import os
import logging


def init_logger():
    '''
    Functions initiates a logger instance.
    '''
    os.makedirs('logs', exist_ok=True)
    logging.basicConfig(filename='logs/nopaqued.log',
                        format='[%(asctime)s] %(levelname)s in '
                               '%(pathname)s:%(lineno)d - %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S', filemode='w')
    NOPAQUE_LOG_LEVEL = os.environ.get('NOPAQUE_LOG_LEVEL')
    if NOPAQUE_LOG_LEVEL is None:
        FLASK_CONFIG = os.environ.get('FLASK_CONFIG')
        if FLASK_CONFIG == 'development':
            logging.basicConfig(level='DEBUG')
        elif FLASK_CONFIG == 'testing':
            # TODO: Set an appropriate log level
            pass
        elif FLASK_CONFIG == 'production':
            logging.basicConfig(level='ERROR')
    else:
        logging.basicConfig(level=NOPAQUE_LOG_LEVEL)
    return logging.getLogger(__name__)


if __name__ == '__main__':
    init_logger()