from django import forms
from django.core.exceptions import ValidationError
from django.test import TestCase

from .models import UUIDPK


class UUIDPKForm(forms.ModelForm):
    class Meta:
        model = UUIDPK
        fields = '__all__'


class ModelFormBaseTest(TestCase):
    def test_create_save_error(self):
        form = UUIDPKForm({})
        self.assertFalse(form.is_valid())
        msg = "The UUIDPK could not be created because the data didn't validate."
        with self.assertRaisesMessage(ValueError, msg):
            form.save()

    def test_update_save_error(self):
        obj = UUIDPK.objects.create(name='foo')
        form = UUIDPKForm({}, instance=obj)
        self.assertFalse(form.is_valid())
        msg = "The UUIDPK could not be changed because the data didn't validate."
        with self.assertRaisesMessage(ValueError, msg):
            form.save()

    def test_model_multiple_choice_field_uuid_pk(self):
        f = forms.ModelMultipleChoiceField(UUIDPK.objects.all())
        with self.assertRaisesMessage(ValidationError, "'invalid_uuid' is not a valid UUID."):
            f.clean(['invalid_uuid'])