/*
 * 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.service;

import com.juick.*;
import com.juick.model.AnonymousUser;
import com.juick.model.PrivacyOpts;
import com.juick.model.ResponseReply;
import com.juick.server.util.HttpNotFoundException;
import com.juick.util.MessageUtils;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import javax.inject.Inject;
import java.net.URI;
import java.sql.*;
import java.time.Instant;
import java.util.*;
import java.util.Date;
import java.util.stream.Collectors;

/**
 * Created by aalexeev on 11/13/16.
 */
@Repository
public class MessagesServiceImpl extends BaseJdbcService implements MessagesService {
    private static final Logger logger = LoggerFactory.getLogger(MessagesServiceImpl.class);
    @Inject
    private UserService userService;
    @Inject
    private TagService tagService;
    @Inject
    private SearchService searchService;
    @Inject
    private ImagesService imagesService;
    @Value("${img_url:https://i.juick.com/}")
    private String baseImagesUrl;

    private class MessageMapper implements RowMapper<Message> {
        @Override
        public Message mapRow(ResultSet rs, int rowNum) throws SQLException {
            Message msg = new Message();
            msg.setMid(rs.getInt(1));
            msg.setRid(rs.getInt(2));
            msg.setReplyto(rs.getInt(3));
            User user = new User();
            user.setUid(rs.getInt(4));
            user.setName(Optional.ofNullable(rs.getString(5)).orElse(AnonymousUser.INSTANCE.getName()));
            user.setBanned(rs.getBoolean(6));
            user.setUri(URI.create(Optional.ofNullable(rs.getString(22)).orElse(StringUtils.EMPTY)));
            msg.setUser(user);
            msg.setTimestamp(rs.getTimestamp(7).toInstant());
            msg.ReadOnly = rs.getBoolean(8);
            msg.setPrivacy(rs.getInt(9));
            msg.FriendsOnly = msg.getPrivacy() < 0;
            msg.setReplies(rs.getInt(10));
            msg.setAttachmentType(rs.getString(11));
            msg.setLikes(rs.getInt(12));
            msg.Hidden = rs.getBoolean(13);
            String tagsStr = rs.getString(14);
            msg.setTags(MessageUtils.parseTags(tagsStr));
            msg.setRepliesBy(rs.getString(15));
            msg.setText(rs.getString(16));
            msg.setReplyQuote(MessageUtils.formatQuote(rs.getString(17)));
            msg.setUpdated(rs.getTimestamp(18).toInstant());
            int quoteUid = rs.getInt(19);
            if (quoteUid > 0) {
                User quoteUser = new User();
                quoteUser.setUid(quoteUid);
                quoteUser.setName(rs.getString(20));
                msg.setTo(quoteUser);
            }
            msg.setUpdatedAt(rs.getTimestamp(21).toInstant());
            if (StringUtils.isNotEmpty(msg.getAttachmentType())) {
                try {
                    imagesService.setAttachmentMetadata(baseImagesUrl, msg);
                } catch (Exception e) {
                    logger.warn("exception reading images for mid {} rid {}", msg.getMid(), msg.getRid(), e);
                }
            }
            return msg;
        }
    }



    /**
     * @see <a href="https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-type-conversions.html">Java, JDBC and MySQL Types</a>
     */
    @Transactional
    @Override
    public int createMessage(final int uid, final String txt, final String attachment, final Collection<com.juick.Tag> tags) {
        SimpleJdbcInsert simpleJdbcInsert = new SimpleJdbcInsert(getJdbcTemplate()).withTableName("messages")
                .usingColumns("user_id", "attach", "ts")
                .usingGeneratedKeyColumns("message_id");
        Map<String, Object> insertMap = new HashMap<>();
        insertMap.put("user_id", uid);
        Instant now = Instant.now();
        insertMap.put("ts", Timestamp.from(now));
        if (StringUtils.isNotEmpty(attachment)) {
            insertMap.put("attach", attachment);
        }
        int mid = simpleJdbcInsert.executeAndReturnKey(insertMap).intValue();
        if (mid > 0) {
            String tagsNames = StringUtils.EMPTY;

            if (CollectionUtils.isNotEmpty(tags)) {
                StringBuilder tasNamesBuilder = new StringBuilder();
                List<Object[]> params = new ArrayList<>(tags.size());

                boolean next = false;

                for (Tag tag : tags) {
                    if (next) {
                        tasNamesBuilder.append(" ");
                    } else
                        next = true;

                    tasNamesBuilder.append(tag.getName());
                    params.add(new Object[]{mid, tag.TID});
                }
                tagsNames = tasNamesBuilder.toString();

                getJdbcTemplate().batchUpdate(
                        "INSERT INTO messages_tags(message_id, tag_id) VALUES (?, ?)",
                        params, new int[]{Types.INTEGER, Types.INTEGER});
            }

            getJdbcTemplate().update(
                    "INSERT INTO messages_txt(message_id, tags, txt, updated_at) VALUES (?, ?, ?, ?)",
                    new Object[]{mid, tagsNames, txt, Timestamp.from(now)},
                    new int[]{Types.INTEGER, Types.VARCHAR, Types.VARCHAR, Types.TIMESTAMP});
            getJdbcTemplate().update("UPDATE users SET lastmessage=? where id=?", Timestamp.from(now), uid);
        }

