import csv

from django.conf import settings
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ObjectDoesNotExist
from django.db.models import ForeignKey
from django.test import override_settings
from django.urls import reverse
from django.utils.translation import gettext as _

from core.choices import ObjectChangeActionChoices
from core.models import ObjectChange, ObjectType
from netbox.choices import CSVDelimiterChoices, ImportFormatChoices
from netbox.models.features import ChangeLoggingMixin, CustomFieldsMixin
from users.models import ObjectPermission

from .base import ModelTestCase
from .utils import add_custom_field_data, disable_warnings, get_random_string, post_data

__all__ = (
    'ModelViewTestCase',
    'ViewTestCases',
)


#
# UI Tests
#

class ModelViewTestCase(ModelTestCase):
    """
    Base TestCase for model views. Subclass to test individual views.
    """
    def _get_base_url(self):
        """
        Return the base format for a URL for the test's model. Override this to test for a model which belongs
        to a different app (e.g. testing Interfaces within the virtualization app).
        """
        return '{}:{}_{{}}'.format(
            self.model._meta.app_label,
            self.model._meta.model_name
        )

    def _get_url(self, action, instance=None):
        """
        Return the URL name for a specific action and optionally a specific instance
        """
        url_format = self._get_base_url()

        # If no instance was provided, assume we don't need a unique identifier
        if instance is None:
            return reverse(url_format.format(action))

        return reverse(url_format.format(action), kwargs={'pk': instance.pk})


class ViewTestCases:
    """
    We keep any TestCases with test_* methods inside a class to prevent unittest from trying to run them.
    """
    class GetObjectViewTestCase(ModelViewTestCase):
        """
        Retrieve a single instance.
        """
        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], LOGIN_REQUIRED=False)
        def test_get_object_anonymous(self):
            # Make the request as an unauthenticated user
            self.client.logout()
            ct = ContentType.objects.get_for_model(self.model)
            if (ct.app_label, ct.model) in settings.EXEMPT_EXCLUDE_MODELS:
                # Models listed in EXEMPT_EXCLUDE_MODELS should not be accessible to anonymous users
                with disable_warnings('django.request'):
                    response = self.client.get(self._get_queryset().first().get_absolute_url())
                    self.assertHttpStatus(response, 302)
            else:
                response = self.client.get(self._get_queryset().first().get_absolute_url())
                self.assertHttpStatus(response, 200)

        def test_get_object_without_permission(self):
            instance = self._get_queryset().first()

            # Try GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(instance.get_absolute_url()), 403)

        def test_get_object_with_permission(self):
            instance = self._get_queryset().first()

            # Add model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['view']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission
            self.assertHttpStatus(self.client.get(instance.get_absolute_url()), 200)

        def test_get_object_with_constrained_permission(self):
            instance1, instance2 = self._get_queryset().all()[:2]

            # Add object-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': instance1.pk},
                actions=['view']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET to permitted object
            self.assertHttpStatus(self.client.get(instance1.get_absolute_url()), 200)

            # Try GET to non-permitted object
            self.assertHttpStatus(self.client.get(instance2.get_absolute_url()), 404)

    class GetObjectChangelogViewTestCase(ModelViewTestCase):
        """
        View the changelog for an instance.
        """
        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_get_object_changelog(self):
            url = self._get_url('changelog', self._get_queryset().first())
            response = self.client.get(url)
            self.assertHttpStatus(response, 200)

    class CreateObjectViewTestCase(ModelViewTestCase):
        """
        Create a single new instance.

