from __future__ import absolute_import

from django.db import models
from sentry.db.models import (
    Model, BoundedIntegerField, BoundedBigIntegerField,
    BoundedPositiveIntegerField)
from sentry.testutils import TestCase


# There's a good chance this model wont get created in the db, so avoid
# assuming it exists in these tests.
class DummyModel(Model):
    foo = models.CharField(max_length=32)
    normint = BoundedIntegerField(null=True)
    bigint = BoundedBigIntegerField(null=True)
    posint = BoundedPositiveIntegerField(null=True)


class ModelTest(TestCase):
    def test_foo_hasnt_changed_on_init(self):
        inst = DummyModel(id=1, foo='bar')
        self.assertFalse(inst.has_changed('foo'))

    def test_foo_has_changes_before_save(self):
        inst = DummyModel(id=1, foo='bar')
        inst.foo = 'baz'
        self.assertTrue(inst.has_changed('foo'))
        self.assertEquals(inst.old_value('foo'), 'bar')

    def test_foo_hasnt_changed_after_save(self):
        inst = DummyModel(id=1, foo='bar')
        inst.foo = 'baz'
        self.assertTrue(inst.has_changed('foo'))
        self.assertEquals(inst.old_value('foo'), 'bar')
        models.signals.post_save.send(instance=inst, sender=type(inst), created=False)
        self.assertFalse(inst.has_changed('foo'))

    def test_large_int(self):
        with self.assertRaises(AssertionError):
            DummyModel.objects.create(normint=9223372036854775807L, foo='bar')

        with self.assertRaises(AssertionError):
            DummyModel.objects.create(bigint=9223372036854775808L, foo='bar')

        with self.assertRaises(AssertionError):
            DummyModel.objects.create(posint=9223372036854775808L, foo='bar')