        return mid;
    }

    /**
     * @param mid
     * @param rid
     * @param user
     * @param txt
     * @param attachment
     * @return
     * @see <a href="https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-type-conversions.html">Java, JDBC and MySQL Types</a>
     */
    @Transactional
    @Override
    public int createReply(final int mid, final int rid, final User user, final String txt, final String attachment) {
        int ridnew = getReplyIDIncrement(mid);
        Date ts = Date.from(Instant.now());
        getJdbcTemplate().update("INSERT INTO replies(message_id, reply_id, user_id, replyto, attach, txt, ts, updated_at, user_uri) " +
                        "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
                mid, ridnew, user.getUid(), rid, attachment, txt, ts, ts, user.getUri().toASCIIString());

        if (ridnew > 0) {
            getJdbcTemplate().update(
                    "UPDATE messages SET replies = replies + 1, updated=? WHERE message_id = ?",
                    ts, mid);
            setLastReadComment(user, mid, ridnew);
            getJdbcTemplate().update("UPDATE users SET lastmessage=? where id=?", ts, user.getUid());
        }
        return ridnew;
    }

    @Override
    public int getReplyIDIncrement(final int mid) {
        return getJdbcTemplate().execute((ConnectionCallback<Integer>) conn -> {
            conn.setAutoCommit(false);
            final int replyNo;
            try (PreparedStatement ps = conn.prepareStatement("SELECT maxreplyid+1 FROM messages WHERE message_id=? FOR UPDATE")) {
                ps.setInt(1, mid);
                try (ResultSet resultSet = ps.executeQuery()) {
                    if (resultSet.next()) {
                        replyNo = resultSet.getInt(1);
                    } else {
                        throw new IncorrectResultSizeDataAccessException("while getting getReplyIDIncrement, mid=" + mid, 1, 0);
                    }
                }
            }
            try (PreparedStatement ps = conn.prepareStatement("UPDATE messages SET maxreplyid=? WHERE message_id=?")) {
                ps.setInt(1, replyNo);
                ps.setInt(2, mid);
                if (ps.executeUpdate() != 1) {
                    throw new IncorrectResultSizeDataAccessException("Cannot find a message to update: " + mid, 1, 0);
                }
            }
            conn.commit();
            return replyNo;
        });

    }

    @Transactional
    void updateRepliesBy(int mid) {
        List<String> users = getJdbcTemplate().queryForList("SELECT users.nick FROM replies " +
                "INNER JOIN users ON replies.user_id=users.id WHERE replies.message_id=? " +
                "GROUP BY replies.user_id ORDER BY COUNT(replies.reply_id) DESC LIMIT 5", String.class, mid);
        String result = users.stream().map(u -> "@" + u).collect(Collectors.joining(","));
        getJdbcTemplate().update("UPDATE messages_txt SET repliesby=? WHERE message_id=?", result, mid);
    }

    @Transactional
    @Override
    public RecommendStatus recommendMessage(final int mid, final int vuid) {
        int wasDeleted = getJdbcTemplate()
                .update("DELETE FROM favorites WHERE user_id=? AND message_id=? and like_id=?", vuid, mid, Reaction.LIKE);
        if (wasDeleted > 0) {
            return RecommendStatus.Deleted;
        } else {
            boolean wasAdded = getJdbcTemplate()
                    .update("INSERT INTO favorites(user_id, message_id, ts, like_id ) VALUES (?, ?, NOW(), ?)", vuid, mid,Reaction.LIKE) == 1;
            if (wasAdded) {
                return RecommendStatus.Added;
            }
        }
        return RecommendStatus.Error;
    }

    @Override
    public List<Reaction> listReactions() {
        return jdbcTemplate.query("SELECT like_id, description FROM reactions", (rs, rowNum) -> {
            Reaction reaction = new Reaction(rs.getInt("like_id"));
            reaction.setDescription(rs.getString("description"));
            return reaction;
        });
    }

    @Transactional
    @Override
    public RecommendStatus likeMessage(int mid, int vuid, int reactionId) throws IllegalArgumentException {
        boolean wasAdded = getJdbcTemplate()
                .update("INSERT INTO favorites(user_id, message_id, ts, like_id ) VALUES (?, ?, NOW(), ?)", vuid, mid, reactionId) == 1;
        if (wasAdded) {
            return RecommendStatus.Added;
        }

        return RecommendStatus.Error;
    }

    @Transactional(readOnly = true)
    @Override
    public boolean canViewThread(final int mid, final int uid) {
        List<PrivacyOpts> list = getJdbcTemplate().query(
                "SELECT user_id, privacy FROM messages WHERE message_id = ?",
                (rs, rowNum) -> {
                    PrivacyOpts res = new PrivacyOpts();

                    res.setUid(rs.getInt(1));
                    res.setPrivacy(rs.getInt(2));

                    return res;
                },
                mid);

