package com.juick.components.s2s;

import com.juick.User;
import com.juick.components.XMPPServer;
import com.juick.xmpp.JID;
import com.juick.xmpp.Message;
import com.juick.xmpp.Presence;
import com.juick.xmpp.Stanza;
import com.juick.xmpp.extensions.Error;
import com.juick.xmpp.extensions.JuickMessage;

import javax.inject.Inject;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 * @author ugnich
 */
public class JuickBot implements StanzaListener {

    XMPPServer xmpp;

    @Inject
    public JuickBot(XMPPServer xmpp) {
        this.xmpp = xmpp;
        xmpp.addStanzaListener(this);
    }

    private static final String HELPTEXT =
            "@username text - Send private message\n"
            + "*tagname Blah-blah-blah - Post a message with tag 'tagname'\n"
            + "#1234 Blah-blah-blah - Answer to message #1234\n"
            + "#1234/5 Blah - Answer to reply #1234/5\n"
            + "! #1234 - Recommend post\n"
            + "\n"
            + "# - Show last messages from your feed (## - second page, ...)\n"
            + "@ - Show recomendations and popular personal blogs\n"
            + "* - Show your tags\n"
            + "#1234 - Show message\n"
            + "#1234+ - Show message with replies\n"
            + "@username - Show user's info\n"
            + "@username+ - Show user's info and last 10 messages\n"
            + "@username *tag - User's messages with this tag\n"
            + "*tag - Show last 10 messages with this tag\n"
            + "? blah - Search posts for 'blah'\n"
            + "? @username blah - Searching among user\'s posts for 'blah'\n"
            + "D #123 - Delete message\n"
            + "D #123/45 - Delete reply\n"
            + "DL - Delete last message/reply\n"
            + "S - Show your subscriptions\n"
            + "S #123 - Subscribe to message replies\n"
            + "S @username - Subscribe to user's blog\n"
            + "U #123 - Unsubscribe from comments\n"
            + "U @username - Unsubscribe from user's blog\n"
            + "BL - Show your blacklist\n"
            + "BL @username - Add/delete user to/from your blacklist\n"
            + "BL *tag - Add/delete tag to/from your blacklist\n"
            + "ON / OFF - Enable/disable subscriptions delivery\n"
            + "PING - Pong\n"
            + "\n"
            + "Read more: http://juick.com/help/";

    public boolean incomingPresence(Presence p) {
        final String username = p.to.Username.toLowerCase();
        final boolean toJuick = username.equals("juick");

        if (p.type == null) {
            Presence reply = new Presence();
            reply.from = new JID(p.to.Username, p.to.Host, null);
            reply.to = new JID(p.from.Username, p.from.Host, null);
            reply.type = Presence.Type.unsubscribe;
            xmpp.sendOut(reply);
            return true;
        } else if (p.type.equals(Presence.Type.probe)) {
            int uid_to = 0;
            if (!toJuick) {
                uid_to = xmpp.userService.getUIDbyName(username);
            }

            if (toJuick || uid_to > 0) {
                Presence reply = new Presence();
                reply.from = p.to;
                reply.from.Resource = "Juick";
                reply.to = p.from;
                reply.priority = 10;
                xmpp.sendOut(reply);
            } else {
                Presence reply = new Presence(p.to, p.from, Presence.Type.error);
                reply.id = p.id;
                reply.addChild(new Error(Error.Type.cancel, "item-not-found"));
                xmpp.sendOut(reply);
                return true;
            }
            return true;
        } else if (p.type.equals(Presence.Type.subscribe)) {
            boolean canSubscribe = false;
            if (toJuick) {
                canSubscribe = true;
            } else {
                int uid_to = xmpp.userService.getUIDbyName(username);
                if (uid_to > 0) {
                    xmpp.pmQueriesService.addPMinRoster(uid_to, p.from.Bare());
                    canSubscribe = true;
                }
            }

            if (canSubscribe) {
                Presence reply = new Presence(p.to, p.from, Presence.Type.subscribed);
                xmpp.sendOut(reply);

                reply.from.Resource = "Juick";
                reply.priority = 10;
                reply.type = null;
                xmpp.sendOut(reply);

                return true;
            } else {
                Presence reply = new Presence(p.to, p.from, Presence.Type.error);
                reply.id = p.id;
                reply.addChild(new Error(Error.Type.cancel, "item-not-found"));
                xmpp.sendOut(reply);
                return true;
            }
        } else if (p.type.equals(Presence.Type.unsubscribe)) {
            if (!toJuick) {
                int uid_to = xmpp.userService.getUIDbyName(username);
                if (uid_to > 0) {
                    xmpp.pmQueriesService.removePMinRoster(uid_to, p.from.Bare());
                }
            }

