package com.juick.service;

import com.juick.Tag;
import com.juick.User;
import com.juick.server.helpers.NotifyOpts;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import javax.inject.Inject;
import java.util.*;
import java.util.stream.Collectors;

/**
 * Created by aalexeev on 11/13/16.
 */
@Repository
public class SubscriptionServiceImpl extends BaseJdbcService implements SubscriptionService {
    private final UserService userService;
    private final MessagesService messagesService;

    @Inject
    public SubscriptionServiceImpl(JdbcTemplate jdbcTemplate, UserService userService, MessagesService messagesService) {
        super(jdbcTemplate, null);

        Assert.notNull(userService);
        this.userService = userService;

        Assert.notNull(messagesService);
        this.messagesService = messagesService;
    }

    @Transactional(readOnly = true)
    @Override
    public List<String> getJIDSubscribedToUser(final int uid, final boolean friendsonly) {
        if (friendsonly == false) {
            return getJdbcTemplate().queryForList(
                    "SELECT jids.jid FROM subscr_users INNER JOIN jids " +
                            "ON (subscr_users.user_id=? AND subscr_users.suser_id=jids.user_id) WHERE jids.active=1",
                    String.class,
                    uid);
        } else {
            return getJdbcTemplate().queryForList(
                    "SELECT jids.jid FROM subscr_users INNER JOIN jids " +
                            "ON (subscr_users.user_id=? AND subscr_users.suser_id=jids.user_id) WHERE jids.active=1 " +
                            "AND jids.user_id IN (SELECT wl_user_id FROM wl_users WHERE user_id=?)",
                    String.class,
                    uid,
                    uid);
        }
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getSubscribedUsers(final int uid, final int mid) {
        User author = messagesService.getMessageAuthor(mid);

        List<User> userids = userService.getUserReaders(uid);

        Set<Integer> set = new HashSet<>();
        set.addAll(userids.stream().map(User::getUid).collect(Collectors.toList()));
        List<Integer> tags = messagesService.getMessageTagsIDs(mid);
        if (tags.size() > 0) {
            String tagsStr = StringUtils.arrayToCommaDelimitedString(tags.toArray());
            List<Integer> tagUsers = getJdbcTemplate().queryForList("SELECT suser_id FROM subscr_tags " +
                    "WHERE tag_id IN (" + tagsStr + ") AND suser_id!=? " +
                    " AND suser_id NOT IN (SELECT user_id FROM bl_users WHERE bl_user_id=?)" +
                    " AND suser_id NOT IN (SELECT user_id FROM bl_tags WHERE tag_id IN (" + tagsStr + "))", Integer.class, uid, author.getUid());
            set.addAll(tagUsers);
        }
        return userService.getUsersByID(new ArrayList<>(set));
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUsersSubscribedToComments(final int mid, final int ignore_uid) {
        List<Integer> userids = getJdbcTemplate().queryForList(
                "SELECT suser_id FROM subscr_messages WHERE message_id=? AND suser_id!=?",
                Integer.class,
                mid,
                ignore_uid);
        if (userids.size() > 0) {
            return userService.getUsersByID(userids);
        } else {
            return Collections.emptyList();
        }
    }

    @Transactional(readOnly = true)
    @Override
    public List<User> getUsersSubscribedToUserRecommendations(final int uid, final int mid, final int muid) {
        List<Integer> tags = messagesService.getMessageTagsIDs(mid);