        PrivacyOpts privacyOpts = list.isEmpty() ? null : list.get(0);

        return privacyOpts == null ||
                privacyOpts.getPrivacy() >= 0 ||
                uid == privacyOpts.getUid() ||
                ((privacyOpts.getPrivacy() == -1 || privacyOpts.getPrivacy() == -2) &&
                        uid > 0 && userService.isInWL(privacyOpts.getUid(), uid));
    }

    @Transactional(readOnly = true)
    @Override
    public boolean isReadOnly(final int mid) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT readonly FROM messages WHERE message_id = ?",
                new Object[]{mid},
                Integer.class);

        return !list.isEmpty() && list.get(0) == 1;
    }

    @Transactional(readOnly = true)
    @Override
    public boolean isSubscribed(final int uid, final int mid) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT 1 FROM subscr_messages WHERE suser_id = ? AND message_id = ?",
                new Object[]{uid, mid},
                Integer.class);

        return !list.isEmpty() && list.get(0) == 1;
    }

    @Transactional(readOnly = true)
    @Override
    public int getMessagePrivacy(final int mid) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT privacy FROM messages WHERE message_id = ?",
                new Object[]{mid},
                Integer.class);

        return list.isEmpty() ? -4 : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public com.juick.Message getMessage(final int mid) {

        List<com.juick.Message> list = getJdbcTemplate().query(
                "SELECT messages.message_id as mid, 0 as rid, 0 as replyto, "
                        + "messages.user_id as uid, users.nick, users.banned as banned, "
                        + ""
                        + "messages.ts,"
                        + "messages.readonly, messages.privacy, messages.replies,"
                        + "messages.attach, COUNT(DISTINCT favorites.user_id) as likes, messages.hidden,"
                        + "txt.tags, txt.repliesby, txt.txt, '' as q, messages.updated as updated, 0 as to_uid, "
                        + "NULL as to_name, txt.updated_at, '' as uri FROM messages "
                        + "INNER JOIN users ON messages.user_id = users.id "
                        + "INNER JOIN messages_txt AS txt "
                        + "ON messages.message_id = txt.message_id "
                        + "LEFT JOIN favorites "
                        + "ON messages.message_id = favorites.message_id AND favorites.like_id=1 "
                        + "WHERE messages.message_id = ? "
                        + "GROUP BY mid, rid, replyto, uid, nick, banned, messages.ts, readonly, "
                        + "privacy, replies, attach, tags, repliesby, q, updated_at, uri",
                new MessageMapper(),
                mid);
        if (!list.isEmpty()) {
            final Message message = list.get(0);
            Map<Integer, Set<Reaction>> reactionStats = updateReactionsFor(Collections.singletonList(mid));
            message.setReactions(reactionStats.get(message.getMid()));
            return message;
        }
        return null;
    }

    @Transactional(readOnly = true)
    @Override
    public com.juick.Message getReply(final int mid, final int rid) {
        List<com.juick.Message> list = getJdbcTemplate().query(
                "SELECT replies.user_id, users.nick,"
                        + "replies.replyto, replies.ts,"
                        + "replies.attach, replies.txt, IFNULL(q.txt,t.txt) as quote, "
                        + "COALESCE(q.user_id, m.user_id) AS to_uid, COALESCE(qu.nick, mu.nick) AS to_name, "
                        + "replies.updated_at, replies.user_uri as uri "
                        + "FROM replies INNER JOIN users ON replies.user_id = users.id "
                        + "LEFT JOIN replies q ON replies.message_id = q.message_id and replies.replyto = q.reply_id "
                        + "LEFT JOIN messages_txt t ON replies.message_id = t.message_id "
                        + "LEFT JOIN messages m ON replies.message_id = m.message_id "
                        + "LEFT JOIN users qu ON q.user_id=qu.id "
                        + "LEFT JOIN users mu ON m.user_id=mu.id "
                        + "WHERE replies.message_id = ? AND replies.reply_id = ?",
                (rs, num) -> {
                    Message msg = new Message();

                    msg.setMid(mid);
                    msg.setRid(rid);
                    msg.setUser(new User());
                    msg.getUser().setUid(rs.getInt(1));
                    msg.getUser().setName(rs.getString(2));
                    msg.setReplyto(rs.getInt(3));
                    msg.setTimestamp(rs.getTimestamp(4).toInstant());
                    msg.setAttachmentType(rs.getString(5));
                    msg.setText(rs.getString(6));
                    String quote = rs.getString(7);

                    if (!StringUtils.isEmpty(quote)) {
                        msg.setReplyQuote(MessageUtils.formatQuote(quote));
                    }
                    int quoteUid = rs.getInt(8);
                    if (quoteUid > 0) {
                        User quoteUser = new User();
                        quoteUser.setUid(quoteUid);
                        quoteUser.setName(rs.getString(9));
                        msg.setTo(quoteUser);
                    }
                    msg.setUpdatedAt(rs.getTimestamp(10).toInstant());
                    if (StringUtils.isNotEmpty(msg.getAttachmentType())) {
                        try {
                            imagesService.setAttachmentMetadata(baseImagesUrl, msg);
                        } catch (Exception e) {
                            logger.warn("exception reading images for mid {} rid {}", msg.getMid(), msg.getRid(), e);
                        }
                    }
                    return msg;
                },
                mid, rid);

