from django.shortcuts import get_object_or_404
from django.utils import timezone
from django.utils.dateparse import parse_datetime
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response

from .models import Performance, Show
from .serializers import (
    PublicPerformanceDetailSerializer,
    PublicPerformanceListSerializer,
    PublicShowDetailSerializer,
    PublicShowListSerializer,
)


def public_performance_queryset():
    return Performance.objects.select_related("show", "venue").filter(
        show__is_published=True,
        starts_at__gte=timezone.now(),
    )


@api_view(["GET"])
def show_list(request):
    shows = Show.objects.filter(is_published=True).order_by("title")
    serializer = PublicShowListSerializer(shows, many=True, context={"request": request})
    return Response({"results": serializer.data})


@api_view(["GET"])
def show_detail(request, slug):
    show = get_object_or_404(Show, slug=slug, is_published=True)
    show.public_performances = public_performance_queryset().filter(show=show)
    serializer = PublicShowDetailSerializer(show, context={"request": request})
    return Response(serializer.data)


@api_view(["GET"])
def performance_list(request):
    performances = public_performance_queryset()

    show_slug = request.query_params.get("show")
    if show_slug:
        performances = performances.filter(show__slug=show_slug)

    from_value = request.query_params.get("from")
    if from_value:
        starts_from = parse_datetime(from_value)
        if starts_from is None:
            return Response(
                {"from": ["Enter a valid ISO 8601 date/time."]},
                status=status.HTTP_400_BAD_REQUEST,
            )
        performances = performances.filter(starts_at__gte=starts_from)

    serializer = PublicPerformanceListSerializer(
        performances.order_by("starts_at"),
        many=True,
        context={"request": request},
    )
    return Response({"results": serializer.data})


@api_view(["GET"])
def performance_detail(request, pk):
    performance = get_object_or_404(public_performance_queryset(), pk=pk)
    serializer = PublicPerformanceDetailSerializer(performance, context={"request": request})
    return Response(serializer.data)