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from datetime import timedelta
from math import floor

from django.apps import apps
from django.conf import settings
from django.contrib import messages
from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404, redirect
from django.urls import reverse_lazy
from django.utils.datetime_safe import datetime
from django.utils.translation import gettext_lazy as _
from django.views import View
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView, RedirectView, TemplateView
from AKModel.availability.models import Availability
from AKModel.models import AK, AKCategory, AKTag, AKOwner, AKSlot, AKTrack, AKOrgaMessage
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from AKModel.views import EventSlugMixin
from AKModel.views import FilterByEventSlugMixin
from AKSubmission.api import ak_interest_indication_active
from AKSubmission.forms import AKWishForm, AKOwnerForm, AKEditForm, AKSubmissionForm, AKDurationForm, AKOrgaMessageForm
class SubmissionErrorNotConfiguredView(EventSlugMixin, TemplateView):
    template_name = "AKSubmission/submission_not_configured.html"


class AKOverviewView(FilterByEventSlugMixin, ListView):
    model = AKCategory
    context_object_name = "categories"
    template_name = "AKSubmission/ak_overview.html"
    wishes_as_category = False

    def filter_aks(self, context, category):
        return category.ak_set.all()

    def get_active_category_name(self, context):
        return context["categories_with_aks"][0][0].name

    def get_table_title(self, context):
        return _("All AKs")
    def get(self, request, *args, **kwargs):
        self._load_event()
        self.object_list = self.get_queryset()

        # No categories yet? Redirect to configuration error page
        if self.object_list.count() == 0:
            return redirect(reverse_lazy("submit:error_not_configured", kwargs={'event_slug': self.event.slug}))

        context = self.get_context_data()
        return self.render_to_response(context)

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)

        # Sort AKs into different lists (by their category)
        ak_wishes = []
        categories_with_aks = []

        for category in context["categories"]:
            aks_for_category = []
            for ak in self.filter_aks(context, category):
                if self.wishes_as_category and ak.wish:
                    ak_wishes.append(ak)
                else:
                    aks_for_category.append(ak)
            categories_with_aks.append((category, aks_for_category))
        if self.wishes_as_category:
            categories_with_aks.append(
                (AKCategory(name=_("Wishes"), pk=0, description=_("AKs one would like to have")), ak_wishes))
        context["categories_with_aks"] = categories_with_aks
        context["active_category"] = self.get_active_category_name(context)
        context['table_title'] = self.get_table_title(context)

        # Display interest indication button?
        current_timestamp = datetime.now().astimezone(self.event.timezone)
        context['interest_indication_active'] = ak_interest_indication_active(self.event, current_timestamp)

        return context


class SubmissionOverviewView(AKOverviewView):
    model = AKCategory
    context_object_name = "categories"
    template_name = "AKSubmission/submission_overview.html"
    wishes_as_category = settings.WISHES_AS_CATEGORY

    def get_table_title(self, context):
        return _("Currently planned AKs")

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        # Get list of existing owners for event (for AK submission start)
        context["existingOwners"] = AKOwner.objects.filter(event=self.event)

        return context

class AKListByCategoryView(AKOverviewView):
    def dispatch(self, request, *args, **kwargs):
        self.category = get_object_or_404(AKCategory, pk=kwargs['category_pk'])
        return super().dispatch(request, *args, **kwargs)

    def get_active_category_name(self, context):
        return self.category.name


class AKListByTagView(AKOverviewView):
    def dispatch(self, request, *args, **kwargs):
        self.tag = get_object_or_404(AKTag, pk=kwargs['tag_pk'])
        return super().dispatch(request, *args, **kwargs)

    def filter_aks(self, context, category):
        return self.tag.ak_set.filter(event=self.event, category=category)

    def get_table_title(self, context):
        return f"{_('AKs with Tag')} = {self.tag.name}"


class AKListByTrackView(AKOverviewView):
    def dispatch(self, request, *args, **kwargs):
        self.track = get_object_or_404(AKTrack, pk=kwargs['track_pk'])
        return super().dispatch(request, *args, **kwargs)

    def filter_aks(self, context, category):
        return category.ak_set.filter(track=self.track)

    def get_table_title(self, context):
        return f"{_('AKs with Track')} = {self.track.name}"


class AKDetailView(EventSlugMixin, DetailView):
    model = AK
    context_object_name = "ak"
    template_name = "AKSubmission/ak_detail.html"

