# Copyright (C) 2020 by Animath
# SPDX-License-Identifier: GPL-3.0-or-later

from io import BytesIO
from zipfile import ZipFile

from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.sites.models import Site
from django.core.exceptions import PermissionDenied
from django.core.mail import send_mail
from django.db import transaction
from django.http import Http404, HttpResponse
from django.shortcuts import redirect
from django.template.loader import render_to_string
from django.urls import reverse_lazy
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from django.views.generic import CreateView, DetailView, FormView, RedirectView, TemplateView, UpdateView
from django.views.generic.edit import FormMixin, ProcessFormView
from django_tables2 import SingleTableView
from magic import Magic
from registration.models import AdminRegistration, StudentRegistration
from tfjm.lists import get_sympa_client
from tfjm.matrix import Matrix
from tfjm.views import AdminMixin, VolunteerMixin

from .forms import JoinTeamForm, NoteForm, ParticipationForm, PassageForm, PoolForm, PoolTeamsForm, \
    RequestValidationForm, SolutionForm, SynthesisForm, TeamForm, TournamentForm, ValidateParticipationForm
from .models import Note, Participation, Passage, Pool, Solution, Synthesis, Team, Tournament
from .tables import NoteTable, ParticipationTable, PassageTable, PoolTable, TeamTable, TournamentTable


class CreateTeamView(LoginRequiredMixin, CreateView):
    """
    Display the page to create a team for new users.
    """

    model = Team
    form_class = TeamForm
    extra_context = dict(title=_("Create team"))
    template_name = "participation/create_team.html"

    def dispatch(self, request, *args, **kwargs):
        user = request.user
        if not user.is_authenticated:
            return super().handle_no_permission()
        registration = user.registration
        if not registration.participates:
            raise PermissionDenied(_("You don't participate, so you can't create a team."))
        elif registration.team:
            raise PermissionDenied(_("You are already in a team."))
        return super().dispatch(request, *args, **kwargs)

    @transaction.atomic
    def form_valid(self, form):
        """
        When a team is about to be created, the user automatically
        joins the team, a mailing list got created and the user is
        automatically subscribed to this mailing list, and finally
        a Matrix room is created and the user is invited in this room.
        """
        ret = super().form_valid(form)
        # The user joins the team
        user = self.request.user
        registration = user.registration
        registration.team = form.instance
        registration.save()

        # Subscribe the user mail address to the team mailing list
        get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
                                     f"{user.first_name} {user.last_name}")

        # Invite the user in the team Matrix room
        Matrix.invite(f"#equipe-{form.instance.trigram.lower()}:tfjm.org",
                      f"@{user.registration.matrix_username}:tfjm.org")
        return ret


class JoinTeamView(LoginRequiredMixin, FormView):
    """
    Participants can join a team with the access code of the team.
    """
    model = Team
    form_class = JoinTeamForm
    extra_context = dict(title=_("Join team"))
    template_name = "participation/create_team.html"

    def dispatch(self, request, *args, **kwargs):
        user = request.user
        if not user.is_authenticated:
            return super().handle_no_permission()
        registration = user.registration
        if not registration.participates:
            raise PermissionDenied(_("You don't participate, so you can't create a team."))
        elif registration.team:
            raise PermissionDenied(_("You are already in a team."))
        return super().dispatch(request, *args, **kwargs)

    @transaction.atomic
    def form_valid(self, form):
        """
        When a user joins a team, the user is automatically subscribed to
        the team mailing list,the user is invited in the team Matrix room.
        """
        self.object = form.instance
        ret = super().form_valid(form)

        # Join the team
        user = self.request.user
        registration = user.registration
        registration.team = form.instance
        registration.save()

        # Subscribe to the team mailing list
        get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
                                     f"{user.first_name} {user.last_name}")

