from cashonly.models import *
from django.conf import settings
from django.core.mail import send_mass_mail
from django.core.management.base import NoArgsCommand, CommandError
from django.template import Context
from django.template.loader import get_template
from django.utils import translation
from django.utils.dateformat import DateFormat
from django.utils.formats import get_format
from django.utils.translation import ugettext as _
import datetime

RANGE = 24
USERSETTINGS_URL = 'https://cypher/kasse/usersettings/'


class Command(NoArgsCommand):
    help = 'Sends out the daily digest to all users with transactions' + \
           'in the last %dh' % RANGE

    def handle_noargs(self, **options):
        translation.activate('de')

        tpl = get_template('cashonly/daily_digest.txt')

        messages = []
        for a in Account.objects.all():
            name = '%s %s' % (a.user.first_name, a.user.last_name)
            context = {'name': name,
                       'credit': a.credit,
                       'range': RANGE,
                       'url': USERSETTINGS_URL}

            transactions = Transaction.objects.filter(account=a) \
                .filter(timestamp__gte=(datetime.datetime.now() -
                        datetime.timedelta(hours=RANGE)))

            if transactions.count() > 0:
                lengths = {'timestamp': len(_('date')),
                           'description': len(_('subject')),
                           'amount': len(_('amount'))}

                sum = 0
                for t in transactions:
                    lengths['timestamp'] = \
                        max(lengths['timestamp'], len(DateFormat(t.timestamp)
                            .format(get_format('SHORT_DATETIME_FORMAT'))))
                    lengths['description'] = \
                        max(lengths['description'], len(t.description))
                    lengths['amount'] = \
                        max(lengths['amount'], len(str(t.amount)))
                    t.description = t.description.split('\n')

                    sum += t.amount

                lengths['sum'] = lengths['timestamp'] + \
                    lengths['description'] + lengths['amount']
                context['lengths'] = lengths
                context['tl'] = transactions
                context['sum'] = sum

                rcpts = ['%s <%s>' % (name, a.user.email)]

                messages.append(('%s%s' % (settings.EMAIL_SUBJECT_PREFIX,
                                 _('Account Statement')),
                                 tpl.render(Context(context)),
                                 settings.DEFAULT_FROM_EMAIL, rcpts))

        send_mass_mail(tuple(messages))