from rest_framework import serializers

from extras.models import CF_TYPE_SELECT, CustomFieldChoice, CustomFieldValue, Graph


# class CustomFieldSerializer(serializers.ModelSerializer):
#     """
#     Extends ModelSerializer to render any CustomFields and their values associated with an object.
#     """
#     custom_fields = serializers.SerializerMethodField()
#
#     def get_custom_fields(self, obj):
#
#         # Gather all CustomFields applicable to this object
#         fields = {cf.name: None for cf in self.context['custom_fields']}
#         custom_field_choices = self.context['custom_field_choices']
#
#         # Attach any defined CustomFieldValues to their respective CustomFields
#         for cfv in obj.custom_field_values.all():
#
#             # Attempt to suppress database lookups for CustomFieldChoices by using the cached choice set from the view
#             # context.
#             if cfv.field.type == CF_TYPE_SELECT:
#                 cfc = {
#                     'id': int(cfv.serialized_value),
#                     'value': custom_field_choices[int(cfv.serialized_value)]
#                 }
#                 fields[cfv.field.name] = CustomFieldChoiceSerializer(instance=cfc).data
#             else:
#                 fields[cfv.field.name] = cfv.value
#
#         return fields


class CustomFieldValueSerializer(serializers.ModelSerializer):

    class Meta:
        model = CustomFieldValue
        fields = ['field', 'serialized_value']


class CustomFieldChoiceSerializer(serializers.ModelSerializer):

    class Meta:
        model = CustomFieldChoice
        fields = ['id', 'value']


class GraphSerializer(serializers.ModelSerializer):
    embed_url = serializers.SerializerMethodField()
    embed_link = serializers.SerializerMethodField()

    class Meta:
        model = Graph
        fields = ['name', 'embed_url', 'embed_link']

    def get_embed_url(self, obj):
        return obj.embed_url(self.context['graphed_object'])

    def get_embed_link(self, obj):
        return obj.embed_link(self.context['graphed_object'])