/*
 * 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.User;
import com.juick.server.helpers.AnonymousUser;
import com.juick.server.helpers.Auth;
import com.juick.server.helpers.EmailOpts;
import com.juick.server.helpers.UserInfo;
import com.juick.server.util.HashUtils;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import javax.inject.Inject;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.*;

/**
 * Created by aalexeev on 11/13/16.
 */
@Repository
public class UserServiceImpl extends BaseJdbcService implements UserService {

    private class UserMapper implements RowMapper<User> {
        @Override
        public User mapRow(ResultSet rs, int rowNum) throws SQLException {
            User user = new User();

            user.setUid(rs.getInt(1));
            user.setName(rs.getString(2));
            user.setBanned(rs.getBoolean(3));
            user.setLang(rs.getString(4));

            return user;
        }
    }

    @Inject
    public UserServiceImpl(JdbcTemplate jdbcTemplate) {
        super(jdbcTemplate, null);
    }

    @Transactional
    @Override
    public String getSignUpHashByJID(final String jid) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT loginhash FROM jids WHERE jid = ? AND user_id IS NULL", String.class, jid);

        if (list.isEmpty()) {
            String hash = UUID.randomUUID().toString();
            getJdbcTemplate().update("INSERT INTO jids(jid, loginhash) VALUES (?, ?)", jid, hash);
            return hash;
        }
        return list.get(0);
    }

    @Transactional
    @Override
    public String getSignUpHashByTelegramID(final Long telegramId, final String username) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT loginhash FROM telegram WHERE tg_id = ? AND user_id IS NULL",
                String.class,
                telegramId);

        if (list.isEmpty()) {
            String hash = UUID.randomUUID().toString();
            getJdbcTemplate().update(
                    "INSERT INTO telegram(tg_id, loginhash, tg_name) VALUES (?, ?, ?)", telegramId, hash, username);
            return hash;
        }
        return list.get(0);
    }

    @Transactional
    @Override
    public int createUser(final String username, final String password) {
        KeyHolder holder = new GeneratedKeyHolder();
        try {
            getJdbcTemplate().update(
                    con -> {
                        PreparedStatement stmt = con.prepareStatement(
                                "INSERT INTO users(nick,passw) VALUES (?,?)",
                                Statement.RETURN_GENERATED_KEYS);
                        stmt.setString(1, username);
                        stmt.setString(2, password);
                        return stmt;
                    },
                    holder);
        } catch (DuplicateKeyException e) {
            return -1;
        }

        int uid = holder.getKey().intValue();

        getJdbcTemplate().update("INSERT INTO useroptions(user_id) VALUES (?)", uid);
        getJdbcTemplate().update("INSERT INTO subscr_users(user_id, suser_id) VALUES (2, ?)", uid);

        return uid;
    }

    @Transactional(readOnly = true)
    @Override
    public Optional<User> getUserByUID(final int uid) {
        List<User> list = getJdbcTemplate().query(
                "SELECT id, nick, banned, lang FROM users WHERE id = ?", new UserMapper(), uid);

        return list.isEmpty() ? Optional.empty() : Optional.of(list.get(0));
    }

    @Transactional(readOnly = true)
    @Override
    public User getUserByName(final String username) {
        if (StringUtils.isNotBlank(username)) {
            List<User> list = getJdbcTemplate().query(
                    "SELECT id, nick, banned, lang FROM users WHERE nick = ?", new UserMapper(), username);

            if (!list.isEmpty())
                return list.get(0);
        }
        // TODO: @NonNullable ?
        return AnonymousUser.INSTANCE;
    }

    @Override
    // No need marks with @Transactional annotation
    public User getFullyUserByName(final String username) {
        if (StringUtils.isNotBlank(username)) {
            List<User> list = getFullyUsersByNames(Collections.singletonList(username));
            if (!list.isEmpty())
                return list.get(0);
        }
        return null;
    }

