/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.server;

import com.juick.User;
import com.juick.formatters.PlainTextFormatter;
import com.juick.server.www.WebApp;
import com.juick.service.component.*;
import com.juick.model.CommandResult;
import com.juick.server.xmpp.iq.MessageQuery;
import com.juick.service.*;
import com.juick.util.MessageUtils;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import rocks.xmpp.addr.Jid;
import rocks.xmpp.core.XmppException;
import rocks.xmpp.core.session.Extension;
import rocks.xmpp.core.session.XmppSession;
import rocks.xmpp.core.session.XmppSessionConfiguration;
import rocks.xmpp.core.session.debug.LogbackDebugger;
import rocks.xmpp.core.stanza.AbstractIQHandler;
import rocks.xmpp.core.stanza.model.*;
import rocks.xmpp.core.stanza.model.client.ClientMessage;
import rocks.xmpp.core.stanza.model.client.ClientPresence;
import rocks.xmpp.core.stanza.model.errors.Condition;
import rocks.xmpp.extensions.caps.EntityCapabilitiesManager;
import rocks.xmpp.extensions.component.accept.ExternalComponent;
import rocks.xmpp.extensions.disco.ServiceDiscoveryManager;
import rocks.xmpp.extensions.disco.model.info.Identity;
import rocks.xmpp.extensions.filetransfer.FileTransfer;
import rocks.xmpp.extensions.filetransfer.FileTransferManager;
import rocks.xmpp.extensions.nick.model.Nickname;
import rocks.xmpp.extensions.oob.model.x.OobX;
import rocks.xmpp.extensions.ping.PingManager;
import rocks.xmpp.extensions.receipts.MessageDeliveryReceiptsManager;
import rocks.xmpp.extensions.vcard.temp.model.VCard;
import rocks.xmpp.extensions.version.SoftwareVersionManager;
import rocks.xmpp.extensions.version.model.SoftwareVersion;
import rocks.xmpp.util.XmppUtils;

import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.xml.bind.JAXBException;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Duration;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;

/**
 * @author ugnich
 */
public class XMPPManager implements NotificationListener {

    private static final Logger logger = LoggerFactory.getLogger("com.juick.server.xmpp");

    private ExternalComponent router;
    @Inject
    private CommandsManager commandsManager;
    @Value("${xmppbot_jid:juick@localhost}")
    private Jid jid;
    @Value("${hostname:localhost}")
    private String componentName;
    @Value("${component_port:5347}")
    private int componentPort;
    @Value("${component_host:localhost}")
    private String componentHost;
    @Value("${xmpp_password:secret}")
    private String password;
    @Value("${upload_tmp_dir:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String tmpDir;

    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;
    @Inject
    private PMQueriesService pmQueriesService;
    @Inject
    private ExecutorService executorService;
    @Value("${service_user:juick}")
    private String serviceUsername;
    @Inject
    private WebApp webApp;

    private User serviceUser;

