import com.google.gdata.client.Query;
import com.google.gdata.client.calendar.CalendarQuery;
import com.google.gdata.client.calendar.CalendarService;
import com.google.gdata.data.DateTime;
import com.google.gdata.data.Link;
import com.google.gdata.data.PlainTextConstruct;
import com.google.gdata.data.batch.BatchOperationType;
import com.google.gdata.data.batch.BatchStatus;
import com.google.gdata.data.batch.BatchUtils;
import com.google.gdata.data.calendar.CalendarEntry;
import com.google.gdata.data.calendar.CalendarEventEntry;
import com.google.gdata.data.calendar.CalendarEventFeed;
import com.google.gdata.data.calendar.CalendarFeed;
import com.google.gdata.data.calendar.WebContent;
import com.google.gdata.data.extensions.ExtendedProperty;
import com.google.gdata.data.extensions.Recurrence;
import com.google.gdata.data.extensions.Reminder;
import com.google.gdata.data.extensions.Reminder.Method;
import com.google.gdata.data.extensions.When;
import com.google.gdata.util.ServiceException;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.TimeZone;

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;


public class GoogleCalendar extends HttpServlet
{
	private static final String METAFEED_URL_BASE = "http://www.google.com/calendar/feeds/";
	private static final String EVENT_FEED_URL_SUFFIX = "/private/full";
	private static URL metafeedUrl = null;
	private static URL eventFeedUrl = null;

	private static CalendarEventEntry createEvent(CalendarService service,String eventTitle, 
	String eventContent, String recurData, boolean isQuickAdd, WebContent wc) throws ServiceException, IOException 
	{
		CalendarEventEntry myEntry = new CalendarEventEntry();
		myEntry.setTitle(new PlainTextConstruct(eventTitle));
		myEntry.setContent(new PlainTextConstruct(eventContent));
		myEntry.setQuickAdd(isQuickAdd);
		myEntry.setWebContent(wc);
		
		if (recurData == null) 
		{
			Calendar calendar = new GregorianCalendar();
			DateTime startTime = new DateTime(calendar.getTime(), TimeZone.getDefault());
			calendar.add(Calendar.MINUTE, 30);
			DateTime endTime = new DateTime(calendar.getTime(), TimeZone.getDefault());
			When eventTimes = new When();
			eventTimes.setStartTime(startTime);
			eventTimes.setEndTime(endTime);
			myEntry.addTime(eventTimes);
		}
		
		else 
		{
			Recurrence recur = new Recurrence();
			recur.setValue(recurData);
			myEntry.setRecurrence(recur);
		}
		
		return service.insert(eventFeedUrl, myEntry);
	 }

	private static CalendarEventEntry createSingleEvent(CalendarService service,
    String eventTitle, String eventContent) throws ServiceException, IOException 
	{
		return createEvent(service, eventTitle, eventContent, null, false, null);
	}

	private static CalendarEventEntry createQuickAddEvent(CalendarService service, 
	String quickAddContent) throws ServiceException, IOException 
	{
		return createEvent(service, null, quickAddContent, null, true, null);
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
    {
        response.setContentType("text/xml");
        PrintWriter out = response.getWriter();

		String User = "rohit.jain.test@gmail.com";
		String Password = "1234asdf";

		try 
		{
			metafeedUrl = new URL(METAFEED_URL_BASE + User);
			eventFeedUrl = new URL(METAFEED_URL_BASE +User+ EVENT_FEED_URL_SUFFIX);
		}
		catch (MalformedURLException e) 
		{
			System.err.println("Uh oh - you've got an invalid URL.");
			e.printStackTrace();
			return;
		}

		CalendarService myService = new CalendarService("Rohit");

		try
		{
			myService.setUserCredentials(User,Password);

			CalendarEventFeed myFeed = myService.getFeed(eventFeedUrl, CalendarEventFeed.class);

			out.println("<events>");
		
			int count = myFeed.getEntries().size();

			for (int i = 0; i < count; i++)
			{
				CalendarEventEntry entry = myFeed.getEntries().get(i);
				out.print("\t<event title=\""+entry.getTitle().getPlainText()+"\" due=\"");

				List timeList = entry.getTimes();
				for (int j=0; j<timeList.size();j++)
				{
					When eventTime = (When)timeList.get(j);
					DateTime startTime = eventTime.getStartTime();
					
					String startTimeStr = startTime.toUiString();
					out.println(startTimeStr+"\"/>");
				}
			}

			out.println("</events>");
		}
		catch (ServiceException e) 
		{
			System.err.println("The server had a problem handling your request.");
			e.printStackTrace();
		}
    }
}