feat: add booking REST API

backend/shows/views.py

@@ -0,0 +1,65 @@
+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)
+    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)
+    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)
+    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)
+    return Response(serializer.data)