from rest_framework_guardian.serializers import ObjectPermissionsAssignmentMixin
from rest_framework import serializers, viewsets
from rest_framework_guardian import filters
from config.models import Stream, Restream


class StreamSerializer(ObjectPermissionsAssignmentMixin, serializers.ModelSerializer):
    class Meta:
        model = Stream
        fields = '__all__'
        read_only_fields = ['publish_counter']

    def get_permissions_map(self, created):
        current_user = self.context['request'].user
        return {
            'view_stream': [current_user],
            'change_stream': [current_user],
            'delete_stream': [current_user]
        }


class StreamViewSet(viewsets.ModelViewSet):
    queryset = Stream.objects.all()
    serializer_class = StreamSerializer
    filter_backends = [filters.ObjectPermissionsFilter]


class RestreamSerializer(ObjectPermissionsAssignmentMixin, serializers.ModelSerializer):
    class Meta:
        model = Restream
        fields = '__all__'

    def get_permissions_map(self, created):
        current_user = self.context['request'].user
        return {
            'view_restreamconfig': [current_user],
            'change_restreamconfig': [current_user],
            'delete_restreamconfig': [current_user]
        }

    def validate_stream(self, value):
        request = self.context['request']
        if not request.user.has_perm('config.view_stream', value):
            raise serializers.ValidationError('Access to stream is not authorized')
        return value


class RestreamViewSet(viewsets.ModelViewSet):
    queryset = Restream.objects.all()
    serializer_class = RestreamSerializer
    filter_backends = [filters.ObjectPermissionsFilter]