        return list.isEmpty() ? null : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public User getMessageAuthor(final int mid) {
        List<User> list = getJdbcTemplate().query(
                "SELECT messages.user_id, users.nick "
                        + "FROM messages INNER JOIN users ON messages.user_id = users.id WHERE messages.message_id = ?",
                new Object[]{mid},
                (rs, num) -> {
                    User res = new com.juick.User();
                    res.setUid(rs.getInt(1));
                    res.setName(rs.getString(2));
                    return res;
                });

        return list.isEmpty() ?
                null : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getMessageRecommendations(final int mid) {
        return getJdbcTemplate().queryForList(
                "SELECT DISTINCT users.nick FROM favorites " +
                        "INNER JOIN users ON (favorites.message_id = ? AND favorites.user_id = users.id) " +
                        "INNER JOIN messages m ON favorites.message_id=m.message_id WHERE favorites.like_id=1 " +
                        "AND NOT EXISTS (SELECT 1 FROM bl_users WHERE " +
                        "(user_id = favorites.user_id AND bl_user_id = m.user_id) " +
                        "OR (user_id = m.user_id AND bl_user_id = favorites.user_id))",
                String.class, mid);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getAll(final int visitorUid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("before", before)
                .addValue("visitorUid", visitorUid);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT m.message_id FROM messages m WHERE " +
                        (before > 0 ?
                                " m.message_id < :before AND " : StringUtils.EMPTY) +
                        " m.hidden = 0 AND (m.privacy > 0" +
                        (visitorUid > 1 ?
                                " OR m.user_id = :visitorUid) AND NOT EXISTS (" +
                                        " SELECT 1 FROM bl_users b WHERE b.user_id = :visitorUid AND b.bl_user_id = m.user_id)" :
                                ")") +
                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
                        "(SELECT tag_id FROM messages_tags WHERE message_id = m.message_id) and :visitorUid = bt.user_id)" +
                        " AND NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1 and u.id = m.user_id and u.id <> :visitorUid) ORDER BY m.message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getTag(final int tid, final int visitorUid, final int before, final int cnt) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("tid", tid)
                .addValue("cnt", cnt)
                .addValue("before", before)
                .addValue("visitorUid", visitorUid);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT messages.message_id FROM (tags INNER JOIN messages_tags " +
                        "ON ((tags.synonym_id = :tid OR tags.tag_id = :tid) AND tags.tag_id = messages_tags.tag_id)) " +
                        "INNER JOIN messages ON messages.message_id = messages_tags.message_id WHERE " +
                        (before > 0 ?
                                " messages.message_id < :before AND " : StringUtils.EMPTY) +
                        "(messages.privacy > 0 OR messages.user_id = :visitorUid) " +
                        "AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :visitorUid and b.bl_user_id = messages.user_id) " +
                        "ORDER BY messages.message_id DESC LIMIT :cnt",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getTags(final String tids, final int visitorUid, final int before, final int cnt) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("cnt", cnt)
                .addValue("before", before)
                .addValue("visitorUid", visitorUid);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT messages.message_id FROM messages_tags " +
                        "INNER JOIN messages USING(message_id) WHERE messages_tags.tag_id IN (" + tids + ") " +
                        (before > 0 ?
                                " AND messages.message_id < :before " : StringUtils.EMPTY) +
                        " AND (messages.privacy > 0 OR messages.user_id = :visitorUid) " +
                        "ORDER BY messages.message_id DESC LIMIT :cnt",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getPlace(final int placeId, final int visitorUid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("placeId", placeId)
                .addValue("before", before)
                .addValue("visitorUid", visitorUid);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM messages WHERE place_id = :placeId " +
                        (before > 0 ?
                                " AND message_id < :before " : StringUtils.EMPTY) +
                        " AND (privacy > 0 OR user_id = :visitorUid) ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getMyFeed(final int uid, final int before, boolean recommended) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("before", before);

        List<Integer> mids = getNamedParameterJdbcTemplate().queryForList(
                "(SELECT message_id FROM messages " +
                        " INNER JOIN subscr_users ON (subscr_users.suser_id = :uid AND subscr_users.user_id = messages.user_id) " +
                        " WHERE " +
                        (before > 0 ?
                                " message_id < :before AND " : StringUtils.EMPTY) +
                        " (privacy >= 0 OR (privacy >= -2 AND privacy <= -1" +
                        " AND EXISTS (SELECT 1 FROM wl_users w WHERE w.wl_user_id = :uid and w.user_id = messages.user_id))) " +
                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
                        "(SELECT tag_id FROM messages_tags WHERE message_id = messages.message_id) and :uid = bt.user_id))" +
                        " UNION " +
                        " (SELECT message_id FROM messages WHERE user_id=:uid " +
                        (before > 0 ?
                                " AND message_id < :before " : StringUtils.EMPTY) +
                        (recommended ?
                        ") UNION " +
                        " (SELECT f.message_id as message_id FROM favorites f INNER JOIN messages ON " +
                                "f.message_id=messages.message_id WHERE " +
                        "EXISTS (SELECT 1 FROM subscr_users s WHERE s.suser_id = :uid and f.user_id = s.user_id)" +
                        (before > 0 ?
                                " AND f.message_id < :before " : StringUtils.EMPTY)  : StringUtils.EMPTY) +
                        " AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid and b.bl_user_id = messages.user_id)" +
                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
                        "(SELECT tag_id FROM messages_tags WHERE message_id = messages.message_id) and :uid = bt.user_id)) " +
                        "ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);