        # Invite the user in the team Matrix room
        Matrix.invite(f"#equipe-{form.instance.trigram.lower()}:tfjm.org",
                      f"@{user.registration.matrix_username}:tfjm.org")
        return ret

    def get_success_url(self):
        return reverse_lazy("participation:team_detail", args=(self.object.pk,))


class TeamListView(AdminMixin, SingleTableView):
    """
    Display the whole list of teams
    """
    model = Team
    table_class = TeamTable
    ordering = ('trigram',)


class MyTeamDetailView(LoginRequiredMixin, RedirectView):
    """
    Redirect to the detail of the team in which the user is.
    """

    def get_redirect_url(self, *args, **kwargs):
        user = self.request.user
        registration = user.registration
        if registration.participates:
            if registration.team:
                return reverse_lazy("participation:team_detail", args=(registration.team_id,))
            raise PermissionDenied(_("You are not in a team."))
        raise PermissionDenied(_("You don't participate, so you don't have any team."))


class TeamDetailView(LoginRequiredMixin, FormMixin, ProcessFormView, DetailView):
    """
    Display the detail of a team.
    """
    model = Team

    def get(self, request, *args, **kwargs):
        user = request.user
        self.object = self.get_object()
        # Ensure that the user is an admin or a volunteer or a member of the team
        if user.registration.is_admin or user.registration.participates and \
                user.registration.team and user.registration.team.pk == kwargs["pk"] \
                or user.registration.is_volunteer \
                and self.object.participation.tournament in user.registration.interesting_tournaments:
            return super().get(request, *args, **kwargs)
        raise PermissionDenied

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        team = self.get_object()
        context["title"] = _("Detail of team {trigram}").format(trigram=self.object.trigram)
        context["request_validation_form"] = RequestValidationForm(self.request.POST or None)
        context["validation_form"] = ValidateParticipationForm(self.request.POST or None)
        # A team is complete when there are at least 4 members plus a coache that have sent their authorizations,
        # their health sheet, they confirmed their email address and under-18 people sent their parental authorization.
        context["can_validate"] = team.students.count() >= 4 and team.coaches.exists() and \
            all(r.email_confirmed for r in team.students.all()) and \
            all(r.photo_authorization for r in team.participants.all()) and \
            all(r.health_sheet for r in team.participants.all()) and \
            all(r.parental_authorization for r in team.students.all() if r.under_18)

        return context

    def get_form_class(self):
        if not self.request.POST:
            return RequestValidationForm
        elif self.request.POST["_form_type"] == "RequestValidationForm":
            return RequestValidationForm
        elif self.request.POST["_form_type"] == "ValidateParticipationForm":
            return ValidateParticipationForm

    def form_valid(self, form):
        self.object = self.get_object()
        if isinstance(form, RequestValidationForm):
            return self.handle_request_validation(form)
        elif isinstance(form, ValidateParticipationForm):
            return self.handle_validate_participation(form)

    def handle_request_validation(self, form):
        """
        A team requests to be validated
        """
        if not self.request.user.registration.participates:
            form.add_error(None, _("You don't participate, so you can't request the validation of the team."))
            return self.form_invalid(form)
        if self.object.participation.valid is not None:
            form.add_error(None, _("The validation of the team is already done or pending."))
            return self.form_invalid(form)
        if not self.get_context_data()["can_validate"]:
            form.add_error(None, _("The team can't be validated: missing email address confirmations, "
                                   "authorizations, people or the chosen problem is not set."))
            return self.form_invalid(form)

        self.object.participation.valid = False
        self.object.participation.save()

        for admin in AdminRegistration.objects.all():
            mail_context = dict(user=admin.user, team=self.object, domain=Site.objects.first().domain)
            mail_plain = render_to_string("participation/mails/request_validation.txt", mail_context)
            mail_html = render_to_string("participation/mails/request_validation.html", mail_context)
            admin.user.email_user("[TFJM²] Validation d'équipe", mail_plain, html_message=mail_html)
        return super().form_valid(form)

