#!/usr/bin/python3

import logging
import logging.handlers
import sys
import traceback

from config import Config


class LevelTagFilter(logging.Filter):
    "Add leveltag"

    def filter(self, record):
        # Extract the first character of the level name
        record.leveltag = record.levelname[0]

        # We never actually filter messages out, just abuse filtering to add an
        # extra field to the LogRecord
        return True


log = logging.getLogger(Config.LOG_NAME)
log.setLevel(logging.DEBUG)

# stderr
stderr = logging.StreamHandler()
stderr.setLevel(Config.LOG_LEVEL_STDERR)

# syslog
syslog = logging.handlers.SysLogHandler(address='/dev/log')
syslog.setLevel(Config.LOG_LEVEL_SYSLOG)

# Filter
filter = LevelTagFilter()
syslog.addFilter(filter)
stderr.addFilter(filter)

# create formatter and add it to the handlers
stderr_fmt = logging.Formatter('%(leveltag)s: %(message)s')
syslog_fmt = logging.Formatter('[%(name)s] %(leveltag)s: %(message)s')
stderr.setFormatter(stderr_fmt)
syslog.setFormatter(syslog_fmt)

# add the handlers to the log
log.addHandler(stderr)
log.addHandler(syslog)


def log_uncaught_exceptions(ex_cls, ex, tb):

    logging.critical(''.join(traceback.format_tb(tb)))
    logging.critical('{0}: {1}'.format(ex_cls, ex))


sys.excepthook = log_uncaught_exceptions


def DEBUG(msg):
    log.debug(msg)


def EXCEPTION(msg):
    log.exception(msg)


def ERROR(msg):
    log.error(msg)


def INFO(msg):
    log.info(msg)


if __name__ == "__main__":
    DEBUG("hi debug")
    ERROR("hi error")
    INFO("hi info")
    EXCEPTION("hi exception")

    def f():
        return g()

    def g():
        return h()

    def h():
        return i()

    def i():
        1 / 0

    f()