        :form_data: Data to be used when creating a new object.
        """
        form_data = {}
        validation_excluded_fields = []

        def test_create_object_without_permission(self):

            # Try GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('add')), 403)

            # Try POST without permission
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.form_data),
            }
            response = self.client.post(**request)
            with disable_warnings('django.request'):
                self.assertHttpStatus(response, 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_create_object_with_permission(self):
            # Assign unconstrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['add']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission
            self.assertHttpStatus(self.client.get(self._get_url('add')), 200)

            # Add custom field data if the model supports it
            if issubclass(self.model, CustomFieldsMixin):
                add_custom_field_data(self.form_data, self.model)

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                if 'changelog_message' not in self.form_data:
                    self.form_data['changelog_message'] = get_random_string(10)

            # Try POST with model-level permission
            initial_count = self._get_queryset().count()
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            self.assertEqual(initial_count + 1, self._get_queryset().count())
            instance = self._get_queryset().order_by('pk').last()
            self.assertInstanceEqual(instance, self.form_data, exclude=self.validation_excluded_fields)

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(instance),
                    changed_object_id=instance.pk
                )
                self.assertEqual(len(objectchanges), 1)
                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_CREATE)
                self.assertEqual(objectchanges[0].message, self.form_data['changelog_message'])

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_create_object_with_constrained_permission(self):

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': 0},  # Dummy permission to deny all
                actions=['add']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with object-level permission
            self.assertHttpStatus(self.client.get(self._get_url('add')), 200)

            # Try to create an object (not permitted)
            initial_count = self._get_queryset().count()
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 200)
            self.assertEqual(initial_count, self._get_queryset().count())  # Check that no object was created

            # Update the ObjectPermission to allow creation
            obj_perm.constraints = {'pk__gt': 0}
            obj_perm.save()

            # Try to create an object (permitted)
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            self.assertEqual(initial_count + 1, self._get_queryset().count())
            instance = self._get_queryset().order_by('pk').last()
            self.assertInstanceEqual(instance, self.form_data, exclude=self.validation_excluded_fields)

    class EditObjectViewTestCase(ModelViewTestCase):
        """
        Edit a single existing instance.

        :form_data: Data to be used when updating the first existing object.
        """
        form_data = {}
        validation_excluded_fields = []

        def test_edit_object_without_permission(self):
            instance = self._get_queryset().first()

            # Try GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('edit', instance)), 403)

            # Try POST without permission
            request = {
                'path': self._get_url('edit', instance),
                'data': post_data(self.form_data),
            }
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(**request), 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_edit_object_with_permission(self):
            instance = self._get_queryset().first()

            # Assign model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission
            self.assertHttpStatus(self.client.get(self._get_url('edit', instance)), 200)

            # Add custom field data if the model supports it
            if issubclass(self.model, CustomFieldsMixin):
                add_custom_field_data(self.form_data, self.model)

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                if 'changelog_message' not in self.form_data:
                    self.form_data['changelog_message'] = get_random_string(10)

            # Try POST with model-level permission
            request = {
                'path': self._get_url('edit', instance),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            instance = self._get_queryset().get(pk=instance.pk)
            self.assertInstanceEqual(instance, self.form_data, exclude=self.validation_excluded_fields)

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(instance),
                    changed_object_id=instance.pk
                )
                self.assertEqual(len(objectchanges), 1)
                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_UPDATE)
                self.assertEqual(objectchanges[0].message, self.form_data['changelog_message'])

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_edit_object_with_constrained_permission(self):
            instance1, instance2 = self._get_queryset().all()[:2]

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': instance1.pk},
                actions=['change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with a permitted object
            self.assertHttpStatus(self.client.get(self._get_url('edit', instance1)), 200)

            # Try GET with a non-permitted object
            self.assertHttpStatus(self.client.get(self._get_url('edit', instance2)), 404)

            # Try to edit a permitted object
            request = {
                'path': self._get_url('edit', instance1),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            instance = self._get_queryset().get(pk=instance1.pk)
            self.assertInstanceEqual(instance, self.form_data, exclude=self.validation_excluded_fields)

            # Try to edit a non-permitted object
            request = {
                'path': self._get_url('edit', instance2),
                'data': post_data(self.form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 404)

    class DeleteObjectViewTestCase(ModelViewTestCase):
        """
        Delete a single instance.
        """
        def test_delete_object_without_permission(self):
            instance = self._get_queryset().first()

