# -*- coding: iso-8859-1 -*-
#
# Copyright (C) 2003-2005 Edgewall Software
# Copyright (C) 2003-2005 Daniel Lundin <daniel@edgewall.com>
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.com/license.html.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://projects.edgewall.com/trac/.
#
# Author: Daniel Lundin <daniel@edgewall.com>

import sys

def logger_factory(logtype='syslog', logfile=None, level='WARNING',
                   logid='Trac'):
    try:
        import logging, logging.handlers
        logger = logging.getLogger(logid)
        logtype = logtype.lower()
        if logtype == 'file':
            hdlr = logging.FileHandler(logfile)
        elif logtype in ['winlog', 'eventlog', 'nteventlog']:
            # Requires win32 extensions
            hdlr = logging.handlers.NTEventLogHandler(logid,
                                                      logtype='Application')
        elif logtype in ['syslog', 'unix']:
            hdlr = logging.handlers.SysLogHandler('/dev/log')
        elif logtype in ['stderr']:
            hdlr = logging.StreamHandler(sys.stderr)
        else:
            raise ValueError

        format = 'Trac[%(module)s] %(levelname)s: %(message)s'
        if logtype == 'file':
            format = '%(asctime)s ' + format 
        datefmt = ''
        level = level.upper()
        if level in ['DEBUG', 'ALL']:
            logger.setLevel(logging.DEBUG)
            datefmt = '%X'
        elif level == 'INFO':
            logger.setLevel(logging.INFO)
        elif level == 'ERROR':
            logger.setLevel(logging.ERROR)
        elif level == 'CRITICAL':
            logger.setLevel(logging.CRITICAL)
        else:
            logger.setLevel(logging.WARNING)
        formatter = logging.Formatter(format,datefmt)
        hdlr.setFormatter(formatter)
        logger.addHandler(hdlr) 

    # Logging only supported in Python >= 2.3
    # Disable logging by using a generic 'black hole' class
    except (ImportError, ValueError):
        class DummyLogger:
            """The world's most fake logger."""
            def __noop(self, *args, **kwargs):
                pass
            debug = info = warning = error = critical = log = exception = __noop
            warn = fatal = __noop
            getEffectiveLevel = lambda self: 0
            isEnabledFor = lambda self, level: 0
        logger = DummyLogger()
    return logger