        return mids;
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getPrivate(final int uid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList
                ("SELECT message_id FROM messages WHERE user_id = :uid AND privacy < 0" +
                                (before > 0 ?
                                        " AND message_id < :before " : StringUtils.EMPTY) +
                                "ORDER BY message_id DESC LIMIT 20",
                        sqlParameterSource,
                        Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getDiscussions(final int uid, final Long to) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("to", new Timestamp(to));

        if (uid == 0) {
            return getNamedParameterJdbcTemplate().query("SELECT message_id FROM messages WHERE " +
                    (to != 0 ?
                            " updated < :to AND" : StringUtils.EMPTY) +
                            " NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1" +
                            " AND u.id = messages.user_id and u.id <> :uid) " +
                    " ORDER BY updated DESC, message_id DESC LIMIT 20",
                    sqlParameterSource,
                    (rs, rowNum) -> rs.getInt(1));
        }
        return getNamedParameterJdbcTemplate().query(
                "SELECT messages.message_id, messages.updated FROM subscr_messages " +
                        "INNER JOIN messages ON messages.message_id=subscr_messages.message_id " +
                        "WHERE suser_id = :uid " +
                        (to != 0 ?
                                "AND updated < :to " : StringUtils.EMPTY) +
                        " AND NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1" +
                        " AND u.id = messages.user_id and u.id <> :uid) " +
                        "ORDER BY updated DESC, message_id DESC LIMIT 20",
                sqlParameterSource,
                (rs, rowNum) -> rs.getInt(1));
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getRecommended(final int uid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT f.message_id FROM favorites f WHERE " +
                        "EXISTS (SELECT 1 FROM subscr_users s WHERE s.suser_id = :uid and f.user_id = s.user_id)" +
                        (before > 0 ?
                                " AND f.message_id < :before " : StringUtils.EMPTY) +
                        "ORDER BY f.message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getPopular(final int visitorUid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("vid", visitorUid)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT m.message_id FROM messages m WHERE m.privacy > 0 " +
                        (before > 0 ?
                                " AND m.message_id < :before " : StringUtils.EMPTY) +
                        " AND m.popular > 0 AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :vid and b.bl_user_id = m.user_id) " +
                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
                        "(SELECT tag_id FROM messages_tags WHERE message_id = m.message_id) and :vid = bt.user_id)" +
                        " ORDER BY m.message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getPhotos(final int visitorUid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("vid", visitorUid)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT m.message_id FROM messages m WHERE (m.privacy > 0 OR m.user_id = :vid) " +
                        (before > 0 ?
                                " AND m.message_id < :before " : StringUtils.EMPTY) +
                        " AND m.attach IS NOT NULL " +
                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
                        "(SELECT tag_id FROM messages_tags WHERE message_id = m.message_id) and :vid = bt.user_id)" +
                        " AND NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1 and u.id = m.user_id and u.id <> :vid) " +
                        " AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :vid and b.bl_user_id = m.user_id) " +
                        " ORDER BY m.message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getSearch(final User visitor, final String search, final int page) {
        return searchService.searchInAllMessages(visitor, search, page);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserBlog(final int uid, final int privacy, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("privacy", privacy)
                .addValue("before", before);

        ;
        if (userService.getUserByUID(uid).orElseThrow(IllegalStateException::new).isBanned()) {
            throw new HttpNotFoundException();
        }

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM messages WHERE user_id = :uid" +
                        (before > 0 ?
                                " AND message_id < :before" : StringUtils.EMPTY) +
                        " AND privacy >= :privacy ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserTag(final int uid, final int tid, final int privacy, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("tid", tid)
                .addValue("privacy", privacy)
                .addValue("before", before);

        if (userService.getUserByUID(uid).orElseThrow(IllegalStateException::new).isBanned()) {
            throw new HttpNotFoundException();
        }

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT messages.message_id FROM messages_tags INNER JOIN messages " +
                        " USING (message_id) WHERE messages.user_id = :uid AND messages_tags.tag_id = :tid " +
                        (before > 0 ?
                                " AND messages.message_id < :before " : StringUtils.EMPTY) +
                        " AND messages.privacy >= :privacy ORDER BY messages.message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserBlogAtDay(final int uid, final int privacy, final int daysback) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("privacy", privacy)
                .addValue("daysback", daysback);

        if (userService.getUserByUID(uid).orElseThrow(IllegalStateException::new).isBanned()) {
            throw new HttpNotFoundException();
        }