    @PostConstruct
    public void init() {
        logger.info("stream router start connecting to {}", componentPort);
        XmppSessionConfiguration configuration = XmppSessionConfiguration.builder()
                .extensions(Extension.of(com.juick.Message.class), Extension.of(MessageQuery.class))
                .debugger(LogbackDebugger.class)
                .defaultResponseTimeout(Duration.ofMillis(120000))
                .build();
        router = ExternalComponent.create(componentName, password, configuration, componentHost, componentPort);
        ServiceDiscoveryManager serviceDiscoveryManager = router.getManager(ServiceDiscoveryManager.class);
        serviceDiscoveryManager.addIdentity(Identity.clientBot().withName("Juick"));
        EntityCapabilitiesManager entityCapabilitiesManager = router.getManager(EntityCapabilitiesManager.class);
        entityCapabilitiesManager.setNode("https://juick.com/caps");
        MessageDeliveryReceiptsManager messageDeliveryReceiptsManager = router.getManager(MessageDeliveryReceiptsManager.class);
        messageDeliveryReceiptsManager.setEnabled(true);
        PingManager pingManager = router.getManager(PingManager.class);
        pingManager.setEnabled(true);
        SoftwareVersionManager softwareVersionManager = router.getManager(SoftwareVersionManager.class);
        softwareVersionManager.setSoftwareVersion(new SoftwareVersion("Juick", "2.x",
                System.getProperty("os.name", "generic")));
        VCard vCard = new VCard();
        vCard.setFormattedName("Juick");
        vCard.setBirthday(LocalDate.of(2008, 10, 22));
        try {
            vCard.setUrl(new URL("http://juick.com/"));
            vCard.setPhoto(new VCard.Image("image/png", IOUtils.toByteArray(
                    getClass().getClassLoader().getResource("juick.png"))));
        } catch (MalformedURLException e) {
            logger.error("invalid url", e);
        } catch (IOException e) {
            logger.warn("invalid resource", e);
        }
        router.addIQHandler(MessageQuery.class, iq -> {
            Message warningMessage = new Message(iq.getFrom(), Message.Type.CHAT);
            warningMessage.setFrom(jid);
            warningMessage.setBody("Your XMPP client constantly polls us with XMPP query which is unsupported for years, please find http://juick.com/query#messages in your client code and remove that");
            router.send(warningMessage);
            return iq.createError(new StanzaError(Condition.BAD_REQUEST, "Please stop this spam"));
        });
        router.addIQHandler(VCard.class, new AbstractIQHandler(IQ.Type.GET) {
            @Override
            protected IQ processRequest(IQ iq) {
                if (iq.getTo().equals(jid) || iq.getTo().asBareJid().equals(jid.asBareJid())
                        || iq.getTo().asBareJid().toEscapedString().equals(jid.getDomain())) {
                    return iq.createResult(vCard);
                }
                User user = userService.getUserByName(iq.getTo().getLocal());
                if (!user.isAnonymous()) {
                    User info = userService.getUserInfo(user);
                    VCard userVCard = new VCard();
                    userVCard.setFormattedName(info.getFullName());
                    userVCard.setNickname(user.getName());
                    try {
                        userVCard.setPhoto(new VCard.Image(URI.create(webApp.getAvatarUrl(user))));
                        if (info.getUrl() != null) {
                            userVCard.setUrl(new URL(info.getUrl()));
                        }
                    } catch (MalformedURLException e) {
                        logger.warn("url exception", e);
                    }
                    return iq.createResult(userVCard);
                }
                return iq.createError(Condition.BAD_REQUEST);
            }
        });
        router.addInboundMessageListener(e -> {
            ClientMessage result = incomingMessage(e.getMessage());
            if (result != null) {
                router.send(result);
            }
        });
        FileTransferManager fileTransferManager = router.getManager(FileTransferManager.class);
        fileTransferManager.addFileTransferOfferListener(e -> {
            try {
                List<String> allowedTypes = new ArrayList<String>() {{
                    add("png");
                    add("jpg");
                }};
                String attachmentExtension = FilenameUtils.getExtension(e.getName()).toLowerCase();
                String targetFilename = String.format("%s.%s",
                        DigestUtils.md5Hex(String.format("%s-%s",
                                e.getInitiator().toString(), e.getSessionId()).getBytes()), attachmentExtension);
                if (allowedTypes.contains(attachmentExtension)) {
                    Path filePath = Paths.get(tmpDir, targetFilename);
                    FileTransfer ft = e.accept(filePath).get();
                    ft.addFileTransferStatusListener(st -> {
                        logger.debug("{}: received {} of {}", e.getName(), st.getBytesTransferred(), e.getSize());
                        if (st.getStatus().equals(FileTransfer.Status.COMPLETED)) {
                            logger.info("transfer completed");
                            try {
                                Jid initiator = e.getInitiator();
                                ClientMessage result = incomingMessageJuick(
                                        userService.getUserByJID(initiator.asBareJid().toEscapedString()), initiator,
                                        jid.getLocal(), StringUtils.defaultString(e.getDescription()).trim(), URI.create(String.format("juick://%s", targetFilename)));
                                if (result != null) {
                                    router.send(result);
                                }
                            } catch (Exception e1) {
                                logger.error("ft error", e1);
                            }

