader.main --> Map info post LoadMap:" + map);
	   
	     String[] str= LookupMap(args[1],args[2]);
			if (! (str==null)) {
			System.out.println("CustomExceptionLoader.main --> Return from lookup function" + str[0] + "value:" + str[1]);	
		}
	    
	}
	*/
	
	public static void LoadMap () {
		
		 map = new HashMap<String, JsonArray>();
		 FileReader fr = null;
		 try {
			 	JsonElement root = null;
			 	fr = new FileReader(CommonStartup.exceptionConfig);
			 	root = new JsonParser().parse(fr);
			 	JsonObject jsonObject = root.getAsJsonObject().get("code").getAsJsonObject();

				for (Entry<String, JsonElement> entry : jsonObject.entrySet()) {
				     map.put(entry.getKey(), (JsonArray) entry.getValue());
				}
				
				log.debug("CustomExceptionLoader.LoadMap --> Map loaded - " + map);
			} catch (JsonIOException e) {
				e.printStackTrace();
			} catch (JsonSyntaxException e) {
				e.printStackTrace();
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}
		 	finally {
		    	if (fr != null) {
		    		try {
		    				fr.close();
		    			} catch (IOException e) {
		    				log.error("Error closing file reader stream : " +e.toString());
		    			}
		    	}
		    }
	}

	public static String[] LookupMap (String error, String errormsg) {
		 
		 String[] retarray = null;
		 
		 log.debug("CustomExceptionLoader.LookupMap -->" + " HTTP StatusCode:" + error + " Msg:" + errormsg);
		 try{
			 
			 JsonArray jarray = map.get(error);
			  for (int i = 0; i < jarray.size(); i++) {
			    	  
			     JsonElement val = jarray.get(i).getAsJsonObject().get("Reason");
			     JsonArray ec = (JsonArray) jarray.get(i).getAsJsonObject().get("ErrorCode");
				 log.trace("CustomExceptionLoader.LookupMap Parameter -> Error msg : " + errormsg + " Reason text being matched:" + val);			
				 if (errormsg.contains(val.toString().replace("\"", ""))){
					 log.trace("CustomExceptionLoader.LookupMap Successful! Exception matched to error message StatusCode:" + ec.get(0).toString() + "ErrorMessage:" + ec.get(1).toString());
					 retarray = new String[2];
					 retarray[0]=ec.get(0).toString();
					 retarray[1]=ec.get(1).toString();
					 return retarray;
				 }
			    }
  
		 }
		 catch (Exception e)
		 {
			 System.out.println(e.getMessage());
		 }
	        
		 return retarray;
	}

}