import tempfile
from pathlib import Path

from django.contrib.contenttypes.models import ContentType
from django.core.files.uploadedfile import SimpleUploadedFile
from django.forms import ValidationError
from django.test import tag, TestCase

from core.models import AutoSyncRecord, DataSource, ObjectType
from dcim.models import Device, DeviceRole, DeviceType, Location, Manufacturer, Platform, Region, Site, SiteGroup
from extras.models import ConfigContext, ConfigContextProfile, ConfigTemplate, ImageAttachment, Tag, TaggedItem
from tenancy.models import Tenant, TenantGroup
from utilities.exceptions import AbortRequest
from virtualization.models import Cluster, ClusterGroup, ClusterType, VirtualMachine


class ImageAttachmentTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.ct_rack = ContentType.objects.get(app_label='dcim', model='rack')
        cls.image_content = b''

    def _stub_image_attachment(self, object_id, image_filename, name=None):
        """
        Creates an instance of ImageAttachment with the provided object_id and image_name.

        This method prepares a stubbed image attachment to test functionalities that
        require an ImageAttachment object.
        The function initializes the attachment with a specified file name and
        pre-defined image content.
        """
        ia = ImageAttachment(
            object_type=self.ct_rack,
            object_id=object_id,
            name=name,
            image=SimpleUploadedFile(
                name=image_filename,
                content=self.image_content,
                content_type='image/jpeg',
            ),
        )
        return ia

    def test_filename_strips_expected_prefix(self):
        """
        Tests that the filename of the image attachment is stripped of the expected
        prefix.
        """
        ia = self._stub_image_attachment(12, 'image-attachments/rack_12_My_File.png')
        self.assertEqual(ia.filename, 'My_File.png')

    def test_filename_legacy_nested_path_returns_basename(self):
        """
        Tests if the filename of a legacy-nested path correctly returns only the basename.
        """
        # e.g. "image-attachments/rack_12_5/31/23.jpg" -> "23.jpg"
        ia = self._stub_image_attachment(12, 'image-attachments/rack_12_5/31/23.jpg')
        self.assertEqual(ia.filename, '23.jpg')

    def test_filename_no_prefix_returns_basename(self):
        """
        Tests that the filename property correctly returns the basename for an image
        attachment that has no leading prefix in its path.
        """
        ia = self._stub_image_attachment(42, 'image-attachments/just_name.webp')
        self.assertEqual(ia.filename, 'just_name.webp')

    def test_mismatched_prefix_is_not_stripped(self):
        """
        Tests that a mismatched prefix in the filename is not stripped.
        """
        # Prefix does not match object_id -> leave as-is (basename only)
        ia = self._stub_image_attachment(12, 'image-attachments/rack_13_other.png')
        self.assertEqual('rack_13_other.png', ia.filename)

    def test_str_uses_name_when_present(self):
        """
        Tests that the `str` representation of the object uses the
        `name` attribute when provided.
        """
        ia = self._stub_image_attachment(12, 'image-attachments/rack_12_file.png', name='Human title')
        self.assertEqual('Human title', str(ia))

    def test_str_falls_back_to_filename(self):
        """
        Tests that the `str` representation of the object falls back to
        the filename if the name attribute is not set.
        """
        ia = self._stub_image_attachment(12, 'image-attachments/rack_12_file.png', name='')
        self.assertEqual('file.png', str(ia))


class TagTest(TestCase):

    def test_default_ordering_weight_then_name_is_set(self):
        Tag.objects.create(name='Tag 1', slug='tag-1', weight=3000)
        Tag.objects.create(name='Tag 2', slug='tag-2')  # Default: 1000
        Tag.objects.create(name='Tag 3', slug='tag-3', weight=2000)
        Tag.objects.create(name='Tag 4', slug='tag-4', weight=2000)

        tags = Tag.objects.all()

        self.assertEqual(tags[0].slug, 'tag-2')
        self.assertEqual(tags[1].slug, 'tag-3')
        self.assertEqual(tags[2].slug, 'tag-4')
        self.assertEqual(tags[3].slug, 'tag-1')

    def test_tag_related_manager_ordering_weight_then_name(self):
        tags = [
            Tag.objects.create(name='Tag 1', slug='tag-1', weight=3000),
            Tag.objects.create(name='Tag 2', slug='tag-2'),  # Default: 1000
            Tag.objects.create(name='Tag 3', slug='tag-3', weight=2000),
            Tag.objects.create(name='Tag 4', slug='tag-4', weight=2000),
        ]

        site = Site.objects.create(name='Site 1')
        for _tag in tags:
            site.tags.add(_tag)
        site.save()

        site = Site.objects.first()
        tags = site.tags.all()

        self.assertEqual(tags[0].slug, 'tag-2')
        self.assertEqual(tags[1].slug, 'tag-3')
        self.assertEqual(tags[2].slug, 'tag-4')
        self.assertEqual(tags[3].slug, 'tag-1')

    def test_create_tag_unicode(self):
        tag = Tag(name='Testing Unicode: 台灣')
        tag.save()

        self.assertEqual(tag.slug, 'testing-unicode-台灣')

    def test_object_type_validation(self):
        region = Region.objects.create(name='Region 1', slug='region-1')
        sitegroup = SiteGroup.objects.create(name='Site Group 1', slug='site-group-1')

        # Create a Tag that can only be applied to Regions
        tag = Tag.objects.create(name='Tag 1', slug='tag-1')
        tag.object_types.add(ObjectType.objects.get_by_natural_key('dcim', 'region'))

        # Apply the Tag to a Region
        region.tags.add(tag)
        self.assertIn(tag, region.tags.all())

        # Apply the Tag to a SiteGroup
        with self.assertRaises(AbortRequest):
            sitegroup.tags.add(tag)


class ConfigContextTest(TestCase):
    """
    These test cases deal with the weighting, ordering, and deep merge logic of config context data.

