from django import urls
from django.contrib.auth.decorators import login_required
from django.http import JsonResponse
from django.shortcuts import redirect, render

from home.models import EventOccurrence, EventPage

from .forms import SignUpForm


def signup(request):
    if request.method == "POST":
        form = SignUpForm(request.POST)
        if form.is_valid():
            user = form.signup(request, form.save())
            return redirect("profile")
    else:
        form = SignUpForm()

    return render(request, "signup.html", {"form": form})


@login_required
def profile(request):
    return render(request, "profile.html", {"user": request.user})


def calendar(request):
    return render(request, "calendar.html")


def occurrence_detail(request, occurrence_id):
    occ = (
        EventOccurrence.objects.select_related("event").filter(id=occurrence_id).first()
    )
    if not occ:
        return redirect("calendar")
    event = occ.event.specific
    return render(
        request,
        "occurrence_detail.html",
        {
            "occurrence": occ,
            "event": event,
            "user_signed_up": occ.user_signed_up(request.user),
        },
    )


def get_calendar_occurrences(request):
    # get occurrences from database (EventOccurrence model)
    start = request.GET.get("start")
    end = request.GET.get("end")
    occurrences = EventOccurrence.objects.filter(
        start__gte=start, end__lte=end
    ).select_related("event")

    events_list = []
    for occ in occurrences:
        event = occ.event.specific
        events_list.append(
            {
                "id": occ.id,
                "event_id": event.id,
                "title": event.title,
                "start": occ.start,
                "end": occ.end,
                "location": event.location,
                "url": event.url,
                "color": "#666666" if occ.is_past else event.color,
                "tags": list(event.tags.values_list("name", flat=True)),
            }
        )

    return JsonResponse(events_list, safe=False)


def get_calendar_occurrence(request, occurrence_id):
    occ = (
        EventOccurrence.objects.select_related("event").filter(id=occurrence_id).first()
    )
    if not occ:
        return JsonResponse({"error": "Occurrence not found"}, status=404)
    event = occ.event.specific
    event_dict = {
        "id": occ.id,
        "event_id": event.id,
        "title": event.title,
        "start": occ.start,
        "end": occ.end,
        "location": event.location,
        "url": event.url,
        "color": "#666666" if occ.is_past else event.color,
        "tags": list(event.tags.values_list("name", flat=True)),
        "attendees_count": occ.attendees_count,
    }
    return JsonResponse(event_dict)


def occurrence_signup(request, occurrence_id):
    if not request.user.is_authenticated:
        return redirect("login")

    occ = EventOccurrence.objects.filter(id=occurrence_id).first()
    if not occ:
        return redirect("calendar")

    occ.signed_up_users.add(request.user)
    occ.save()
    # redirect to calendar page with ?modal=occurrence_id to show modal with event details
    return redirect(urls.reverse("calendar") + f"?modal={occurrence_id}")


def occurrence_signout(request, occurrence_id):
    if not request.user.is_authenticated:
        return redirect("login")

    occ = EventOccurrence.objects.filter(id=occurrence_id).first()
    if not occ:
        return redirect("calendar")

    occ.signed_up_users.remove(request.user)
    occ.save()
    return redirect(urls.reverse("calendar") + f"?modal={occurrence_id}")