from django.contrib.auth.models import User
from django.contrib.syndication.feeds import Feed
from django.core.urlresolvers import reverse
from django.db.models import Q
from django.utils.translation import ugettext as _

from helpdesk.models import Ticket, FollowUp, Queue


class OpenTicketsByUser(Feed):
    title_template = 'helpdesk/rss/ticket_title.html'
    description_template = 'helpdesk/rss/ticket_description.html'

    def get_object(self, bits):
        if len(bits) < 1:
            raise ObjectDoesNotExist
        user = User.objects.get(username__exact=bits[0])
        if len(bits) == 2:
            queue = Queue.objects.get(slug__exact=bits[1])
        else: queue = False

        return {'user': user, 'queue': queue}

    def title(self, obj):
        if obj['queue']:
            return _("Helpdesk: Open Tickets in queue %(queue)s for %(username)s") % {'queue': obj['queue'].title, 'username': obj['user'].username}
        else:
            return _("Helpdesk: Open Tickets for %(username)s") % {'username': obj['user'].username}

    def description(self, obj):
        if obj['queue']:
            return _("Open and Reopened Tickets in queue %(queue)s for %(username)s") % {'queue': obj['queue'].title, 'username': obj['user'].username}
        else:
            return _("Open and Reopened Tickets for %(username)s") % {'username': obj['user'].username}

    def link(self, obj):
        if obj['queue']:
            return u'%s?assigned_to=%s&queue=%s' % (reverse('helpdesk_list'), obj['user'].id, obj['queue'].id)
        else:
            return u'%s?assigned_to=%s' % (reverse('helpdesk_list'), obj['user'].id)

    def items(self, obj):
        if obj['queue']:
            return Ticket.objects.filter(assigned_to=obj['user']).filter(queue=obj['queue']).filter(Q(status=Ticket.OPEN_STATUS) | Q(status=Ticket.REOPENED_STATUS))
        else:
            return Ticket.objects.filter(assigned_to=obj['user']).filter(Q(status=Ticket.OPEN_STATUS) | Q(status=Ticket.REOPENED_STATUS))
    
    def item_pubdate(self, item):
        return item.created

    def item_author_name(self, item):
        if item.assigned_to:
            return item.assigned_to.username
        else:
            return _('Unassigned')


class UnassignedTickets(Feed):
    title_template = 'helpdesk/rss/ticket_title.html'
    description_template = 'helpdesk/rss/ticket_description.html'
    
    title = _('Helpdesk: Unassigned Tickets')
    description = _('Unassigned Open and Reopened tickets')
    link = ''#%s?assigned_to=' % reverse('helpdesk_list')

    def items(self, obj):
        return Ticket.objects.filter(assigned_to__isnull=True).filter(Q(status=Ticket.OPEN_STATUS) | Q(status=Ticket.REOPENED_STATUS))
    
    def item_pubdate(self, item):
        return item.created
    
    
    def item_author_name(self, item):
        if item.assigned_to:
            return item.assigned_to.username
        else:
            return _('Unassigned')


class RecentFollowUps(Feed):
    title_template = 'helpdesk/rss/recent_activity_title.html'
    description_template = 'helpdesk/rss/recent_activity_description.html'

    title = _('Helpdesk: Recent Followups')
    description = _('Recent FollowUps, such as e-mail replies, comments, attachments and resolutions')
    link = '/tickets/' # reverse('helpdesk_list')

    def items(self):
        return FollowUp.objects.order_by('-date')[:20]


class OpenTicketsByQueue(Feed):
    title_template = 'helpdesk/rss/ticket_title.html'
    description_template = 'helpdesk/rss/ticket_description.html'

    def get_object(self, bits):
        if len(bits) != 1:
            raise ObjectDoesNotExist
        return Queue.objects.get(slug__exact=bits[0])

    def title(self, obj):
        return _('Helpdesk: Open Tickets in queue %(queue)s') % {'queue': obj.title}

    def description(self, obj):
        return _('Open and Reopened Tickets in queue %(queue)s') % {'queue': obj.title}

    def link(self, obj):
        return '%s?queue=%s' % (reverse('helpdesk_list'), obj.id)

    def items(self, obj):
        return Ticket.objects.filter(queue=obj).filter(Q(status=Ticket.OPEN_STATUS) | Q(status=Ticket.REOPENED_STATUS))

    def item_pubdate(self, item):
        return item.created
    
    def item_author_name(self, item):
        if item.assigned_to:
            return item.assigned_to.username
        else:
            return _('Unassigned')


feed_setup = {
    'user': OpenTicketsByUser,
    'queue': OpenTicketsByQueue,
    'recent_activity': RecentFollowUps,
    'unassigned': UnassignedTickets,
}