                        } else if (st.getStatus().equals(FileTransfer.Status.FAILED)) {
                            logger.info("transfer failed", ft.getException());
                            Message msg = new Message();
                            msg.setType(Message.Type.CHAT);
                            msg.setFrom(jid);
                            msg.setTo(e.getInitiator());
                            msg.setBody("File transfer failed, please report to us");
                            router.sendMessage(msg);
                        } else if (st.getStatus().equals(FileTransfer.Status.CANCELED)) {
                            logger.info("transfer cancelled");
                        }
                    });
                    ft.transfer();
                    logger.info("transfer started");
                } else {
                    e.reject();
                    logger.info("transfer rejected");
                }
            } catch (IOException | InterruptedException | ExecutionException e1) {
                logger.error("ft error", e1);
            }
        });
        router.addConnectionListener(event -> {
            if (event.getType().equals(rocks.xmpp.core.session.ConnectionEvent.Type.RECONNECTION_SUCCEEDED)) {
                logger.info("component connected");
            }
        });
        router.addSessionStatusListener(event -> {
            logger.info("event: " + event.getStatus(), event.getThrowable());
            if (event.getStatus().equals(XmppSession.Status.AUTHENTICATED)) {
                logger.info("Authenticated, broadcasting...");
                broadcastPresence(null);
            }
        });
        router.addInboundPresenceListener(event -> {
            incomingPresence(event.getPresence());
        });
        executorService.submit(() -> {
            try {
                router.connect();
            } catch (XmppException e) {
                logger.warn("xmpp exception", e);
            }
        });
        serviceUser = userService.getUserByName(serviceUsername);
    }

    private void sendJuickMessage(com.juick.Message jmsg, List<User> users) {
        List<String> jids = new ArrayList<>();

        for (User user : users) {
            jids.addAll(userService.getJIDsbyUID(user.getUid()));
        }
        com.juick.Message fullMsg = messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
        String txt = "@" + jmsg.getUser().getName() + ":" + MessageUtils.getTagsString(fullMsg) + "\n";
        String attachmentUrl = MessageUtils.attachmentUrl(fullMsg);
        if (StringUtils.isNotEmpty(attachmentUrl)) {
            txt += attachmentUrl + "\n";
        }
        txt += StringUtils.defaultString(jmsg.getText()) + "\n\n";
        txt += "#" + jmsg.getMid() + " http://juick.com/m/" + jmsg.getMid();

        Nickname nick = new Nickname("@" + jmsg.getUser().getName());

        Message msg = new Message();
        msg.setFrom(jid);
        msg.setBody(txt);
        msg.setType(Message.Type.CHAT);
        msg.setThread("juick-" + jmsg.getMid());
        msg.addExtension(jmsg);
        msg.addExtension(nick);
        if (StringUtils.isNotEmpty(attachmentUrl)) {
            try {
                OobX oob = new OobX(new URI(attachmentUrl));
                msg.addExtension(oob);
            } catch (URISyntaxException e) {
                logger.warn("uri exception", e);
            }
        }
        for (String jid : jids) {
            msg.setTo(Jid.of(jid));
            router.send(ClientMessage.from(msg));
        }
    }

    private void sendJuickComment(com.juick.Message jmsg, List<User> users) {
        String replyQuote;
        String replyTo;

        com.juick.Message replyMessage = jmsg.getReplyto() > 0 ? messagesService.getReply(jmsg.getMid(), jmsg.getReplyto())
                : messagesService.getMessage(jmsg.getMid()).orElseThrow(IllegalStateException::new);
        replyTo = replyMessage.getUser().getName();
        com.juick.Message fullReply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
        replyQuote = StringUtils.defaultString(fullReply.getReplyQuote());

        String txt = "Reply by @" + jmsg.getUser().getName() + ":\n" + replyQuote + "\n@" + replyTo + " ";
        String attachmentUrl = MessageUtils.attachmentUrl(fullReply);
        if (StringUtils.isNotEmpty(attachmentUrl)) {
            txt += attachmentUrl + "\n";
        }
        txt += StringUtils.defaultString(jmsg.getText()) + "\n\n" + "#" + jmsg.getMid() + "/" + jmsg.getRid() + " http://juick.com/m/" + jmsg.getMid() + "#" + jmsg.getRid();

