package eu.siacs.conversations.services;

import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.SystemClock;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationCompat.BigPictureStyle;
import android.support.v4.app.NotificationCompat.Builder;
import android.support.v4.app.NotificationManagerCompat;
import android.support.v4.app.RemoteInput;
import android.text.Html;
import android.util.DisplayMetrics;
import android.util.Log;

import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.ui.ConversationActivity;
import eu.siacs.conversations.ui.ManageAccountActivity;
import eu.siacs.conversations.ui.SettingsActivity;
import eu.siacs.conversations.ui.TimePreference;
import eu.siacs.conversations.utils.GeoHelper;
import eu.siacs.conversations.utils.UIHelper;

public class NotificationService {

	private static final String CONVERSATIONS_GROUP = "eu.siacs.conversations";
	private final XmppConnectionService mXmppConnectionService;

	private final LinkedHashMap<String, ArrayList<Message>> notifications = new LinkedHashMap<>();

	public static final int NOTIFICATION_ID = 0x2342;
	public static final int FOREGROUND_NOTIFICATION_ID = 0x8899;
	public static final int ERROR_NOTIFICATION_ID = 0x5678;

	private Conversation mOpenConversation;
	private boolean mIsInForeground;
	private long mLastNotification;

	public NotificationService(final XmppConnectionService service) {
		this.mXmppConnectionService = service;
	}

	public boolean notify(final Message message) {
		return (message.getStatus() == Message.STATUS_RECEIVED)
				&& notificationsEnabled()
				&& !message.getConversation().isMuted()
				&& (message.getConversation().alwaysNotify() || wasHighlightedOrPrivate(message)
		);
	}

	public boolean notificationsEnabled() {
		return mXmppConnectionService.getPreferences().getBoolean("show_notification", true);
	}

	public boolean isQuietHours() {
		if (!mXmppConnectionService.getPreferences().getBoolean("enable_quiet_hours", false)) {
			return false;
		}
		final long startTime = mXmppConnectionService.getPreferences().getLong("quiet_hours_start", TimePreference.DEFAULT_VALUE) % Config.MILLISECONDS_IN_DAY;
		final long endTime = mXmppConnectionService.getPreferences().getLong("quiet_hours_end", TimePreference.DEFAULT_VALUE) % Config.MILLISECONDS_IN_DAY;
		final long nowTime = Calendar.getInstance().getTimeInMillis() % Config.MILLISECONDS_IN_DAY;

		if (endTime < startTime) {
			return nowTime > startTime || nowTime < endTime;
		} else {
			return nowTime > startTime && nowTime < endTime;
		}
	}

	public void pushFromBacklog(final Message message) {
		if (notify(message)) {
			synchronized (notifications) {
				pushToStack(message);
			}
		}
	}

	public void pushFromDirectReply(final Message message) {
		synchronized (notifications) {
			pushToStack(message);
			updateNotification(false);
		}
	}

	public void finishBacklog(boolean notify, Account account) {
		synchronized (notifications) {
			mXmppConnectionService.updateUnreadCountBadge();
			if (account == null || !notify) {
				updateNotification(notify);
			} else {
				boolean hasPendingMessages = false;
				for(ArrayList<Message> messages : notifications.values()) {
					if (messages.size() > 0 && messages.get(0).getConversation().getAccount() == account) {
						hasPendingMessages = true;
						break;
					}
				}
				updateNotification(hasPendingMessages);
			}
		}
	}

	public void finishBacklog(boolean notify) {
		finishBacklog(notify,null);
	}

	private void pushToStack(final Message message) {
		final String conversationUuid = message.getConversationUuid();
		if (notifications.containsKey(conversationUuid)) {
			notifications.get(conversationUuid).add(message);
		} else {
			final ArrayList<Message> mList = new ArrayList<>();
			mList.add(message);
			notifications.put(conversationUuid, mList);
		}
	}