            # Try GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('delete', instance)), 403)

            # Try POST without permission
            request = {
                'path': self._get_url('delete', instance),
                'data': post_data({'confirm': True}),
            }
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(**request), 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_delete_object_with_permission(self):
            instance = self._get_queryset().first()
            form_data = {'confirm': True}

            # Assign model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['delete']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission
            self.assertHttpStatus(self.client.get(self._get_url('delete', instance)), 200)

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                form_data['changelog_message'] = get_random_string(10)

            # Try POST with model-level permission
            request = {
                'path': self._get_url('delete', instance),
                'data': post_data(form_data),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            with self.assertRaises(ObjectDoesNotExist):
                self._get_queryset().get(pk=instance.pk)

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(instance),
                    changed_object_id=instance.pk
                )
                self.assertEqual(len(objectchanges), 1)
                self.assertEqual(objectchanges[0].action, ObjectChangeActionChoices.ACTION_DELETE)
                self.assertEqual(objectchanges[0].message, form_data['changelog_message'])

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_delete_object_with_constrained_permission(self):
            instance1, instance2 = self._get_queryset().all()[:2]

            # Assign object-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': instance1.pk},
                actions=['delete']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with a permitted object
            self.assertHttpStatus(self.client.get(self._get_url('delete', instance1)), 200)

            # Try GET with a non-permitted object
            self.assertHttpStatus(self.client.get(self._get_url('delete', instance2)), 404)

            # Try to delete a permitted object
            request = {
                'path': self._get_url('delete', instance1),
                'data': post_data({'confirm': True}),
            }
            self.assertHttpStatus(self.client.post(**request), 302)
            with self.assertRaises(ObjectDoesNotExist):
                self._get_queryset().get(pk=instance1.pk)

            # Try to delete a non-permitted object
            request = {
                'path': self._get_url('delete', instance2),
                'data': post_data({'confirm': True}),
            }
            self.assertHttpStatus(self.client.post(**request), 404)
            self.assertTrue(self._get_queryset().filter(pk=instance2.pk).exists())

    class ListObjectsViewTestCase(ModelViewTestCase):
        """
        Retrieve multiple instances.
        """
        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], LOGIN_REQUIRED=False)
        def test_list_objects_anonymous(self):
            # Make the request as an unauthenticated user
            self.client.logout()
            ct = ContentType.objects.get_for_model(self.model)
            if (ct.app_label, ct.model) in settings.EXEMPT_EXCLUDE_MODELS:
                # Models listed in EXEMPT_EXCLUDE_MODELS should not be accessible to anonymous users
                with disable_warnings('django.request'):
                    response = self.client.get(self._get_url('list'))
                    self.assertHttpStatus(response, 302)
            else:
                response = self.client.get(self._get_url('list'))
                self.assertHttpStatus(response, 200)

        def test_list_objects_without_permission(self):

            # Try GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('list')), 403)

        def test_list_objects_with_permission(self):

            # Add model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['view']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission
            self.assertHttpStatus(self.client.get(self._get_url('list')), 200)

        def test_list_objects_with_constrained_permission(self):
            instance1, instance2 = self._get_queryset().all()[:2]

            # Add object-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': instance1.pk},
                actions=['view']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with object-level permission
            response = self.client.get(self._get_url('list'))
            self.assertHttpStatus(response, 200)
            content = str(response.content)
            self.assertIn(instance1.get_absolute_url(), content)
            self.assertNotIn(instance2.get_absolute_url(), content)

        def test_export_objects(self):
            url = self._get_url('list')

            # Add model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['view']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Test default CSV export
            response = self.client.get(f'{url}?export')
            self.assertHttpStatus(response, 200)
            self.assertEqual(response.get('Content-Type'), 'text/csv; charset=utf-8')

            # Test table-based export
            response = self.client.get(f'{url}?export=table')
            self.assertHttpStatus(response, 200)
            self.assertEqual(response.get('Content-Type'), 'text/csv; charset=utf-8')

    class CreateMultipleObjectsViewTestCase(ModelViewTestCase):
        """
        Create multiple instances using a single form. Expects the creation of three new instances by default.

