from django.db import models
from backend.models.abstract.basic_module import BasicModule, BasicModuleSerializer, BasicModuleViewSet
from backend.models.university import University
from backend.models.currency import Currency
from django.core.validators import MinValueValidator
from backend.utils import get_model_config, get_viewset_permissions


class UniversityInfo(BasicModule):
    model_config = get_model_config("UniversityInfo")

    university = models.OneToOneField(
        University, on_delete=models.CASCADE, related_name='university_info', primary_key=True, null=False)

    cost_exchange = models.DecimalField(
        decimal_places=2,
        max_digits=20,
        validators=[MinValueValidator(0)],
        null=True
    )

    cost_double_degree = models.DecimalField(
        decimal_places=2,
        max_digits=20,
        validators=[MinValueValidator(0)],
        null=True
    )

    costs_currency = models.ForeignKey(Currency, on_delete=models.PROTECT)

    @classmethod
    def get_serializer(cls):
        return UniversityInfoSerializer


class UniversityInfoSerializer(BasicModuleSerializer):

    class Meta:
        model = UniversityInfo
        fields = '__all__'


class UniversityInfoViewSet(BasicModuleViewSet):
    permission_classes = get_viewset_permissions("UniversityInfoViewSet")
    queryset = UniversityInfo.objects.all()  # pylint: disable=E1101
    serializer_class = UniversityInfoSerializer