    @Override
    @Transactional(readOnly = true)
    public User getUserByEmail(String email) {
        if (StringUtils.isNotBlank(email)) {
            List<User> list = getJdbcTemplate().query(
                    "SELECT id, nick, banned, lang FROM users WHERE id = (SELECT user_id FROM emails WHERE email = ?)",
                    new UserMapper(),
                    email);

            if (!list.isEmpty())
                return list.get(0);
        }
        return AnonymousUser.INSTANCE;
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getFullyUsersByNames(final Collection<String> usernames) {
        if (CollectionUtils.isEmpty(usernames))
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().query(
                "SELECT id, nick, passw, lang, banned FROM users WHERE nick in (:names)",
                new MapSqlParameterSource("names", usernames),
                (rs, rowNum) -> {
                    User user = new User();

                    user.setUid(rs.getInt(1));
                    user.setName(rs.getString(2));
                    user.setCredentials(rs.getString(3));
                    user.setLang(rs.getString(4));
                    user.setBanned(rs.getBoolean(5));

                    return user;
                });
    }

    @Transactional(readOnly = true)
    @Override
    public User getUserByJID(final String jid) {
        User result = null;

        if (StringUtils.isNotBlank(jid)) {
            List<User> list = getJdbcTemplate().query(
                    "SELECT id, nick, banned, lang FROM users WHERE id = (SELECT user_id FROM jids WHERE jid = ?)",
                    new UserMapper(),
                    jid);

            if (!list.isEmpty())
                result = list.get(0);
        }
        return result;
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUsersByName(final Collection<String> unames) {
        if (CollectionUtils.isEmpty(unames))
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().query(
                "SELECT id, nick, banned, lang FROM users WHERE nick IN (:unames)",
                new MapSqlParameterSource("unames", unames),
                new UserMapper());
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUsersByID(final Collection<Integer> uids) {
        if (CollectionUtils.isEmpty(uids))
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().query(
                "SELECT id, nick, banned, lang FROM users WHERE id IN (:ids)",
                new MapSqlParameterSource("ids", uids),
                new UserMapper());
    }

    @Transactional(readOnly = true)
    @Override
    public List<com.juick.User> getUsersByJID(final Collection<String> jids) {
        if (CollectionUtils.isEmpty(jids))
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().query(
                "SELECT users.id, users.nick, jids.jid FROM users " +
                        " INNER JOIN jids ON jids.user_id = users.id " +
                        " WHERE jids.jid IN (:jids)",
                new MapSqlParameterSource("jids", jids),
                (rs, rowNum) -> {
                    com.juick.User user = new com.juick.User();
                    user.setUid(rs.getInt(1));
                    user.setName(rs.getString(2));
                    user.setJid(rs.getString(3));
                    return user;
                });
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getJIDsbyUID(final int uid) {
        return getJdbcTemplate().queryForList("SELECT jid FROM jids WHERE user_id = ? AND active = 1", String.class, uid);
    }

    @Transactional(readOnly = true)
    @Override
    public int getUIDbyJID(final String jid) {
        if (StringUtils.isNotBlank(jid)) {
            List<Integer> list = getJdbcTemplate().queryForList(
                    "SELECT user_id FROM jids WHERE jid = ?", Integer.class, jid);

            if (!list.isEmpty())
                return list.get(0);
        }
        return 0;
    }

    @Transactional(readOnly = true)
    @Override
    public int getUIDbyName(final String uname) {
        if (StringUtils.isNotBlank(uname)) {
            List<Integer> list = getJdbcTemplate().queryForList(
                    "SELECT id FROM users WHERE nick = ?", Integer.class, uname);

            if (!list.isEmpty())
                return list.get(0);
        }
        return 0;
    }

    @Transactional(readOnly = true)
    @Override
    public int getUIDbyHash(final String hash) {
        if (StringUtils.isNotBlank(hash)) {
            List<Integer> list = getJdbcTemplate().queryForList(
                    "SELECT user_id FROM logins WHERE hash = ?", Integer.class, hash);

            if (!list.isEmpty())
                return list.get(0);
        }
        return 0;
    }

    @Transactional(readOnly = true)
    @Override
    public com.juick.User getUserByHash(final String hash) {
        if (StringUtils.isNotBlank(hash)) {
            List<User> list = getJdbcTemplate().query(
                    "SELECT logins.user_id, users.nick, users.banned, users.lang FROM logins " +
                            "INNER JOIN users ON logins.user_id = users.id WHERE logins.hash = ?",
                    new UserMapper(),
                    hash);

            if (!list.isEmpty()) {
                User user = list.get(0);
                user.setAuthHash(hash);
                return user;
            }
        }
        return AnonymousUser.INSTANCE;
    }