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context["availabilities"] = Availability.objects.filter(ak=context["ak"])
        current_timestamp = datetime.now().astimezone(self.event.timezone)

        # Is this AK taking place now or soon (used for top page visualization)
        context["featured_slot_type"] = "NONE"
        if apps.is_installed("AKPlan"):
            in_two_hours = current_timestamp + timedelta(hours=2)
            slots = context["ak"].akslot_set.filter(start__isnull=False, room__isnull=False)
            for slot in slots:
                if slot.end > current_timestamp:
                    if slot.start <= current_timestamp:
                        context["featured_slot_type"] = "CURRENT"
                        remaining = slot.end - current_timestamp
                    elif slot.start <= in_two_hours:
                        context["featured_slot_type"] = "UPCOMING"
                        remaining = slot.start - current_timestamp
                    else:
                        continue

                    context["featured_slot"] = slot
                    context["featured_slot_remaining"] = floor(remaining.days * 24 * 60 + remaining.seconds / 60)
                    break

        # Display interest indication button?
        context['interest_indication_active'] = ak_interest_indication_active(self.event, current_timestamp)

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class AKHistoryView(EventSlugMixin, DetailView):
    model = AK
    context_object_name = "ak"
    template_name = "AKSubmission/ak_history.html"


class AKListView(FilterByEventSlugMixin, ListView):
    model = AK
    context_object_name = "AKs"
    template_name = "AKSubmission/ak_overview.html"
    table_title = ""

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
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        context['categories'] = AKCategory.objects.filter(event=self.event)
        context['tracks'] = AKTrack.objects.filter(event=self.event)
class EventInactiveRedirectMixin:
    def get_error_message(self):
        return _("Event inactive. Cannot create or update.")

    def get(self, request, *args, **kwargs):
        s = super().get(request, *args, **kwargs)
        if not self.event.active:
            messages.add_message(self.request, messages.ERROR, self.get_error_message())
            return redirect(reverse_lazy('submit:submission_overview', kwargs={'event_slug': self.event.slug}))
        return s


class AKAndAKWishSubmissionView(EventSlugMixin, EventInactiveRedirectMixin, CreateView):
    model = AK
    template_name = 'AKSubmission/submit_new.html'

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("AK successfully created"))
        return reverse_lazy('submit:ak_detail', kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.pk})
        if not form.cleaned_data["event"].active:
            messages.add_message(self.request, messages.ERROR, self.get_error_message())
            return redirect(reverse_lazy('submit:submission_overview',
                                         kwargs={'event_slug': form.cleaned_data["event"].slug}))

        super_form_valid = super().form_valid(form)
        if form.cleaned_data["event"].base_url:
            self.object.link = form.cleaned_data["event"].base_url + form.cleaned_data["name"].replace(" ", "_")
        # Set tags (and generate them if necessary)
        for tag_name in form.cleaned_data["tag_names"]:
            tag, _ = AKTag.objects.get_or_create(name=tag_name)
            self.object.tags.add(tag)

        for duration in form.cleaned_data["durations"]:
            new_slot = AKSlot(ak=self.object, duration=duration, event=self.object.event)
            new_slot.save()
class AKSubmissionView(AKAndAKWishSubmissionView):
    def get_initial(self):
        initials = super(AKAndAKWishSubmissionView, self).get_initial()
        initials['owners'] = [AKOwner.get_by_slug(self.event, self.kwargs['owner_slug'])]
        return initials

