# Copyright (c) Facebook, Inc. and its affiliates.

# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

from __future__ import absolute_import, division, print_function, unicode_literals

import pymysql.cursors


class MySQLUtil:
    def __init__(self, host="", port=0, user="", password=""):
        if host and port and user and password:
            self.db_host = host
            self.db_port = int(port)
            self.db_user = user
            self.db_password = password
        else:
            raise ValueError("Wrong input parameters")

    def create_connection(self):
        connection = pymysql.connect(
            host=self.db_host,
            port=self.db_port,
            user=self.db_user,
            password=self.db_password,
            cursorclass=pymysql.cursors.DictCursor,
        )
        return connection

    def try_connect(self):
        connection = self.create_connection()
        connection.close()

    def get_mysql_version(self):
        connection = self.create_connection()
        with connection:
            cursor = connection.cursor()
            cursor.execute("SELECT version()")
            result = cursor.fetchone()
            return result["version()"]

    def user_has_privileges(self, user, privileges):
        connection = self.create_connection()
        with connection:
            cursor = connection.cursor()
            sql = "SELECT {} FROM mysql.user WHERE user=%s".format(",".join(privileges))
            cursor.execute(sql, (user,))
            result = cursor.fetchone()
            return result