import numpy as np
import pandas as pd
import pymysql
from dbutils.pooled_db import PooledDB
import os

from pandas import DataFrame
from pymysql.cursors import DictCursor

from conf.db import mysql_config
from utils.log.trans_log import trans_print


class ConnectMysqlPool:
    """
    连接MySQL数据库的连接池类。

    属性:
    db_account (dict): 数据库账号信息，包括用户名和密码等。
    db (str): 数据库名称。
    pool (PooledDB): MySQL连接池对象。

    方法:
    __init__: 初始化连接池类实例。
    _obtaining_data: 从配置文件中获取测试数据。
    create_mysql_pool: 创建MySQL连接池。
    get_conn: 从连接池中获取一个连接。
    close: 关闭数据库连接和游标。
    execute: 使用连接执行SQL语句。
    """

    def __init__(self, connet_name):
        """
        初始化连接池类实例。

        参数:
        db (str): 测试库名称。
        db_account (dict): 包含数据库账号信息的字典。
        """
        file_path = os.path.join(
            os.path.dirname(os.path.dirname(os.path.dirname(__file__))),
            "conf",
            "db.yaml"
        )
        self.yaml_data = mysql_config
        self.connet_name = connet_name

        # 创建连接池
        self.pool = self.create_mysql_pool()

    # 创建MySQL连接池
    def create_mysql_pool(self):
        """
        根据配置信息创建MySQL连接池。

        返回:
        PooledDB: MySQL连接池对象。
        """
        pool = PooledDB(
            **self.yaml_data[self.connet_name + '_connect_pool_config'],
            **self.yaml_data[self.connet_name],
            ping=2,
            creator=pymysql
        )
        return pool

    # 从连接池中获取一个连接
    def get_conn(self):
        """
        从连接池中获取一个数据库连接。

        返回:
        connection: 数据库连接对象。
        """
        return self.pool.connection()

    # 使用连接执行sql
    def execute(self, sql, params=tuple()):
        """
        使用获取的连接执行SQL语句。

        参数:
        sql (str): SQL语句。
        params (tuple): SQL参数。

        返回:
        list: 执行SQL语句后的结果集，若执行出错则返回None。
        """

        with self.get_conn() as conn:
            with conn.cursor(cursor=DictCursor) as cursor:
                try:
                    cursor.execute(sql, params)
                    trans_print("开始执行SQL:", cursor._executed)
                    conn.commit()
                    result = cursor.fetchall()
                    return result
                except Exception as e:
                    trans_print(f"执行sql：{sql}，报错：{e}")
                    conn.rollback()
                    raise e

    def save_dict(self, table_name: str, params: dict):
        keys = params.keys()
        col_str = ",".join(keys)
        data_s_str = ",".join(["%s"] * len(keys))

        insert_sql = f"replace into {table_name} ({col_str}) values ({data_s_str})"
        with self.get_conn() as conn:
            with conn.cursor() as cursor:
                try:
                    cursor.execute(insert_sql, tuple(params.values()))
                    conn.commit()
                except Exception as e:
                    trans_print(f"执行sql：{insert_sql}，报错：{e}")
                    conn.rollback()
                    raise e

    # 使用连接执行sql
    def df_batch_save(self, table_name: str, df: DataFrame, batch_count=20000):
        col_str = ",".join(df.columns)
        data_s_str = ",".join(["%s"] * len(df.columns))

        insert_sql = f"INSERT INTO `{table_name}` ({col_str}) values ({data_s_str})"

        # 转化nan到null
        df.replace(np.nan, None, inplace=True)

        total_count = df.shape[0]
        for i in range(0, total_count + 1, batch_count):
            with self.get_conn() as conn:
                with conn.cursor() as cursor:
                    try:
                        query_df = df.iloc[i:i + batch_count]
                        if not query_df.empty:
                            values = [tuple(data) for data in query_df.values]
                            cursor.executemany(insert_sql, values)
                            conn.commit()
                            result = cursor.fetchall()
                            trans_print(
                                "总条数" + str(df.shape[0]) + ",已保存:" + str(i + batch_count))
                    except Exception as e:
                        conn.rollback()
                        raise e


if __name__ == '__main__':
    plt = ConnectMysqlPool("plt")

    print(plt.execute("select * from data_transfer limit 2"))

    trans = ConnectMysqlPool("trans")

    df = pd.DataFrame()
    df['name'] = ['name' + str(i) for i in range(1000)]

    print(trans.df_batch_save('test', df, 33))