        String query = "SELECT suser_id FROM subscr_users WHERE user_id=" + uid;
        query += " AND user_id NOT IN (SELECT user_id FROM bl_users WHERE bl_user_id=" + muid + ")";
        query += " AND user_id NOT IN (SELECT suser_id FROM subscr_users WHERE user_id=" + muid + ")";
        query += " AND user_id NOT IN (SELECT suser_id FROM subscr_messages WHERE message_id=" + mid + ")";
        query += " AND user_id NOT IN (SELECT user_id FROM favorites WHERE message_id=" + mid + ")";
        query += " AND user_id NOT IN (SELECT subscr_users.suser_id FROM subscr_users INNER JOIN favorites ON (favorites.message_id=" + mid + " AND subscr_users.user_id=favorites.user_id AND favorites.user_id!=" + uid + "))";

        if (!tags.isEmpty()) {
            String tagsStr = StringUtils.arrayToCommaDelimitedString(tags.toArray());
            query += " AND user_id NOT IN (SELECT suser_id FROM subscr_tags WHERE tag_id IN (" + tagsStr + "))";
            query += " AND user_id NOT IN (SELECT user_id FROM bl_tags WHERE tag_id IN (" + tagsStr + "))";
        }

        List<Integer> userids = getJdbcTemplate().queryForList(query, Integer.class);

        return userService.getUsersByID(userids);
    }

    @Transactional
    @Override
    public boolean subscribeMessage(final int mid, final int vuid) {
        return getJdbcTemplate().update(
                "INSERT IGNORE INTO subscr_messages(suser_id,message_id) VALUES (" + vuid + "," + mid + ")") == 1;
    }

    @Transactional
    @Override
    public boolean unSubscribeMessage(final int mid, final int vuid) {
        return getJdbcTemplate().update(
                "DELETE FROM subscr_messages WHERE message_id=? AND suser_id=?",
                mid, vuid) > 0;
    }

    @Transactional
    @Override
    public boolean subscribeUser(final User user, final User toUser) {
        return getJdbcTemplate().update(
                "INSERT IGNORE INTO subscr_users(user_id,suser_id) VALUES (?,?)",
                toUser.getUid(), user.getUid()) == 1;
    }

    @Transactional
    @Override
    public boolean unSubscribeUser(final User user, final User fromUser) {
        return getJdbcTemplate().update(
                "DELETE FROM subscr_users WHERE suser_id=? AND user_id=?",
                user.getUid(), fromUser.getUid()) > 0;
    }

    @Transactional
    @Override
    public boolean subscribeTag(final User user, final Tag toTag) {
        return getJdbcTemplate().update(
                "INSERT IGNORE INTO subscr_tags(tag_id,suser_id) VALUES (?,?)",
                toTag.TID, user.getUid()) == 1;
    }

    @Transactional
    @Override
    public boolean unSubscribeTag(final User user, final Tag toTag) {
        return getJdbcTemplate().update(
                "DELETE FROM subscr_tags WHERE tag_id=? AND suser_id=?",
                toTag.TID, user.getUid()) > 0;
    }

    @Transactional(readOnly = true)
    @Override
    public NotifyOpts getNotifyOptions(final User user) {
        try {
            return getJdbcTemplate().queryForObject(
                    "SELECT jnotify,subscr_notify,recommendations FROM useroptions WHERE user_id=?",
                    (rs, num) -> {
                        NotifyOpts options = new NotifyOpts();
                        options.setRepliesEnabled(rs.getInt(1) > 0);
                        options.setSubscriptionsEnabled(rs.getInt(2) > 0);
                        options.setRecommendationsEnabled(rs.getInt(3) > 0);
                        return options;
                    },
                    user.getUid());
        } catch (EmptyResultDataAccessException e) {
            return new NotifyOpts();
        }
    }

    @Transactional
    @Override
    public boolean setNotifyOptions(final User user, final NotifyOpts options) {
        return getJdbcTemplate().update(
                "UPDATE useroptions SET jnotify=? WHERE user_id=?", options.isRepliesEnabled() ? 1 : 0,
                user.getUid()) > 0 &&
                getJdbcTemplate().update(
                        "UPDATE useroptions SET subscr_notify=? WHERE user_id=?", options.isSubscriptionsEnabled() ? 1 : 0,
                        user.getUid()) > 0 &&
                getJdbcTemplate().update(
                        "UPDATE useroptions SET recommendations=? WHERE user_id=?", options.isRecommendationsEnabled() ? 1 : 0,
                        user.getUid()) > 0;
    }
}