package eu.siacs.conversations.services;

import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Build;
import android.os.SystemClock;
import android.preference.PreferenceManager;
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.NotificationCompat.CarExtender.UnreadConversation;
import android.support.v4.app.RemoteInput;
import android.support.v4.content.ContextCompat;
import android.text.SpannableString;
import android.text.style.StyleSpan;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.Pair;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
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.Conversational;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.persistance.FileBackend;
import eu.siacs.conversations.ui.ConversationsActivity;
import eu.siacs.conversations.ui.ManageAccountActivity;
import eu.siacs.conversations.ui.TimePreference;
import eu.siacs.conversations.utils.GeoHelper;
import eu.siacs.conversations.utils.UIHelper;
import eu.siacs.conversations.xmpp.XmppConnection;

public class NotificationService {

	public static final Object CATCHUP_LOCK = new Object();

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

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

	private static final int NOTIFICATION_ID_MULTIPLIER = 1024 * 1024;

	public static final int NOTIFICATION_ID = 2 * NOTIFICATION_ID_MULTIPLIER;
	public static final int FOREGROUND_NOTIFICATION_ID = NOTIFICATION_ID_MULTIPLIER * 4;
	public static final int ERROR_NOTIFICATION_ID = NOTIFICATION_ID_MULTIPLIER * 6;

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

	private final HashMap<Conversation, AtomicInteger> mBacklogMessageCounter = new HashMap<>();

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

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

	public boolean notificationsEnabled() {
		return mXmppConnectionService.getBooleanPreference("show_notification", R.bool.show_notification);
	}

	private boolean notificationsFromStrangers() {
		return mXmppConnectionService.getBooleanPreference("notifications_from_strangers", R.bool.notifications_from_strangers);
	}

	public boolean isQuietHours() {
		if (!mXmppConnectionService.getBooleanPreference("enable_quiet_hours", R.bool.enable_quiet_hours)) {
			return false;
		}
		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(mXmppConnectionService);
		final long startTime = preferences.getLong("quiet_hours_start", TimePreference.DEFAULT_VALUE) % Config.MILLISECONDS_IN_DAY;
		final long endTime = preferences.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) {
				getBacklogMessageCounter((Conversation) message.getConversation()).incrementAndGet();
				pushToStack(message);
			}
		}
	}

	private AtomicInteger getBacklogMessageCounter(Conversation conversation) {
		synchronized (mBacklogMessageCounter) {
			if (!mBacklogMessageCounter.containsKey(conversation)) {
				mBacklogMessageCounter.put(conversation, new AtomicInteger(0));
			}
			return mBacklogMessageCounter.get(conversation);
		}
	}

	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 {
				updateNotification(getBacklogMessageCount(account) > 0);
			}
		}
	}

	private int getBacklogMessageCount(Account account) {
		int count = 0;
		synchronized (this.mBacklogMessageCounter) {
			for (Iterator<Map.Entry<Conversation, AtomicInteger>> it = mBacklogMessageCounter.entrySet().iterator(); it.hasNext(); ) {
				Map.Entry<Conversation, AtomicInteger> entry = it.next();
				if (entry.getKey().getAccount() == account) {
					count += entry.getValue().get();
					it.remove();
				}
			}
		}
		Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": backlog message count=" + count);
		return count;
	}

	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) {
		synchronized (CATCHUP_LOCK) {
			final XmppConnection connection = message.getConversation().getAccount().getXmppConnection();
			if (connection.isWaitingForSmCatchup()) {
				connection.incrementSmCatchupMessageCounter();
				pushFromBacklog(message);
			} else {
				pushNow(message);
			}
		}
	}

	private void pushNow(final Message message) {
		mXmppConnectionService.updateUnreadCountBadge();
		if (!notify(message)) {
			Log.d(Config.LOGTAG, message.getConversation().getAccount().getJid().asBareJid() + ": 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().asBareJid() + ": 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 (this.mBacklogMessageCounter) {
			this.mBacklogMessageCounter.remove(conversation);
		}
		synchronized (notifications) {
			markAsReadIfHasDirectReply(conversation);
			if (notifications.remove(conversation.getUuid()) != null) {
				cancel(conversation.getUuid(), NOTIFICATION_ID);
				updateNotification(false, true);
			}
		}
	}

