from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render, get_object_or_404
from django.urls import reverse

from .models import Event, EventRegistration


def index(request):
    events = Event.objects.order_by("-start_year")[:20]

    events_data = [
        {
            "event": event,
            "my_registration": event.registration_of(request.user),
        }
        for event in events
    ]
    return render(request, "events/index.html", {"events": events_data})


def register(request, event_id):
    if request.method != "POST":
        return HttpResponse(status_code=405)

    event = get_object_or_404(Event, id=event_id)

    event.eventregistration_set.create(
        event=event,
        user=request.user,
    )
    return HttpResponseRedirect(reverse("events:index") + f"#{event.id}")


def deregister(request, event_id):
    if request.method != "POST":
        return HttpResponse(status_code=405)

    registration = get_object_or_404(
        EventRegistration, event=event_id, user=request.user
    )
    registration.delete()
    return HttpResponseRedirect(reverse("events:index") + f"#{event_id}")