    def handle_validate_participation(self, form):
        """
        An admin validates the team (or not)
        """
        if not self.request.user.registration.is_admin:
            form.add_error(None, _("You are not an administrator."))
            return self.form_invalid(form)
        elif self.object.participation.valid is not False:
            form.add_error(None, _("This team has no pending validation."))
            return self.form_invalid(form)

        if "validate" in self.request.POST:
            self.object.participation.valid = True
            self.object.participation.save()
            mail_context = dict(team=self.object, message=form.cleaned_data["message"])
            mail_plain = render_to_string("participation/mails/team_validated.txt", mail_context)
            mail_html = render_to_string("participation/mails/team_validated.html", mail_context)
            send_mail("[TFJM²] Équipe validée", mail_plain, None, [self.object.email], html_message=mail_html)

            if self.object.participation.tournament.price == 0:
                for registration in self.object.participants.all():
                    registration.payment.type = "free"
                    registration.payment.valid = True
                    registration.payment.save()
            else:
                for coach in self.object.coaches.all():
                    coach.payment.type = "free"
                    coach.payment.valid = True
                    coach.payment.save()
        elif "invalidate" in self.request.POST:
            self.object.participation.valid = None
            self.object.participation.save()
            mail_context = dict(team=self.object, message=form.cleaned_data["message"])
            mail_plain = render_to_string("participation/mails/team_not_validated.txt", mail_context)
            mail_html = render_to_string("participation/mails/team_not_validated.html", mail_context)
            send_mail("[TFJM²] Équipe non validée", mail_plain, None, [self.object.email],
                      html_message=mail_html)
        else:
            form.add_error(None, _("You must specify if you validate the registration or not."))
            return self.form_invalid(form)
        return super().form_valid(form)

    def get_success_url(self):
        return self.request.path


class TeamUpdateView(LoginRequiredMixin, UpdateView):
    """
    Update the detail of a team
    """
    model = Team
    form_class = TeamForm
    template_name = "participation/update_team.html"

    def dispatch(self, request, *args, **kwargs):
        user = request.user
        if not user.is_authenticated:
            return super().handle_no_permission()
        if user.registration.is_admin or user.registration.participates and \
                user.registration.team and user.registration.team.pk == kwargs["pk"] \
                or user.registration.is_volunteer \
                and self.object.participation.tournament in user.registration.interesting_tournaments:
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["participation_form"] = ParticipationForm(data=self.request.POST or None,
                                                          instance=self.object.participation)
        context["title"] = _("Update team {trigram}").format(trigram=self.object.trigram)
        return context

    @transaction.atomic
    def form_valid(self, form):
        participation_form = ParticipationForm(data=self.request.POST or None, instance=self.object.participation)
        if not participation_form.is_valid():
            return self.form_invalid(form)

        participation_form.save()
        return super().form_valid(form)


class TeamAuthorizationsView(LoginRequiredMixin, DetailView):
    """
    Get as a ZIP archive all the authorizations that are sent
    """
    model = Team

    def dispatch(self, request, *args, **kwargs):
        user = request.user
        if not user.is_authenticated:
            return super().handle_no_permission()
        if user.registration.is_admin or user.registration.participates and user.registration.team.pk == kwargs["pk"] \
                or user.registration.is_volunteer \
                and self.object.participation.tournament in user.registration.interesting_tournaments:
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied

    def get(self, request, *args, **kwargs):
        team = self.get_object()
        output = BytesIO()
        zf = ZipFile(output, "w")
        for participant in team.participants.all():
            magic = Magic(mime=True)
            if participant.photo_authorization:
                mime_type = magic.from_file("media/" + participant.photo_authorization.name)
                ext = mime_type.split("/")[1].replace("jpeg", "jpg")
                zf.write("media/" + participant.photo_authorization.name,
                         _("Photo authorization of {participant}.{ext}").format(participant=str(participant), ext=ext))

