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/**
* Global Sensor Networks (GSN) Source Code
* Copyright (c) 2006-2016, Ecole Polytechnique Federale de Lausanne (EPFL)
* 
* This file is part of GSN.
* 
* GSN is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* GSN is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* 
* You should have received a copy of the GNU General Public License
* along with GSN.  If not, see .
* 
* File: src/ch/epfl/gsn/wrappers/HttpGetAndroidWrapper.java
*
* @author Sofiane Sarni
*
*/

/*******************************************************************************
 * Copyright 2012 Colin Cachia
 * 
 * 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 ch.epfl.gsn.wrappers;

import org.w3c.dom.CharacterData;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import ch.epfl.gsn.beans.AddressBean;
import ch.epfl.gsn.beans.DataField;
import ch.epfl.gsn.beans.DataTypes;
import ch.epfl.gsn.beans.StreamElement;
import ch.epfl.gsn.utils.ParamParser;
import ch.epfl.gsn.wrappers.AbstractWrapper;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.Serializable;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.slf4j.LoggerFactory;
import org.slf4j.Logger;

public class HttpGetAndroidWrapper extends AbstractWrapper {
   
   private int                      DEFAULT_RATE       = 2000;
   
   private static int               threadCounter      = 0;
   
   private final transient Logger   logger             = LoggerFactory.getLogger( HttpGetAndroidWrapper.class );
   
   private static String                   urlPath, Longitude, Latitude;
   
   private HttpURLConnection httpURLConnection;
   
   private URL url;
   
  private AddressBean              addressBean;
   
   private String                   inputRate;
   
   private static final String       FIELD_NAME_LONG                       = "Longitude";
   
   private static final String       FIELD_NAME_LAT 						= "Latitude";
      
   private static final String [ ]   FIELD_NAMES                           = new String [ ] { FIELD_NAME_LONG , FIELD_NAME_LAT };
   
   
   private int                      rate;
   
   //private transient final DataField [] outputStructure = new  DataField [] { new DataField( "longitude" , "Double" , "Longitude Data from Network-Connected Android Smartphone." ), new DataField( "latitude" , "Double" , "Latitude Data from Network-Connected Android Smartphone." ) };
  
   /**
    * From XML file it needs the followings :
    * 
    * url The full url for retriving the binary data.
    * rate The interval in msec for updating/asking for new information.
    * mime Type of the binary data.
    * 
    */
   
   public boolean initialize (  ) {
      this.addressBean =getActiveAddressBean( );
      urlPath = this.addressBean.getPredicateValue( "url" );
      try 
	  {
		url = new URL(urlPath);
	  } 
		catch (MalformedURLException e) 
	  {
		logger.error("Loading the http android wrapper failed : "+e.getMessage(),e);
		return false;
	  }
      
	  inputRate = this.addressBean.getPredicateValue( "rate" );
      if ( inputRate == null || inputRate.trim( ).length( ) == 0 ) rate = DEFAULT_RATE;
      else
         rate = Integer.parseInt( inputRate );
      logger.debug( "AndroidWrapper is now running @" + rate + " Rate." );
      return true;
   }
   
   public void run ( ) {
   
      while ( isActive( ) ) {
    	
		parseXML();
		
	  }
      
   }
   
   public String getWrapperName() {
    return "Http Android Receiver";
}
   
   public void dispose (  ) {
      threadCounter--;
   }
   
   public  DataField[] getOutputFormat ( ) {
      
		DataField[] outputFormat = new DataField[2];
		outputFormat[0] = new DataField("Longitude", "Double",
		"Longitude value from Android Smartphone");
		outputFormat[1] = new DataField("Latitude", "Double",
		"Latitude value from Android Smartphone");
		return outputFormat;

   }
   
   private void parseXML() 
	{
		URL url;
		
		try 
		{
			url = new URL(urlPath);
			URLConnection conn = url.openConnection();

			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document doc = builder.parse(conn.getInputStream());
	        
	        NodeList nodes = doc.getElementsByTagName("stream-element");

	        for (int i = 0; i < nodes.getLength(); i++) 
	        {
	            Element element = (Element) nodes.item(i);

	            NodeList Long = element.getElementsByTagName("long");
	            Element line = (Element) Long.item(0);
	            Longitude = getCharacterDataFromElement(line);

	            NodeList Lat = element.getElementsByTagName("lat");
	            line = (Element) Lat.item(0);
	            Latitude = getCharacterDataFromElement(line);
	         }

				StreamElement streamElement = new StreamElement( FIELD_NAMES , new Byte [ ] { DataTypes.DOUBLE , DataTypes.DOUBLE} , new Serializable [ ] { Double.parseDouble(Longitude) , Double.parseDouble(Latitude) } , System.currentTimeMillis( ) );
				postStreamElement( streamElement );
	        
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		}
	}
   
   public static String getCharacterDataFromElement(Element e) 
	{
		    Node child = e.getFirstChild();
		    if (child instanceof CharacterData) {
		       CharacterData cd = (CharacterData) child;
		       return cd.getData();
		    }
		    return "?";
	 }
   
}