import logging
import sys
from django.core import mail

# Make sure a NullHandler is available
# This was added in Python 2.7/3.2
try:
    from logging import NullHandler
except ImportError:
    class NullHandler(logging.Handler):
        def emit(self, record):
            pass

# Make sure that dictConfig is available
# This was added in Python 2.7/3.2
try:
    from logging.config import dictConfig
except ImportError:
    from django.utils.dictconfig import dictConfig

getLogger = logging.getLogger

# Ensure the creation of the Django logger
# with a null handler. This ensures we don't get any
# 'No handlers could be found for logger "django"' messages
logger = getLogger('django')
if not logger.handlers:
    logger.addHandler(NullHandler())

class AdminEmailHandler(logging.Handler):
    def __init__(self, include_html=False):
        logging.Handler.__init__(self)
        self.include_html = include_html

    """An exception log handler that emails log entries to site admins.

    If the request is passed as the first argument to the log record,
    request data will be provided in the
    """
    def emit(self, record):
        import traceback
        from django.conf import settings
        from django.views.debug import ExceptionReporter

        try:
            request = record.request
            subject = '%s (%s IP): %s' % (
                record.levelname,
                (request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS and 'internal' or 'EXTERNAL'),
                record.msg
            )
            request_repr = repr(request)
        except:
            subject = '%s: %s' % (
                record.levelname,
                record.msg
            )

            request = None
            request_repr = "Request repr() unavailable"

        if record.exc_info:
            exc_info = record.exc_info
            stack_trace = '\n'.join(traceback.format_exception(*record.exc_info))
        else:
            exc_info = (None, record.msg, None)
            stack_trace = 'No stack trace available'

        message = "%s\n\n%s" % (stack_trace, request_repr)
        reporter = ExceptionReporter(request, is_email=True, *exc_info)
        html_message = self.include_html and reporter.get_traceback_html() or None
        mail.mail_admins(subject, message, fail_silently=True, html_message=html_message)