	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) {
				if (mXmppConnectionService.markRead((Conversation) last.getConversation(), false)) {
					mXmppConnectionService.updateConversationUi();
				}
			}
		}
	}

	private void setNotificationColor(final Builder mBuilder) {
		mBuilder.setColor(ContextCompat.getColor(mXmppConnectionService, R.color.green600));
	}

	public void updateNotification(final boolean notify) {
		updateNotification(notify, false);
	}

	public void updateNotification(final boolean notify, boolean summaryOnly) {
		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(mXmppConnectionService);

		if (notifications.size() == 0) {
			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);
				notify(NOTIFICATION_ID, mBuilder.build());
			} else {
				mBuilder = buildMultipleConversation();
				modifyForSoundVibrationAndLight(mBuilder, notify, preferences);
				if (!summaryOnly) {
					for (Map.Entry<String, ArrayList<Message>> entry : notifications.entrySet()) {
						Builder singleBuilder = buildSingleConversations(entry.getValue());
						singleBuilder.setGroup(CONVERSATIONS_GROUP);
						setNotificationColor(singleBuilder);
						notify(entry.getKey(), NOTIFICATION_ID, singleBuilder.build());
					}
				}
				notify(NOTIFICATION_ID, mBuilder.build());
			}
		}
	}


	private void modifyForSoundVibrationAndLight(Builder mBuilder, boolean notify, SharedPreferences preferences) {
		final Resources resources = mXmppConnectionService.getResources();
		final String ringtone = preferences.getString("notification_ringtone", resources.getString(R.string.notification_ringtone));
		final boolean vibrate = preferences.getBoolean("vibrate_on_notification", resources.getBoolean(R.bool.vibrate_on_notification));
		final boolean led = preferences.getBoolean("led", resources.getBoolean(R.bool.led));
		final boolean headsup = preferences.getBoolean("notification_headsup", resources.getBoolean(R.bool.headsup_notifications));
		if (notify && !isQuietHours()) {
			if (vibrate) {
				final int dat = 70;
				final long[] pattern = {0, 3 * dat, dat, dat};
				mBuilder.setVibrate(pattern);
			} else {
				mBuilder.setVibrate(new long[]{0});
			}
			Uri uri = Uri.parse(ringtone);
			try {
				mBuilder.setSound(fixRingtoneUri(uri));
			} catch (SecurityException e) {
				Log.d(Config.LOGTAG, "unable to use custom notification sound " + uri.toString());
			}
		}
		if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
			mBuilder.setCategory(Notification.CATEGORY_MESSAGE);
		}
		mBuilder.setPriority(notify ? (headsup ? NotificationCompat.PRIORITY_HIGH : NotificationCompat.PRIORITY_DEFAULT) : NotificationCompat.PRIORITY_LOW);
		setNotificationColor(mBuilder);
		mBuilder.setDefaults(0);
		if (led) {
			mBuilder.setLights(0xff00FF00, 2000, 3000);
		}
	}

	private Uri fixRingtoneUri(Uri uri) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && "file".equals(uri.getScheme())) {
			return FileBackend.getUriForFile(mXmppConnectionService, new File(uri.getPath()));
		} else {
			return uri;
		}
	}

