package com.juick.components;

import com.juick.User;
import com.juick.server.MessagesQueries;
import com.juick.server.SubscriptionsQueries;
import com.juick.server.UserQueries;
import com.juick.xmpp.*;
import com.juick.xmpp.extensions.JuickMessage;
import com.juick.xmpp.extensions.Nickname;
import com.juick.xmpp.extensions.XOOB;
import com.juick.xmpp.s2s.*;
import org.apache.commons.dbcp2.BasicDataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.xmlpull.v1.XmlPullParserException;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author ugnich
 */
public class XMPPComponent implements ServletContextListener, Stream.StreamListener,
        Message.MessageListener, Iq.IqListener, Presence.PresenceListener {

    private static final Logger logger = Logger.getLogger(XMPPComponent.class.getName());

    public final ExecutorService executorService = Executors.newCachedThreadPool();
    private StreamComponent router;
    JuickBot bot;

    public String HOSTNAME, componentName;
    public String STATSFILE = null;
    public String keystore;
    public String keystorePassword;
    public List<String> brokenSSLhosts;
    public List<String> bannedHosts;
    private final List<ConnectionIn> inConnections = Collections.synchronizedList(new ArrayList<>());
    private final List<ConnectionOut> outConnections = Collections.synchronizedList(new ArrayList<>());
    private final List<CacheEntry> outCache = Collections.synchronizedList(new ArrayList<>());
    private JdbcTemplate sql;
    final public HashMap<String, StanzaChild> childParsers = new HashMap<>();

    public void addConnectionIn(ConnectionIn c) {
        synchronized (getInConnections()) {
            getInConnections().add(c);
        }
    }

    public void addConnectionOut(ConnectionOut c) {
        synchronized (getOutConnections()) {
            getOutConnections().add(c);
        }
    }

    public void removeConnectionIn(ConnectionIn c) {
        synchronized (getInConnections()) {
            getInConnections().remove(c);
        }
    }

    public void removeConnectionOut(ConnectionOut c) {
        synchronized (getOutConnections()) {
            getOutConnections().remove(c);
        }
    }

    public String getFromCache(String hostname) {
        CacheEntry ret = null;
        synchronized (getOutCache()) {
            for (Iterator<CacheEntry> i = getOutCache().iterator(); i.hasNext();) {
                CacheEntry c = i.next();
                if (c.hostname != null && c.hostname.equals(hostname)) {
                    ret = c;
                    i.remove();
                    break;
                }
            }
        }
        return (ret != null) ? ret.xml : null;
    }

    public ConnectionOut getConnectionOut(String hostname, boolean needReady) {
        synchronized (getOutConnections()) {
            for (ConnectionOut c : getOutConnections()) {
                if (c.to != null && c.to.equals(hostname) && (!needReady || c.streamReady)) {
                    return c;
                }
            }
        }
        return null;
    }

    public ConnectionIn getConnectionIn(String streamID) {
        synchronized (getInConnections()) {
            for (ConnectionIn c : getInConnections()) {
                if (c.streamID != null && c.streamID.equals(streamID)) {
                    return c;
                }
            }
        }
        return null;
    }

    public void sendOut(Stanza s) {
        sendOut(s.to.Host, s.toString());
    }

    public void sendOut(String hostname, String xml) {
        boolean haveAnyConn = false;

        ConnectionOut connOut = null;
        synchronized (getOutConnections()) {
            for (ConnectionOut c : getOutConnections()) {
                if (c.to != null && c.to.equals(hostname)) {
                    if (c.streamReady) {
                        connOut = c;
                        break;
                    } else {
                        haveAnyConn = true;
                        break;
                    }
                }
            }
        }
        if (connOut != null) {
            try {
                connOut.sendStanza(xml);
            } catch (IOException e) {
                logger.warning("STREAM TO " + connOut.to + " " + connOut.streamID + " ERROR: " + e.toString());
            }
            return;
        }

        boolean haveCache = false;
        synchronized (getOutCache()) {
            for (CacheEntry c : getOutCache()) {
                if (c.hostname != null && c.hostname.equals(hostname)) {
                    c.xml += xml;
                    c.tsUpdated = System.currentTimeMillis();
                    haveCache = true;
                    break;
                }
            }
            if (!haveCache) {
                getOutCache().add(new CacheEntry(hostname, xml));
            }
        }

        if (!haveAnyConn) {
            try {
                ConnectionOut connectionOut = new ConnectionOut(this, hostname);
                executorService.submit(connectionOut);
            } catch (CertificateException | UnrecoverableKeyException | NoSuchAlgorithmException | XmlPullParserException | KeyStoreException | KeyManagementException | IOException e) {
                logger.log(Level.SEVERE, "s2s out error", e);
            }
        }
    }

