/*
 * 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.server.component.LikeEvent;
import com.juick.server.component.MessageEvent;
import com.juick.server.xmpp.s2s.BasicXmppSession;
import com.juick.server.helpers.UserInfo;
import com.juick.service.MessagesService;
import com.juick.service.SubscriptionService;
import com.juick.service.UserService;
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 org.springframework.context.ApplicationEventPublisher;
import org.springframework.stereotype.Component;
import rocks.xmpp.addr.Jid;
import rocks.xmpp.core.XmppException;
import rocks.xmpp.core.stanza.AbstractIQHandler;
import rocks.xmpp.core.stanza.model.IQ;
import rocks.xmpp.core.stanza.model.Message;
import rocks.xmpp.core.stanza.model.Stanza;
import rocks.xmpp.core.stanza.model.client.ClientMessage;
import rocks.xmpp.core.stanza.model.errors.Condition;
import rocks.xmpp.extensions.caps.model.EntityCapabilities;
import rocks.xmpp.extensions.component.accept.ExternalComponent;
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.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.PostConstruct;
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.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;

/**
 * @author ugnich
 */
@Component
public class XMPPConnection implements AutoCloseable {

    private static final Logger logger = LoggerFactory.getLogger(XMPPConnection.class);

    private ExternalComponent router;
    @Inject
    private XMPPServer xmpp;
    @Value("${xmppbot_jid:juick@localhost}")
    private Jid jid;

    @Value("${componentname:localhost}")
    private String componentName;
    @Value("${component_port:5347}")
    private int componentPort;
    @Value("${xmpp_password:secret}")
    private String password;
    @Value("${xmpp_disabled:false}")
    private boolean isXmppDisabled;
    @Value("${upload_tmp_dir:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String tmpDir;

    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;
    @Inject
    private SubscriptionService subscriptionService;
    @Inject
    private BasicXmppSession session;
    @Inject
    private ExecutorService service;
    @Inject
    private ApplicationEventPublisher applicationEventPublisher;

    @PostConstruct
    public void init() {
        logger.info("stream router start connecting to {}", componentPort);
        router = ExternalComponent.create(componentName, password, session.getConfiguration(), "localhost",
                componentPort);
        PingManager pingManager = router.getManager(PingManager.class);
        pingManager.setEnabled(true);
        router.disableFeature(EntityCapabilities.NAMESPACE);
        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");
        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(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.getUid() > 0) {
                    UserInfo info = userService.getUserInfo(user);
                    VCard userVCard = new VCard();
                    userVCard.setFormattedName(info.getFullName());
                    userVCard.setNickname(user.getName());
                    try {
                        userVCard.setPhoto(new VCard.Image(new URI("http://i.juick.com/a/" + user.getUid() + ".png")));
                        if (info.getUrl() != null) {
                            userVCard.setUrl(new URL(info.getUrl()));
                        }
                    } catch (MalformedURLException | URISyntaxException e) {
                        logger.warn("url exception", e);
                    }
                    return iq.createResult(userVCard);
                }
                return iq.createError(Condition.BAD_REQUEST);
            }
        });
        router.addInboundMessageListener(e -> {
            Message message = e.getMessage();
            Jid jid = message.getTo();
            if (jid.getDomain().equals(router.getDomain().toEscapedString())) {
                com.juick.Message jmsg = message.getExtension(com.juick.Message.class);
                if (jmsg != null) {
                    if (jid.getLocal().equals("recomm")) {
                        sendJuickRecommendation(jmsg);
                        User fromUser = jmsg.getUser();
                        com.juick.Message msg = messagesService.getMessage(jmsg.getMid());
                        applicationEventPublisher.publishEvent(new LikeEvent(this, fromUser, msg));
                    } else {
                        if (jmsg.getRid() > 0) {
                            // to get quote and attachment
                            com.juick.Message reply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
                            sendJuickComment(reply);
                            applicationEventPublisher.publishEvent(new MessageEvent(this, reply));
                        } else if (jmsg.getMid() > 0) {
                            sendJuickMessage(jmsg);
                            applicationEventPublisher.publishEvent(new MessageEvent(this,
                                    messagesService.getMessage(jmsg.getMid())));
                        }
                    }
                }
            } else if (jid.getDomain().endsWith(jid.getDomain()) && (jid.getDomain().equals(this.jid.getDomain())
                    || jid.getDomain().endsWith("." + jid.getDomain()))) {
                if (logger.isInfoEnabled()) {
                    try {
                        logger.info("unhandled message: {}", stanzaToString(message));
                    } catch (JAXBException | XMLStreamException ex) {
                        logger.error("JAXB exception", ex);
                    }
                }
            } else {
                route(ClientMessage.from(message));
            }
        });
        router.addInboundIQListener(e -> {
            IQ iq = e.getIQ();
            Jid jid = iq.getTo();
            if (!jid.getDomain().equals(this.jid.getDomain())) {
                route(iq);
            }
        });
        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");
                            Message msg = new Message();
                            msg.setType(Message.Type.CHAT);
                            msg.setFrom(e.getInitiator());
                            msg.setTo(jid);
                            msg.setBody(e.getDescription());
                            try {
                                String attachmentUrl = String.format("juick://%s", targetFilename);
                                msg.addExtension(new OobX(new URI(attachmentUrl), "!!!!Juick!!"));
                                router.sendMessage(msg);
                            } catch (URISyntaxException e1) {
                                logger.warn("attachment 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");
            }
        });
        if (!isXmppDisabled) {
            service.submit(() -> {
                try {
                    Thread.sleep(3000);
                    router.connect();
                } catch (InterruptedException | XmppException e) {
                    logger.warn("xmpp exception", e);
                }
            });
        }
    }