	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 = (Conversation) messages.get(0).getConversation();
				final String name = conversation.getName().toString();
				SpannableString styledString;
				if (Config.HIDE_MESSAGE_TEXT_IN_NOTIFICATION) {
					int count = messages.size();
					styledString = new SpannableString(name + ": " + mXmppConnectionService.getResources().getQuantityString(R.plurals.x_messages, count, count));
					styledString.setSpan(new StyleSpan(Typeface.BOLD), 0, name.length(), 0);
					style.addLine(styledString);
				} else {
					styledString = new SpannableString(name + ": " + UIHelper.getMessagePreview(mXmppConnectionService, messages.get(0)).first);
					styledString.setSpan(new StyleSpan(Typeface.BOLD), 0, name.length(), 0);
					style.addLine(styledString);
				}
				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 = (Conversation) messages.get(0).getConversation();
			final UnreadConversation.Builder mUnreadBuilder = new UnreadConversation.Builder(conversation.getName().toString());
			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, mUnreadBuilder, message, messages);
				} else {
					modifyForTextOnly(mBuilder, mUnreadBuilder, messages);
				}
				RemoteInput remoteInput = new RemoteInput.Builder("text_reply").setLabel(UIHelper.getMessageHint(mXmppConnectionService, conversation)).build();
				PendingIntent markAsReadPendingIntent = createReadPendingIntent(conversation);
				NotificationCompat.Action markReadAction = new NotificationCompat.Action.Builder(
						R.drawable.ic_drafts_white_24dp,
						mXmppConnectionService.getString(R.string.mark_as_read),
						markAsReadPendingIntent).build();
				String replyLabel = mXmppConnectionService.getString(R.string.reply);
				NotificationCompat.Action replyAction = new NotificationCompat.Action.Builder(
						R.drawable.ic_send_text_offline,
						replyLabel,
						createReplyIntent(conversation, false)).addRemoteInput(remoteInput).build();
				NotificationCompat.Action wearReplyAction = new NotificationCompat.Action.Builder(R.drawable.ic_wear_reply,
						replyLabel,
						createReplyIntent(conversation, true)).addRemoteInput(remoteInput).build();
				mBuilder.extend(new NotificationCompat.WearableExtender().addAction(wearReplyAction));
				mUnreadBuilder.setReplyAction(createReplyIntent(conversation, true), remoteInput);
				mUnreadBuilder.setReadPendingIntent(markAsReadPendingIntent);
				mBuilder.extend(new NotificationCompat.CarExtender().setUnreadConversation(mUnreadBuilder.build()));
				int addedActionsCount = 1;
				mBuilder.addAction(markReadAction);
				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
					mBuilder.addAction(replyAction);
					++addedActionsCount;
				}

				if (displaySnoozeAction(messages)) {
					String label = mXmppConnectionService.getString(R.string.snooze);
					PendingIntent pendingSnoozeIntent = createSnoozeIntent(conversation);
					NotificationCompat.Action snoozeAction = new NotificationCompat.Action.Builder(
							R.drawable.ic_notifications_paused_white_24dp,
							label,
							pendingSnoozeIntent).build();
					mBuilder.addAction(snoozeAction);
					++addedActionsCount;
				}
				if (addedActionsCount < 3) {
					final Message firstLocationMessage = getFirstLocationMessage(messages);
					if (firstLocationMessage != null) {
						String label = mXmppConnectionService.getResources().getString(R.string.show_location);
						PendingIntent pendingShowLocationIntent = createShowLocationIntent(firstLocationMessage);
						NotificationCompat.Action locationAction = new NotificationCompat.Action.Builder(
								R.drawable.ic_room_white_24dp,
								label,
								pendingShowLocationIntent).build();
						mBuilder.addAction(locationAction);
						++addedActionsCount;
					}
				}
				if (addedActionsCount < 3) {
					Message firstDownloadableMessage = getFirstDownloadableMessage(messages);
					if (firstDownloadableMessage != null) {
						String label = mXmppConnectionService.getResources().getString(R.string.download_x_file, UIHelper.getFileDescriptionString(mXmppConnectionService, firstDownloadableMessage));
						PendingIntent pendingDownloadIntent = createDownloadIntent(firstDownloadableMessage);
						NotificationCompat.Action downloadAction = new NotificationCompat.Action.Builder(
								R.drawable.ic_file_download_white_24dp,
								label,
								pendingDownloadIntent).build();
						mBuilder.addAction(downloadAction);
						++addedActionsCount;
					}
				}
			}
			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 static boolean displaySnoozeAction(List<Message> messages) {
		int numberOfMessagesWithoutReply = 0;
		for (Message message : messages) {
			if (message.getStatus() == Message.STATUS_RECEIVED) {
				++numberOfMessagesWithoutReply;
			} else {
				return false;
			}
		}
		return numberOfMessagesWithoutReply >= 3;
	}