            if isinstance(participant, StudentRegistration) and participant.parental_authorization:
                mime_type = magic.from_file("media/" + participant.parental_authorization.name)
                ext = mime_type.split("/")[1].replace("jpeg", "jpg")
                zf.write("media/" + participant.parental_authorization.name,
                         _("Parental authorization of {participant}.{ext}")
                         .format(participant=str(participant), ext=ext))

            if participant.health_sheet:
                mime_type = magic.from_file("media/" + participant.health_sheet.name)
                ext = mime_type.split("/")[1].replace("jpeg", "jpg")
                zf.write("media/" + participant.health_sheet.name,
                         _("Health sheet of {participant}.{ext}").format(participant=str(participant), ext=ext))
        zf.close()
        response = HttpResponse(content_type="application/zip")
        response["Content-Disposition"] = "attachment; filename=\"{filename}\"" \
            .format(filename=_("Photo authorizations of team {trigram}.zip").format(trigram=team.trigram))
        response.write(output.getvalue())
        return response


class TeamLeaveView(LoginRequiredMixin, TemplateView):
    """
    A team member leaves a team
    """
    template_name = "participation/team_leave.html"
    extra_context = dict(title=_("Leave team"))

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()
        if not request.user.registration.participates or not request.user.registration.team:
            raise PermissionDenied(_("You are not in a team."))
        if request.user.registration.team.participation.valid:
            raise PermissionDenied(_("The team is already validated or the validation is pending."))
        return super().dispatch(request, *args, **kwargs)

    @transaction.atomic()
    def post(self, request, *args, **kwargs):
        """
        When the team is left, the user is unsubscribed from the team mailing list
        and kicked from the team room.
        """
        team = request.user.registration.team
        request.user.registration.team = None
        request.user.registration.save()
        get_sympa_client().unsubscribe(request.user.email, f"equipe-{team.trigram.lower()}", False)
        Matrix.kick(f"#equipe-{team.trigram.lower()}:tfjm.org",
                    f"@{request.user.registration.matrix_username}:tfjm.org",
                    "Équipe quittée")
        if team.students.count() + team.coaches.count() == 0:
            team.delete()
        return redirect(reverse_lazy("index"))


class MyParticipationDetailView(LoginRequiredMixin, RedirectView):
    """
    Redirects to the detail view of the participation of the team.
    """
    def get_redirect_url(self, *args, **kwargs):
        user = self.request.user
        registration = user.registration
        if registration.participates:
            if registration.team:
                return reverse_lazy("participation:participation_detail", args=(registration.team.participation.id,))
            raise PermissionDenied(_("You are not in a team."))
        raise PermissionDenied(_("You don't participate, so you don't have any team."))


class ParticipationDetailView(LoginRequiredMixin, DetailView):
    """
    Display detail about the participation of a team, and manage the solution submission.
    """
    model = Participation

    def dispatch(self, request, *args, **kwargs):
        user = request.user
        if not user.is_authenticated:
            return super().handle_no_permission()
        if not self.get_object().valid:
            raise PermissionDenied(_("The team is not validated yet."))
        if user.registration.is_admin or user.registration.participates \
                and user.registration.team.participation \
                and user.registration.team.participation.pk == kwargs["pk"] \
                or user.registration.is_volunteer \
                and self.object.tournament in user.registration.interesting_tournaments:
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        context["title"] = lambda: _("Participation of team {trigram}").format(trigram=self.object.team.trigram)

        return context


class TournamentListView(SingleTableView):
    """
    Display the list of all tournaments.
    """
    model = Tournament
    table_class = TournamentTable


class TournamentCreateView(AdminMixin, CreateView):
    """
    Create a new tournament.
    """
    model = Tournament
    form_class = TournamentForm

    def get_success_url(self):
        return reverse_lazy("participation:tournament_detail", args=(self.object.pk,))


class TournamentUpdateView(VolunteerMixin, UpdateView):
    """
    Update tournament detail.
    """
    model = Tournament
    form_class = TournamentForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated or not self.request.user.registration.is_admin \
                and not (self.request.user.registration.is_volunteer
                         and self.request.user.registration.organized_tournaments.all()):
            return self.handle_no_permission()
        return super().dispatch(request, *args, **kwargs)


class TournamentDetailView(DetailView):
    """
    Display tournament detail.
    """
    model = Tournament

