from django.contrib.auth.mixins import LoginRequiredMixin
from django.core.exceptions import PermissionDenied
from django.db import transaction
from django.urls import reverse_lazy
from django.utils.translation import gettext_lazy as _
from django.views.generic import CreateView, DetailView, FormView, RedirectView, UpdateView

from .forms import JoinTeamForm, ParticipationForm, TeamForm
from .models import Team


class CreateTeamView(LoginRequiredMixin, CreateView):
    model = Team
    form_class = TeamForm
    extra_context = dict(title=_("Create team"))
    template_name = "participation/create_team.html"

    @transaction.atomic
    def form_valid(self, form):
        user = self.request.user
        registration = user.registration
        if not registration.participates:
            form.add_error(None, _("You don't participate, so you can't create a team."))
            return self.form_invalid(form)
        elif registration.team:
            form.add_error(None, _("You are already in a team."))
            return self.form_invalid(form)

        ret = super().form_valid(form)
        registration.team = form.instance
        registration.save()
        return ret

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


class JoinTeamView(LoginRequiredMixin, FormView):
    model = Team
    form_class = JoinTeamForm
    extra_context = dict(title=_("Join team"))
    template_name = "participation/create_team.html"

    @transaction.atomic
    def form_valid(self, form):
        user = self.request.user
        registration = user.registration
        if not registration.participates:
            form.add_error(None, _("You don't participate, so you can't create a team."))
            return self.form_invalid(form)
        elif registration.team:
            form.add_error(None, _("You are already in a team."))
            return self.form_invalid(form)

        self.object = form.instance
        ret = super().form_valid(form)
        registration.team = form.instance
        registration.save()
        return ret

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


class MyTeamDetailView(LoginRequiredMixin, RedirectView):
    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, DetailView):
    model = Team


class TeamUpdateView(LoginRequiredMixin, UpdateView):
    model = Team
    form_class = TeamForm
    template_name = "participation/update_team.html"

    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)
        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)

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