package de.tudarmstadt.informatik.hostage;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;

import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.net.ConnectivityManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Binder;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.TaskStackBuilder;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.widget.Toast;
import de.tudarmstadt.informatik.hostage.commons.HelperUtils;
import de.tudarmstadt.informatik.hostage.logging.MyLocationManager;
import de.tudarmstadt.informatik.hostage.logging.UglyDbHelper;
import de.tudarmstadt.informatik.hostage.protocol.Protocol;
import de.tudarmstadt.informatik.hostage.protocol.ProtocolSettings;
import de.tudarmstadt.informatik.hostage.ui.MainActivity;

/**
 * Background service running as long as at least one protocol is active.
 * Service controls start and stop of protocol listener. Notifies GUI about
 * events happening in the background. Creates Notifications to inform the user
 * what it happening.
 * 
 * @author Mihai Plasoianu
 * @author Lars Pandikow
 * @author Wulf Pfeiffer
 */
public class HoneyService extends Service {

	private static Context context;

	/**
	 * Returns the application context.
	 * 
	 * @return context.
	 */
	public static Context getContext() {
		return HoneyService.context;
	}

	private ArrayList<HoneyListener> listeners = new ArrayList<HoneyListener>();
	private NotificationCompat.Builder builder;
	private SharedPreferences sessionPref;
	private Editor editor;

	public List<HoneyListener> getListeners() {
		return listeners;
	}

	private final IBinder mBinder = new LocalBinder();

	public class LocalBinder extends Binder {
		public HoneyService getService() {
			return HoneyService.this;
		}
	}

	@Override
	public IBinder onBind(Intent intent) {
		return mBinder;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		HoneyService.context = getApplicationContext();
		sessionPref = getSharedPreferences(MainActivity.SESSION_DATA,
				Context.MODE_PRIVATE);
		editor = sessionPref.edit();
		createNotification();
		for (Protocol protocol : getProtocolArray()) {
			listeners.add(new HoneyListener(this, protocol));
		}
		registerNetReceiver();
		getLocationData();
		new QotdTask().execute(new String[] {});
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		// We want this service to continue running until it is explicitly
		// stopped, so return sticky.
		return START_STICKY;
	}

	@Override
	public void onDestroy() {
		cancelNotification();
		super.onDestroy();
		unregisterNetReceiver();
	}

	/**
	 * Starts an Instance of MyLocationManager to set the location within this
	 * class.
	 */
	private void getLocationData() {
		// TODO Put time and attempts in settings
		MyLocationManager locationManager = new MyLocationManager(this);
		locationManager.getUpdates(60 * 1000, 3);
	}

	/**
	 * Deletes all session related data.
	 */
	private void deleteSessionData() {
		editor.clear();
		editor.commit();
	}

	/**
	 * Register broadcast receiver for connectivity changes
	 */
	private void registerNetReceiver() {
		// register BroadcastReceiver on network state changes
		IntentFilter intent = new IntentFilter();
		intent.addAction(ConnectivityManager.CONNECTIVITY_ACTION); // "android.net.conn.CONNECTIVITY_CHANGE"
		registerReceiver(netReceiver, intent);
	}

	/**
	 * Unregister broadcast receiver for connectivity changes
	 */
	private void unregisterNetReceiver() {
		unregisterReceiver(netReceiver);
	}

	/**
	 * Receiver for connectivity change broadcast.
	 * 
	 * @see MainActivity#BROADCAST
	 */
	private BroadcastReceiver netReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			String bssid_old = sessionPref.getString(MainActivity.BSSID, "");
			String bssid_new = HelperUtils.getBSSID(context);
			// TODO INFORM UI
			// TODO CHECK IF OTHER NETWORKS WORK TOO
			if (bssid_new == null || !bssid_new.equals(bssid_old)) {
				getLocationData();
				String[] protocols = getResources().getStringArray(
						R.array.protocols);
				for (String protocol : protocols) {
					editor.remove(protocol + MainActivity.HANDLER_COUNT);
				}
				notifyUI("SERVICE", "CONNECTIVITY_CHANGE");
			}
		}
	};