    @Override
    public void contextInitialized(ServletContextEvent sce) {

        logger.info("component initialized");
        Properties conf = new Properties();
        try {
            conf.load(sce.getServletContext().getResourceAsStream("/WEB-INF/juick.conf"));
            HOSTNAME = conf.getProperty("hostname");
            componentName = conf.getProperty("componentname");
            JID Jid = new JID(conf.getProperty("xmppbot_jid"));
            STATSFILE = conf.getProperty("statsfile");
            keystore = conf.getProperty("keystore");
            keystorePassword = conf.getProperty("keystore_password");
            brokenSSLhosts = Arrays.asList(conf.getProperty("broken_ssl_hosts", "").split(","));
            bannedHosts = Arrays.asList(conf.getProperty("banned_hosts", "").split(","));
            BasicDataSource dataSource = new BasicDataSource();
            dataSource.setDriverClassName(conf.getProperty("datasource_driver", "com.mysql.jdbc.Driver"));
            dataSource.setUrl(conf.getProperty("datasource_url"));
            setSql(new JdbcTemplate(dataSource));
            bot = new JuickBot(this, Jid);

            childParsers.put(JuickMessage.XMLNS, new JuickMessage());

            executorService.submit(() -> {
                Socket routerSocket = null;
                try {
                    routerSocket = new Socket("localhost", 5347);
                    setRouter(new StreamComponent(new JID("s2s"), routerSocket.getInputStream(), routerSocket.getOutputStream(), conf.getProperty("xmpp_password")));
                    getRouter().addChildParser(new JuickMessage());
                    getRouter().addListener((Stream.StreamListener) this);
                    getRouter().addListener((Message.MessageListener) this);
                    getRouter().addListener((Iq.IqListener) this);
                    getRouter().startParsing();
                } catch (IOException e) {
                    logger.log(Level.SEVERE, "router error", e);
                }
            });
            executorService.submit(() -> {
                final ServerSocket listener = new ServerSocket(5269);
                logger.info("s2s listener ready");
                while (true) {
                    try {
                        Socket socket = listener.accept();
                        ConnectionIn client = new ConnectionIn(this, bot, socket);
                        addConnectionIn(client);
                        executorService.submit(client);
                    } catch (Exception e) {
                        logger.log(Level.SEVERE, "s2s error", e);
                    }
                }
            });
            executorService.submit(new CleaningUp(this));

        } catch (Exception e) {
            logger.log(Level.SEVERE, "XMPPComponent error", e);
        }
    }



    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        synchronized (getOutConnections()) {
            for (Iterator<ConnectionOut> i = getOutConnections().iterator(); i.hasNext();) {
                ConnectionOut c = i.next();
                c.closeConnection();
                i.remove();
            }
        }

        synchronized (getInConnections()) {
            for (Iterator<ConnectionIn> i = getInConnections().iterator(); i.hasNext();) {
                ConnectionIn c = i.next();
                c.closeConnection();
                i.remove();
            }
        }

        try {
            closeRouterConnection();
        } catch (IOException e) {
            logger.log(Level.WARNING, "router warning", e);
        }
        executorService.shutdown();
        logger.info("component destroyed");
    }
    public void closeRouterConnection() throws IOException {
        getRouter().logoff();
    }

    public void sendJuickMessage(JuickMessage jmsg) {
        List<String> jids = new ArrayList<>();

        if (jmsg.FriendsOnly) {
            jids = SubscriptionsQueries.getJIDSubscribedToUser(getSql(), jmsg.getUser().getUID(), jmsg.FriendsOnly);
        } else {
            List<User> users = SubscriptionsQueries.getSubscribedUsers(getSql(), jmsg.getUser().getUID(), jmsg.getMID());
            for (User user : users) {
                for (String jid : UserQueries.getJIDsbyUID(getSql(), user.getUID())) {
                    jids.add(jid);
                }
            }
        }

        String txt = "@" + jmsg.getUser().getUName() + ":" + jmsg.getTagsString() + "\n";
        String attachment = jmsg.getAttachmentURL();
        if (attachment != null) {
            txt += attachment + "\n";
        }
        txt += jmsg.getText() + "\n\n";
        txt += "#" + jmsg.getMID() + " http://juick.com/" + jmsg.getMID();

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

        com.juick.xmpp.Message msg = new com.juick.xmpp.Message();
        msg.from = bot.JuickJID;
        msg.body = txt;
        msg.type = Message.Type.chat;
        msg.thread = "juick-" + jmsg.getMID();
        msg.addChild(jmsg);
        msg.addChild(nick);
        if (attachment != null) {
            XOOB oob = new XOOB();
            oob.URL = attachment;
            msg.addChild(oob);
        }

        for (String jid : jids) {
            msg.to = new JID(jid);
            sendOut(msg);
        }
    }

    public void sendJuickComment(JuickMessage jmsg) {
        List<User> users;
        String replyQuote;
        String replyTo;

        users = SubscriptionsQueries.getUsersSubscribedToComments(getSql(), jmsg.getMID(), jmsg.getUser().getUID());
        com.juick.Message replyMessage = jmsg.ReplyTo > 0 ? MessagesQueries.getReply(getSql(), jmsg.getMID(), jmsg.ReplyTo)
                : MessagesQueries.getMessage(getSql(), jmsg.getMID());
        replyTo = replyMessage.getUser().getUName();
        replyQuote = getReplyQuote(replyMessage);