        Message msg = new Message();
        msg.setFrom(jid);
        msg.setBody(txt);
        msg.setType(Message.Type.CHAT);
        msg.addExtension(jmsg);
        for (User user : users) {
            for (String jid : userService.getJIDsbyUID(user.getUid())) {
                msg.setTo(Jid.of(jid));
                router.send(ClientMessage.from(msg));
            }
        }
    }

    @Override
    public void processMessageEvent(MessageEvent event) {
        com.juick.Message msg = event.getMessage();
        List<User> subscribers = event.getUsers();
        if (msg.isService()) {
            return;
        }
        if (MessageUtils.isPM(msg)) {
            userService.getJIDsbyUID(msg.getTo().getUid())
                    .forEach(userJid -> {
                        Message mm = new Message();
                        mm.setTo(Jid.of(userJid));
                        mm.setType(Message.Type.CHAT);
                        boolean inroster = pmQueriesService.havePMinRoster(msg.getUser().getUid(), userJid);
                        if (inroster) {
                            mm.setFrom(Jid.of(msg.getUser().getName(), "juick.com", "Juick"));
                            mm.setBody(msg.getText());
                        } else {
                            mm.setFrom(jid);
                            mm.setBody("Private message from @" + msg.getUser().getName() + ":\n" + msg.getText());
                        }
                        router.send(ClientMessage.from(mm));
                    });
        } else if (MessageUtils.isReply(msg)) {
            sendJuickComment(msg, subscribers);
        }
        else {
            sendJuickMessage(msg, subscribers);
        }
    }

    private ClientMessage makeReply(Jid jidTo, String txt) {
        Message reply = new Message();
        reply.setFrom(jid);
        reply.setTo(jidTo);
        reply.setType(Message.Type.CHAT);
        reply.setBody(txt);
        return ClientMessage.from(reply);
    }

    @Override
    public void processSubscribeEvent(SubscribeEvent subscribeEvent) {

    }

    @Override
    public void processLikeEvent(LikeEvent likeEvent) {
        List<User> users = likeEvent.getSubscribers();
        com.juick.Message jmsg = likeEvent.getMessage();
        User liker = likeEvent.getUser();

        if (!userService.isInBLAny(jmsg.getUser().getUid(), liker.getUid())) {
            userService.getJIDsbyUID(jmsg.getUser().getUid()).forEach(authorJid -> {
                Message xmppMessage = new Message();
                xmppMessage.setFrom(jid);
                xmppMessage.setTo(Jid.of(authorJid));
                xmppMessage.setType(Message.Type.CHAT);
                xmppMessage.addExtension(jmsg);
                xmppMessage.setBody(String.format("%s recommended your post #%d. %s",
                        liker.getName(), jmsg.getMid(), PlainTextFormatter.formatUrl(jmsg)));
                router.send(ClientMessage.from(xmppMessage));
            });
        }

        String txt = "Recommended by @" + liker.getName() + ":\n";
        txt += "@" + jmsg.getUser().getName() + ":" + MessageUtils.getTagsString(jmsg) + "\n";
        String attachmentUrl = MessageUtils.attachmentUrl(jmsg);
        if (StringUtils.isNotEmpty(attachmentUrl)) {
            txt += attachmentUrl + "\n";
        }
        txt += StringUtils.defaultString(jmsg.getText()) + "\n\n";
        txt += "#" + jmsg.getMid();
        if (jmsg.getReplies() > 0) {
            if (jmsg.getReplies() % 10 == 1 && jmsg.getReplies() % 100 != 11) {
                txt += " (" + jmsg.getReplies() + " reply)";
            } else {
                txt += " (" + jmsg.getReplies() + " replies)";
            }
        }
        txt += " http://juick.com/m/" + jmsg.getMid();

        Nickname nick = new Nickname("@" + jmsg.getUser().getName());

        Message msg = new Message();
        msg.setFrom(jid);
        msg.setBody(txt);
        msg.setType(Message.Type.CHAT);
        msg.setThread("juick-" + jmsg.getMid());
        msg.addExtension(jmsg);
        msg.addExtension(nick);
        if (StringUtils.isNotEmpty(attachmentUrl)) {
            try {
                OobX oob = new OobX(new URI(attachmentUrl));
                msg.addExtension(oob);
            } catch (URISyntaxException e) {
                logger.warn("uri exception", e);
            }
        }

        for (User user : users) {
            for (String jid : userService.getJIDsbyUID(user.getUid())) {
                msg.setTo(Jid.of(jid));
                router.send(ClientMessage.from(msg));
            }
        }
    }