	public void push(final Message message) {
		mXmppConnectionService.updateUnreadCountBadge();
		if (!notify(message)) {
			Log.d(Config.LOGTAG,message.getConversation().getAccount().getJid().toBareJid()+": suppressing notification because turned off");
			return;
		}
		final boolean isScreenOn = mXmppConnectionService.isInteractive();
		if (this.mIsInForeground && isScreenOn && this.mOpenConversation == message.getConversation()) {
			Log.d(Config.LOGTAG,message.getConversation().getAccount().getJid().toBareJid()+": suppressing notification because conversation is open");
			return;
		}
		synchronized (notifications) {
			pushToStack(message);
			final Account account = message.getConversation().getAccount();
			final boolean doNotify = (!(this.mIsInForeground && this.mOpenConversation == null) || !isScreenOn)
					&& !account.inGracePeriod()
					&& !this.inMiniGracePeriod(account);
			updateNotification(doNotify);
		}
	}

	public void clear() {
		synchronized (notifications) {
			for(ArrayList<Message> messages : notifications.values()) {
				markAsReadIfHasDirectReply(messages);
			}
			notifications.clear();
			updateNotification(false);
		}
	}

	public void clear(final Conversation conversation) {
		synchronized (notifications) {
			markAsReadIfHasDirectReply(conversation);
			notifications.remove(conversation.getUuid());
			final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
			notificationManager.cancel(conversation.getUuid(), NOTIFICATION_ID);
			updateNotification(false);
		}
	}

	private void markAsReadIfHasDirectReply(final Conversation conversation) {
		markAsReadIfHasDirectReply(notifications.get(conversation.getUuid()));
	}

	private void markAsReadIfHasDirectReply(final ArrayList<Message> messages) {
		if (messages != null && messages.size() > 0) {
			Message last = messages.get(messages.size() - 1);
			if (last.getStatus() != Message.STATUS_RECEIVED) {
				mXmppConnectionService.markRead(last.getConversation(), false);
			}
		}
	}

	private void setNotificationColor(final Builder mBuilder) {
		mBuilder.setColor(mXmppConnectionService.getResources().getColor(R.color.primary500));
	}

	public void updateNotification(final boolean notify) {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		final SharedPreferences preferences = mXmppConnectionService.getPreferences();

		if (notifications.size() == 0) {
			notificationManager.cancel(NOTIFICATION_ID);
		} else {
			if (notify) {
				this.markLastNotification();
			}
			final Builder mBuilder;
			if (notifications.size() == 1 && Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
				mBuilder = buildSingleConversations(notifications.values().iterator().next());
				modifyForSoundVibrationAndLight(mBuilder, notify, preferences);
				notificationManager.notify(NOTIFICATION_ID, mBuilder.build());
			} else {
				mBuilder = buildMultipleConversation();
				modifyForSoundVibrationAndLight(mBuilder, notify, preferences);
				notificationManager.notify(NOTIFICATION_ID, mBuilder.build());
				for(Map.Entry<String,ArrayList<Message>> entry : notifications.entrySet()) {
					Builder singleBuilder = buildSingleConversations(entry.getValue());
					singleBuilder.setGroup(CONVERSATIONS_GROUP);
					modifyForSoundVibrationAndLight(singleBuilder,notify,preferences);
					notificationManager.notify(entry.getKey(), NOTIFICATION_ID ,singleBuilder.build());
				}
			}
		}
	}


	private void modifyForSoundVibrationAndLight(Builder mBuilder, boolean notify, SharedPreferences preferences) {
		final String ringtone = preferences.getString("notification_ringtone", null);
		final boolean vibrate = preferences.getBoolean("vibrate_on_notification", true);
		final boolean led = preferences.getBoolean("led", true);
		if (notify && !isQuietHours()) {
			if (vibrate) {
				final int dat = 70;
				final long[] pattern = {0, 3 * dat, dat, dat};
				mBuilder.setVibrate(pattern);
			}
			if (ringtone != null) {
				mBuilder.setSound(Uri.parse(ringtone));
			}
		}
		if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			mBuilder.setCategory(Notification.CATEGORY_MESSAGE);
		}
		setNotificationColor(mBuilder);
		mBuilder.setDefaults(0);
		if (led) {
			mBuilder.setLights(0xff00FF00, 2000, 3000);
		}
	}

