import logging


def getlogger():
    # create a custom logger if no log handler
    logger = logging.getLogger(__name__)
    if not logger.hasHandlers():
        logger.setLevel(logging.INFO)
        # create handlers
        warn_handler = logging.StreamHandler()
        info_handler = logging.StreamHandler()
        error_handler = logging.FileHandler('bot.log', mode='a')
        warn_handler.setLevel(logging.WARNING)
        error_handler.setLevel(logging.ERROR)
        info_handler.setLevel(logging.INFO)

        # create formatters
        warn_format = logging.Formatter(
            '%(name)s - %(funcName)s - %(levelname)s - %(message)s')
        error_format = logging.Formatter(
            '%(asctime)s - %(name)s - %(funcName)s - %(levelname)s - %(message)s')
        info_format = logging.Formatter('%(message)s')

        # set formatter
        warn_handler.setFormatter(warn_format)
        error_handler.setFormatter(error_format)
        info_handler.setFormatter(info_format)

        # add handlers to logger
        logger.addHandler(warn_handler)
        logger.addHandler(error_handler)
        logger.addHandler(info_handler)

    return logger