/*-
 * ============LICENSE_START=======================================================
 * openECOMP : SDN-C
 * ================================================================================
 * 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.sdnc.dmaapclient;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;

import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;


public class SdncFlatJsonDmaapConsumer extends SdncDmaapConsumer {
	
	private static final Logger LOG = LoggerFactory
			.getLogger(SdncFlatJsonDmaapConsumer.class);
	
	private static final String UEBLISTENERROOT = "UEBLISTENERROOT";
	private static final String SDNC_ENDPOINT = "SDNC.endpoint";
	

	
	@Override
	public void processMsg(String msg) throws InvalidMessageException {
		
		processMsg(msg, null);
	}
	
	public void processMsg(String msg, String mapDirName) throws InvalidMessageException {
		
		if (msg == null) {
			throw new InvalidMessageException("Null message");
		}
		
		ObjectMapper oMapper = new ObjectMapper();
		JsonNode instarRootNode = null;
		ObjectNode sdncRootNode = null;

		String instarMsgName = null;
		
		try {
			 instarRootNode = oMapper.readTree(msg);
		} catch (Exception e) {
			throw new InvalidMessageException("Cannot parse json object", e);
		}
		
		Iterator<Map.Entry<String, JsonNode>> instarFields = instarRootNode.fields();
		
		while (instarFields.hasNext()) {
			Map.Entry<String, JsonNode> entry = instarFields.next();
			
			instarMsgName = entry.getKey();
			instarRootNode = entry.getValue();
			break;
		}

		Map<String,String> fieldMap = loadMap(instarMsgName, mapDirName);
		
		if (fieldMap == null) {
			throw new InvalidMessageException("Unable to process message - cannot load field mappings");
		}
		
		if (!fieldMap.containsKey(SDNC_ENDPOINT)) {
			throw new InvalidMessageException("No SDNC endpoint known for message "+instarMsgName);
		}
		
		String sdncEndpoint = fieldMap.get(SDNC_ENDPOINT);
		
		sdncRootNode = oMapper.createObjectNode();
		ObjectNode inputNode = oMapper.createObjectNode();
		
		
		for (String fromField : fieldMap.keySet()) {
			
			if (!SDNC_ENDPOINT.equals(fromField)) {
				JsonNode curNode = instarRootNode.get(fromField);
				if (curNode != null) {
					String fromValue = curNode.textValue();

					inputNode.put(fieldMap.get(fromField), fromValue);
				}
			}
		}
		sdncRootNode.put("input", inputNode);
		
		try {
			String rpcMsgbody = oMapper.writeValueAsString(sdncRootNode);
			String odlUrlBase = getProperty("sdnc.odl.url-base");
			String odlUser = getProperty("sdnc.odl.user");
			String odlPassword = getProperty("sdnc.odl.password");
			
			if ((odlUrlBase != null) && (odlUrlBase.length() > 0)) {
				SdncOdlConnection conn = SdncOdlConnection.newInstance(odlUrlBase + sdncEndpoint, odlUser, odlPassword);
			
				conn.send("POST", "application/json", rpcMsgbody);
			} else {
				LOG.info("POST message body would be:\n"+rpcMsgbody);
			}
		} catch (Exception e) {
			
		}
		
	}

	private Map<String,String> loadMap(String msgType, String mapDirName) {
		Map<String, String> results = new HashMap<String, String>();
		
		
		if (mapDirName == null) {
			String rootdir = System.getenv(UEBLISTENERROOT);
		
			if ((rootdir == null) || (rootdir.length() == 0)) {
				rootdir = "/opt/app/ueb-listener";
			}
		
			mapDirName = rootdir + "/lib";

		}
		
		String mapFilename = mapDirName + "/" + msgType + ".map";
		
		File mapFile = new File(mapFilename);
		
		if (!mapFile.canRead()) {
			LOG.error("Cannot read map file ("+mapFilename+")");
			return(null);
		}
		
		try {
			BufferedReader mapReader = new BufferedReader(new FileReader(mapFile));
			
			String curLine = null;
			
			while ((curLine = mapReader.readLine()) != null) {
				curLine = curLine.trim();
				
				if ((curLine.length() > 0) && (!curLine.startsWith("#"))) {
					
					if (curLine.contains("=>")) {
						String[] entry = curLine.split("=>");
						if (entry.length == 2) {
							results.put(entry[0].trim(), entry[1].trim());
						}
					}
				}
			}
			mapReader.close();
		} catch (Exception e) {
			LOG.error("Caught exception reading map "+mapFilename, e);
			return(null);
		}
		
		return(results);
	}
	
	

}