import os
import traceback

import pymysql
from pymysql.cursors import DictCursor
from sqlalchemy import create_engine

from utils.conf.read_conf import yaml_conf
from utils.log.trans_log import trans_print


class ConnectMysql:

    def __init__(self, connet_name):
        #self.yaml_data = yaml_conf("/data/config/etl_config.yaml")
        self.yaml_data = yaml_conf(os.environ.get('ETL_CONF', "/data/config/etl_config.yaml"))
        self.connet_name = connet_name
        if 'env' in os.environ:
            self.env = os.environ['env']
        else:
            self.env = 'dev'

    # 从连接池中获取一个连接
    def get_conn(self):
        return pymysql.connect(**self.yaml_data[self.connet_name + "_" + self.env])

    # 使用连接执行sql
    def execute(self, sql, params=tuple()):

        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}")
                    trans_print(traceback.format_exc())
                    conn.rollback()
                    raise e

    def execute_df_save(self, df, table_name):
        config = self.yaml_data[self.connet_name + "_" + self.env]
        username = config['user']
        password = config['password']
        host = config['host']
        port = config['port']
        dbname = config['database']
        engine = create_engine(f'mysql+pymysql://{username}:{password}@{host}:{port}/{dbname}')
        df.to_sql(table_name, engine, index=False, if_exists='append')