    @Transactional
    @Override
    public String getHashByUID(final int uid) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT hash FROM logins WHERE user_id = ?", String.class, uid);

        if (list.isEmpty()) {
            String hash = HashUtils.generateHash(16);
            getJdbcTemplate().update("INSERT INTO logins(user_id, hash) VALUES (?, ?)", uid, hash);
            return hash;
        }
        return list.get(0);
    }

    @Override
    public int getUIDByHttpAuth(String auth) {
        if (auth != null && auth.length() > 8 && auth.startsWith("Basic ")) {
            Base64.Decoder dec = Base64.getDecoder();
            String loginpassw[] = new String(dec.decode(auth.substring(6))).split(":", 2);
            if (loginpassw.length == 2 && loginpassw[0].length() > 1 && loginpassw[0].length() < 16 && loginpassw[0].matches("[a-zA-Z0-9\\-]+") && !loginpassw[1].isEmpty()) {
                return checkPassword(loginpassw[0], loginpassw[1]);
            }
        }
        return 0;
    }

    @Transactional(readOnly = true)
    @Override
    public int checkPassword(final String username, final String password) {
        if (StringUtils.isNotBlank(username)) {
            List<User> list = getJdbcTemplate().query(
                    "SELECT id, nick, banned, passw FROM users WHERE nick = ?",
                    (rs, rowNum) -> {
                        User user = new User();
                        user.setUid(rs.getInt(1));
                        user.setName(rs.getString(2));
                        user.setBanned(rs.getBoolean(3));
                        user.setCredentials(rs.getString(4));
                        return user;
                    },
                    username);

            if (!list.isEmpty()) {
                User user = list.get(0);
                if (Objects.equals(password, user.getCredentials()))
                    return user.getUid();
            }
        }
        return -1;
    }

    @Transactional
    @Override
    public boolean updatePassword(final User user, final String newPassword) {
        return user != null &&
                user.getUid() > 0 &&
                getJdbcTemplate().update("UPDATE users SET passw = ? WHERE id = ?", newPassword, user.getUid()) > 0;
    }

    @Transactional(readOnly = true)
    @Override
    public int getUserOptionInt(final int uid, final String option, final int defaultValue) {
        if (StringUtils.isBlank(option))
            return defaultValue;

        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT " + option + " FROM useroptions WHERE user_id = ?", Integer.class, uid);

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

    @Transactional
    @Override
    public int setUserOptionInt(final int uid, final String option, final int value) {
        if (StringUtils.isBlank(option))
            return 0;

        return getJdbcTemplate().update("UPDATE useroptions SET " + option + "= ? WHERE user_id = ?", value, uid);
    }

    @Transactional(readOnly = true)
    @Override
    public UserInfo getUserInfo(final User user) {
        List<UserInfo> list = getJdbcTemplate().query(
                "SELECT fullname, country, url, descr FROM usersinfo WHERE user_id = ?",
                ((rs, rowNum) -> {
                    UserInfo info = new UserInfo();
                    info.setFullName(rs.getString(1));
                    info.setCountry(rs.getString(2));
                    info.setUrl(rs.getString(3));
                    info.setDescription(rs.getString(4));
                    return info;
                }),
                user.getUid());

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

    @Transactional
    @Override
    public boolean updateUserInfo(final User user, final UserInfo info) {
        return getJdbcTemplate().update(
                "INSERT INTO usersinfo(user_id, fullname, country, url, descr) VALUES (?, ?, ?, ?, ?) " +
                        "ON DUPLICATE KEY UPDATE fullname = ?, country = ?, url = ?, descr = ?",
                user.getUid(),
                info.getFullName(),
                info.getCountry(),
                info.getUrl(),
                info.getDescription(),
                info.getFullName(),
                info.getCountry(),
                info.getUrl(),
                info.getDescription()) > 0;
    }

    @Transactional(readOnly = true)
    @Override
    public boolean getCanMedia(final int uid) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT users.lastphoto - UNIX_TIMESTAMP() FROM users WHERE id = ?",
                Integer.class,
                uid);

        return !list.isEmpty() && list.get(0) < 3600;
    }

    @Transactional(readOnly = true)
    @Override
    public boolean isInWL(final int uid, final int check) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT 1 FROM wl_users WHERE user_id = ? AND wl_user_id = ?",
                Integer.class, uid, check);

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

    @Transactional(readOnly = true)
    @Override
    public boolean isInBL(final int uid, final int check) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT 1 FROM bl_users WHERE user_id = ? AND bl_user_id = ?", Integer.class, uid, check);

