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package com.juick.service;

import com.juick.User;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Optional;
import java.util.UUID;

@Repository
public class MessengerServiceImpl extends BaseJdbcService implements MessengerService {

    @Transactional(readOnly = true)
    @Override
    public Integer getUserId(String senderId) {
        List<Integer> list = getJdbcTemplate().queryForList(
                "SELECT id FROM users INNER JOIN messenger " +
                        "ON messenger.user_id = users.id WHERE messenger.sender_id=?", Integer.class, senderId);

        return list.isEmpty() ? 0 : list.get(0);
    }
    @Transactional(readOnly = true)
    @Override
    public Optional<String> getSenderId(User user) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT sender_id FROM messenger " +
                        "WHERE user_id=?", String.class, user.getUid());

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

    @Transactional
    @Override
    public boolean createMessengerUser(String senderId, String displayName) {
        return getJdbcTemplate().update(
                "INSERT INTO messenger(sender_id, display_name, loginhash) VALUES(?,?,?)",
                senderId, displayName, UUID.randomUUID().toString()) > 0;
    }
    @Transactional(readOnly = true)
    @Override
    public String getDisplayName(String hash) {
        try {
            return getJdbcTemplate().queryForObject("SELECT display_name FROM messenger WHERE loginhash=?", String.class, hash);
        } catch (EmptyResultDataAccessException e) {
            return null;
        }
    }
    @Transactional
    @Override
    public String getSignUpHash(final String senderId, final String username) {
        List<String> list = getJdbcTemplate().queryForList(
                "SELECT loginhash FROM messenger WHERE sender_id = ? AND user_id IS NULL",
                String.class,
                senderId);

        if (list.isEmpty()) {
            String hash = UUID.randomUUID().toString();
            getJdbcTemplate().update(
                    "INSERT INTO messenger(sender_id, loginhash, display_name) VALUES (?, ?, ?)", senderId, hash, username);
            return hash;
        }
        return list.get(0);
    }
    @Transactional
    @Override
    public boolean linkMessengerUser(String hash, int uid) {
        return getJdbcTemplate().update("UPDATE messenger SET user_id=?, loginhash=NULL WHERE loginhash=?", uid, hash) > 0;
    }
}