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['owner'] = get_object_or_404(AKOwner, event=self.event, slug=self.kwargs['owner_slug'])
        return context


class AKWishSubmissionView(AKAndAKWishSubmissionView):
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    template_name = 'AKSubmission/submit_new_wish.html'
    form_class = AKWishForm
    def get_initial(self):
        initials = super(AKAndAKWishSubmissionView, self).get_initial()
        initials['event'] = self.event
        return initials

class AKEditView(EventSlugMixin, EventInactiveRedirectMixin, UpdateView):
    model = AK
    template_name = 'AKSubmission/ak_edit.html'
    form_class = AKEditForm

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("AK successfully updated"))
        return reverse_lazy('submit:ak_detail', kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.pk})

        if not form.cleaned_data["event"].active:
            messages.add_message(self.request, messages.ERROR, self.get_error_message())
            return redirect(reverse_lazy('submit:submission_overview',
                                         kwargs={'event_slug': form.cleaned_data["event"].slug}))

        super_form_valid = super().form_valid(form)

        # Detach existing tags
        self.object.tags.clear()

        # Set tags (and generate them if necessary)
        for tag_name in form.cleaned_data["tag_names"]:
            tag, _ = AKTag.objects.get_or_create(name=tag_name)
            self.object.tags.add(tag)

        return super_form_valid

class AKInterestView(RedirectView):
    permanent = False
    pattern_name = 'submit:ak_detail'

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    def get(self, request, *args, **kwargs):
        # Increase interest counter for given AK
        ak = get_object_or_404(AK, pk=kwargs['pk'])
        if ak.event.active:
            ak.increment_interest()
            messages.add_message(self.request, messages.SUCCESS, _("Interest saved"))
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        return super().get(request, *args, **kwargs)


# when the interest increase request comes from the AK overview page, redirect to that instead of the AK overview page
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class AKOverviewInterestView(AKInterestView):
    pattern_name = 'submit:submission_overview'

    def get_redirect_url(self, *args, **kwargs):
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        # No PK needed for overview page of all AKs
        del kwargs['pk']
        return super().get_redirect_url(*args, **kwargs)
class AKOwnerCreateView(EventSlugMixin, EventInactiveRedirectMixin, CreateView):
    model = AKOwner
    template_name = 'AKSubmission/akowner_create_update.html'
    form_class = AKOwnerForm

    def get_success_url(self):
        return reverse_lazy('submit:submit_ak',
                            kwargs={'event_slug': self.kwargs['event_slug'], 'owner_slug': self.object.slug})

    def get_initial(self):
        initials = super(AKOwnerCreateView, self).get_initial()
        initials['event'] = self.event
        return initials
    def form_valid(self, form):
        if not form.cleaned_data["event"].active:
            messages.add_message(self.request, messages.ERROR, self.get_error_message())
            return redirect(reverse_lazy('submit:submission_overview',
                                         kwargs={'event_slug': form.cleaned_data["event"].slug}))
        return super().form_valid(form)


class AKOwnerSelectDispatchView(EventSlugMixin, View):
    """
    This view only serves as redirect to prepopulate the owners field in submission create view
    """
    def post(self, request, *args, **kwargs):
        owner_id = request.POST["owner_id"]

        if owner_id == "-1":
            return HttpResponseRedirect(
                reverse_lazy('submit:akowner_create', kwargs={'event_slug': kwargs['event_slug']}))

        owner = get_object_or_404(AKOwner, pk=request.POST["owner_id"])
        return HttpResponseRedirect(
            reverse_lazy('submit:submit_ak', kwargs={'event_slug': kwargs['event_slug'], 'owner_slug': owner.slug}))


class AKOwnerEditView(FilterByEventSlugMixin, EventSlugMixin, UpdateView):
    model = AKOwner
    template_name = "AKSubmission/akowner_create_update.html"
    form_class = AKOwnerForm