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM messages WHERE user_id = :uid" +
                        (daysback > 0 ?
                                " AND ts >= date(NOW() - INTERVAL :daysback day)" +
                                " AND ts < date(NOW() - INTERVAL :daysback day + INTERVAL 1 day)" : StringUtils.EMPTY) +
                        " AND privacy >= :privacy ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserBlogWithRecommendations(final int uid, final int privacy, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("privacy", privacy)
                .addValue("before", before);

        if (userService.getUserByUID(uid).orElseThrow(IllegalStateException::new).isBanned()) {
            throw new HttpNotFoundException();
        }

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM " +
                    "(SELECT message_id FROM favorites " +
                            " WHERE user_id = :uid " +
                            (before > 0 ?
                                    " AND message_id < :before " : StringUtils.EMPTY) +
                            " ORDER BY message_id DESC LIMIT 20) as r" +
                    " UNION ALL " +
                "SELECT message_id FROM " +
                    "(SELECT message_id FROM messages WHERE user_id = :uid" +
                            (before > 0 ?
                                    " AND message_id < :before" : StringUtils.EMPTY) +
                            " AND privacy >= :privacy ORDER BY message_id DESC LIMIT 20) as m " +
                "ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserRecommendations(final int uid, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM favorites " +
                        " WHERE user_id = :uid " +
                        (before > 0 ?
                                " AND message_id < :before " : StringUtils.EMPTY) +
                        " ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserPhotos(final int uid, final int privacy, final int before) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("uid", uid)
                .addValue("privacy", privacy)
                .addValue("before", before);

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT message_id FROM messages WHERE user_id = :uid " +
                        (before > 0 ?
                                " AND message_id < :before " : StringUtils.EMPTY) +
                        " AND privacy >= :privacy AND attach IS NOT NULL ORDER BY message_id DESC LIMIT 20",
                sqlParameterSource,
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserSearch(final User visitor, final int UID, final String search, final int privacy, final int page) {
        return searchService.searchByStringAndUser(visitor, search, UID, page);
    }

    @Transactional(readOnly = true)
    @Override
    public List<com.juick.Message> getMessages(final User visitor, final List<Integer> mids) {
        if (CollectionUtils.isNotEmpty(mids)) {

            List<com.juick.Message> msgs = getNamedParameterJdbcTemplate().query(
                    "WITH RECURSIVE banned(message_id, reply_id) "
                            + "AS (SELECT message_id, reply_id FROM replies WHERE replies.message_id IN (:ids) "
                            + "AND (EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid AND b.bl_user_id = replies.user_id) "
                            + "OR EXISTS (SELECT 1 from users u WHERE u.banned = 1 and u.id = replies.user_id and u.id <> :uid)) "
                            + "UNION ALL SELECT replies.message_id, replies.reply_id FROM replies INNER JOIN banned "
                            + "ON banned.reply_id = replies.replyto AND banned.message_id=replies.message_id "
                            + "WHERE replies.message_id IN (:ids)) "
                            + "SELECT messages.message_id, 0 as rid, 0 as replyto, "
                            + "messages.user_id,users.nick, 0 as banned, "
                            + "messages.ts,"
                            + "messages.readonly,messages.privacy, messages.replies-COUNT(DISTINCT banned.reply_id) as replies,"
                            + "messages.attach,COUNT(DISTINCT favorites.user_id) AS likes,messages.hidden,"
                            + "messages_txt.tags,messages_txt.repliesby, messages_txt.txt, '' as q, "
                            + "messages.updated, 0 as to_uid, NULL as to_name, messages_txt.updated_at, '' as uri "
                            + "FROM (messages INNER JOIN messages_txt "
                            + "ON messages.message_id=messages_txt.message_id) "
                            + "INNER JOIN users ON messages.user_id=users.id "
                            + "LEFT JOIN favorites "
                            + "ON messages.message_id = favorites.message_id AND favorites.like_id=1 "
                            + "LEFT JOIN banned "
                            + "ON messages.message_id = banned.message_id "
                            + "WHERE messages.message_id IN (:ids) GROUP BY "
                            + "messages.message_id, rid, replyto, messages.user_id, users.nick, banned, messages.ts, messages.readonly, messages.privacy, messages.attach, messages.hidden, messages_txt.tags, messages_txt.repliesby, messages_txt.txt, q, messages.updated, to_uid, to_name, updated_at, uri",
                    new MapSqlParameterSource("ids", mids)
                    .addValue("uid", visitor.getUid()),
                    new MessageMapper());


            Map<Integer,Set<Reaction>>  likes =  updateReactionsFor(mids);

            msgs.forEach(i -> i.setReactions(likes.get(i.getMid())));

            msgs.sort(Comparator.comparing(item -> mids.indexOf(item.getMid())));

            return msgs;
        }
        return Collections.emptyList();
    }


    @Transactional(readOnly = true)
    @Override
    public Map<Integer,Set<Reaction>> updateReactionsFor(final List<Integer> mids) {

        return getNamedParameterJdbcTemplate().query("select f.message_id as mid, f.like_id as lid," +
                " r.description as descr, count(f.like_id) as cnt" +
                " from favorites f LEFT JOIN reactions r ON f.like_id = r.like_id " +
                " where f.message_id IN (:mids) " +
                " group by f.message_id, f.like_id",  new MapSqlParameterSource("mids", mids), (ResultSet rs) -> {
              Map<Integer,Set<Reaction>> results = new HashMap<>();


             while (rs.next()) {
                 int messageId = rs.getInt("mid");
                 int likeId    = rs.getInt("lid");
                 int count     = rs.getInt("cnt");
                 String description = rs.getString("descr");
                 Reaction reaction = new Reaction(likeId);
                 reaction.setCount(count);
                 reaction.setDescription(description);
                 results.computeIfAbsent(messageId, HashSet::new);
                 results.get(messageId).add(reaction);
            }

            return results;
        });