        :bulk_create_count: The number of objects expected to be created (default: 3).
        :bulk_create_data: A dictionary of data to be used for bulk object creation.
        """
        bulk_create_count = 3
        bulk_create_data = {}
        validation_excluded_fields = []

        def test_create_multiple_objects_without_permission(self):
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.bulk_create_data),
            }

            # Try POST without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(**request), 403)

        def test_create_multiple_objects_with_permission(self):
            initial_count = self._get_queryset().count()
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.bulk_create_data),
            }

            # Assign non-constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['add'],
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Bulk create objects
            response = self.client.post(**request)
            self.assertHttpStatus(response, 302)
            self.assertEqual(initial_count + self.bulk_create_count, self._get_queryset().count())
            for instance in self._get_queryset().order_by('-pk')[:self.bulk_create_count]:
                self.assertInstanceEqual(instance, self.bulk_create_data, exclude=self.validation_excluded_fields)

        def test_create_multiple_objects_with_constrained_permission(self):
            initial_count = self._get_queryset().count()
            request = {
                'path': self._get_url('add'),
                'data': post_data(self.bulk_create_data),
            }

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['add'],
                constraints={'pk': 0}  # Dummy constraint to deny all
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Attempt to make the request with unmet constraints
            self.assertHttpStatus(self.client.post(**request), 200)
            self.assertEqual(self._get_queryset().count(), initial_count)

            # Update the ObjectPermission to allow creation
            obj_perm.constraints = {'pk__gt': 0}  # Dummy constraint to allow all
            obj_perm.save()

            response = self.client.post(**request)
            self.assertHttpStatus(response, 302)
            self.assertEqual(initial_count + self.bulk_create_count, self._get_queryset().count())
            for instance in self._get_queryset().order_by('-pk')[: self.bulk_create_count]:
                self.assertInstanceEqual(instance, self.bulk_create_data, exclude=self.validation_excluded_fields)

    class BulkImportObjectsViewTestCase(ModelViewTestCase):
        """
        Create multiple instances from imported data.

        :csv_data: CSV data for bulk import testing. Supports two formats:

            1. Tuple/list format (backwards compatible):
                csv_data = (
                    "name,slug,description",
                    "Object 1,object-1,First object",
                    "Object 2,object-2,Second object",
                )

            2. Dictionary format for multiple scenarios:
                csv_data = {
                    'default': (
                        "name,slug,description",
                        "Object 1,object-1,First object",
                    ),
                    'with_optional_fields': (
                        "name,slug,description,comments",
                        "Object 2,object-2,Second object,With comments",
                    )
                }

            When using dictionary format, test_bulk_import_objects_with_permission()
            runs each scenario as a separate subtest with clear output:

                test_bulk_import_objects_with_permission (scenario=default) ... ok
                test_bulk_import_objects_with_permission (scenario=with_optional_fields) ... ok
        """

        csv_data = ()

        def get_scenarios(self):
            return self.csv_data.keys() if isinstance(self.csv_data, dict) else ['default']

        def _get_csv_data(self, scenario_name='default'):
            """
            Get CSV data for testing. Supports both tuple/list and dictionary formats.
            """
            if isinstance(self.csv_data, dict):
                if scenario_name not in self.csv_data:
                    available = ', '.join(self.csv_data.keys())
                    raise ValueError(f"Scenario '{scenario_name}' not found in csv_data. Available: {available}")
                return '\n'.join(self.csv_data[scenario_name])
            if isinstance(self.csv_data, (tuple, list)):
                return '\n'.join(self.csv_data)
            raise TypeError(f'csv_data must be a tuple, list, or dictionary, got {type(self.csv_data)}')

        def _get_update_csv_data(self):
            return self.csv_update_data, '\n'.join(self.csv_update_data)

        def test_bulk_import_objects_without_permission(self):
            data = {
                'data': self._get_csv_data(),
                'format': ImportFormatChoices.CSV,
                'csv_delimiter': CSVDelimiterChoices.AUTO,
            }

