#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
__title__ = 'MySQL数据库连接池对象'

@Time    : 2020/9/26 18:36
@Author  : Kenny-PC
@Software: PyCharm

# code is far away from bugs with the god animal protecting
    I love animals. They taste delicious.
              ┏┓      ┏┓
            ┏┛┻━━━┛┻┓
            ┃      ☃      ┃
            ┃  ┳┛  ┗┳  ┃
            ┃      ┻      ┃
            ┗━┓      ┏━┛
                ┃      ┗━━━┓
                ┃  神兽保佑    ┣┓
                ┃　永无BUG！   ┏┛
                ┗┓┓┏━┳┓┏┛
                  ┃┫┫  ┃┫┫
                  ┗┻┛  ┗┻┛
"""

import configparser
import logging
import os

import pymysql
from DBUtils.PooledDB import PooledDB


class MySQLConnection():
    """
    数据库连接池代理对象
    查询参数主要有两种类型
    第一种：传入元祖类型,例如(12,13),这种方式主要是替代SQL语句中的%s展位符号
    第二种: 传入字典类型,例如{"id":13},此时我们的SQL语句需要使用键来代替展位符,例如：%(name)s
    """

    def __init__(self):
        # 得到当前文件的父目录
        parent_dir_path = os.path.dirname(os.path.abspath('.'))
        db_config_path = parent_dir_path + '/tests/conf/db_config.ini'
        # print('数据库配置文件：', db_config_path)

        # 读取数据库配置信息
        config = configparser.ConfigParser()
        config.read(db_config_path, encoding='UTF-8')
        sections = config.sections()

        mysql_config_section = 'mysql_config'

        if mysql_config_section not in sections:
            print('ERROR：数据库配置文件【{db_config_path}】没有名为 mysql_config 的 section'.format(db_config_path=db_config_path))
            exit()

        # 读取相关属性
        maxconnections = config.get(mysql_config_section, "maxconnections")
        mincached = config.get(mysql_config_section, "mincached")
        maxcached = config.get(mysql_config_section, "maxcached")
        host = config.get(mysql_config_section, "host")
        port = config.get(mysql_config_section, "port")
        user = config.get(mysql_config_section, "user")
        password = config.get(mysql_config_section, "password")
        database = config.get(mysql_config_section, "database")
        databasePooled = PooledDB(creator=pymysql,
                                  maxconnections=int(maxconnections),
                                  mincached=int(mincached),
                                  maxcached=int(maxcached),
                                  blocking=True,
                                  cursorclass=pymysql.cursors.DictCursor,
                                  host=host,
                                  port=int(port),
                                  user=user,
                                  password=password,
                                  database=database)
        self.connect = databasePooled.connection()
        self.cursor = self.connect.cursor()
        logging.debug("获取数据库连接对象成功,连接池对象:{}".format(str(self.connect)))

    def execute(self, sql, param=None):
        """
        基础更新、插入、删除操作
        :param sql:
        :param param:
        :return: 受影响的行数
        """
        ret = None
        try:
            if param == None:
                ret = self.cursor.execute(sql)
            else:
                ret = self.cursor.execute(sql, param)
        except TypeError as te:
            logging.debug("类型错误")
            logging.exception(te)
        return ret

    def query(self, sql, param=None):
        """
        查询数据库
        :param sql: 查询SQL语句
        :param param: 参数
        :return: 返回集合
        """
        self.cursor.execute(sql, param)
        result = self.cursor.fetchall()
        return result

    def queryOne(self, sql, param=None):
        """
        查询数据返回第一条
        :param sql: 查询SQL语句
        :param param: 参数
        :return: 返回第一条数据的字典
        """
        result = self.query(sql, param)
        if result:
            return result[0]
        else:
            return None

    def listByPage(self, sql, current_page, page_size, param=None):
        """
        分页查询当前表格数据
        :param sql: 查询SQL语句
        :param current_page: 当前页码
        :param page_size: 页码大小
        :param param:参数
        :return:
        """
        countSQL = "select count(*) ct from (" + sql + ") tmp "
        logging.debug("统计SQL:{}".format(sql))
        countNum = self.count(countSQL, param)
        offset = (current_page - 1) * page_size
        totalPage = int(countNum / page_size)
        if countNum % page_size > 0:
            totalPage = totalPage + 1
        pagination = {"current_page": current_page, "page_size": page_size, "count": countNum, "total_page": totalPage}
        querySql = "select * from (" + sql + ") tmp limit %s,%s"
        logging.debug("查询SQL:{}".format(querySql))
        # 判断是否有参数
        if param == None:
            # 无参数
            pagination["data"] = self.query(querySql, (offset, page_size))
        else:
            # 有参数的情况,此时需要判断参数是元祖还是字典
            if isinstance(param, dict):
                # 字典的情况,因此需要添加字典
                querySql = "select * from (" + sql + ") tmp limit %(tmp_offset)s,%(tmp_pageSize)s"
                param["tmp_offset"] = offset
                param["tmp_pageSize"] = page_size
                pagination["data"] = self.query(querySql, param)
            elif isinstance(param, tuple):
                # 元祖的方式
                listtp = list(param)
                listtp.append(offset)
                listtp.append(page_size)
                pagination["data"] = self.query(querySql, tuple(listtp))
            else:
                # 基础类型
                listtp = []
                listtp.append(param)
                listtp.append(offset)
                listtp.append(page_size)
                pagination["data"] = self.query(querySql, tuple(listtp))
        return pagination

    def count(self, sql, param=None):
        """
        统计当前表记录行数
        :param sql: 统计SQL语句
        :param param: 参数
        :return: 当前记录行
        """
        ret = self.queryOne(sql, param)
        count = None
        if ret:
            for k, v in ret.items():
                count = v
        return count

    def insert(self, sql, param=None):
        """
        数据库插入
        :param sql: SQL语句
        :param param: 参数
        :return: 受影响的行数
        """
        return self.execute(sql, param)

    def update(self, sql, param=None):
        """
        更新操作
        :param sql: SQL语句
        :param param: 参数
        :return: 受影响的行数
        """
        return self.execute(sql, param)

    def delete(self, sql, param=None):
        """
        删除操作
        :param sql: 删除SQL语句
        :param param: 参数
        :return: 受影响的行数
        """
        return self.execute(sql, param)

    def batch(self, sql, param=None):
        """
        批量插入
        :param sql: 插入SQL语句
        :param param: 参数
        :return: 受影响的行数
        """
        return self.cursor.executemany(sql, param)

    def commit(self, param=None):
        """
        提交数据库
        :param param:
        :return:
        """
        if param == None:
            self.connect.commit()
        else:
            self.connect.rollback()

    def close(self):
        """
        关闭数据库连接
        :return:
        """
        if self.cursor:
            self.cursor.close()
        if self.connect:
            self.connect.close()
        logging.debug("释放数据库连接")
        return None