	private void modifyForImage(final Builder builder, final UnreadConversation.Builder uBuilder,
	                            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(UIHelper.getFileDescriptionString(mXmppConnectionService, message));
			}
			builder.setStyle(bigPictureStyle);
		} catch (final IOException e) {
			modifyForTextOnly(builder, uBuilder, messages);
		}
	}

	private void modifyForTextOnly(final Builder builder, final UnreadConversation.Builder uBuilder, final ArrayList<Message> messages) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
			NotificationCompat.MessagingStyle messagingStyle = new NotificationCompat.MessagingStyle(mXmppConnectionService.getString(R.string.me));
			final Conversation 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 {
			if (messages.get(0).getConversation().getMode() == Conversation.MODE_SINGLE) {
				builder.setStyle(new NotificationCompat.BigTextStyle().bigText(getMergedBodies(messages)));
				builder.setContentText(UIHelper.getMessagePreview(mXmppConnectionService, messages.get(0)).first);
			} else {
				final NotificationCompat.InboxStyle style = new NotificationCompat.InboxStyle();
				SpannableString styledString;
				for (Message message : messages) {
					final String name = UIHelper.getMessageDisplayName(message);
					styledString = new SpannableString(name + ": " + message.getBody());
					styledString.setSpan(new StyleSpan(Typeface.BOLD), 0, name.length(), 0);
					style.addLine(styledString);
				}
				builder.setStyle(style);
				int count = messages.size();
				if (count == 1) {
					final String name = UIHelper.getMessageDisplayName(messages.get(0));
					styledString = new SpannableString(name + ": " + messages.get(0).getBody());
					styledString.setSpan(new StyleSpan(Typeface.BOLD), 0, name.length(), 0);
					builder.setContentText(styledString);
				} else {
					builder.setContentText(mXmppConnectionService.getResources().getQuantityString(R.plurals.x_messages, count, count));
				}
			}
		}
		/** message preview for Android Auto **/
		for (Message message : messages) {
			Pair<CharSequence, Boolean> preview = UIHelper.getMessagePreview(mXmppConnectionService, message);
			// only show user written text
			if (!preview.second) {
				uBuilder.addMessage(preview.first.toString());
				uBuilder.setLatestTimestamp(message.getTimeSent());
			}
		}
	}

	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_TEXT && message.treatAsDownloadable())) {
				return message;
			}
		}
		return null;
	}

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

	private CharSequence getMergedBodies(final ArrayList<Message> messages) {
		final StringBuilder text = new StringBuilder();
		for (Message message : messages) {
			if (text.length() != 0) {
				text.append("\n");
			}
			text.append(UIHelper.getMessagePreview(mXmppConnectionService, message).first);
		}
		return text.toString();
	}

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

	private PendingIntent createContentIntent(final String conversationUuid, final String downloadMessageUuid) {
		final Intent viewConversationIntent = new Intent(mXmppConnectionService, ConversationsActivity.class);
		viewConversationIntent.setAction(ConversationsActivity.ACTION_VIEW_CONVERSATION);
		viewConversationIntent.putExtra(ConversationsActivity.EXTRA_CONVERSATION, conversationUuid);
		if (downloadMessageUuid != null) {
			viewConversationIntent.putExtra(ConversationsActivity.EXTRA_DOWNLOAD_UUID, downloadMessageUuid);
			return PendingIntent.getActivity(mXmppConnectionService,
					generateRequestCode(conversationUuid, 8),
					viewConversationIntent,
					PendingIntent.FLAG_UPDATE_CURRENT);
		} else {
			return PendingIntent.getActivity(mXmppConnectionService,
					generateRequestCode(conversationUuid, 10),
					viewConversationIntent,
					PendingIntent.FLAG_UPDATE_CURRENT);
		}
	}

	private int generateRequestCode(String uuid, int actionId) {
		return (actionId * NOTIFICATION_ID_MULTIPLIER) + (uuid.hashCode() % NOTIFICATION_ID_MULTIPLIER);
	}

	private int generateRequestCode(Conversational conversation, int actionId) {
		return generateRequestCode(conversation.getUuid(), actionId);
	}