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

    @Transactional(readOnly = true)
    @Override
    public boolean isInBLAny(final int uid, final int uid2) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT 1 FROM bl_users WHERE (user_id = ? AND bl_user_id = ?) "
                        + "OR (user_id = ? AND bl_user_id = ?)",
                new Object[]{uid, uid2, uid2, uid},
                Integer.class);

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

    @Transactional(readOnly = true)
    @Override
    public List<Integer> checkBL(final int visitor, final Collection<Integer> uids) {
        if (CollectionUtils.isEmpty(uids))
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT user_id FROM bl_users WHERE bl_user_id = :visitor and user_id IN (:ids)",
                new MapSqlParameterSource()
                        .addValue("visitor", visitor)
                        .addValue("ids", uids),
                Integer.class);
    }

    @Transactional(readOnly = true)
    @Override
    public boolean isSubscribed(final int uid, final int check) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT 1 FROM subscr_users WHERE suser_id = ? AND user_id = ?",
                Integer.class, uid, check);

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

    @Transactional(readOnly = true)
    @Override
    public List<Integer> getUserRead(final int uid) {
        return getJdbcTemplate().queryForList(
                "SELECT user_id FROM subscr_users WHERE suser_id=?", Integer.class, uid);
    }

    @Transactional(readOnly = true)
    @Override
    public List<com.juick.User> getUserReadLeastPopular(final int uid, final int cnt) {
        return getJdbcTemplate().query(
                "SELECT users.id,users.nick FROM (subscr_users " +
                        "INNER JOIN users_subscr ON (subscr_users.suser_id=? " +
                        "AND subscr_users.user_id=users_subscr.user_id)) INNER JOIN users " +
                        "ON subscr_users.user_id=users.id ORDER BY cnt LIMIT ?",
                (rs, num) -> {
                    com.juick.User u = new com.juick.User();
                    u.setUid(rs.getInt(1));
                    u.setName(rs.getString(2));
                    return u;
                },
                uid,
                cnt);
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUserReaders(final int uid) {
        return getJdbcTemplate().query(
                "SELECT users.id, users.nick FROM subscr_users " +
                        "INNER JOIN users ON subscr_users.suser_id=users.id " +
                        "WHERE subscr_users.user_id=? ORDER BY users.nick",
                (rs, num) -> {
                    com.juick.User u = new com.juick.User();
                    u.setUid(rs.getInt(1));
                    u.setName(rs.getString(2));
                    return u;
                },
                uid);
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUserFriends(final int uid) {
        return getJdbcTemplate().query(
                "SELECT users.id,users.nick FROM subscr_users " +
                        "INNER JOIN users ON subscr_users.user_id=users.id " +
                        "WHERE subscr_users.suser_id=? AND users.id!=? " +
                        "ORDER BY users.nick",
                (rs, num) -> {
                    com.juick.User u = new com.juick.User();
                    u.setUid(rs.getInt(1));
                    u.setName(rs.getString(2));
                    return u;
                },
                uid,
                uid);
    }

    @Transactional(readOnly = true)
    @Override
    public List<com.juick.User> getUserBLUsers(final int uid) {
        return getJdbcTemplate().query("SELECT users.id,users.nick FROM users INNER JOIN bl_users " +
                        "ON(bl_users.bl_user_id=users.id) WHERE bl_users.user_id=? ORDER BY users.nick",
                (rs, num) -> {
                    com.juick.User u = new com.juick.User();
                    u.setUid(rs.getInt(1));
                    u.setName(rs.getString(2));
                    return u;
                }, uid);
    }

    @Transactional
    @Override
    public boolean linkTwitterAccount(
            final User user, final String accessToken, final String accessTokenSecret, final String screenName) {
        if (getJdbcTemplate().update("INSERT INTO twitter(user_id,access_token,access_token_secret,uname) " +
                        "VALUES (?,?,?,?)" +
                        " ON DUPLICATE KEY UPDATE access_token=?,access_token_secret=?,uname=?",
                user.getUid(), accessToken, accessTokenSecret, screenName, accessToken, accessTokenSecret, screenName) > 0) {
            return getJdbcTemplate().update("INSERT INTO subscr_users(user_id,suser_id,jid) " +
                    "VALUES (?,1741,'juick\\@twitter.juick.com')", user.getUid()) > 0;
        }
        return false;