    String stanzaToString(Stanza stanza) throws XMLStreamException, JAXBException {
        StringWriter stanzaWriter = new StringWriter();
        XMLStreamWriter xmppStreamWriter = XmppUtils.createXmppStreamWriter(
                router.getConfiguration().getXmlOutputFactory().createXMLStreamWriter(stanzaWriter));
        router.createMarshaller().marshal(stanza, xmppStreamWriter);
        xmppStreamWriter.flush();
        xmppStreamWriter.close();
        return stanzaWriter.toString();
    }

    void route(Stanza stanza) {
        try {
            String xml = stanzaToString(stanza);
            logger.debug("stream router (out): {}", xml);
            xmpp.sendOut(stanza);
        } catch (XMLStreamException | JAXBException e) {
            logger.error("JAXB exception", e);
        }

    }

    public void sendStanza(Stanza xml) {
        router.send(xml);
    }



    public void sendJuickMessage(com.juick.Message jmsg) {
        List<String> jids = new ArrayList<>();

        if (jmsg.FriendsOnly) {
            jids = subscriptionService.getJIDSubscribedToUser(jmsg.getUser().getUid(), jmsg.FriendsOnly);
        } else {
            List<User> users = subscriptionService.getSubscribedUsers(jmsg.getUser().getUid(), jmsg.getMid());
            for (User user : users) {
                jids.addAll(userService.getJIDsbyUID(user.getUid()));
            }
        }
        com.juick.Message fullMsg = messagesService.getMessage(jmsg.getMid());
        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/" + 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));
            route(ClientMessage.from(msg));
        }
    }

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

        com.juick.Message op = messagesService.getMessage(jmsg.getMid());
        users = subscriptionService.getUsersSubscribedToComments(op, jmsg);
        com.juick.Message replyMessage = jmsg.getReplyto() > 0 ? messagesService.getReply(jmsg.getMid(), jmsg.getReplyto())
                : messagesService.getMessage(jmsg.getMid());
        replyTo = replyMessage.getUser().getName();
        com.juick.Message fullReply = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
        replyQuote = 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/" + 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));
                route(ClientMessage.from(msg));
            }
        }
    }

    public void sendJuickRecommendation(com.juick.Message recomm) {
        List<User> users;
        com.juick.Message jmsg = messagesService.getMessage(recomm.getMid());
        users = subscriptionService.getUsersSubscribedToUserRecommendations(recomm.getUser().getUid(),
                recomm.getMid(), jmsg.getUser().getUid());

        String txt = "Recommended by @" + recomm.getUser().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/" + 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));
                route(ClientMessage.from(msg));
            }
        }
    }

    @Override
    public void close() throws Exception {
        if (router != null) {
            router.close();
        }
    }

    public ExternalComponent getRouter() {
        return router;
    }
}