"""
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
try:
    # Django 2.0+
    from django.urls import reverse
except ImportError:
    # Django < 2
    from django.core.urlresolvers import reverse
from django.http import HttpResponseRedirect, HttpResponse
from django.shortcuts import render
from django.utils.http import urlquote
from django.utils.translation import ugettext as _
from django.conf import settings

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 = {}

        # add pre-defined data for public ticket
        if hasattr(settings, 'HELPDESK_PUBLIC_TICKET_QUEUE'):
            # get the requested queue; return an error if queue not found
            try:
                queue = Queue.objects.get(slug=settings.HELPDESK_PUBLIC_TICKET_QUEUE)
            except Queue.DoesNotExist:
                return HttpResponse(status=500)
        if hasattr(settings, 'HELPDESK_PUBLIC_TICKET_PRIORITY'):
            initial_data['priority'] = settings.HELPDESK_PUBLIC_TICKET_PRIORITY
        if hasattr(settings, 'HELPDESK_PUBLIC_TICKET_DUE_DATE'):
            initial_data['due_date'] = settings.HELPDESK_PUBLIC_TICKET_DUE_DATE

        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.')
        except ValueError:
            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})