    }

    @Transactional(readOnly = true)
    @Override
    public int getStatsIRead(final int uid) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT COUNT(*) FROM subscr_users WHERE suser_id = ?", Integer.class, uid);
        return list.isEmpty() ? 0 : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public int getStatsMyReaders(final int uid) {
        List<Integer> list = getJdbcTemplate().queryForList("SELECT COUNT(*) FROM subscr_users WHERE user_id = ?", Integer.class, uid);
        return list.isEmpty() ? 0 : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public int getStatsMessages(final int uid) {
        List<Integer> list = getJdbcTemplate().queryForList("SELECT COUNT(*) FROM messages WHERE user_id = ?", Integer.class, uid);
        return list.isEmpty() ? 0 : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public int getStatsReplies(final int uid) {
        List<Integer> list = getJdbcTemplate().queryForList("SELECT COUNT(*) FROM replies WHERE user_id = ?", Integer.class, uid);
        return list.isEmpty() ? 0 : list.get(0);
    }

    @Transactional
    @Override
    public boolean setActiveStatusForJID(final String JID, final UserService.ActiveStatus jidStatus) {
        User user = getUserByJID(JID);
        if (user != null) {
            int newStatus = jidStatus == UserService.ActiveStatus.Active ? 1 : 0;
            return getJdbcTemplate().update(
                    "UPDATE jids SET active = ? WHERE user_id = ? AND jid = ?",
                    newStatus, user.getUid(), JID) >= 0;
        }
        return false;
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getAllJIDs(final User user) {
        return getJdbcTemplate().queryForList(
                "SELECT jid FROM jids WHERE user_id=?", String.class, user.getUid());
    }

    @Transactional(readOnly = true)
    @Override
    public List<Auth> getAuthCodes(final User user) {
        return getJdbcTemplate().query(
                "SELECT account,authcode FROM auth WHERE user_id=? AND protocol='xmpp'",
                (rs, num) -> new Auth(rs.getString(1), rs.getString(2)),
                user.getUid());
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getEmails(final User user) {
        return getJdbcTemplate().queryForList("SELECT email FROM emails WHERE user_id=?", String.class, user.getUid());
    }

    @Transactional(readOnly = true)
    @Override
    public EmailOpts getEmailOpts(final User user) {
        List<EmailOpts> list = getJdbcTemplate().query(
                "SELECT email,subscr_hour FROM emails WHERE user_id=? AND subscr_hour IS NOT NULL",
                (rs, num) -> new EmailOpts(rs.getString(1), rs.getInt(2)), user.getUid());
        return list.isEmpty() ? new EmailOpts("", 0) : list.get(0);
    }

    @Transactional(readOnly = true)
    @Override
    public String getEmailHash(final User user) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT hash FROM mail WHERE user_id = ?",
                String.class,
                user.getUid());
        return list.isEmpty() ? StringUtils.EMPTY : list.get(0) + "@mail.juick.com";
    }

    @Transactional
    @Override
    public int deleteLoginForUser(final String name) {
        if (StringUtils.isBlank(name))
            return 0;

        return getJdbcTemplate().update(
                "delete from logins where user_id in (select id from users where nick = ?)", name);
    }

    @Transactional
    @Override
    public int setLoginForUser(final int uid, final String loginHash) {
        if (StringUtils.isEmpty(loginHash))
            return 0;

        return getNamedParameterJdbcTemplate().update(
                "INSERT INTO logins (user_id, hash) VALUES(:uid, :hash) ON DUPLICATE KEY UPDATE hash = :hash",
                new MapSqlParameterSource()
                        .addValue("hash", loginHash)
                        .addValue("uid", uid));
    }

    @Transactional
    @Override
    public void logout(int uid) {
        getJdbcTemplate().update("DELETE FROM logins WHERE user_id=?", uid);
    }

    @Transactional
    @Override
    public boolean deleteJID(int uid, String jid) {
        return getJdbcTemplate().update("DELETE FROM jids WHERE user_id=? AND jid=?", uid, jid) > 0;
    }

    @Transactional
    @Override
    public boolean unauthJID(int uid, String jid) {
        return getJdbcTemplate()
                .update("DELETE FROM auth WHERE user_id=? AND protocol='xmpp' AND account=?", uid, jid) > 0;
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getActiveJIDs() {
        return getJdbcTemplate().queryForList("SELECT jid FROM jids WHERE active=1 AND loginhash IS NULL", String.class);
    }
}