from rest_framework import serializers
from core.apps.evaluation.models import CertificateModel


class BaseCertificateSerializer(serializers.ModelSerializer):
    file_url = serializers.SerializerMethodField()

    class Meta:
        model = CertificateModel
        fields = [
            "id",
            "title",
            "file",
            "file_url",
        ]

    def get_file_url(self, obj):
        request = self.context.get("request")

        if obj.file:
            if request:
                return request.build_absolute_uri(obj.file.url)
            return obj.file.url

        return None