import datetime
import views
import logging
import settings

from xml.dom.minidom import parse, parseString

from forum.modules import ui, decorate
from forum.settings import SVN_REVISION
from django.contrib.auth.middleware import AuthenticationMiddleware
from django.core.exceptions import ObjectDoesNotExist
from django.utils.encoding import smart_str

# Trigger the update process
now = datetime.datetime.now()
if (now - settings.LATEST_UPDATE_DATETIME) > datetime.timedelta(days=1):
    pass

# Update the user messages
@decorate.result(AuthenticationMiddleware.process_request, needs_params=True)
def process_request(result, self, request):
    messages_dom = parseString(smart_str(settings.UPDATE_MESSAGES_XML.value))
    messages = messages_dom.getElementsByTagName('message')

    for message in messages:
        # Get the SVN Revision
        try:
            svn_revision = int(SVN_REVISION.replace('SVN-', ''))
        except ValueError:
            # Here we'll have to find another way of getting the SVN revision
            svn_revision = 0

        message_body = message.getElementsByTagName('body')[0].firstChild.nodeValue
        message_revision = int(message.getElementsByTagName('revision')[0].firstChild.nodeValue)

        # Add the message to the user messages set only if the Message Revision number is greater than the
        # current installation SVN Revision number and only if the current user is a super user.
        if message_revision >= svn_revision and request.user.is_superuser:
            # We do not want to repeat ourselves. If the message already exists in the message list, we're not going to
            # add it. That's why first of all we're going the check if it is there.
            try:
                # If the message doesn't exist in the RelatedManager ObjectsDoesNotExist is going to be raised.
                request.user.message_set.all().get(message=message_body)
            except ObjectDoesNotExist:
                # Let's create the message.
                request.user.message_set.create(message=message_body)
            except:
                pass
    return result