            # Test GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('bulk_import')), 403)

            # Try POST without permission
            response = self.client.post(self._get_url('bulk_import'), data)
            with disable_warnings('django.request'):
                self.assertHttpStatus(response, 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_bulk_import_objects_with_permission(self, post_import_callback=None):
            # Assign model-level permission once for all scenarios
            obj_perm = ObjectPermission(name='Test permission', actions=['add'])
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try GET with model-level permission (only once)
            self.assertHttpStatus(self.client.get(self._get_url('bulk_import')), 200)

            # Test each scenario
            for scenario_name in self.get_scenarios():
                with self.cleanupSubTest(scenario=scenario_name):
                    self._test_bulk_import_with_permission_scenario(scenario_name)

                    if post_import_callback:
                        post_import_callback(scenario_name)

        def _test_bulk_import_with_permission_scenario(self, scenario_name):
            """
            Helper method to test a single bulk import scenario.
            """
            initial_count = self._get_queryset().count()

            # Get CSV data for this scenario
            scenario_data = self._get_csv_data(scenario_name)
            expected_new_objects = len(scenario_data.splitlines()) - 1

            data = {
                'data': scenario_data,
                'format': ImportFormatChoices.CSV,
                'csv_delimiter': CSVDelimiterChoices.AUTO,
            }

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                data['changelog_message'] = get_random_string(10)

            # Test POST with permission
            response = self.client.post(self._get_url('bulk_import'), data)
            self.assertHttpStatus(response, 302)

            # Verify object count increase
            self.assertEqual(self._get_queryset().count(), initial_count + expected_new_objects)

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                request_id = response.headers.get('X-Request-ID')
                self.assertIsNotNone(request_id, 'Unable to determine request ID from response')
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(self.model),
                    request_id=request_id,
                    action=ObjectChangeActionChoices.ACTION_CREATE,
                )
                self.assertEqual(len(objectchanges), expected_new_objects)

                for oc in objectchanges:
                    self.assertEqual(oc.message, data['changelog_message'])

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_bulk_update_objects_with_permission(self):
            if not hasattr(self, 'csv_update_data'):
                raise NotImplementedError(_("The test must define csv_update_data."))

            initial_count = self._get_queryset().count()
            array, csv_data = self._get_update_csv_data()
            data = {
                'format': ImportFormatChoices.CSV,
                'data': csv_data,
                'csv_delimiter': CSVDelimiterChoices.AUTO,
            }

            # Assign model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['add']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Test POST with permission
            self.assertHttpStatus(self.client.post(self._get_url('bulk_import'), data), 302)
            self.assertEqual(initial_count, self._get_queryset().count())

            reader = csv.DictReader(array, delimiter=',')
            check_data = list(reader)
            for line in check_data:
                obj = self.model.objects.get(id=line["id"])
                for attr, value in line.items():
                    if attr != "id":
                        field = self.model._meta.get_field(attr)
                        value = getattr(obj, attr)
                        # cannot verify FK fields as don't know what name the CSV maps to
                        if value is not None and not isinstance(field, ForeignKey):
                            self.assertEqual(value, value)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_bulk_import_objects_with_constrained_permission(self, post_import_callback=None):
            # Assign constrained permission (deny all initially)
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': 0},  # Dummy permission to deny all
                actions=['add'],
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Test each scenario with constrained permissions
            for scenario_name in self.get_scenarios():
                with self.cleanupSubTest(scenario=scenario_name):
                    self._test_bulk_import_constrained_scenario(scenario_name, obj_perm)

                    if post_import_callback:
                        post_import_callback(scenario_name)

        def _test_bulk_import_constrained_scenario(self, scenario_name, obj_perm):
            """
            Helper method to test a single bulk import scenario with constrained permissions.
            """
            initial_count = self._get_queryset().count()