	private Builder buildMultipleConversation() {
		final Builder mBuilder = new NotificationCompat.Builder(
				mXmppConnectionService);
		final NotificationCompat.InboxStyle style = new NotificationCompat.InboxStyle();
		style.setBigContentTitle(notifications.size()
				+ " "
				+ mXmppConnectionService
				.getString(R.string.unread_conversations));
		final StringBuilder names = new StringBuilder();
		Conversation conversation = null;
		for (final ArrayList<Message> messages : notifications.values()) {
			if (messages.size() > 0) {
				conversation = messages.get(0).getConversation();
				final String name = conversation.getName();
				if (Config.HIDE_MESSAGE_TEXT_IN_NOTIFICATION) {
					int count = messages.size();
					style.addLine(Html.fromHtml("<b>"+name+"</b>: "+mXmppConnectionService.getResources().getQuantityString(R.plurals.x_messages,count,count)));
				} else {
					style.addLine(Html.fromHtml("<b>" + name + "</b>: "
							+ UIHelper.getMessagePreview(mXmppConnectionService, messages.get(0)).first));
				}
				names.append(name);
				names.append(", ");
			}
		}
		if (names.length() >= 2) {
			names.delete(names.length() - 2, names.length());
		}
		mBuilder.setContentTitle(notifications.size()
				+ " "
				+ mXmppConnectionService
				.getString(R.string.unread_conversations));
		mBuilder.setContentText(names.toString());
		mBuilder.setStyle(style);
		if (conversation != null) {
			mBuilder.setContentIntent(createContentIntent(conversation));
		}
		mBuilder.setGroupSummary(true);
		mBuilder.setGroup(CONVERSATIONS_GROUP);
		mBuilder.setDeleteIntent(createDeleteIntent(null));
		mBuilder.setSmallIcon(R.drawable.ic_notification);
		return mBuilder;
	}

	private Builder buildSingleConversations(final ArrayList<Message> messages) {
		final Builder mBuilder = new NotificationCompat.Builder(mXmppConnectionService);
		if (messages.size() >= 1) {
			final Conversation conversation = messages.get(0).getConversation();
			mBuilder.setLargeIcon(mXmppConnectionService.getAvatarService()
					.get(conversation, getPixel(64)));
			mBuilder.setContentTitle(conversation.getName());
			if (Config.HIDE_MESSAGE_TEXT_IN_NOTIFICATION) {
				int count = messages.size();
				mBuilder.setContentText(mXmppConnectionService.getResources().getQuantityString(R.plurals.x_messages,count,count));
			} else {
				Message message;
				if ((message = getImage(messages)) != null) {
					modifyForImage(mBuilder, message, messages);
				} else {
					modifyForTextOnly(mBuilder, messages);
				}
				RemoteInput remoteInput = new RemoteInput.Builder("text_reply").setLabel(UIHelper.getMessageHint(mXmppConnectionService, conversation)).build();
				NotificationCompat.Action replyAction = new NotificationCompat.Action.Builder(R.drawable.ic_send_text_offline, "Reply", createReplyIntent(conversation, false)).addRemoteInput(remoteInput).build();
				NotificationCompat.Action wearReplyAction = new NotificationCompat.Action.Builder(R.drawable.ic_send_text_offline, "Reply", createReplyIntent(conversation, true)).addRemoteInput(remoteInput).build();
				mBuilder.extend(new NotificationCompat.WearableExtender().addAction(wearReplyAction));
				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
					mBuilder.addAction(replyAction);
				}
				if ((message = getFirstDownloadableMessage(messages)) != null) {
					mBuilder.addAction(
							Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ?
									R.drawable.ic_file_download_white_24dp : R.drawable.ic_action_download,
							mXmppConnectionService.getResources().getString(R.string.download_x_file,
									UIHelper.getFileDescriptionString(mXmppConnectionService, message)),
							createDownloadIntent(message)
					);
				}
				if ((message = getFirstLocationMessage(messages)) != null) {
					mBuilder.addAction(R.drawable.ic_room_white_24dp,
							mXmppConnectionService.getString(R.string.show_location),
							createShowLocationIntent(message));
				}
			}
			if (conversation.getMode() == Conversation.MODE_SINGLE) {
				Contact contact = conversation.getContact();
				Uri systemAccount = contact.getSystemAccount();
				if (systemAccount != null) {
					mBuilder.addPerson(systemAccount.toString());
				}
			}
			mBuilder.setWhen(conversation.getLatestMessage().getTimeSent());
			mBuilder.setSmallIcon(R.drawable.ic_notification);
			mBuilder.setDeleteIntent(createDeleteIntent(conversation));
			mBuilder.setContentIntent(createContentIntent(conversation));
		}
		return mBuilder;
	}

