"""
django-helpdesk - A Django powered ticket tracker for small enterprise.

(c) Copyright 2008 Jutda. All Rights Reserved. See LICENSE for details.

views/public.py - All public facing views, eg non-staff (no authentication
                  required) views.
"""
from django.core.exceptions import ObjectDoesNotExist
from django.urls import reverse
from django.http import HttpResponseRedirect
from django.shortcuts import render
from django.utils.http import urlquote
from django.utils.translation import ugettext as _

from helpdesk import settings as helpdesk_settings
from helpdesk.decorators import protect_view, is_helpdesk_staff
from helpdesk.forms import PublicTicketForm
from helpdesk.lib import text_is_spam
from helpdesk.models import Ticket, Queue, UserSettings, KBCategory


@protect_view
def homepage(request):
    if not request.user.is_authenticated and helpdesk_settings.HELPDESK_REDIRECT_TO_LOGIN_BY_DEFAULT:
        return HttpResponseRedirect(reverse('login'))

    if is_helpdesk_staff(request.user) or \
            (request.user.is_authenticated and
             helpdesk_settings.HELPDESK_ALLOW_NON_STAFF_TICKET_UPDATE):
        try:
            if request.user.usersettings_helpdesk.settings.get('login_view_ticketlist', False):
                return HttpResponseRedirect(reverse('helpdesk:list'))
            else:
                return HttpResponseRedirect(reverse('helpdesk:dashboard'))
        except UserSettings.DoesNotExist:
            return HttpResponseRedirect(reverse('helpdesk:dashboard'))

    if request.method == 'POST':
        form = PublicTicketForm(request.POST, request.FILES)
        form.fields['queue'].choices = [('', '--------')] + [
            (q.id, q.title) for q in Queue.objects.filter(allow_public_submission=True)]
        if form.is_valid():
            if text_is_spam(form.cleaned_data['body'], request):
                # This submission is spam. Let's not save it.
                return render(request, template_name='helpdesk/public_spam.html')
            else:
                ticket = form.save()
                try:
                    return HttpResponseRedirect('%s?ticket=%s&email=%s' % (
                        reverse('helpdesk:public_view'),
                        ticket.ticket_for_url,
                        urlquote(ticket.submitter_email))
                    )
                except ValueError:
                    # if someone enters a non-int string for the ticket
                    return HttpResponseRedirect(reverse('helpdesk:home'))
    else:
        try:
            queue = Queue.objects.get(slug=request.GET.get('queue', None))
        except Queue.DoesNotExist:
            queue = None
        initial_data = {}
        if queue:
            initial_data['queue'] = queue.id

        if request.user.is_authenticated and request.user.email:
            initial_data['submitter_email'] = request.user.email

        form = PublicTicketForm(initial=initial_data)
        form.fields['queue'].choices = [('', '--------')] + [
            (q.id, q.title) for q in Queue.objects.filter(allow_public_submission=True)]

    knowledgebase_categories = KBCategory.objects.all()

    return render(request, 'helpdesk/public_homepage.html', {
        'form': form,
        'helpdesk_settings': helpdesk_settings,
        'kb_categories': knowledgebase_categories
    })


@protect_view
def view_ticket(request):
    ticket_req = request.GET.get('ticket', None)
    email = request.GET.get('email', None)

    if ticket_req and email:
        queue, ticket_id = Ticket.queue_and_id_from_query(ticket_req)
        try:
            ticket = Ticket.objects.get(id=ticket_id, submitter_email__iexact=email)
        except ObjectDoesNotExist:
            error_message = _('Invalid ticket ID or e-mail address. Please try again.')
        else:
            if is_helpdesk_staff(request.user):
                redirect_url = reverse('helpdesk:view', args=[ticket_id])
                if 'close' in request.GET:
                    redirect_url += '?close'
                return HttpResponseRedirect(redirect_url)

            if 'close' in request.GET and ticket.status == Ticket.RESOLVED_STATUS:
                from helpdesk.views.staff import update_ticket
                # Trick the update_ticket() view into thinking it's being called with
                # a valid POST.
                request.POST = {
                    'new_status': Ticket.CLOSED_STATUS,
                    'public': 1,
                    'title': ticket.title,
                    'comment': _('Submitter accepted resolution and closed ticket'),
                }
                if ticket.assigned_to:
                    request.POST['owner'] = ticket.assigned_to.id
                request.GET = {}

                return update_ticket(request, ticket_id, public=True)

            # redirect user back to this ticket if possible.
            redirect_url = ''
            if helpdesk_settings.HELPDESK_NAVIGATION_ENABLED:
                redirect_url = reverse('helpdesk:view', args=[ticket_id])

            return render(request, 'helpdesk/public_view_ticket.html', {
                'ticket': ticket,
                'helpdesk_settings': helpdesk_settings,
                'next': redirect_url,
            })
    elif ticket_req is None and email is None:
        error_message = None
    else:
        error_message = _('Missing ticket ID or e-mail address. Please try again.')

    return render(request, 'helpdesk/public_view_form.html', {
        'ticket': False,
        'email': email,
        'error_message': error_message,
        'helpdesk_settings': helpdesk_settings,
    })


def change_language(request):
    return_to = ''
    if 'return_to' in request.GET:
        return_to = request.GET['return_to']

    return render(request, 'helpdesk/public_change_language.html', {'next': return_to})