            # Get CSV data for this scenario
            scenario_data = self._get_csv_data(scenario_name)
            expected_new_objects = len(scenario_data.splitlines()) - 1

            data = {
                'data': scenario_data,
                'format': ImportFormatChoices.CSV,
                'csv_delimiter': CSVDelimiterChoices.AUTO,
            }

            # Attempt to import non-permitted objects (should fail)
            self.assertHttpStatus(self.client.post(self._get_url('bulk_import'), data), 200)
            self.assertEqual(self._get_queryset().count(), initial_count)

            # Update permission constraints to allow all
            obj_perm.constraints = {'pk__gt': 0}  # Dummy permission to allow all
            obj_perm.save()

            # Import permitted objects (should succeed)
            self.assertHttpStatus(self.client.post(self._get_url('bulk_import'), data), 302)
            self.assertEqual(self._get_queryset().count(), initial_count + expected_new_objects)

    class BulkEditObjectsViewTestCase(ModelViewTestCase):
        """
        Edit multiple instances.

        :bulk_edit_data: A dictionary of data to be used when bulk editing a set of objects. This data should differ
                         from that used for initial object creation within setUpTestData().
        """
        bulk_edit_data = {}

        def test_bulk_edit_objects_without_permission(self):
            pk_list = self._get_queryset().values_list('pk', flat=True)[:3]
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }

            # Test GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('bulk_edit')), 403)

            # Try POST without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(self._get_url('bulk_edit'), data), 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_bulk_edit_objects_with_permission(self):
            pk_list = list(self._get_queryset().values_list('pk', flat=True)[:3])
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                data['changelog_message'] = get_random_string(10)

            # Append the form data to the request
            data.update(post_data(self.bulk_edit_data))

            # Assign model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['view', 'change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try POST with model-level permission
            response = self.client.post(self._get_url('bulk_edit'), data)
            self.assertHttpStatus(response, 302)
            for i, instance in enumerate(self._get_queryset().filter(pk__in=pk_list)):
                self.assertInstanceEqual(instance, self.bulk_edit_data)

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                request_id = response.headers.get('X-Request-ID')
                self.assertIsNotNone(request_id, "Unable to determine request ID from response")
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(self.model),
                    changed_object_id__in=pk_list
                )
                self.assertEqual(len(objectchanges), len(pk_list))
                for oc in objectchanges:
                    self.assertEqual(oc.action, ObjectChangeActionChoices.ACTION_UPDATE)
                    self.assertEqual(oc.message, data['changelog_message'])

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'], EXEMPT_EXCLUDE_MODELS=[])
        def test_bulk_edit_objects_with_constrained_permission(self):
            pk_list = list(self._get_queryset().values_list('pk', flat=True)[:3])
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }

            # Append the form data to the request
            data.update(post_data(self.bulk_edit_data))

            # Dynamically determine a constraint that will *not* be matched by the updated objects.
            attr_name = list(self.bulk_edit_data.keys())[0]
            field = self.model._meta.get_field(attr_name)
            value = field.value_from_object(self._get_queryset().first())

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={attr_name: value},
                actions=['view', 'change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Attempt to bulk edit permitted objects into a non-permitted state
            response = self.client.post(self._get_url('bulk_edit'), data)
            self.assertHttpStatus(response, 200)

