/* TweetTracker. Copyright (c) Arizona Board of Regents on behalf of Arizona State University
 * @author shamanth
 */
package Chapter2.Location;

import Chapter2.support.Location;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONArray;
import org.json.JSONException;

public class LocationTranslationExample
{

      /**
        * Translates a location string to coordinates using the database or Nominatim Service
        * @param loc
        * @return
        */
   public Location TranslateLoc(String loc)
   {
        if(loc!=null&&!loc.isEmpty())
        {
            String encodedLoc="";
            try {
                //Step 1: Encode the location name
                 encodedLoc = URLEncoder.encode(loc, "UTF-8");
            } catch (UnsupportedEncodingException ex) {
                Logger.getLogger(LocationTranslationExample.class.getName()).log(Level.SEVERE, null, ex);
            }
             //Step 2: Create a get request to MapQuest API with the name of the location
            String url= "http://open.mapquestapi.com/nominatim/v1/search?q="+encodedLoc+"&format=json";
            String page = ReadHTML(url);
            if(page!=null)
            {
                try{
                    JSONArray results = new JSONArray(page);
                   if(results.length()>0)
                    {
                       //Step 3: Read and extract the coordinates of the location as a JSONObject
                        Location loca = new Location(results.getJSONObject(0).getDouble("lat"),results.getJSONObject(0).getDouble("lon"));
                        return loca;
                    }
                }catch(JSONException ex)
                {
                    Logger.getLogger(LocationTranslationExample.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        return null;
  }

    /**
     * Extracts the html content of a URL
     * @param url
     * @return html page
     */
    public String ReadHTML(String url)
    {
        URLConnection conn = null;
        URL theURL = null;
        try
        {
                theURL = new URL(url);
        }
        catch ( MalformedURLException e)
        {
                System.out.println("Bad URL: " + theURL);
                return null;
        }
        String page = "";
        try
        {
            conn = theURL.openConnection();
            HttpURLConnection huc = (HttpURLConnection) conn;
            conn.setConnectTimeout(2000);
            huc.setRequestProperty("User-Agent", "Mozilla/4.5");
            //Set your email address in the request so MapQuest knows how to reach you in the event of problems
            huc.setRequestProperty("Email", "twitterdataanalytics@gmail.com");
            if(huc.getResponseCode()>=400&&huc.getResponseCode()<=404)
            {
                 return null;
            }
            conn.connect();
            BufferedReader bRead = new BufferedReader(new InputStreamReader((InputStream) conn.getContent()));
            String temp=null;
             while( (temp= bRead.readLine())!=null)
              {
                  page = page+"\n"+temp;
              }
              bRead.close();
        }
        catch (IOException e) {
                //System.out.print("ReadHTML IO Error:" + e.getMessage()+" \n");
                return null;
        }
	return page;
    }

    public static void main(String[] args)
    {
        LocationTranslationExample lte = new LocationTranslationExample();
        if(args!=null)
        {
            if(args.length>0)
            {
                for(int i=0;i<args.length;i++)
                {
                    System.out.println(lte.TranslateLoc(args[i]).toString());
                }
            }
        }
    }
}