from django.db import models
from .fields import TranslatableMixin
from django.core.exceptions import ValidationError


class TranslatableModelMixin(models.Model):
    class Meta:
        abstract = True

    def clean(self):
        for field in self._meta.get_fields():
            if isinstance(field, TranslatableMixin) and field.translatable:
                if not isinstance(getattr(self, field.name), dict):
                    raise ValidationError(f'Field "{field.name}" must be a dictionary')
                if not any(getattr(self, field.name).values()):
                    raise ValidationError(f'Field "{field.name}" must contain at least one translation')
        super().clean()