    @Override
    public void processPingEvent(PingEvent pingEvent) {
        userService.getJIDsbyUID(pingEvent.getPinger().getUid())
                .forEach(userJid -> {
                    Presence p = new Presence(Jid.of(userJid));
                    p.setFrom(jid);
                    p.setPriority((byte) 10);
                    router.send(ClientPresence.from(p));
                });
    }

    @Override
    public void processMessageReadEvent(MessageReadEvent messageReadEvent) {

    }

    @Override
    public void processTopEvent(TopEvent topEvent) {
        com.juick.Message message = topEvent.getMessage();
        try {
            commandsManager.processCommand(serviceUser, String.format("! #%d", message.getMid()), URI.create(StringUtils.EMPTY));
        } catch (Exception e) {
            logger.warn("XMPP error", e);
        }
    }

    private void incomingPresence(Presence p) {
        final String username = p.getTo().getLocal();
        final boolean toJuick = username.equals(jid.getLocal());

        if (p.getType() == null) {
            Presence reply = new Presence();
            reply.setFrom(p.getTo().asBareJid());
            reply.setTo(p.getFrom().asBareJid());
            reply.setType(Presence.Type.UNSUBSCRIBE);
            router.send(ClientPresence.from(reply));
        } else if (p.getType().equals(Presence.Type.PROBE)) {
            int uid_to = 0;
            if (!toJuick) {
                uid_to = userService.getUIDbyName(username);
            } else {
                User visitor = userService.getUserByJID(p.getFrom().asBareJid().toEscapedString());
                if (visitor != null) {
                    userService.updateLastSeen(visitor);
                }
            }

            if (toJuick || uid_to > 0) {
                Presence reply = new Presence();
                reply.setFrom(p.getTo().withResource(jid.getResource()));
                reply.setTo(p.getFrom());
                reply.setPriority((byte)10);
                if (!userService.getActiveJIDs().contains(p.getFrom().asBareJid().toEscapedString())) {
                    reply.setStatus("Send ON to enable notifications");
                }
                router.send(ClientPresence.from(reply));
            } else {
                Presence reply = new Presence();
                reply.setFrom(p.getTo());
                reply.setTo(p.getFrom());
                reply.setType(Presence.Type.ERROR);
                reply.setId(p.getId());
                reply.setError(new StanzaError(StanzaError.Type.CANCEL, Condition.ITEM_NOT_FOUND));
                router.send(ClientPresence.from(reply));
            }
        } else if (p.getType().equals(Presence.Type.SUBSCRIBE)) {
            boolean canSubscribe = false;
            if (toJuick) {
                canSubscribe = true;
            } else {
                int uid_to = userService.getUIDbyName(username);
                if (uid_to > 0) {
                    pmQueriesService.addPMinRoster(uid_to, p.getFrom().asBareJid().toEscapedString());
                    canSubscribe = true;
                }
            }
            if (canSubscribe) {
                Presence reply = new Presence();
                reply.setFrom(p.getTo());
                reply.setTo(p.getFrom());
                reply.setType(Presence.Type.SUBSCRIBED);
                router.send(ClientPresence.from(reply));

                reply.setFrom(reply.getFrom().withResource(jid.getResource()));
                reply.setPriority((byte) 10);
                reply.setType(null);
                router.send(ClientPresence.from(reply));
            } else {
                Presence reply = new Presence();
                reply.setFrom(p.getTo());
                reply.setTo(p.getFrom());
                reply.setType(Presence.Type.ERROR);
                reply.setId(p.getId());
                reply.setError(new StanzaError(StanzaError.Type.CANCEL, Condition.ITEM_NOT_FOUND));
                router.send(ClientPresence.from(reply));
            }
        } else if (p.getType().equals(Presence.Type.UNSUBSCRIBE)) {
            if (!toJuick) {
                int uid_to = userService.getUIDbyName(username);
                if (uid_to > 0) {
                    pmQueriesService.removePMinRoster(uid_to, p.getFrom().asBareJid().toEscapedString());
                }
            }

