/*                                                                                                       
 * CalendarDataHandler                                                                                  
 *                                                                                                       
 * Version 1.0                                                                                           
 *                                                                                                       
 * 20070325                                                                                              
 *                                                                                                       
 * Author: Jenny Nordgren                                                                                
 */

/**                                                                                                      
 * CalendarDataHandler sets up a thread that handles the connection to the google API and uploads any
 * events passed to the thread.                                                     
*/

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.*;
import java.io.*;
import com.google.gdata.client.*;
import com.google.gdata.client.calendar.*;
import com.google.gdata.data.*;
import com.google.gdata.data.calendar.*;
import com.google.gdata.data.extensions.*;
import com.google.gdata.util.*;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Date;
import java.util.Calendar;

public class CalendarDataHandler implements Runnable {

    private Thread t = new Thread(this);
    private GCalHelper appWindow;
    private ArrayList<CalendarEventEntry> events;
    private String username = "";
    private String password = "";

/**
* This constructor takes the mother app window, a list of events to be uploaded, and the user credentials for
* authenticating with the calendar service.     
*/

    public CalendarDataHandler(GCalHelper appWindow, ArrayListModel<CalendarEventEntry> events, String username, String password) {
	this.appWindow = appWindow;
	this.events = events;
	this.username = username;
	this.password = password;
	t.start();
    }

/**
*  This is the implementation of the Runnable Interface. A connection is set up, the user is authenticated and
* events are added to the calendar feed. A list of the events that were uploaded are reported back to the
* main thread.    
*/

    public void run() {

	try {
	        	   
    	    // URL-object for handling connection
	       URL feedUrl = new URL("http://www.google.com/calendar/feeds/" + username + "/private/full");
	       CalendarService myService = new CalendarService("Nordgren-GCalHelper-0.1");
	        myService.setUserCredentials(username, password);
           
           //ArrayList for recording which events get uploaded so that they can be reported to the main data model
            ArrayList<CalendarEventEntry> updatedEvents = new ArrayList<CalendarEventEntry>();
            
            //ArrayList with the events in the main data collection that are already uploaded, to avoid duplicate uploads
            ArrayList<CalendarEventEntry> uploaded = appWindow.getUploadedEvents();
            
            Iterator myIterator = events.iterator();
            while (myIterator.hasNext()) {
		          CalendarEventEntry e = (CalendarEventEntry)myIterator.next();
		          if(!uploaded.contains(e)) {
			         CalendarEventEntry insertedEntry = (CalendarEventEntry)myService.insert(feedUrl, e);
			         updatedEvents.add(e);
			     }
    	    }
            //Report back what was uploaded                  
            appWindow.recordUploadedEvents(updatedEvents); 
                
	} //Report any trouble to the user
	catch (MalformedURLException e1) { appWindow.setMessageLabel("URL Exception");}
	catch (ServiceException e4) {appWindow.setMessageLabel("Service problem! Wrong user details or connection problems."); 	}
	catch (IOException e2) { appWindow.setMessageLabel("No internet connection!");}
    }

}