            # Update permission constraints
            obj_perm.constraints = {'pk__gt': 0}
            obj_perm.save()

            # Bulk edit permitted objects
            self.assertHttpStatus(self.client.post(self._get_url('bulk_edit'), data), 302)
            for i, instance in enumerate(self._get_queryset().filter(pk__in=pk_list)):
                self.assertInstanceEqual(instance, self.bulk_edit_data)

    class BulkDeleteObjectsViewTestCase(ModelViewTestCase):
        """
        Delete multiple instances.
        """
        def test_bulk_delete_objects_without_permission(self):
            pk_list = self._get_queryset().values_list('pk', flat=True)[:3]
            data = {
                'pk': pk_list,
                'confirm': True,
                '_confirm': True,  # Form button
            }

            # Test GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('bulk_delete')), 403)

            # Try POST without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(self._get_url('bulk_delete'), data), 403)

        def test_bulk_delete_objects_with_permission(self):
            pk_list = list(self._get_queryset().values_list('pk', flat=True))[:3]
            data = {
                'pk': pk_list,
                'confirm': True,
                '_confirm': True,  # Form button
            }

            # If supported, add a changelog message
            if issubclass(self.model, ChangeLoggingMixin):
                data['changelog_message'] = get_random_string(10)

            # Assign unconstrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['delete']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try POST with model-level permission
            response = self.client.post(self._get_url('bulk_delete'), data)
            self.assertHttpStatus(response, 302)
            self.assertFalse(self._get_queryset().filter(pk__in=pk_list).exists())

            # Verify ObjectChange creation
            if issubclass(self.model, ChangeLoggingMixin):
                objectchanges = ObjectChange.objects.filter(
                    changed_object_type=ContentType.objects.get_for_model(self.model),
                    changed_object_id__in=pk_list
                )
                self.assertEqual(len(objectchanges), len(pk_list))
                for oc in objectchanges:
                    self.assertEqual(oc.action, ObjectChangeActionChoices.ACTION_DELETE)
                    self.assertEqual(oc.message, data['changelog_message'])

        def test_bulk_delete_objects_with_constrained_permission(self):
            pk_list = self._get_queryset().values_list('pk', flat=True)
            data = {
                'pk': pk_list,
                'confirm': True,
                '_confirm': True,  # Form button
            }

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'pk': 0},  # Dummy permission to deny all
                actions=['delete']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Attempt to bulk delete non-permitted objects
            initial_count = self._get_queryset().count()
            self.assertHttpStatus(self.client.post(self._get_url('bulk_delete'), data), 302)
            self.assertEqual(self._get_queryset().count(), initial_count)

            # Update permission constraints
            obj_perm.constraints = {'pk__gt': 0}  # Dummy permission to allow all
            obj_perm.save()

            # Bulk delete permitted objects
            self.assertHttpStatus(self.client.post(self._get_url('bulk_delete'), data), 302)
            self.assertEqual(self._get_queryset().count(), 0)

    class BulkRenameObjectsViewTestCase(ModelViewTestCase):
        """
        Rename multiple instances.
        """
        rename_data = {
            'find': '^(.*)$',
            'replace': '\\1X',  # Append an X to the original value
            'use_regex': True,
        }

        def test_bulk_rename_objects_without_permission(self):
            pk_list = self._get_queryset().values_list('pk', flat=True)[:3]
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }
            data.update(self.rename_data)

            # Test GET without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.get(self._get_url('bulk_rename')), 403)

            # Try POST without permission
            with disable_warnings('django.request'):
                self.assertHttpStatus(self.client.post(self._get_url('bulk_rename'), data), 403)

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_bulk_rename_objects_with_permission(self):
            objects = self._get_queryset().all()[:3]
            pk_list = [obj.pk for obj in objects]
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }
            data.update(self.rename_data)

            # Assign model-level permission
            obj_perm = ObjectPermission(
                name='Test permission',
                actions=['change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Try POST with model-level permission
            self.assertHttpStatus(self.client.post(self._get_url('bulk_rename'), data), 302)
            for i, instance in enumerate(self._get_queryset().filter(pk__in=pk_list)):
                self.assertEqual(instance.name, f'{objects[i].name}X')

