from __future__ import absolute_import

import datetime
import pytz

from django.core.management.base import BaseCommand
from zerver.models import UserProfile, Realm, Stream, Message

class Command(BaseCommand):
    help = "Generate statistics on user activity."

    def add_arguments(self, parser):
        parser.add_argument('realms', metavar='<realm>', type=str, nargs='*',
                            help="realm to generate statistics for")

    def messages_sent_by(self, user, week):
        start = datetime.datetime.now(tz=pytz.utc) - datetime.timedelta(days=(week + 1)*7)
        end = datetime.datetime.now(tz=pytz.utc) - datetime.timedelta(days=week*7)
        return Message.objects.filter(sender=user, pub_date__gt=start, pub_date__lte=end).count()

    def handle(self, *args, **options):
        if options['realms']:
            try:
                realms = [Realm.objects.get(domain=domain) for domain in options['realms']]
            except Realm.DoesNotExist, e:
                print e
                exit(1)
        else:
            realms = Realm.objects.all()

        for realm in realms:
            print realm.domain
            user_profiles = UserProfile.objects.filter(realm=realm, is_active=True)
            print "%d users" % (len(user_profiles),)
            print "%d streams" % (len(Stream.objects.filter(realm=realm)),)

            for user_profile in user_profiles:
                print "%35s" % (user_profile.email,),
                for week in range(10):
                    print "%5d" % (self.messages_sent_by(user_profile, week)),
                print ""