    }


    @Transactional
    @Override
    public List<Message> getReplies(final User user, final int mid) {
        List<Message> replies = getNamedParameterJdbcTemplate().query(
                "WITH RECURSIVE banned(reply_id, user_id) AS (" +
                        "SELECT reply_id, user_id FROM replies " +
                        "WHERE replies.message_id = :mid " +
                        "AND EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid AND b.bl_user_id = replies.user_id) " +
                        "UNION ALL SELECT replies.reply_id, replies.user_id FROM replies " +
                        "INNER JOIN banned ON banned.reply_id = replies.replyto " +
                        "WHERE replies.message_id = :mid) " +
                        "SELECT replies.message_id as mid, replies.reply_id, replies.replyto, " +
                        "replies.user_id, users.nick, users.banned, " +
                        "replies.ts, " +
                        "0 as readonly, 0 as privacy, 0 as replies, " +
                        "replies.attach, 0 as likes, 0 as hidden, " +
                        "NULL as tags, NULL as repliesby, replies.txt, " +
                        "IFNULL(qw.txt, t.txt) as q, " +
                        "NOW(), " +
                        "COALESCE(qw.user_id, m.user_id) as to_uid, COALESCE(qu.nick, mu.nick) as to_name, " +
                        "replies.updated_at, replies.user_uri as uri " +
                        "FROM replies LEFT JOIN users " +
                        "ON replies.user_id = users.id " +
                        "LEFT JOIN replies qw ON replies.message_id = qw.message_id and replies.replyto = qw.reply_id " +
                        "LEFT JOIN messages_txt t on replies.message_id = t.message_id " +
                        "LEFT JOIN messages m on replies.message_id = m.message_id " +
                        "LEFT JOIN users qu ON qw.user_id=qu.id " +
                        "LEFT JOIN users mu ON m.user_id=mu.id " +
                        "WHERE replies.message_id = :mid " +
                        "AND NOT EXISTS (SELECT 1 from users u WHERE u.banned = 1 and u.id = replies.user_id and u.id <> :uid)" +
                        "AND NOT EXISTS (SELECT 1 FROM banned WHERE banned.reply_id = replies.reply_id) " +
                        "AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid AND b.bl_user_id = m.user_id) " +
                        "ORDER BY replies.reply_id ASC",
                new MapSqlParameterSource("mid", mid).addValue("uid", user.getUid()),
                new MessageMapper());
        if (replies.size() > 0) {
            setRead(user, mid);
        }
        return replies;
    }

    @Transactional
    @Override
    public boolean setMessagePopular(final int mid, final int popular) {
        int ret;
        MapSqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("mid", mid)
                .addValue("popular", popular);

        switch (popular) {
            case -2:
                ret = getNamedParameterJdbcTemplate().update(
                        "UPDATE messages SET hidden = 1 WHERE message_id = :mid",
                        sqlParameterSource);
                break;
            case -1:
                sqlParameterSource.addValue("popular", 0);
            default:
                ret = getNamedParameterJdbcTemplate().update(
                        "UPDATE messages SET popular = :popular WHERE message_id = :mid",
                        sqlParameterSource);
                break;
        }

        if (popular == -1)
            ret = getNamedParameterJdbcTemplate().update(
                    "INSERT INTO top_ignore_messages VALUES (:mid)",
                    sqlParameterSource);

        return ret > 0;
    }

    @Transactional
    @Override
    public boolean setMessagePrivacy(final int mid) {
        return getJdbcTemplate().update("UPDATE messages SET privacy=1 WHERE message_id=?", mid) > 0;
    }

    @Transactional
    @Override
    public boolean deleteMessage(final int uid, final int mid) {
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("mid", mid)
                .addValue("uid", uid);

        if (getNamedParameterJdbcTemplate().update(
                "DELETE FROM messages WHERE message_id = :mid AND user_id = :uid", sqlParameterSource) > 0) {

            getNamedParameterJdbcTemplate().update("DELETE FROM messages_txt WHERE message_id = :mid", sqlParameterSource);
            getNamedParameterJdbcTemplate().update("DELETE FROM replies WHERE message_id = :mid", sqlParameterSource);
            getNamedParameterJdbcTemplate().update("DELETE FROM subscr_messages WHERE message_id = :mid", sqlParameterSource);
            getNamedParameterJdbcTemplate().update("DELETE FROM messages_tags WHERE message_id = :mid", sqlParameterSource);