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["teams"] = ParticipationTable(self.object.participations.all())
        context["pools"] = PoolTable(self.object.pools.all())

        notes = dict()
        for participation in self.object.participations.all():
            note = sum(pool.average(participation)
                       for pool in self.object.pools.filter(participations=participation).all())
            if note:
                notes[participation] = note
        context["notes"] = sorted(notes.items(), key=lambda x: x[1], reverse=True)

        return context


class SolutionUploadView(LoginRequiredMixin, FormView):
    template_name = "participation/upload_solution.html"
    form_class = SolutionForm

    def dispatch(self, request, *args, **kwargs):
        qs = Participation.objects.filter(pk=self.kwargs["pk"])
        if not qs.exists():
            raise Http404
        self.participation = qs.get()
        if not self.request.user.is_authenticated or not self.request.user.registration.is_admin \
                and not (self.request.user.registration.participates
                         and self.request.user.registration.team == self.participation.team):
            return self.handle_no_permission()
        return super().dispatch(request, *args, **kwargs)

    def form_valid(self, form):
        """
        When a solution is submitted, it replaces a previous solution if existing,
        otherwise it creates a new solution.
        It is discriminating whenever the team is selected for the final tournament or not.
        """
        form_sol = form.instance
        sol_qs = Solution.objects.filter(participation=self.participation,
                                         problem=form_sol.problem,
                                         final_solution=self.participation.final)

        tournament = Tournament.final_tournament() if self.participation.final else self.participation.final
        if timezone.now() > tournament.solution_limit and sol_qs.exists():
            form.add_error(None, _("You can't upload a solution after the deadline."))
            return self.form_invalid(form)

        # Drop previous solution if existing
        for sol in sol_qs.all():
            sol.file.delete()
            sol.delete()
        form_sol.participation = self.participation
        form_sol.final = self.participation.final
        form_sol.save()
        return super().form_valid(form)

    def get_success_url(self):
        return reverse_lazy("participation:participation_detail", args=(self.participation.pk,))


class PoolCreateView(AdminMixin, CreateView):
    model = Pool
    form_class = PoolForm


class PoolDetailView(LoginRequiredMixin, DetailView):
    model = Pool

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()
        if request.user.registration.is_admin or request.user.registration.participates \
                and request.user.registration.team \
                and request.user.registration.team.participation in self.get_object().participations.all() \
                or request.user.registration.is_volunteer \
                and self.get_object().tournament in request.user.registration.interesting_tournaments:
            return super().dispatch(request, *args, **kwargs)
        return self.handle_no_permission()

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        context["passages"] = PassageTable(self.object.passages.all())

        notes = dict()
        for participation in self.object.participations.all():
            note = self.object.average(participation)
            if note:
                notes[participation] = note
        context["notes"] = sorted(notes.items(), key=lambda x: x[1], reverse=True)

        return context


class PoolUpdateView(VolunteerMixin, UpdateView):
    model = Pool
    form_class = PoolForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()
        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and (self.get_object().tournament in request.user.registration.organized_tournaments.all()
                     or request.user.registration in self.get_object().juries.all()):
            return super().dispatch(request, *args, **kwargs)
        return self.handle_no_permission()


class PoolUpdateTeamsView(VolunteerMixin, UpdateView):
    model = Pool
    form_class = PoolTeamsForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()
        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and (self.get_object().tournament in request.user.registration.organized_tournaments.all()
                     or request.user.registration in self.get_object().juries.all()):
            return super().dispatch(request, *args, **kwargs)
        return self.handle_no_permission()


class PassageCreateView(VolunteerMixin, CreateView):
    model = Passage
    form_class = PassageForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()

        qs = Pool.objects.filter(pk=self.kwargs["pk"])
        if not qs.exists():
            raise Http404
        self.pool = qs.get()

