import json
import django
from datetime import datetime, date
from django.conf import settings
from django.db.models import loading
from django.test import SimpleTestCase
from django.core.management import call_command
from django.core.exceptions import ValidationError

from .models import JSignatureTestModel


class JSignatureFieldsMixinTest(SimpleTestCase):

    def setUp(self):
        self.old_installed_apps = settings.INSTALLED_APPS
        settings.INSTALLED_APPS = list(settings.INSTALLED_APPS)
        settings.INSTALLED_APPS.append('jsignature.tests')
        loading.cache.loaded = False
        call_command('syncdb', verbosity=0)

    def tearDown(self):
        settings.INSTALLED_APPS = self.old_installed_apps

    def test_save(self):
        # If an object is created signed, signature date must be set
        signature_value = [{"x":[1,2], "y":[3,4]}]
        i = JSignatureTestModel(signature=signature_value)
        i.save()
        i = JSignatureTestModel.objects.get(pk=i.pk)
        self.assertEqual(date.today(), i.signature_date.date())

        # If signature doesn't change, signature date must not be updated
        i = JSignatureTestModel(signature=signature_value)
        i.save()
        i.signature_date = date(2013, 1, 1)
        i.signature = signature_value
        i.save()
        i = JSignatureTestModel.objects.get(pk=i.pk)
        self.assertEqual(date(2013, 1, 1), i.signature_date.date())

        # If signature changes, signature date must be updated too
        new_signature_value = [{"x":[5,6], "y":[7,8]}]
        i = JSignatureTestModel(signature=signature_value, signature_date=date(2013, 1, 1))
        i.save()
        i.signature_date = date(2013, 1, 1)
        i.signature = new_signature_value
        i.save()
        i = JSignatureTestModel.objects.get(pk=i.pk)
        self.assertEqual(date.today(), i.signature_date.date())