from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.auth.models import AnonymousUser
from django.core.exceptions import PermissionDenied
from django.db.models import Q
from django.http import FileResponse
from django.shortcuts import redirect
from django.utils.translation import gettext_lazy as _
from django.views import View
from django.views.generic import CreateView, UpdateView, DetailView
from django_tables2 import SingleTableView

from tournament.models import Team
from tournament.views import AdminMixin, TeamMixin
from .forms import SignUpForm, TFJMUserForm
from .models import TFJMUser, Document, Solution, MotivationLetter, Synthesis
from .tables import UserTable


class CreateUserView(CreateView):
    model = TFJMUser
    form_class = SignUpForm
    template_name = "registration/signup.html"


class MyAccountView(LoginRequiredMixin, UpdateView):
    model = TFJMUser
    form_class = TFJMUserForm
    template_name = "member/my_account.html"

    def get_object(self, queryset=None):
        return self.request.user


class UserDetailView(LoginRequiredMixin, DetailView):
    model = TFJMUser
    form_class = TFJMUserForm
    context_object_name = "tfjmuser"

    def dispatch(self, request, *args, **kwargs):
        if isinstance(request.user, AnonymousUser):
            raise PermissionDenied

        self.object = self.get_object()

        if not request.user.admin \
                and (self.object.team is not None and request.user not in self.object.team.tournament.organizers.all())\
                and self.request.user != self.object:
            raise PermissionDenied
        return super().dispatch(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        if "view_as" in request.POST:
            session = request.session
            session["admin"] = request.user.pk
            obj = self.get_object()
            session["_fake_user_id"] = obj.pk
            return redirect(request.path)
        return self.get(request, *args, **kwargs)

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

        context["title"] = str(self.object)

        return context


class MyTeamView(TeamMixin, DetailView):
    model = Team

    def get_object(self, queryset=None):
        return self.request.user.team

    def dispatch(self, request, *args, **kwargs):
        if isinstance(request.user, AnonymousUser):
            raise PermissionDenied

        team = self.get_object()

        if not request.user.participates or team is None:
            raise PermissionDenied
        return super().dispatch(request, *args, **kwargs)

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

        context["title"] = str(self.object)

        return context


class DocumentView(LoginRequiredMixin, View):
    def get(self, request, *args, **kwargs):
        doc = Document.objects.get(file=self.kwargs["file"])

        grant = request.user.admin

        if isinstance(doc, Solution) or isinstance(doc, Synthesis) or isinstance(doc, MotivationLetter):
            grant = grant or doc.team == request.user.team or request.user in doc.team.tournament.organizers.all()

        if not grant:
            raise PermissionDenied

        return FileResponse(doc.file, content_type="application/pdf")


class ProfileListView(AdminMixin, SingleTableView):
    model = TFJMUser
    queryset = TFJMUser.objects.order_by("role", "last_name", "first_name")
    table_class = UserTable
    template_name = "member/profile_list.html"
    extra_context = dict(title=_("All profiles"))


class OrphanedProfileListView(AdminMixin, SingleTableView):
    model = TFJMUser
    queryset = TFJMUser.objects.filter((Q(role="2coach") | Q(role="3participant")) & Q(team__isnull=True))\
        .order_by("role", "last_name", "first_name")
    table_class = UserTable
    template_name = "member/profile_list.html"
    extra_context = dict(title=_("Orphaned profiles"))


class OrganizersListView(AdminMixin, SingleTableView):
    model = TFJMUser
    queryset = TFJMUser.objects.filter(Q(role="0admin") | Q(role="1volunteer"))\
        .order_by("role", "last_name", "first_name")
    table_class = UserTable
    template_name = "member/profile_list.html"
    extra_context = dict(title=_("Organizers"))


class ResetAdminView(AdminMixin, View):
    def dispatch(self, request, *args, **kwargs):
        if "_fake_user_id" in request.session:
            del request.session["_fake_user_id"]
        return redirect(request.GET["path"])