	private void modifyForImage(final Builder builder, final Message message,
								final ArrayList<Message> messages) {
		try {
			final Bitmap bitmap = mXmppConnectionService.getFileBackend()
					.getThumbnail(message, getPixel(288), false);
			final ArrayList<Message> tmp = new ArrayList<>();
			for (final Message msg : messages) {
				if (msg.getType() == Message.TYPE_TEXT
						&& msg.getTransferable() == null) {
					tmp.add(msg);
				}
			}
			final BigPictureStyle bigPictureStyle = new NotificationCompat.BigPictureStyle();
			bigPictureStyle.bigPicture(bitmap);
			if (tmp.size() > 0) {
				CharSequence text = getMergedBodies(tmp);
				bigPictureStyle.setSummaryText(text);
				builder.setContentText(text);
			} else {
				builder.setContentText(mXmppConnectionService.getString(
						R.string.received_x_file,
						UIHelper.getFileDescriptionString(mXmppConnectionService, message)));
			}
			builder.setStyle(bigPictureStyle);
		} catch (final FileNotFoundException e) {
			modifyForTextOnly(builder, messages);
		}
	}

	private void modifyForTextOnly(final Builder builder, final ArrayList<Message> messages) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
			NotificationCompat.MessagingStyle messagingStyle = new NotificationCompat.MessagingStyle(mXmppConnectionService.getString(R.string.me));
			Conversation conversation = messages.get(0).getConversation();
			if (conversation.getMode() == Conversation.MODE_MULTI) {
				messagingStyle.setConversationTitle(conversation.getName());
			}
			for (Message message : messages) {
				String sender = message.getStatus() == Message.STATUS_RECEIVED ? UIHelper.getMessageDisplayName(message) : null;
				messagingStyle.addMessage(UIHelper.getMessagePreview(mXmppConnectionService,message).first, message.getTimeSent(), sender);
			}
			builder.setStyle(messagingStyle);
		} else {
			builder.setStyle(new NotificationCompat.BigTextStyle().bigText(getMergedBodies(messages)));
			builder.setContentText(UIHelper.getMessagePreview(mXmppConnectionService, messages.get((messages.size()-1))).first);
		}
	}

	private Message getImage(final Iterable<Message> messages) {
		Message image = null;
		for (final Message message : messages) {
			if (message.getStatus() != Message.STATUS_RECEIVED) {
				return null;
			}
			if (message.getType() != Message.TYPE_TEXT
					&& message.getTransferable() == null
					&& message.getEncryption() != Message.ENCRYPTION_PGP
					&& message.getFileParams().height > 0) {
				image = message;
			}
		}
		return image;
	}

	private Message getFirstDownloadableMessage(final Iterable<Message> messages) {
		for (final Message message : messages) {
			if (message.getTransferable() != null
					&& (message.getType() == Message.TYPE_FILE
							|| message.getType() == Message.TYPE_IMAGE
							|| message.treatAsDownloadable() != Message.Decision.NEVER)) {
				return message;
			}
		}
		return null;
	}

	private Message getFirstLocationMessage(final Iterable<Message> messages) {
		for (final Message message : messages) {
			if (GeoHelper.isGeoUri(message.getBody())) {
				return message;
			}
		}
		return null;
	}

	private CharSequence getMergedBodies(final ArrayList<Message> messages) {
		final StringBuilder text = new StringBuilder();
		for (int i = 0; i < messages.size(); ++i) {
			text.append(UIHelper.getMessagePreview(mXmppConnectionService, messages.get(i)).first);
			if (i != messages.size() - 1) {
				text.append("\n");
			}
		}
		return text.toString();
	}

	private PendingIntent createShowLocationIntent(final Message message) {
		Iterable<Intent> intents = GeoHelper.createGeoIntentsFromMessage(message);
		for (Intent intent : intents) {
			if (intent.resolveActivity(mXmppConnectionService.getPackageManager()) != null) {
				return PendingIntent.getActivity(mXmppConnectionService, 18, intent, PendingIntent.FLAG_UPDATE_CURRENT);
			}
		}
		return createOpenConversationsIntent();
	}

