import logging
import sys

enabled = []
disabled = ["init", "sdp", "parsers", "evaluators", "verbose", "stats"]

console_handler = logging.StreamHandler(sys.stdout)

all_loggers = {}

def init_config(loggers):
    if loggers is None:
        return

    if not hasattr(loggers, "__iter__"):
        loggers = [loggers]

    if "all" in loggers:
        disabled.clear()

    for logger in loggers:
        if logger == "all":
            continue

        if logger.startswith("-"):
            disabled.append(logger[1:])
        elif logger.startswith("+"):
            enabled.append(logger[1:])
        else:
            enabled.append(logger)


def to_discard(logger_class):
    if logger_class is None:
        return False

    if logger_class in enabled or logger_class.strip(".") in enabled:
        return False

    if logger_class not in disabled:
        return False

    return True


def get_logger(logger_name):
    if logger_name in all_loggers:
        return all_loggers[logger_name]

    logger = logging.getLogger(logger_name)
    all_loggers[logger_name] = logger

    for d in disabled:
        if (logger_name == d or logger_name.startswith(d + ".")) and to_discard(d):
            logger.disabled = True

    for e in enabled:
        if logger_name.startswith("verbose." + e):
            logger.disabled = False

    return logger