import sqlite3

class Database:
    def __init__(self, db_file):
        self.connection = sqlite3.connect(db_file)
        self.cursor = self.connection.cursor()

    def user_exists(self, user_id):
        with self.connection:
            result = self.cursor.execute("SELECT * FROM 'users' WHERE 'user_id' = ?", (user_id,)).fetchall()
            return bool(len(result))

    def add_user(self, user_id):
        with self.connection:
            self.cursor.execute("INSERT INTO 'users' ('user_id') VALUES (?)", (user_id,))

    def get_nickname(self, user_id):
        with self.connection:
            result = self.cursor.execute("SELECT `user_id` FROM `users` WHERE `user_id` = ?", (user_id,)).fetchall()
            for row in result:
                user_id = str(row[0])
            return user_id

    def user_money(self, user_id):
        with self.connection:
            result = self.cursor.execute("SELECT 'money' FROM 'users' WHERE 'user_id' = ?", (user_id,)).fetchmany(1)
            return int(result[0][0])