	/**
	 * Creates a Notification in the notification bar.
	 */
	private void createNotification() {
		UglyDbHelper dbh = new UglyDbHelper(this);
		boolean activeHandlers = false;
		boolean bssidSeen = false;

		for (String protocol : getResources().getStringArray(R.array.protocols)) {
			int handlerCount = sessionPref.getInt(protocol
					+ MainActivity.HANDLER_COUNT, 0);
			if (handlerCount > 0) {
				activeHandlers = true;
			}
			if (dbh.bssidSeen(protocol,
					HelperUtils.getBSSID(getApplicationContext()))) {
				bssidSeen = true;
			}
		}
		builder = new NotificationCompat.Builder(this).setContentTitle(
				getString(R.string.app_name)).setWhen(
				System.currentTimeMillis());
		if (activeHandlers) {
			builder.setSmallIcon(R.drawable.ic_service_red);
			builder.setContentText("Network is infected!");
		} else if (bssidSeen) {
			builder.setSmallIcon(R.drawable.ic_service_yellow);
			builder.setContentText("Network has been infected in previous session!");
		} else {
			builder.setSmallIcon(R.drawable.ic_service_green);
			builder.setContentText("Everything looks fine!");
		}
		TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
		stackBuilder.addParentStack(MainActivity.class);
		stackBuilder.addNextIntent(new Intent(this, MainActivity.class));
		PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
				PendingIntent.FLAG_UPDATE_CURRENT);
		builder.setContentIntent(resultPendingIntent);
		NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
		mNotificationManager.notify(1, builder.build());
	}

	/**
	 * Updates the notification when a attack is registered.
	 */
	private void updateNotification() {
		SharedPreferences defaultPref = PreferenceManager
				.getDefaultSharedPreferences(this);
		String strRingtonePreference = defaultPref.getString(
				"pref_notification_sound",
				"content://settings/system/notification_sound");
		builder = new NotificationCompat.Builder(this)
				.setContentTitle(getString(R.string.app_name))
				.setTicker("Honeypot under attack!")
				.setContentText("Network is infected!")
				.setSmallIcon(R.drawable.ic_service_red).setAutoCancel(true)
				.setWhen(System.currentTimeMillis())
				.setSound(Uri.parse(strRingtonePreference));
		TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
		stackBuilder.addParentStack(MainActivity.class);
		stackBuilder.addNextIntent(new Intent(this, MainActivity.class));
		PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
				PendingIntent.FLAG_UPDATE_CURRENT);
		builder.setContentIntent(resultPendingIntent);
		if (defaultPref.getBoolean("pref_vibration", false)) {
			builder.setVibrate(new long[] { 100, 200, 100, 200 });
		}

		NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
		mNotificationManager.notify(1, builder.build());
	}

	/**
	 * Cancels the Notification
	 */
	private void cancelNotification() {
		NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
		mNotificationManager.cancel(1);
	}

	/**
	 * Creates a instance of each protocol defined in /res/values/protocols.xml
	 * and puts it in a List
	 * 
	 * @return ArrayList of
	 *         {@link de.tudarmstadt.informatik.hostage.protocol.Protocol
	 *         Protocol}
	 */
	private ArrayList<Protocol> getProtocolArray() {
		String[] protocols = getResources().getStringArray(R.array.protocols);
		String packageName = Protocol.class.getPackage().getName();
		ArrayList<Protocol> protocolArray = new ArrayList<Protocol>();

		for (String protocol : protocols) {
			try {
				protocolArray.add((Protocol) Class.forName(
						String.format("%s.%s", packageName, protocol))
						.newInstance());
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return protocolArray;
	}

	/**
	 * Determines if there are running listeners.
	 * 
	 * @return True if there is a running listener, else false.
	 */
	public boolean hasRunningListeners() {
		for (HoneyListener listener : listeners) {
			if (listener.isRunning())
				return true;
		}
		return false;
	}

