"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 21.01.22

"""
from abc import abstractmethod

from django.views import View


class AbstractModelAPIView(View):
    """ Base class for API views

    The API must follow the GeoJSON Specification RFC 7946
    https://geojson.org/
    https://datatracker.ietf.org/doc/html/rfc7946

    """
    model = None

    class Meta:
        abstract = True

    @abstractmethod
    def model_to_json(self, entry):
        """ Defines the returned json values of the model

        Args:
            entry (): The found entry from the database

        Returns:

        """
        raise NotImplementedError("Must be implemented in subclasses")

    def fetch_and_serialize(self, lookup_field, lookup_val):
        """ Serializes the model entry according to the given lookup data

        Args:
            lookup_field (): Which field used for lookup
            lookup_val (): Value for lookup

        Returns:
            serialized_data (dict)
        """
        _filters = {
            lookup_field: lookup_val
        }
        qs = self.model.objects.filter(**_filters)
        serialized_data = {}
        for entry in qs:
            serialized_data[str(entry.pk)] = self.model_to_json(entry)
        return serialized_data