            Presence reply = new Presence();
            reply.setFrom(p.getTo());
            reply.setTo(p.getFrom());
            reply.setType(Presence.Type.UNSUBSCRIBED);
            router.send(ClientPresence.from(reply));
        }
    }

    public ClientMessage incomingMessage(Message msg) {
        ClientMessage result = null;
        if (msg.getType() != null && msg.getType().equals(Message.Type.ERROR)) {
            StanzaError error = msg.getError();
            if (error != null && error.getCondition().equals(Condition.RESOURCE_CONSTRAINT)) {
                // offline query is full, deactivating this jid
                if (userService.setActiveStatusForJID(msg.getFrom().toEscapedString(), UserService.ActiveStatus.Inactive)) {
                    logger.info("{} is inactive now", msg.getFrom());
                    return null;
                }
            }
            return null;
        }
        Jid to = msg.getTo();
        if (to.getDomain().equals(router.getDomain().toEscapedString()) || to.equals(this.jid)) {
            User user_from = userService.getUserByJID(msg.getFrom().asBareJid().toEscapedString());
            if ((user_from == null || user_from.isAnonymous()) && !msg.getFrom().equals(jid)) {
                String signuphash = userService.getSignUpHashByJID(msg.getFrom().asBareJid().toEscapedString());
                return makeReply(msg.getFrom(), "Для того, чтобы начать пользоваться сервисом, пожалуйста пройдите быструю регистрацию: http://juick.com/signup?type=xmpp&hash=" + signuphash + "\nЕсли у вас уже есть учетная запись на Juick, вы сможете присоединить этот JabberID к ней.\n\nTo start using Juick, please sign up: http://juick.com/signup?type=xmpp&hash=" + signuphash + "\nIf you already have an account on Juick, you will be proposed to attach this JabberID to your existing account.");
            }
            URI attachment = URI.create(StringUtils.EMPTY);
            OobX oobX = msg.getExtension(OobX.class);
            if (oobX != null) {
                attachment = oobX.getUri();
            }
            try {
                return incomingMessageJuick(user_from, msg.getFrom(), msg.getTo().getLocal(), StringUtils.defaultString(msg.getBody()).trim(), attachment);
            } catch (Exception e1) {
                logger.warn("message exception", e1);
            }
        } else {
            return ClientMessage.from(msg);
        }
        return result;
    }
    private ClientMessage incomingMessageJuick(User user_from, Jid from, String to, String command, @Nonnull URI attachment) {
        if (StringUtils.isBlank(command) && attachment.toString().isEmpty()) {
            return null;
        }

        messagesService.getUnread(user_from).forEach(mid -> messagesService.setRead(user_from, mid));

        int commandlen = command.length();

        // COMPATIBILITY
        if (commandlen > 7 && command.substring(0, 3).equalsIgnoreCase("PM ")) {
            command = command.substring(3);
        }

        if (!jid.getLocal().equals(to)) {
            // PM
            if (!StringUtils.isEmpty(command)) {
                commandsManager.commandPM(user_from, null, to, command);
                return null;
            }
        }

        try {
            CommandResult result = commandsManager.processCommand(user_from, command, attachment);
            if (StringUtils.isNotBlank(result.getText())) {
                return makeReply(from, result.getText());
            }
        } catch (Exception e) {
            logger.warn("xmpp command exception", e);
            return makeReply(from, "Error processing command");
        }
        return null;
    }

    private void broadcastPresence(Presence.Type type) {
        Presence presence = new Presence();
        presence.setFrom(jid);
        if (type != null) {
            presence.setType(type);
        }
        userService.getActiveJIDs().forEach(j -> {
            try {
                presence.setTo(Jid.of(j));
                router.send(ClientPresence.from(presence));
            } catch (IllegalArgumentException ex) {
                logger.warn("Invalid jid: {}", j, ex);
            }
        });
    }

    @PreDestroy
    public void close() throws Exception {
        broadcastPresence(Presence.Type.UNAVAILABLE);
        if (router != null) {
            router.close();
        }
    }
}