            return true;
        }
        return false;
    }
    @Transactional
    @Override
    public boolean deleteReply(final int uid, final int mid, final int rid) {
        User author = getMessageAuthor(mid);
        SqlParameterSource sqlParameterSource = new MapSqlParameterSource()
                .addValue("mid", mid)
                .addValue("uid", uid)
                .addValue("rid", rid);
        boolean result;
        if (author.getUid() == uid) {
            result = getNamedParameterJdbcTemplate()
                    .update("DELETE FROM replies WHERE message_id=:mid AND reply_id=:rid", sqlParameterSource) > 0;
        } else {
            result = getNamedParameterJdbcTemplate()
                    .update("DELETE FROM replies WHERE message_id=:mid AND reply_id=:rid AND user_id=:uid"
                            , sqlParameterSource) > 0;
        }
        if (result) {
            getNamedParameterJdbcTemplate().update("UPDATE messages SET replies=replies-1 WHERE message_id=:mid", sqlParameterSource);
            updateRepliesBy(mid);
            return true;
        }
        return false;
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getLastMessages(int hours) {
        return getJdbcTemplate().queryForList("SELECT message_id FROM messages WHERE messages.ts>TIMESTAMPADD(HOUR,?,NOW())",
                Integer.class, -hours);

    }

    @Transactional(readOnly = true)
    @Override
    public List<ResponseReply> getLastReplies(int hours) {
        return getJdbcTemplate().query("SELECT users2.nick,replies.message_id,replies.reply_id," +
                "users.nick,replies.txt," +
                "replies.ts,replies.attach,replies.ts+0 " +
                "FROM ((replies INNER JOIN users ON replies.user_id=users.id) " +
                "INNER JOIN messages ON replies.message_id=messages.message_id) " +
                "INNER JOIN users AS users2 ON messages.user_id=users2.id " +
                "WHERE replies.ts>TIMESTAMPADD(HOUR,?,NOW()) AND messages.privacy>0", (rs, rowNum) -> {
            ResponseReply reply = new ResponseReply();
            reply.setMuname(rs.getString(1));
            reply.setMid(rs.getInt(2));
            reply.setRid(rs.getInt(3));
            reply.setUname(rs.getString(4));
            reply.setDescription(rs.getString(5));
            reply.setPubDate(rs.getTimestamp(6));
            reply.setAttachmentType(rs.getString(7));
            return reply;
        }, -hours);
    }
    @Transactional(readOnly = true)
    @Override
    public List<Integer> getPopularCandidates() {
        return getJdbcTemplate().queryForList("SELECT replies.message_id FROM replies " +
                "INNER JOIN messages ON replies.message_id = messages.message_id " +
                "LEFT JOIN messages_tags ON messages_tags.message_id = messages.message_id " +
                "WHERE COALESCE(messages_tags.tag_id, 0) != 2 " +
                "AND COALESCE(messages_tags.tag_id, 0) != 805 AND replies.ts > TIMESTAMPADD(HOUR, -2, CURRENT_TIMESTAMP) " +
                "AND messages.popular=0 GROUP BY messages.message_id having COUNT(DISTINCT(replies.user_id)) > 5 " +
                "UNION ALL SELECT favorites.message_id FROM favorites " +
                "INNER JOIN messages ON messages.message_id = favorites.message_id " +
                "LEFT JOIN messages_tags ON messages_tags.message_id = messages.message_id " +
                "WHERE COALESCE(messages_tags.tag_id, 0) != 2 AND favorites.ts > TIMESTAMPADD(HOUR, -2, CURRENT_TIMESTAMP) " +
                "AND messages.popular=0 GROUP BY messages.message_id HAVING COUNT(DISTINCT favorites.user_id) > 1;", Integer.class);
    }
    @Transactional
    @Override
    public void setLastReadComment(User user, Integer mid, Integer rid) {
        jdbcTemplate.update("UPDATE subscr_messages SET last_read_rid=GREATEST(?, last_read_rid) WHERE message_id=? AND suser_id=?",
                rid, mid, user.getUid());
    }
    @Transactional
    @Override
    public void setRead(User user, Integer mid) {
        jdbcTemplate.update("UPDATE subscr_messages SET last_read_rid=(select replies from messages " +
                        "where messages.message_id=subscr_messages.message_id) WHERE message_id=? AND suser_id=?",
                mid, user.getUid());
    }

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUnread(User user) {
        return jdbcTemplate.queryForList(
                "select subscr_messages.message_id " +
                        "from subscr_messages inner join messages on subscr_messages.message_id=messages.message_id " +
                        "where subscr_messages.suser_id=? and " +
                        "messages.replies>subscr_messages.last_read_rid",
                Integer.class, user.getUid());
    }

    @Transactional
    @Override
    public boolean updateMessage(Integer mid, Integer rid, String body) {
        Instant now = Instant.now();
        if (rid == 0) {
            return jdbcTemplate.update("UPDATE messages_txt SET txt=?, updated_at=? WHERE message_id=?", body, Timestamp.from(now), mid) > 0;
        } else {
            return jdbcTemplate.update("UPDATE replies SET txt=?, updated_at=? WHERE message_id=? and reply_id=?",
                    body, Timestamp.from(now), mid, rid) > 0;
        }
    }
}