	private PendingIntent createContentIntent(final String conversationUuid, final String downloadMessageUuid) {
		final Intent viewConversationIntent = new Intent(mXmppConnectionService,ConversationActivity.class);
		viewConversationIntent.setAction(ConversationActivity.ACTION_VIEW_CONVERSATION);
		viewConversationIntent.putExtra(ConversationActivity.CONVERSATION, conversationUuid);
		if (downloadMessageUuid != null) {
			viewConversationIntent.putExtra(ConversationActivity.EXTRA_DOWNLOAD_UUID, downloadMessageUuid);
			return PendingIntent.getActivity(mXmppConnectionService,
					conversationUuid.hashCode() % 389782,
					viewConversationIntent,
					PendingIntent.FLAG_UPDATE_CURRENT);
		} else {
			return PendingIntent.getActivity(mXmppConnectionService,
					conversationUuid.hashCode() % 936236,
					viewConversationIntent,
					PendingIntent.FLAG_UPDATE_CURRENT);
		}
	}

	private PendingIntent createDownloadIntent(final Message message) {
		return createContentIntent(message.getConversationUuid(), message.getUuid());
	}

	private PendingIntent createContentIntent(final Conversation conversation) {
		return createContentIntent(conversation.getUuid(), null);
	}

	private PendingIntent createDeleteIntent(Conversation conversation) {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_CLEAR_NOTIFICATION);
		if (conversation != null) {
			intent.putExtra("uuid", conversation.getUuid());
			return PendingIntent.getService(mXmppConnectionService, conversation.getUuid().hashCode() % 247527, intent, 0);
		}
		return PendingIntent.getService(mXmppConnectionService, 0, intent, 0);
	}

	private PendingIntent createReplyIntent(Conversation conversation, boolean dismissAfterReply) {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_REPLY_TO_CONVERSATION);
		intent.putExtra("uuid",conversation.getUuid());
		intent.putExtra("dismiss_notification",dismissAfterReply);
		int id =  conversation.getUuid().hashCode() % (dismissAfterReply ? 402359 : 426583);
		return PendingIntent.getService(mXmppConnectionService, id, intent, 0);
	}

	private PendingIntent createDisableForeground() {
		final Intent intent = new Intent(mXmppConnectionService,
				XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_DISABLE_FOREGROUND);
		return PendingIntent.getService(mXmppConnectionService, 34, intent, 0);
	}

	private PendingIntent createTryAgainIntent() {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_TRY_AGAIN);
		return PendingIntent.getService(mXmppConnectionService, 45, intent, 0);
	}

	private PendingIntent createDismissErrorIntent() {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_DISMISS_ERROR_NOTIFICATIONS);
		return PendingIntent.getService(mXmppConnectionService, 69, intent, 0);
	}

	private boolean wasHighlightedOrPrivate(final Message message) {
		final String nick = message.getConversation().getMucOptions().getActualNick();
		final Pattern highlight = generateNickHighlightPattern(nick);
		if (message.getBody() == null || nick == null) {
			return false;
		}
		final Matcher m = highlight.matcher(message.getBody());
		return (m.find() || message.getType() == Message.TYPE_PRIVATE);
	}

	private static Pattern generateNickHighlightPattern(final String nick) {
		// We expect a word boundary, i.e. space or start of string, followed by
		// the
		// nick (matched in case-insensitive manner), followed by optional
		// punctuation (for example "bob: i disagree" or "how are you alice?"),
		// followed by another word boundary.
		return Pattern.compile("\\b" + Pattern.quote(nick) + "\\p{Punct}?\\b",
				Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
	}

	public void setOpenConversation(final Conversation conversation) {
		this.mOpenConversation = conversation;
	}

	public void setIsInForeground(final boolean foreground) {
		this.mIsInForeground = foreground;
	}

	private int getPixel(final int dp) {
		final DisplayMetrics metrics = mXmppConnectionService.getResources()
				.getDisplayMetrics();
		return ((int) (dp * metrics.density));
	}

	private void markLastNotification() {
		this.mLastNotification = SystemClock.elapsedRealtime();
	}

