"""Policy API Views"""
from rest_framework.serializers import ModelSerializer, SerializerMethodField
from rest_framework.viewsets import ReadOnlyModelViewSet

from passbook.core.models import Policy
from passbook.policies.forms import GENERAL_FIELDS


class PolicySerializer(ModelSerializer):
    """Policy Serializer"""

    __type__ = SerializerMethodField(method_name='get_type')

    def get_type(self, obj):
        """Get object type so that we know which API Endpoint to use to get the full object"""
        return obj._meta.object_name.lower().replace('policy', '')

    class Meta:

        model = Policy
        fields = ['pk'] + GENERAL_FIELDS + ['__type__']


class PolicyViewSet(ReadOnlyModelViewSet):
    """Policy Viewset"""

    queryset = Policy.objects.all()
    serializer_class = PolicySerializer

    def get_queryset(self):
        return Policy.objects.select_subclasses()