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

	private PendingIntent createContentIntent(final Conversational 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, generateRequestCode(conversation, 20), 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);
		final int id = generateRequestCode(conversation, dismissAfterReply ? 12 : 14);
		return PendingIntent.getService(mXmppConnectionService, id, intent, 0);
	}

	private PendingIntent createReadPendingIntent(Conversation conversation) {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_MARK_AS_READ);
		intent.putExtra("uuid", conversation.getUuid());
		intent.setPackage(mXmppConnectionService.getPackageName());
		return PendingIntent.getService(mXmppConnectionService, generateRequestCode(conversation, 16), intent, PendingIntent.FLAG_UPDATE_CURRENT);
	}

	public PendingIntent createSnoozeIntent(Conversation conversation) {
		final Intent intent = new Intent(mXmppConnectionService, XmppConnectionService.class);
		intent.setAction(XmppConnectionService.ACTION_SNOOZE);
		intent.putExtra("uuid", conversation.getUuid());
		intent.setPackage(mXmppConnectionService.getPackageName());
		return PendingIntent.getService(mXmppConnectionService, generateRequestCode(conversation, 22), intent, PendingIntent.FLAG_UPDATE_CURRENT);
	}

	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) {
		if (message.getConversation() instanceof Conversation) {
			Conversation conversation = (Conversation) message.getConversation();
			final String nick = conversation.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);
		} else {
			return false;
		}
	}

	public static Pattern generateNickHighlightPattern(final String nick) {
		return Pattern.compile("(?<=(^|\\s))" + Pattern.quote(nick) + "\\b");
	}

	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.isEnabled()) {
					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);
		return mBuilder.build();
	}

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

	public void updateErrorNotification() {
		if (Config.SUPPRESS_ERROR_NOTIFICATION) {
			cancel(ERROR_NOTIFICATION_ID);
			return;
		}
		final List<Account> errors = new ArrayList<>();
		for (final Account account : mXmppConnectionService.getAccounts()) {
			if (account.hasErrorStatus() && account.showErrorNotification()) {
				errors.add(account);
			}
		}
		if (mXmppConnectionService.keepForegroundService()) {
			notify(FOREGROUND_NOTIFICATION_ID, createForegroundNotification());
		}
		final NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mXmppConnectionService);
		if (errors.size() == 0) {
			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().asBareJid().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_PRIVATE);
		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.setLocalOnly(true);
		mBuilder.setPriority(NotificationCompat.PRIORITY_LOW);
		mBuilder.setContentIntent(PendingIntent.getActivity(mXmppConnectionService,
				145,
				new Intent(mXmppConnectionService, ManageAccountActivity.class),
				PendingIntent.FLAG_UPDATE_CURRENT));
		notify(ERROR_NOTIFICATION_ID, mBuilder.build());
	}

	public Notification updateFileAddingNotification(int current, Message message) {
		NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mXmppConnectionService);
		mBuilder.setContentTitle(mXmppConnectionService.getString(R.string.transcoding_video));
		mBuilder.setProgress(100, current, false);
		mBuilder.setSmallIcon(R.drawable.ic_hourglass_empty_white_24dp);
		mBuilder.setContentIntent(createContentIntent(message.getConversation()));
		Notification notification = mBuilder.build();
		notify(FOREGROUND_NOTIFICATION_ID, notification);
		return notification;
	}

	private void notify(String tag, int id, Notification notification) {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		try {
			notificationManager.notify(tag, id, notification);
		} catch (RuntimeException e) {
			Log.d(Config.LOGTAG, "unable to make notification", e);
		}
	}

	private void notify(int id, Notification notification) {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		try {
			notificationManager.notify(id, notification);
		} catch (RuntimeException e) {
			Log.d(Config.LOGTAG, "unable to make notification", e);
		}
	}

	private void cancel(int id) {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		try {
			notificationManager.cancel(id);
		} catch (RuntimeException e) {
			Log.d(Config.LOGTAG, "unable to cancel notification", e);
		}
	}

	private void cancel(String tag, int id) {
		final NotificationManagerCompat notificationManager = NotificationManagerCompat.from(mXmppConnectionService);
		try {
			notificationManager.cancel(tag, id);
		} catch (RuntimeException e) {
			Log.d(Config.LOGTAG, "unable to cancel notification", e);
		}
	}
}