        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and (self.pool.tournament in request.user.registration.organized_tournaments.all()
                     or request.user.registration in self.pool.juries.all()):
            return super().dispatch(request, *args, **kwargs)

        return self.handle_no_permission()

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        form.instance.pool = self.pool
        fSynthesisorm.fields["defender"].queryset = self.pool.participations.all()
        form.fields["opponent"].queryset = self.pool.participations.all()
        form.fields["reporter"].queryset = self.pool.participations.all()
        return form


class PassageDetailView(LoginRequiredMixin, DetailView):
    model = Passage

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()
        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and (self.get_object().pool.tournament in request.user.registration.organized_tournaments.all()
                     or request.user.registration in self.get_object().pool.juries.all()) \
                or request.user.registration.participates and request.user.registration.team \
                and request.user.registration.team.participation in [self.get_object().defender,
                                                                     self.get_object().opponent,
                                                                     self.get_object().reporter]:
            return super().dispatch(request, *args, **kwargs)
        return self.handle_no_permission()

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        if self.request.user.registration in self.object.pool.juries.all():
            context["my_note"] = Note.objects.get(passage=self.object, jury=self.request.user.registration)
            context["notes"] = NoteTable([note for note in self.object.notes.all() if note])
        return context


class PassageUpdateView(VolunteerMixin, UpdateView):
    model = Passage
    form_class = PassageForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()

        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and (self.get_object().pool.tournament in request.user.registration.organized_tournaments.all()
                     or request.user.registration in self.get_object().pool.juries.all()):
            return super().dispatch(request, *args, **kwargs)

        return self.handle_no_permission()


class SynthesisUploadView(LoginRequiredMixin, FormView):
    template_name = "participation/upload_synthesis.html"
    form_class = SynthesisForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated or not request.user.registration.participates:
            return self.handle_no_permission()

        qs = Passage.objects.filter(pk=self.kwargs["pk"])
        if not qs.exists():
            raise Http404
        self.participation = self.request.user.registration.team.participation
        self.passage = qs.get()

        if self.participation not in [self.passage.defender, self.passage.opponent, self.passage.reporter]:
            return self.handle_no_permission()

        return super().dispatch(request, *args, **kwargs)

    def form_valid(self, form):
        """
        When a solution is submitted, it replaces a previous solution if existing,
        otherwise it creates a new solution.
        It is discriminating whenever the team is selected for the final tournament or not.
        """
        form_syn = form.instance
        syn_qs = Synthesis.objects.filter(participation=self.participation,
                                          passage=self.passage,
                                          type=form_syn.type).all()

        deadline = self.passage.pool.tournament.syntheses_first_phase_limit if self.passage.pool.round == 1 \
            else self.passage.pool.tournament.syntheses_second_phase_limit
        if syn_qs.exists() and timezone.now() > deadline:
            form.add_error(None, _("You can't upload a synthesis after the deadline."))
            return self.form_invalid(form)

        # Drop previous solution if existing
        for syn in syn_qs.all():
            syn.file.delete()
            syn.delete()
        form_syn.participation = self.participation
        form_syn.passage = self.passage
        form_syn.save()
        return super().form_valid(form)

    def get_success_url(self):
        return reverse_lazy("participation:passage_detail", args=(self.passage.pk,))


class NoteUpdateView(VolunteerMixin, UpdateView):
    model = Note
    form_class = NoteForm

    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_authenticated:
            return self.handle_no_permission()

        if request.user.registration.is_admin or request.user.registration.is_volunteer \
                and self.get_object().jury == request.user.registration:
            return super().dispatch(request, *args, **kwargs)

        return self.handle_no_permission()