from django.views.generic import TemplateView, DetailView, View
from django.contrib.auth.mixins import LoginRequiredMixin
from django.shortcuts import get_object_or_404, render
from django.http import JsonResponse, HttpResponseRedirect
from django.urls import reverse

from .models import Event, Activity
from equipment.models import EquipmentAttribution


class Index(TemplateView):
    template_name = "event/index.html"


class EventCalendar(LoginRequiredMixin, DetailView):
    model = Event
    template_name = 'event/calendar.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        event = self.object
        context['activities'] = (Activity.objects.filter(event=event)
                                 .order_by('beginning').prefetch_related(
                                      'tags', 'places', 'staff', 'parent'))
        return context


class EventView(LoginRequiredMixin, DetailView):
    model = Event
    template_name = 'event/event.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        event = self.object
        context['activities'] = (Activity.objects.filter(event=event)
                                 .order_by('beginning').prefetch_related(
                                      'tags', 'places', 'staff', 'parent'))
        return context


class ActivityView(LoginRequiredMixin, DetailView):
    model = Activity
    template_name = 'event/activity.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        activity = self.object
        context['attributions'] = (EquipmentAttribution.objects
                                   .filter(activity=activity)
                                   .prefetch_related('equipment'))
        return context


class EnrolActivityView(LoginRequiredMixin, View):
    http_method_names = ['post']

    def post(self, request, pk, *args, **kwargs):
        activity = get_object_or_404(Activity, id=pk)
        action = request.POST.get("goal", None)
        success = True
        if action == "enrol":
            activity.staff.add(request.user)
        elif action == "unenrol":
            activity.staff.remove(request.user)
        else:
            success = False
        if "ajax" in request.GET:
            if request.GET["ajax"] == "json":
                enrols = activity.staff
                return JsonResponse({
                    "enrolled": enrols.filter(id=request.user.id).exists(),
                    "number": enrols.count(),
                })
            return render(request, "event/activity_summary.html",
                          {"activity": activity})
        return HttpResponseRedirect(reverse("event:activity", kwargs={"pk":pk}))