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("Person Info successfully updated"))
        return reverse_lazy('submit:submission_overview', kwargs={'event_slug': self.kwargs['event_slug']})

    def form_valid(self, form):
        if not form.cleaned_data["event"].active:
            messages.add_message(self.request, messages.ERROR, self.get_error_message())
            return redirect(reverse_lazy('submit:submission_overview',
                                         kwargs={'event_slug': form.cleaned_data["event"].slug}))
        return super().form_valid(form)


class AKOwnerEditDispatchView(EventSlugMixin, View):
    """
    This view only serves as redirect choose the correct edit view
    """
    def post(self, request, *args, **kwargs):
        owner_id = request.POST["owner_id"]

        if owner_id == "-1":
            messages.add_message(self.request, messages.WARNING, _("No user selected"))
            return HttpResponseRedirect(
                reverse_lazy('submit:submission_overview', kwargs={'event_slug': kwargs['event_slug']}))

        owner = get_object_or_404(AKOwner, pk=request.POST["owner_id"])
        return HttpResponseRedirect(
            reverse_lazy('submit:akowner_edit', kwargs={'event_slug': kwargs['event_slug'], 'slug': owner.slug}))
class AKSlotAddView(EventSlugMixin, EventInactiveRedirectMixin, CreateView):
    model = AKSlot
    form_class = AKDurationForm
    template_name = "AKSubmission/akslot_add_update.html"

    def get_initial(self):
        initials = super(AKSlotAddView, self).get_initial()
        initials['event'] = self.event
        initials['ak'] = get_object_or_404(AK, pk=self.kwargs['pk'])
        return initials

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['ak'] = get_object_or_404(AK, pk=self.kwargs['pk'])
        return context

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("AK Slot successfully added"))
        return reverse_lazy('submit:ak_detail',
                            kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.ak.pk})
class AKSlotEditView(EventSlugMixin, EventInactiveRedirectMixin, UpdateView):
    model = AKSlot
    form_class = AKDurationForm
    template_name = "AKSubmission/akslot_add_update.html"

    def get(self, request, *args, **kwargs):
        akslot = get_object_or_404(AKSlot, pk=kwargs["pk"])
        if akslot.start is not None:
            messages.add_message(self.request, messages.WARNING,
                                 _("You cannot edit a slot that has already been scheduled"))
            return redirect('submit:ak_detail', event_slug=self.kwargs['event_slug'], pk=akslot.ak.pk)
        return super().get(request, *args, **kwargs)

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['ak'] = self.object.ak
        return context

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("AK Slot successfully updated"))
        return reverse_lazy('submit:ak_detail',
                            kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.ak.pk})
class AKSlotDeleteView(EventSlugMixin, EventInactiveRedirectMixin, DeleteView):
    model = AKSlot
    template_name = "AKSubmission/akslot_delete.html"

    def get(self, request, *args, **kwargs):
        akslot = get_object_or_404(AKSlot, pk=kwargs["pk"])
        if akslot.start is not None:
            messages.add_message(self.request, messages.WARNING,
                                 _("You cannot delete a slot that has already been scheduled"))
            return redirect('submit:ak_detail', event_slug=self.kwargs['event_slug'], pk=akslot.ak.pk)
        return super().get(request, *args, **kwargs)

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['ak'] = self.object.ak
        return context

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("AK Slot successfully deleted"))
        return reverse_lazy('submit:ak_detail',
                            kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.ak.pk})


class AKAddOrgaMessageView(EventSlugMixin, CreateView):
    model = AKOrgaMessage
    form_class = AKOrgaMessageForm
    template_name = "AKSubmission/akmessage_add.html"

    def get_initial(self):
        initials = super(AKAddOrgaMessageView, self).get_initial()
        initials['ak'] = get_object_or_404(AK, pk=self.kwargs['pk'])
        return initials

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['ak'] = get_object_or_404(AK, pk=self.kwargs['pk'])
        return context

    def get_success_url(self):
        messages.add_message(self.request, messages.SUCCESS, _("Message to organizers successfully saved"))
        return reverse_lazy('submit:ak_detail',
                            kwargs={'event_slug': self.kwargs['event_slug'], 'pk': self.object.ak.pk})