            Presence reply = new Presence(p.to, p.from, Presence.Type.unsubscribed);
            xmpp.sendOut(reply);
        }

        return false;
    }

    public boolean incomingMessage(Message msg) {
        if (msg.body == null || msg.body.isEmpty()) {
            return false;
        }

        String username = msg.to.Username.toLowerCase();

        User user_from = null;
        String signuphash = "";
        user_from = xmpp.userService.getUserByJID(msg.from.Bare());
        if (user_from == null) {
            signuphash = xmpp.userService.getSignUpHashByJID(msg.from.Bare());
        }

        if (user_from == null) {
            Message reply = new Message(msg.to, msg.from, Message.Type.chat);
            if (username.equals("juick")) {
                reply.body = "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.";
            } else {
                reply.body = "Внимание, системное сообщение!\nВаш JabberID не обнаружен в списке доверенных. Для того, чтобы отправить сообщение пользователю " + username + "@juick.com, пожалуйста зарегистрируйте свой JabberID в системе: 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\nWarning, system message!\nYour JabberID is not found in our server's white list. To send a message to " + username + "@juick.com, 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.";
            }
            xmpp.sendOut(reply);
            return true;
        }

        if (username.equals("juick")) {
            return incomingMessageJuick(user_from, msg);
        }

        int uid_to = xmpp.userService.getUIDbyName(username);

        if (uid_to == 0) {
            Message reply = new Message(msg.to, msg.from, Message.Type.error);
            reply.id = msg.id;
            reply.addChild(new Error(Error.Type.cancel, "item-not-found"));
            xmpp.sendOut(reply);
            return true;
        }

        boolean success = false;
        if (!xmpp.userService.isInBLAny(uid_to, user_from.getUid())) {
            success = xmpp.pmQueriesService.createPM(user_from.getUid(), uid_to, msg.body);
        }

        if (success) {
            Message m = new Message();
            m.from = new JID("juick", "juick.com", null);
            m.to = new JID(Integer.toString(uid_to), "push.juick.com", null);
            JuickMessage jmsg = new JuickMessage();
            jmsg.setUser(user_from);
            jmsg.setText(msg.body);
            m.childs.add(jmsg);
            xmpp.getRouter().sendStanza(m.toString());

            m.to.Host = "ws.juick.com";
            xmpp.getRouter().sendStanza(m.toString());

            List<String> jids;
            boolean inroster = false;
            jids = xmpp.userService.getJIDsbyUID(uid_to);
            for (String jid : jids) {
                Message mm = new Message();
                mm.to = new JID(jid);
                mm.type = Message.Type.chat;
                inroster = xmpp.pmQueriesService.havePMinRoster(user_from.getUid(), jid);
                if (inroster) {
                    mm.from = new JID(jmsg.getUser().getName(), "juick.com", "Juick");
                    mm.body = msg.body;
                } else {
                    mm.from = new JID("juick", "juick.com", "Juick");
                    mm.body = "Private message from @" + jmsg.getUser().getName() + ":\n" + msg.body;
                }
                xmpp.sendOut(mm);
            }
        } else {
            Message reply = new Message(msg.to, msg.from, Message.Type.error);
            reply.id = msg.id;
            reply.addChild(new Error(Error.Type.cancel, "not-allowed"));
            xmpp.sendOut(reply);
        }

        return false;
    }
    private static Pattern regexPM = Pattern.compile("^\\@(\\S+)\\s+([\\s\\S]+)$");

    public boolean incomingMessageJuick(User user_from, Message msg) {
        String command = msg.body.trim();
        int commandlen = command.length();

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

        if (commandlen == 4) {
            if (command.equalsIgnoreCase("PING")) {
                commandPing(msg);
                return true;
            } else if (command.equalsIgnoreCase("HELP")) {
                commandHelp(msg);
                return true;
            }
        } else if (commandlen == 5 && command.equalsIgnoreCase("LOGIN")) {
            commandLogin(msg, user_from);
            return true;
        } else if (command.charAt(0) == '@') {
            Matcher matchPM = regexPM.matcher(command);
            if (matchPM.find()) {
                String user_to = matchPM.group(1);
                String msgtxt = matchPM.group(2);
                commandPM(msg, user_from, user_to, msgtxt);
                return true;
            }
        } else if (commandlen == 2 && command.equalsIgnoreCase("BL")) {
            commandBLShow(msg, user_from);
            return true;
        }

        return false;
    }

    private void commandPing(Message m) {
        Presence p = new Presence(xmpp.getJid(), m.from);
        p.priority = 10;
        xmpp.sendOut(p);

