from django.contrib.auth.models import Group, Permission, User
from django.contrib.contenttypes.models import ContentType
from django.core.management import call_command
from django.forms.models import modelform_factory
from django.test import TestCase, override_settings

from perfieldperms.forms import PFPModelForm, PFPPermFilterForm, PFPRoleFilterForm
from perfieldperms.models import PFPFilterType, PFPRoleType
from perfieldperms.utils import get_non_pfp_perms, get_unpermitted_fields
from . import helpers
from .models import Pizza


@override_settings(
        AUTHENTICATION_BACKENDS=['perfieldperms.backends.PFPBackend'],
        PFP_MODELS=[('tests', 'pizza')],
        PFP_IGNORE_PERMS={}
        )
class PFPModelFormTest(TestCase):

    @classmethod
    def setUpTestData(cls):
        call_command('pfp-makeperms')

    def setUp(self):
        pass

    def test_configure_form(self):
        """Test setting user/disable_attributes of form."""
        # Set attributes on class
        PizzaForm = modelform_factory(Pizza, form=PFPModelForm, fields='__all__')
        PizzaForm.disable_fields = False
        PizzaForm.disabled_fields = ['name']
        form = PizzaForm()
        self.assertEqual(['name'], form.disabled_fields)
        self.assertFalse(form.disable_fields)
        # Defaults get set
        PizzaForm = modelform_factory(Pizza, form=PFPModelForm, fields='__all__')
        form = PizzaForm()
        self.assertFalse(form.disabled_fields)
        self.assertTrue(form.disable_fields)
        # Set via args
        form = PizzaForm(disabled_fields=['name'], disable_fields=False)
        self.assertEqual(['name'], form.disabled_fields)
        self.assertFalse(form.disable_fields)
        # Set via passing in user merged with other config methods
        user1 = User.objects.create_user(username='user1', password='sekret')
        pfp = helpers.get_perm('tests', 'pizza', 'add_pizza__name')
        user1.user_permissions.add(pfp)
        form = PizzaForm(disabled_fields=['name'], user=user1)
        self.assertSetEqual({'name', 'price', 'toppings', 'bases'}, set(form.disabled_fields))
        self.assertTrue(form.disable_fields)

    def test_modify_fields(self):
        """Form fields are modified when appropriate."""
        PizzaForm = modelform_factory(Pizza, form=PFPModelForm, fields='__all__')
        user1 = User.objects.create_user(username='user1', password='supersekret')
        # Test disable fields
        pfp1 = helpers.get_perm('tests', 'pizza', 'add_pizza__name')
        pfp2 = helpers.get_perm('tests', 'pizza', 'add_pizza__price')
        user1.user_permissions.add(pfp1, pfp2)
        disabled_fields = get_unpermitted_fields(Pizza, user1)
        form = PizzaForm(disabled_fields=disabled_fields)
        self.assertFalse(form.fields['name'].disabled)
        self.assertFalse(form.fields['price'].disabled)
        self.assertTrue(form.fields['toppings'].disabled)
        self.assertTrue(form.fields['bases'].disabled)
        # Test delete fields
        form = PizzaForm(disabled_fields=disabled_fields, disable_fields=False)
        self.assertIn('name', form.fields)
        self.assertIn('price', form.fields)
        self.assertNotIn('toppings', form.fields)
        self.assertNotIn('bases', form.fields)
        # Form without all fields.
        PizzaForm = modelform_factory(Pizza, form=PFPModelForm, exclude=['toppings'])
        form = PizzaForm(disabled_fields=disabled_fields)
        self.assertNotIn('toppings', form.fields)
        self.assertFalse(form.fields['name'].disabled)
        self.assertFalse(form.fields['price'].disabled)
        self.assertTrue(form.fields['bases'].disabled)


class PFPRoleFilterFormTest(TestCase):

    def test_user_model(self):
        """Sets current user model if nothing else configured."""
        user_ctype = ContentType.objects.get_for_model(User)
        form = PFPRoleFilterForm()
        self.assertSetEqual(
                {user_ctype},
                set(form.fields['role_type'].queryset),
                )

    def test_added_roles(self):
        """Additional configured role types are added to queryset."""
        roles = []
        ctype = ContentType.objects.get_for_model(User)
        roles.append(ctype.id)
        PFPRoleType.objects.create(role_ctype=ctype)
        ctype = ContentType.objects.get_for_model(Group)
        roles.append(ctype.id)
        PFPRoleType.objects.create(role_ctype=ctype)
        form = PFPRoleFilterForm()
        self.assertSetEqual(
                set(ContentType.objects.filter(id__in=roles)),
                set(form.fields['role_type'].queryset),
                )
        self.assertEqual(
                len(ContentType.objects.filter(id__in=roles)),
                len(form.fields['role_type'].queryset),
                )


class PFPPermFilterFormTest(TestCase):
    def test_all_models(self):
        """All models are returned if no restrictions configured."""
        form = PFPPermFilterForm()
        self.assertSetEqual(
                set(ContentType.objects.all()),
                set(form.fields['model'].queryset)
                )

    def test_filtered_models(self):
        """Only filtered models returned if any are configured."""
        user_ctype = ContentType.objects.get_for_model(User)
        PFPFilterType.objects.create(filter_ctype=user_ctype)
        form = PFPPermFilterForm()
        self.assertEqual(
                set(ContentType.objects.filter(id=user_ctype.id)),
                set(form.fields['model'].queryset)
                )

    def test_initial_set(self):
        """Correct permission queryset initialised."""
        user_ctype = ContentType.objects.get_for_model(User)
        initial = {'model': user_ctype}
        form = PFPPermFilterForm(initial=initial)
        self.assertSetEqual(
                set(get_non_pfp_perms(user_ctype)),
                set(form.fields['permissions'].queryset)
                )

    def test_initial_set_show_pfps_false(self):
        """
        PFPs are NOT in the permissions queryset if not in selected filter
        settings.
        """
        user_ctype = ContentType.objects.get_for_model(User)
        helpers.create_pfp('auth', 'user', 'add_user', 'email')
        initial = {'model': user_ctype, 'show_pfps': False}
        form = PFPPermFilterForm(initial=initial)
        self.assertSetEqual(
                set(get_non_pfp_perms(user_ctype)),
                set(form.fields['permissions'].queryset)
                )

    def test_initial_set_with_pfps(self):
        """PFPs are in the permissions queryset if selected in the filter."""
        user_ctype = ContentType.objects.get_for_model(User)
        helpers.create_pfp('auth', 'user', 'add_user', 'email')
        initial = {'model': user_ctype, 'show_pfps': True}
        form = PFPPermFilterForm(initial=initial)
        self.assertSetEqual(
                set(Permission.objects.filter(content_type=user_ctype)),
                set(form.fields['permissions'].queryset)
                )