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/*
 * Copyright (C) 2008-2020, 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.model.User;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;

/**
 * Created by aalexeev on 11/13/16.
 */
@Repository
@Transactional(readOnly = true)
public class ShowQueriesServiceImpl extends BaseJdbcService implements ShowQueriesService {

    @Override
    public List<String> getRecommendedUsers(final User forUser) {
        if (forUser == null)
            return Collections.emptyList();

        return getNamedParameterJdbcTemplate().queryForList(
                "SELECT u.nick FROM subscr_users su1 INNER JOIN users u " +
                        "ON su1.user_id = u.id " +
                        "WHERE NOT EXISTS (SELECT 1 FROM subscr_users su2 WHERE su2.suser_id = :uid and su1.user_id = su2.user_id) " +
                        "AND EXISTS (SELECT 1 FROM subscr_users su3 WHERE su3.suser_id = :uid and su3.user_id = su1.suser_id ) " +
                        "AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid and su1.user_id = b.bl_user_id) " +
                        "AND su1.user_id != :uid AND u.lastmessage > UNIX_TIMESTAMP() - 259200 " +
                        "GROUP BY su1.user_id ORDER BY count(*) DESC LIMIT 10",
                new MapSqlParameterSource("uid", forUser.getUid()),
                String.class);
    }

    @Override
    public List<String> getTopUsers() {
        return getJdbcTemplate().query(
                "SELECT users.nick,COUNT(subscr_users.suser_id) AS cnt " +
                        "FROM (subscr_users INNER JOIN users ON subscr_users.user_id=users.id) " +
                        "INNER JOIN useroptions ON users.id=useroptions.user_id " +
                        "WHERE useroptions.privacy_view>0 AND users.lastmessage > UNIX_TIMESTAMP() - 259200 " +
                        "AND users.id!=2 GROUP BY subscr_users.user_id ORDER BY cnt DESC LIMIT 10",
                (rs, rowNum) -> rs.getString(1));
    }
}