        String txt = "Reply by @" + jmsg.getUser().getUName() + ":\n" + replyQuote + "\n@" + replyTo + " ";
        String attachment = jmsg.getAttachmentURL();
        if (attachment != null) {
            txt += attachment + "\n";
        }
        txt += jmsg.getText() + "\n\n" + "#" + jmsg.getMID() + "/" + jmsg.getRID() + " http://juick.com/" + jmsg.getMID() + "#" + jmsg.getRID();

        com.juick.xmpp.Message msg = new com.juick.xmpp.Message();
        msg.from = bot.JuickJID;
        msg.body = txt;
        msg.type = Message.Type.chat;
        msg.addChild(jmsg);
        for (User user : users) {
            for (String jid : UserQueries.getJIDsbyUID(getSql(), user.getUID())) {
                msg.to = new JID(jid);
                sendOut(msg);
            }
        }
    }

    private String getReplyQuote(com.juick.Message q) {
        String quote = q.getText();
        if (quote.length() > 50) {
            quote = ">" + quote.substring(0, 47).replace('\n', ' ') + "...\n";
        } else if (quote.length() > 0) {
            quote = ">" + quote.replace('\n', ' ') + "\n";
        }
        return quote;
    }

    public void sendJuickRecommendation(JuickMessage recomm) {
        List<User> users;
        JuickMessage jmsg;
        jmsg = new JuickMessage(MessagesQueries.getMessage(getSql(), recomm.getMID()));
        users = SubscriptionsQueries.getUsersSubscribedToUserRecommendations(getSql(),
                recomm.getUser().getUID(), recomm.getMID(), jmsg.getUser().getUID());

        String txt = "Recommended by @" + recomm.getUser().getUName() + ":\n";
        txt += "@" + jmsg.getUser().getUName() + ":" + jmsg.getTagsString() + "\n";
        String attachment = jmsg.getAttachmentURL();
        if (attachment != null) {
            txt += attachment + "\n";
        }
        txt += jmsg.getText() + "\n\n";
        txt += "#" + jmsg.getMID();
        if (jmsg.Replies > 0) {
            if (jmsg.Replies % 10 == 1 && jmsg.Replies % 100 != 11) {
                txt += " (" + jmsg.Replies + " reply)";
            } else {
                txt += " (" + jmsg.Replies + " replies)";
            }
        }
        txt += " http://juick.com/" + jmsg.getMID();

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

        com.juick.xmpp.Message msg = new com.juick.xmpp.Message();
        msg.from = bot.JuickJID;
        msg.body = txt;
        msg.type = Message.Type.chat;
        msg.thread = "juick-" + jmsg.getMID();
        msg.addChild(jmsg);
        msg.addChild(nick);
        if (attachment != null) {
            XOOB oob = new XOOB();
            oob.URL = attachment;
            msg.addChild(oob);
        }

        for (User user : users) {
            for (String jid : UserQueries.getJIDsbyUID(getSql(), user.getUID())) {
                msg.to = new JID(jid);
                sendOut(msg);
            }
        }
    }

    @Override
    public boolean onIq(Iq iq) {
        JID jid = iq.to;
        if (!jid.Host.equals(componentName)) {
            logger.info("STREAM ROUTER (IQ): " + iq.toString());
            sendOut(iq);
        }
        return false;
    }

    @Override
    public void onMessage(Message xmsg) {
        logger.info("STREAM ROUTER (PROCESS): " + xmsg.toString());
        JuickMessage jmsg = (JuickMessage) xmsg.getChild(JuickMessage.XMLNS);
        JID jid = xmsg.to;
        if (jid.Host.equals(componentName)) {
            if (jmsg != null) {
                if (jid.Username != null && jid.Username.equals("recomm")) {
                    sendJuickRecommendation(jmsg);
                } else {
                    if (jmsg.getRID() > 0) {
                        sendJuickComment(jmsg);
                    } else if (jmsg.getMID() > 0) {
                        sendJuickMessage(jmsg);
                    }
                }
            }
        } else {
            sendOut(xmsg);
        }
    }

    @Override
    public void onPresence(Presence presence) {
        JID jid = presence.to;
        if (!jid.Host.equals(componentName)) {
            logger.info("STREAM ROUTER (PRESENCE): " + presence.toString());
            sendOut(presence);
        }
    }

    @Override
    public void onStreamReady() {
        logger.info("STREAM ROUTER (READY)");
    }

    @Override
    public void onStreamFail(Exception ex) {
        logger.log(Level.SEVERE, "STREAM ROUTER (FAIL)", ex);
    }

    public StreamComponent getRouter() {
        return router;
    }

    public void setRouter(StreamComponent router) {
        this.router = router;
    }

    public List<ConnectionIn> getInConnections() {
        return inConnections;
    }

    public List<ConnectionOut> getOutConnections() {
        return outConnections;
    }

    public List<CacheEntry> getOutCache() {
        return outCache;
    }

    public JdbcTemplate getSql() {
        return sql;
    }

    public void setSql(JdbcTemplate sql) {
        this.sql = sql;
    }
}