	private boolean inMiniGracePeriod(final Account account) {
		final int miniGrace = account.getStatus() == Account.State.ONLINE ? Config.MINI_GRACE_PERIOD
				: Config.MINI_GRACE_PERIOD * 2;
		return SystemClock.elapsedRealtime() < (this.mLastNotification + miniGrace);
	}

	public Notification createForegroundNotification() {
		final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mXmppConnectionService);

		mBuilder.setContentTitle(mXmppConnectionService.getString(R.string.conversations_foreground_service));
		if (Config.SHOW_CONNECTED_ACCOUNTS) {
			List<Account> accounts = mXmppConnectionService.getAccounts();
			int enabled = 0;
			int connected = 0;
			for (Account account : accounts) {
				if (account.isOnlineAndConnected()) {
					connected++;
					enabled++;
				} else if (!account.isOptionSet(Account.OPTION_DISABLED)) {
					enabled++;
				}
			}
			mBuilder.setContentText(mXmppConnectionService.getString(R.string.connected_accounts, connected, enabled));
		} else {
			mBuilder.setContentText(mXmppConnectionService.getString(R.string.touch_to_open_conversations));
		}
		mBuilder.setContentIntent(createOpenConversationsIntent());
		mBuilder.setWhen(0);
		mBuilder.setPriority(Config.SHOW_CONNECTED_ACCOUNTS ? NotificationCompat.PRIORITY_DEFAULT : NotificationCompat.PRIORITY_MIN);
		mBuilder.setSmallIcon(R.drawable.ic_link_white_24dp);
		if (Config.SHOW_DISABLE_FOREGROUND) {
			final int cancelIcon;
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
				mBuilder.setCategory(Notification.CATEGORY_SERVICE);
				cancelIcon = R.drawable.ic_cancel_white_24dp;
			} else {
				cancelIcon = R.drawable.ic_action_cancel;
			}
			mBuilder.addAction(cancelIcon,
					mXmppConnectionService.getString(R.string.disable_foreground_service),
					createDisableForeground());
		}
		return mBuilder.build();
	}

	private PendingIntent createOpenConversationsIntent() {
		return PendingIntent.getActivity(mXmppConnectionService, 0, new Intent(mXmppConnectionService, ConversationActivity.class), 0);
	}

	public void updateErrorNotification() {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		final List<Account> errors = new ArrayList<>();
		for (final Account account : mXmppConnectionService.getAccounts()) {
			if (account.hasErrorStatus() && account.showErrorNotification()) {
				errors.add(account);
			}
		}
		if (mXmppConnectionService.getPreferences().getBoolean(SettingsActivity.KEEP_FOREGROUND_SERVICE, false)) {
			notificationManager.notify(FOREGROUND_NOTIFICATION_ID, createForegroundNotification());
		}
		final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mXmppConnectionService);
		if (errors.size() == 0) {
			notificationManager.cancel(ERROR_NOTIFICATION_ID);
			return;
		} else if (errors.size() == 1) {
			mBuilder.setContentTitle(mXmppConnectionService.getString(R.string.problem_connecting_to_account));
			mBuilder.setContentText(errors.get(0).getJid().toBareJid().toString());
		} else {
			mBuilder.setContentTitle(mXmppConnectionService.getString(R.string.problem_connecting_to_accounts));
			mBuilder.setContentText(mXmppConnectionService.getString(R.string.touch_to_fix));
		}
		mBuilder.addAction(R.drawable.ic_autorenew_white_24dp,
				mXmppConnectionService.getString(R.string.try_again),
				createTryAgainIntent());
		mBuilder.setDeleteIntent(createDismissErrorIntent());
		mBuilder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			mBuilder.setSmallIcon(R.drawable.ic_warning_white_24dp);
		} else {
			mBuilder.setSmallIcon(R.drawable.ic_stat_alert_warning);
		}
		mBuilder.setContentIntent(PendingIntent.getActivity(mXmppConnectionService,
				145,
				new Intent(mXmppConnectionService,ManageAccountActivity.class),
				PendingIntent.FLAG_UPDATE_CURRENT));
		notificationManager.notify(ERROR_NOTIFICATION_ID, mBuilder.build());
	}
}