/*
 * NotificationHelper.java
 * 
 * Copyright 2012 Jonathan Hasenzahl, James Celona, Dhimitraq Jorgji
 * 
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package edu.worcester.cs499summer2012.service;

import java.util.Calendar;
import java.util.GregorianCalendar;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Build;
import android.preference.PreferenceManager;
import android.support.v4.app.NotificationCompat;
import android.text.format.DateFormat;
import edu.worcester.cs499summer2012.R;
import edu.worcester.cs499summer2012.activity.SettingsActivity;
import edu.worcester.cs499summer2012.activity.ViewTaskActivity;
import edu.worcester.cs499summer2012.task.Task;

/**
 * Creates Notifications using NotificationCompat to allow for
 * comparability though different API levels
 * 
 * @author Dhimitraq Jorgji
 *
 */
public class NotificationHelper{
	/**
	 * Basic Text Notification for Task Butler, using NotificationCompat
	 * @param context 
	 * @param id id of task, call task.getID() and pass it to this parameter
	 */
	public void sendBasicNotification(Context context, Task task) {
		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
		boolean vibrate = prefs.getBoolean(SettingsActivity.VIBRATE_ON_ALARM, true);
		int alarmInterval;
		int alarmUnits;
		
		if (task.hasFinalDateDue()) {
			alarmInterval = Integer.parseInt(prefs.getString(SettingsActivity.ALARM_TIME, SettingsActivity.DEFAULT_ALARM_TIME));
			alarmUnits = Calendar.MINUTE;
		} else {
			alarmInterval = Integer.parseInt(prefs.getString(SettingsActivity.REMINDER_TIME, SettingsActivity.DEFAULT_REMINDER_TIME));
			alarmUnits = Calendar.HOUR_OF_DAY;
		}
		
		Calendar next_reminder = GregorianCalendar.getInstance();
		next_reminder.add(alarmUnits, alarmInterval);
		
		NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
			.setAutoCancel(true)
			.setContentIntent(getPendingIntent(context, task.getID()))
			.setContentInfo(Task.PRIORITY_LABELS[task.getPriority()])
			.setContentTitle(task.getName())
			.setContentText(DateFormat.format("'Next reminder at' h:mmaa", next_reminder))
			.setDefaults(vibrate ? Notification.DEFAULT_ALL : Notification.DEFAULT_SOUND|Notification.DEFAULT_LIGHTS)
			.setSmallIcon(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ? 
					R.drawable.ic_notification : R.drawable.ic_notification_deprecated)
			.setTicker(task.getName())
			.setWhen(System.currentTimeMillis());
		@SuppressWarnings("deprecation")
		Notification notification = builder.getNotification();
		NotificationManager notificationManager = getNotificationManager(context);
		notificationManager.notify(task.getID(), notification);
	}
	/**
	 * Basic Text Notification with Ongoing flag enabled for Task Butler, using NotificationCompat
	 * @param context 
	 * @param id id of task, call task.getID() and pass it to this parameter
	 * @deprecated Use sendBasicNotification for all notifications
	 */
	public void sendPersistentNotification(Context context, Task task) {
		NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
			.setContentText(task.getNotes())
			.setContentTitle(task.getName())
			.setSmallIcon(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ? 
					R.drawable.ic_notification : R.drawable.ic_notification_deprecated)
			.setAutoCancel(true)
			.setContentIntent(getPendingIntent(context,task.getID()))
			.setWhen(System.currentTimeMillis())
			.setOngoing(true)
			.setDefaults(Notification.DEFAULT_ALL);
		Notification notification = builder.getNotification();
		NotificationManager notificationManager = getNotificationManager(context);
		notificationManager.notify(task.getID(), notification);
	}
	//get a PendingIntent
	PendingIntent getPendingIntent(Context context, int id) {
		Intent intent =  new Intent(context, ViewTaskActivity.class)
			.putExtra(Task.EXTRA_TASK_ID, id);
		return PendingIntent.getActivity(context, id, intent, 0);
	}
	//get a NotificationManager
	NotificationManager getNotificationManager(Context context) {
		return (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
	}
	
	/**
	 * Cancels an existing notification, if user modified the task. Make the
	 * actual call from TaskAlarm.cancelNotification(Context, int)
	 * @param context
	 * @param taskID
	 */
	public void cancelNotification(Context context, int taskID) {
		NotificationManager notificationManager = getNotificationManager(context);
		notificationManager.cancel(taskID);
	}

}
