import mysql.connector
import pydapper
import logging
import json
import os
import sys

config_path = None

def initPool(instancePath, connection_filename="connection_data_devel.json"):
    try:
        global config_path
        if(config_path == None):
            config_path = os.path.join(instancePath,f'../../../secure/{connection_filename}') #connection_data_devel.json');

        print (config_path)

        if not os.path.exists(config_path):
            print ('cannot find ' + os.path.abspath(config_path))
            print("instance path", instancePath)
            sys.exit(1)

        f = open(config_path);
        connection_data = json.load(f)

        conn_from_pool = mysql.connector.connect(**connection_data)

        commands = pydapper.using(conn_from_pool)
        data = commands.query("SELECT id from `user`")
        print("DB connection successful")
        conn_from_pool.close()
    except mysql.connector.PoolError as e:
        logging.error(f"Failed to create connection pool: {e}")
        print(e)
    except Exception as e:
        print(e)

def getPoolConnection():
    global config_path
    f = open(config_path);
    connection_data = json.load(f)
    return mysql.connector.connect(**connection_data)