	/**
	 * Notifies the GUI about a event.
	 * 
	 * @param protocol
	 *            The protocol where the event happened.
	 * @param key
	 *            The key for the event.
	 */
	public void notifyUI(String sender, String key) {
		// Send Notification
		if (key.equals(MainActivity.HANDLER_COUNT)) {
			updateNotification();
		} else if (key.equals("CONNECTIVITY_CHANGE")) {
			createNotification();
		}
		Log.i("HoneyService", key);
		// Inform UI of Preference Change
		Intent intent = new Intent(MainActivity.BROADCAST);
		intent.putExtra("SENDER", sender);
		intent.putExtra("SENDER", key);
		LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
	}

	/**
	 * Starts all listeners which are not already running
	 */
	public void startListeners() {
		for (HoneyListener listener : listeners) {
			if (!listener.isRunning()) {
				listener.start();
			}
		}
		Toast.makeText(getApplicationContext(), "SERVICES STARTED!",
				Toast.LENGTH_SHORT).show();
	}

	/**
	 * Stops all running listeners.
	 */
	public void stopListeners() {
		for (HoneyListener listener : listeners) {
			if (listener.isRunning()) {
				listener.stop();
			}
		}
		Toast.makeText(getApplicationContext(), "SERVICES STOPPED!",
				Toast.LENGTH_SHORT).show();
	}

	/**
	 * Starts the listener for the specified protocol.
	 * 
	 * @param protocolName
	 *            Name of the protocol that should be started.
	 */
	public void startListener(String protocolName) {
		for (HoneyListener listener : listeners) {
			if (listener.getProtocolName().equals(protocolName)) {
				if (!listener.isRunning()) {
					listener.start();
				}
			}
		}
		Toast.makeText(getApplicationContext(),
				protocolName + " SERVICE STARTED!", Toast.LENGTH_SHORT).show();
	}

	/**
	 * Stops the listener for the specified protocol.
	 * 
	 * @param protocolName
	 *            Name of the protocol that should be stopped.
	 */
	public void stopListener(String protocolName) {
		for (HoneyListener listener : listeners) {
			if (listener.getProtocolName().equals(protocolName)) {
				if (listener.isRunning()) {
					listener.stop();
				}
			}
		}
		Toast.makeText(getApplicationContext(),
				protocolName + " SERVICE STOPPED!", Toast.LENGTH_SHORT).show();
	}

	/**
	 * Toggles a listener for specified protocol.
	 * 
	 * @param protocolName
	 *            Name of the protocol that should be toggled.
	 */
	public void toggleListener(String protocolName) {
		for (HoneyListener listener : listeners) {
			if (listener.getProtocolName().equals(protocolName)) {
				if (listener.isRunning()) {
					stopListener(protocolName);
				} else {
					startListener(protocolName);
				}
			}
		}
	}

	/**
	 * Task for accuiring a qotd from one of four possible servers.
	 * 
	 * @author Wulf Pfeiffer
	 */
	private class QotdTask extends AsyncTask<String, Void, String> {
		@Override
		protected String doInBackground(String... unused) {
			String[] sources = new String[] { "djxmmx.net", "ota.iambic.com",
					"alpha.mike-r.com", "electricbiscuit.org" };
			SecureRandom rndm = new SecureRandom();
			StringBuffer sb = new StringBuffer();
			try {
				Socket client = new Socket(sources[rndm.nextInt(4)], 17);
				BufferedReader in = new BufferedReader(new InputStreamReader(
						client.getInputStream()));
				while (!in.ready())
					;
				while (in.ready()) {
					sb.append(in.readLine());
				}
				in.close();
				client.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
			return sb.toString();
		}

		@Override
		protected void onPostExecute(String result) {
			if (result != null)
				ProtocolSettings.setHttpQotd(result);
			else
				ProtocolSettings.setHttpQotd(new String(HelperUtils
						.getRandomString(100, false)));
		}
	};
}