# -*- coding: utf-8 -*-
# Author  : Charley
# Python  : 3.8.10
# Date: 2024-08-05 19:42
import pymysql
import YamlLoader
from loguru import logger
from retrying import retry
from dbutils.pooled_db import PooledDB

# 获取yaml配置
yaml = YamlLoader.readYaml()
mysqlYaml = yaml.get("mysql")
sql_host = mysqlYaml.getValueAsString("host")
sql_port = mysqlYaml.getValueAsInt("port")
sql_user = mysqlYaml.getValueAsString("username")
sql_password = mysqlYaml.getValueAsString("password")
sql_db = mysqlYaml.getValueAsString("db")


class MySQLConnectionPool:
    """
    MySQL连接池
    """

    def __init__(self, mincached=1, maxcached=3, maxconnections=5, log=None):
        """
        初始化连接池
        :param mincached: 初始化时，链接池中至少创建的链接，0表示不创建
        :param maxcached: 池中空闲连接的最大数目（0 或 None 表示池大小不受限制）
        :param maxconnections: 允许的最大连接数（0 或 None 表示任意数量的连接）
        """
        # 使用 loguru 的 logger，如果传入了其他 logger，则使用传入的 logger
        self.log = log or logger
        self.pool = PooledDB(
            creator=pymysql,
            mincached=mincached,
            maxcached=maxcached,
            maxconnections=maxconnections,
            blocking=True,  # 连接池中如果没有可用连接后，是否阻塞等待。True，等待；False，不等待然后报错
            host=sql_host,
            port=sql_port,
            user=sql_user,
            password=sql_password,
            database=sql_db
        )

    @retry(stop_max_attempt_number=100, wait_fixed=600000)
    def _get_connection(self):
        """
        获取连接
        :return: 连接
        """
        try:
            return self.pool.connection()
        except Exception as e:
            self.log.error(f"Failed to get connection from pool: {e}, wait 10 mins retry")
            raise e

    @staticmethod
    def _close_connection(conn):
        """
        关闭连接
        :param conn: 连接
        """
        if conn:
            conn.close()

    @retry(stop_max_attempt_number=5, wait_fixed=1000)
    def _execute(self, query, args=None, commit=False):
        """
        执行SQL
        :param query: SQL语句
        :param args: SQL参数
        :param commit: 是否提交事务
        :return: 查询结果
        """
        conn = None
        cursor = None
        try:
            conn = self._get_connection()
            cursor = conn.cursor()
            cursor.execute(query, args)
            if commit:
                conn.commit()
            self.log.debug(f"sql _execute , Query: {query}, Rows: {cursor.rowcount}")
            return cursor
        except Exception as e:
            if conn and not commit:
                conn.rollback()
            self.log.error(f"Error executing query: {e}")
            raise e
        finally:
            if cursor:
                cursor.close()
            self._close_connection(conn)

    def select_one(self, query, args=None):
        """
        执行查询，返回单个结果
        :param query: 查询语句
        :param args: 查询参数
        :return: 查询结果
        """
        cursor = self._execute(query, args)
        return cursor.fetchone()

    def select_all(self, query, args=None):
        """
        执行查询，返回所有结果
        :param query: 查询语句
        :param args: 查询参数
        :return: 查询结果
        """
        cursor = self._execute(query, args)
        return cursor.fetchall()

    def insert_one(self, query, args):
        """
        执行单条插入语句
        :param query: 插入语句
        :param args: 插入参数
        """
        # self.log.info('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>data insert_one 入库中>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>')
        return self._execute(query, args, commit=True)

    def insert_all(self, query, args_list):
        """
        执行批量插入语句，如果失败则逐条插入
        :param query: 插入语句
        :param args_list: 插入参数列表
        """
        conn = None
        cursor = None
        try:
            conn = self._get_connection()
            cursor = conn.cursor()
            cursor.executemany(query, args_list)
            conn.commit()
            self.log.debug(f"sql insert_all , SQL: {query}, Rows: {cursor.rowcount}")
            self.log.info('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>data insert_all 入库中>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>')
        except Exception as e:
            conn.rollback()
            self.log.error(f"Batch insertion failed after 5 attempts. Trying single inserts. Error: {e}")
            # 如果批量插入失败，则逐条插入
            rowcount = 0
            for args in args_list:
                self.insert_one(query, args)
                rowcount += 1
            self.log.debug(f"Batch insertion failed. Inserted {rowcount} rows individually.")
        finally:
            cursor.close()
            self._close_connection(conn)

    def update_one(self, query, args):
        """
        执行单条更新语句
        :param query: 更新语句
        :param args: 更新参数
        """
        self.log.info('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>data update_one 更新中>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>')
        return self._execute(query, args, commit=True)

    def update_all(self, query, args_list):
        """
        执行批量更新语句，如果失败则逐条更新
        :param query: 更新语句
        :param args_list: 更新参数列表
        """
        conn = None
        cursor = None
        try:
            conn = self._get_connection()
            cursor = conn.cursor()
            cursor.executemany(query, args_list)
            conn.commit()
            self.log.debug(f"sql update_all , SQL: {query}, Rows: {cursor.rowcount}")
            self.log.info('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>data update_all 更新中>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>')
        except Exception as e:
            conn.rollback()
            self.log.error(f"Error executing query: {e}")
            # 如果批量更新失败，则逐条更新
            rowcount = 0
            for args in args_list:
                self.update_one(query, args)
                rowcount += 1
            self.log.debug(f'Batch update failed. Updated {rowcount} rows individually.')

        finally:
            cursor.close()
            self._close_connection(conn)