        @override_settings(EXEMPT_VIEW_PERMISSIONS=['*'])
        def test_bulk_rename_objects_with_constrained_permission(self):
            objects = self._get_queryset().all()[:3]
            pk_list = [obj.pk for obj in objects]
            data = {
                'pk': pk_list,
                '_apply': True,  # Form button
            }
            data.update(self.rename_data)

            # Assign constrained permission
            obj_perm = ObjectPermission(
                name='Test permission',
                constraints={'name__regex': '[^X]$'},
                actions=['change']
            )
            obj_perm.save()
            obj_perm.users.add(self.user)
            obj_perm.object_types.add(ObjectType.objects.get_for_model(self.model))

            # Attempt to bulk edit permitted objects into a non-permitted state
            response = self.client.post(self._get_url('bulk_rename'), data)
            self.assertHttpStatus(response, 200)

            # Update permission constraints
            obj_perm.constraints = {'pk__gt': 0}
            obj_perm.save()

            # Bulk rename permitted objects
            self.assertHttpStatus(self.client.post(self._get_url('bulk_rename'), data), 302)
            for i, instance in enumerate(self._get_queryset().filter(pk__in=pk_list)):
                self.assertEqual(instance.name, f'{objects[i].name}X')

    class PrimaryObjectViewTestCase(
        GetObjectViewTestCase,
        GetObjectChangelogViewTestCase,
        CreateObjectViewTestCase,
        EditObjectViewTestCase,
        DeleteObjectViewTestCase,
        ListObjectsViewTestCase,
        BulkImportObjectsViewTestCase,
        BulkEditObjectsViewTestCase,
        BulkDeleteObjectsViewTestCase,
    ):
        """
        TestCase suitable for testing all standard View functions for primary objects
        """
        maxDiff = None

    class OrganizationalObjectViewTestCase(
        GetObjectViewTestCase,
        GetObjectChangelogViewTestCase,
        CreateObjectViewTestCase,
        EditObjectViewTestCase,
        DeleteObjectViewTestCase,
        ListObjectsViewTestCase,
        BulkImportObjectsViewTestCase,
        BulkEditObjectsViewTestCase,
        BulkDeleteObjectsViewTestCase,
    ):
        """
        TestCase suitable for all organizational objects
        """
        maxDiff = None

    class AdminModelViewTestCase(
        GetObjectViewTestCase,
        CreateObjectViewTestCase,
        EditObjectViewTestCase,
        DeleteObjectViewTestCase,
        ListObjectsViewTestCase,
        BulkImportObjectsViewTestCase,
        BulkEditObjectsViewTestCase,
        BulkDeleteObjectsViewTestCase,
    ):
        """
        TestCase suitable for testing all standard View functions for objects which inherit from AdminModel.
        """
        maxDiff = None

    class DeviceComponentTemplateViewTestCase(
        EditObjectViewTestCase,
        DeleteObjectViewTestCase,
        CreateMultipleObjectsViewTestCase,
        BulkEditObjectsViewTestCase,
        BulkRenameObjectsViewTestCase,
        BulkDeleteObjectsViewTestCase,
    ):
        """
        TestCase suitable for testing device component template models (ConsolePortTemplates, InterfaceTemplates, etc.)
        """
        maxDiff = None

    class DeviceComponentViewTestCase(
        GetObjectViewTestCase,
        GetObjectChangelogViewTestCase,
        EditObjectViewTestCase,
        DeleteObjectViewTestCase,
        ListObjectsViewTestCase,
        CreateMultipleObjectsViewTestCase,
        BulkImportObjectsViewTestCase,
        BulkEditObjectsViewTestCase,
        BulkRenameObjectsViewTestCase,
        BulkDeleteObjectsViewTestCase,
    ):
        """
        TestCase suitable for testing device component models (ConsolePorts, Interfaces, etc.)
        """
        maxDiff = None
