import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.app.Service;

import android.content.Intent;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.os.Messenger;

import android.os.RemoteException;

import android.util.Log;

import android.widget.RemoteViews;

public class DownloadService extends Service {

	private final static String URL = "http://www.xelification.com/tmp/data.zip";

	public static final int MSG_CANCEL = 0;

	public static final int MSG_REGISTER_CLIENT = 1;

	public static final int MSG_UNREGISTER_CLIENT = 2;

	public static final int NOTIFICATION_PROCESSING = 0;

	public static final int NOTIFICATION_DONE = 1;

	private DownloadAsyncTask downloadTask;

	private final Messenger messenger = new Messenger(new DownloadHandler());

	private NotificationManager nM;

	private RemoteViews contentView;

	private Notification notification;

	private ArrayList<Messenger> clientList = new ArrayList<Messenger>();

	private Message onRegisterMessage = null;

	class DownloadHandler extends Handler{

		public void handleMessage(Message msg){

			switch(msg.what){

			case MSG_CANCEL:

				downloadTask.cancel(false);

				break;

			case MSG_REGISTER_CLIENT:

				clientList.add(msg.replyTo);

				if(onRegisterMessage != null){

					try {

						msg.replyTo.send(Message.obtain(onRegisterMessage));

					} catch (RemoteException e) {

						e.printStackTrace();

					}

				}

				break;

			case MSG_UNREGISTER_CLIENT:

				clientList.remove(msg.replyTo);

				break;

			}

		}

	}

	public final static int TASKID_START = 0;

	public final static int TASKID_CANCEL = 1;

	public int onStartCommand(Intent intent, int flags, int startId){

		switch(intent.getIntExtra("taskID", TASKID_START)){

		case TASKID_START:

			nM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

			notification = new Notification(R.drawable.statusbar, getString(R.string.notification_title), System.currentTimeMillis());

			//notification.flags |= Notification.FLAG_ONGOING_EVENT;// | Notification.FLAG_NO_CLEAR | Notification.FLAG_FOREGROUND_SERVICE;

			notification.flags |= Notification.FLAG_ONGOING_EVENT;

			contentView = new RemoteViews(getPackageName(), R.layout.notification);

			contentView.setProgressBar(R.id.notification_progress, 100, 34, false);

			notification.contentView = contentView;

			PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, DownloadActivity.class), Intent.FLAG_ACTIVITY_NEW_TASK);

			notification.contentIntent = contentIntent;

			//nM.notify(NOTIFICATION_PROCESSING, notification);

			startForeground(NOTIFICATION_PROCESSING, notification);

			if(downloadTask == null){

				downloadTask = new DownloadAsyncTask(this);

			}	

			break;

		case TASKID_CANCEL:

			downloadTask.cancel(false);

			stopService();

			break;

		}		

		return 0;

	}

	public void onDestroy(){

		Log.e("bla", "onDestroy");

		downloadTask.cancel(false);	

	}

	public IBinder onBind(Intent intent) {

		return messenger.getBinder();

	}

	/*

	 * Thread safe method to let clients know the processing is starting and will process int max kbytes

	 * 

	 */

	public void start(int max){

		onRegisterMessage = Message.obtain(null, DownloadActivity.MSG_START, max, -1);

		sendMessageToClients(onRegisterMessage);

	}

	public void update(int progress, int max, String fileName){

		progress = (progress/1024);

		updateNotification(progress, max, fileName);

		sendMessageToClients(Message.obtain(null, DownloadActivity.MSG_UPDATE, progress, max, fileName));

	}

	public void done(boolean succesful){

		sendMessageToClients(Message.obtain(null, DownloadActivity.MSG_DONE));

		stopService();//stopService clears all notifications and thus must be called before we show the ready notification

		showDoneNotification();

	}

	private void stopService(){

		nM.cancelAll();

		stopForeground(true);

		stopSelf();

	}

	private void updateNotification(int progress, int max, String fileName){

		contentView.setProgressBar(R.id.notification_progress, max, progress, false);

		contentView.setTextViewText(R.id.progressbar_sub, String.format("%dkb/%dkb (Compressed sizes)", progress, max));

		nM.notify(NOTIFICATION_PROCESSING, notification);

	}

	private void showDoneNotification(){

		nM.cancelAll();

		stopForeground(true);

		String title = getString(R.string.notification_title);

		notification = new Notification(R.drawable.icon, title, System.currentTimeMillis());

		notification.flags |= Notification.FLAG_AUTO_CANCEL;

		PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), Intent.FLAG_ACTIVITY_NEW_TASK);

		notification.setLatestEventInfo(this, title, getString(R.string.notification_done), contentIntent);

		nM.notify(NOTIFICATION_DONE, notification);

	}	

	private void sendMessageToClients(Message msg){

		for(Messenger m : clientList){

			try {

				m.send(Message.obtain(msg));

			} catch (RemoteException e) {}//TODO should we catch this properly?

		}

	}

}