        Message reply = new Message(xmpp.getJid(), m.from, Message.Type.chat);
        reply.body = "PONG";
        xmpp.sendOut(reply);
    }

    private void commandHelp(Message m) {
        Message reply = new Message(xmpp.getJid(), m.from, Message.Type.chat);
        reply.body = HELPTEXT;
        xmpp.sendOut(reply);
    }

    private void commandLogin(Message m, User user_from) {
        Message reply = new Message(xmpp.getJid(), m.from, Message.Type.chat);
        reply.body = "http://juick.com/login?" + xmpp.userService.getHashByUID(user_from.getUid());
        xmpp.sendOut(reply);
    }

    private void commandPM(Message m, User user_from, String user_to, String body) {
        int ret = 0;

        int uid_to = 0;
        List<String> jids_to = null;
        boolean haveInRoster = false;

        if (user_to.indexOf('@') > 0) {
            uid_to = xmpp.userService.getUIDbyJID(user_to);
        } else {
            uid_to = xmpp.userService.getUIDbyName(user_to);
        }

        if (uid_to > 0) {
            if (!xmpp.userService.isInBLAny(uid_to, user_from.getUid())) {
                if (xmpp.pmQueriesService.createPM(user_from.getUid(), uid_to, body)) {
                    jids_to = xmpp.userService.getJIDsbyUID(uid_to);
                    ret = 200;
                } else {
                    ret = 500;
                }
            } else {
                ret = 403;
            }
        } else {
            ret = 404;
        }

        if (ret == 200) {
            Message msg = new Message();
            msg.from = new JID("juick", "juick.com", null);
            msg.to = new JID(Integer.toString(uid_to), "push.juick.com", null);
            JuickMessage jmsg = new JuickMessage();
            jmsg.setUser(user_from);
            jmsg.setText(body);
            msg.childs.add(jmsg);
            xmpp.getRouter().sendStanza(msg.toString());

            msg.to.Host = "ws.juick.com";
            xmpp.getRouter().sendStanza(msg.toString());

            for (String jid : jids_to) {
                Message mm = new Message();
                mm.to = new JID(jid);
                mm.type = Message.Type.chat;
                haveInRoster = xmpp.pmQueriesService.havePMinRoster(user_from.getUid(), jid);
                if (haveInRoster) {
                    mm.from = new JID(user_from.getName(), "juick.com", "Juick");
                    mm.body = body;
                } else {
                    mm.from = new JID("juick", "juick.com", "Juick");
                    mm.body = "Private message from @" + user_from.getName() + ":\n" + body;
                }
                xmpp.sendOut(mm);
            }
        }

        Message reply = new Message(m.to, m.from);
        if (ret == 200) {
            reply.type = m.type;
            reply.body = "Private message sent";
        } else {
            reply.type = Message.Type.error;
            reply.body = "Error " + ret;
        }
        xmpp.sendOut(reply);
    }

    private void commandBLShow(Message m, User user_from) {
        List<User> blusers = xmpp.userService.getUserBLUsers(user_from.getUid());
        List<String> bltags = xmpp.tagService.getUserBLTags(user_from.getUid());

        String txt = "";
        if (bltags.size() > 0) {
            for (String bltag : bltags) {
                txt += "*" + bltag + "\n";
            }

            if (blusers.size() > 0) {
                txt += "\n";
            }
        }
        if (blusers.size() > 0) {
            for (User bluser : blusers) {
                txt += "@" + bluser.getName() + "\n";
            }
        }
        if (txt.isEmpty()) {
            txt = "You don't have any users or tags in your blacklist.";
        }

        Message reply = new Message(xmpp.getJid(), m.from, Message.Type.chat);
        reply.body = txt;
        xmpp.sendOut(reply);
    }

    @Override
    public void stanzaReceived(String name, Stanza xmlValue) {
        if (xmlValue instanceof Presence) {
            Presence p = (Presence) xmlValue;
            if (p.type == null || !p.type.equals(Presence.Type.error)) {
                incomingPresence(p);
            }
        } else if (xmlValue instanceof Message) {
            Message msg = (Message) xmlValue;
            if (!incomingMessage(msg)) {
                xmpp.getRouter().sendStanza(msg.toString());
            }
        }
    }
}