# backend/api/v1/schedule/views.py
"""
ViewSets для django-scheduler (чистый, проверенный код).
Параллельно работают со старым calendar_app.
"""

from rest_framework import viewsets
from rest_framework.permissions import IsAuthenticated
from rest_framework.renderers import JSONRenderer
from schedule.models import (
    Event,
    EventRelation,
    Occurrence,
    Rule,
)

from scheduling.services import (
    filter_events_for_user,
)

from ..permissions import (
    CanManageEventRelation,
    CanManageScheduleRule,
)
from ..serializers import (
    EventRelationSerializer,
    OccurrenceSerializer,
    RuleSerializer,
)
from .common import _admin_requested_all_scope


class ScheduleRuleViewSet(viewsets.ModelViewSet):
    """CRUD для django-scheduler Rule (rrule RFC 5545).

    Endpoints:
    - GET /api/v1/schedule/rules/ - список правил
    - POST /api/v1/schedule/rules/ - создать правило
    - GET /api/v1/schedule/rules/{id}/ - детали
    """

    queryset = Rule.objects.order_by("name", "id")
    serializer_class = RuleSerializer
    permission_classes = [CanManageScheduleRule]
    renderer_classes = [JSONRenderer]


class ScheduleOccurrenceViewSet(viewsets.ReadOnlyModelViewSet):
    """Просмотр Occurrence (материализованных вхождений).

    Read-only ViewSet (Occurrence создаются автоматически).
    """

    queryset = Occurrence.objects.select_related("event", "event__calendar")
    serializer_class = OccurrenceSerializer
    permission_classes = [IsAuthenticated]
    renderer_classes = [JSONRenderer]

    def get_queryset(self):
        """Фильтрация по событию."""
        qs = super().get_queryset()
        visible_event_ids = filter_events_for_user(
            Event.objects.all(),
            self.request.user,
            allow_admin_all=_admin_requested_all_scope(self.request),
        ).values_list("id", flat=True)
        qs = qs.filter(event_id__in=visible_event_ids)

        event_id = self.request.query_params.get("event")
        if event_id:
            qs = qs.filter(event_id=event_id)

        return qs.order_by("start")


class ScheduleEventRelationViewSet(viewsets.ModelViewSet):
    """CRUD для EventRelation (участники встреч).

    Endpoints:
    - GET /api/v1/schedule/relations/ - список участников
    - GET /api/v1/schedule/relations/?event=1 - участники события
    - POST /api/v1/schedule/relations/ - добавить участника
    - DELETE /api/v1/schedule/relations/{id}/ - удалить участника
    """

    queryset = EventRelation.objects.select_related("event", "content_type")
    serializer_class = EventRelationSerializer
    permission_classes = [CanManageEventRelation]
    renderer_classes = [JSONRenderer]

    def get_queryset(self):
        """Фильтрация по событию."""
        qs = super().get_queryset()
        visible_event_ids = filter_events_for_user(
            Event.objects.all(),
            self.request.user,
            allow_admin_all=_admin_requested_all_scope(self.request),
        ).values_list("id", flat=True)
        qs = qs.filter(event_id__in=visible_event_ids)

        event_id = self.request.query_params.get("event")
        if event_id:
            qs = qs.filter(event_id=event_id)

        return qs.order_by("id")