    It also ensures the various config context querysets are consistent.
    """
    @classmethod
    def setUpTestData(cls):

        manufacturer = Manufacturer.objects.create(name='Manufacturer 1', slug='manufacturer-1')
        devicetype = DeviceType.objects.create(manufacturer=manufacturer, model='Device Type 1', slug='device-type-1')
        role = DeviceRole.objects.create(name='Device Role 1', slug='device-role-1')
        region = Region.objects.create(name='Region')
        sitegroup = SiteGroup.objects.create(name='Site Group')
        site = Site.objects.create(name='Site 1', slug='site-1', region=region, group=sitegroup)
        location = Location.objects.create(name='Location 1', slug='location-1', site=site)
        Platform.objects.create(name='Platform')
        tenantgroup = TenantGroup.objects.create(name='Tenant Group')
        Tenant.objects.create(name='Tenant', group=tenantgroup)
        Tag.objects.create(name='Tag', slug='tag')
        Tag.objects.create(name='Tag2', slug='tag2')

        Device.objects.create(
            name='Device 1',
            device_type=devicetype,
            role=role,
            site=site,
            location=location
        )

    def test_higher_weight_wins(self):
        device = Device.objects.first()
        context1 = ConfigContext(
            name="context 1",
            weight=101,
            data={
                "a": 123,
                "b": 456,
                "c": 777
            }
        )
        context2 = ConfigContext(
            name="context 2",
            weight=100,
            data={
                "a": 123,
                "b": 456,
                "c": 789
            }
        )
        ConfigContext.objects.bulk_create([context1, context2])

        expected_data = {
            "a": 123,
            "b": 456,
            "c": 777
        }
        self.assertEqual(device.get_config_context(), expected_data)

    def test_name_ordering_after_weight(self):
        device = Device.objects.first()
        context1 = ConfigContext(
            name="context 1",
            weight=100,
            data={
                "a": 123,
                "b": 456,
                "c": 777
            }
        )
        context2 = ConfigContext(
            name="context 2",
            weight=100,
            data={
                "a": 123,
                "b": 456,
                "c": 789
            }
        )
        ConfigContext.objects.bulk_create([context1, context2])

        expected_data = {
            "a": 123,
            "b": 456,
            "c": 789
        }
        self.assertEqual(device.get_config_context(), expected_data)

    def test_schema_validation(self):
        """
        Check that the JSON schema defined by the assigned profile is enforced.
        """
        profile = ConfigContextProfile.objects.create(
            name="Config context profile 1",
            schema={
                "properties": {
                    "foo": {
                        "type": "string"
                    }
                },
                "required": [
                    "foo"
                ]
            }
        )

        with self.assertRaises(ValidationError):
            # Missing required attribute
            ConfigContext(name="CC1", profile=profile, data={}).clean()
        with self.assertRaises(ValidationError):
            # Invalid attribute type
            ConfigContext(name="CC1", profile=profile, data={"foo": 123}).clean()
        ConfigContext(name="CC1", profile=profile, data={"foo": "bar"}).clean()

    def test_annotation_same_as_get_for_object(self):
        """
        This test incorporates features from all of the above tests cases to ensure
        the annotate_config_context_data() and get_for_object() queryset methods are the same.
        """
        device = Device.objects.first()
        context1 = ConfigContext(
            name="context 1",
            weight=101,
            data={
                "a": 123,
                "b": 456,
                "c": 777
            }
        )
        context2 = ConfigContext(
            name="context 2",
            weight=100,
            data={
                "a": 123,
                "b": 456,
                "c": 789
            }
        )
        context3 = ConfigContext(
            name="context 3",
            weight=99,
            data={
                "d": 1
            }
        )
        context4 = ConfigContext(
            name="context 4",
            weight=99,
            data={
                "d": 2
            }
        )
        ConfigContext.objects.bulk_create([context1, context2, context3, context4])

        annotated_queryset = Device.objects.filter(name=device.name).annotate_config_context_data()
        self.assertEqual(device.get_config_context(), annotated_queryset[0].get_config_context())

    def test_annotation_same_as_get_for_object_device_relations(self):
        region = Region.objects.first()
        sitegroup = SiteGroup.objects.first()
        site = Site.objects.first()
        location = Location.objects.first()
        platform = Platform.objects.first()
        tenantgroup = TenantGroup.objects.first()
        tenant = Tenant.objects.first()
        tag = Tag.objects.first()

        region_context = ConfigContext.objects.create(
            name="region",
            weight=100,
            data={
                "region": 1
            }
        )
        region_context.regions.add(region)

        sitegroup_context = ConfigContext.objects.create(
            name="sitegroup",
            weight=100,
            data={
                "sitegroup": 1
            }
        )
        sitegroup_context.site_groups.add(sitegroup)

        site_context = ConfigContext.objects.create(
            name="site",
            weight=100,
            data={
                "site": 1
            }
        )
        site_context.sites.add(site)

        location_context = ConfigContext.objects.create(
            name="location",
            weight=100,
            data={
                "location": 1
            }
        )
        location_context.locations.add(location)

        platform_context = ConfigContext.objects.create(
            name="platform",
            weight=100,
            data={
                "platform": 1
            }
        )
        platform_context.platforms.add(platform)

        tenant_group_context = ConfigContext.objects.create(
            name="tenant group",
            weight=100,
            data={
                "tenant_group": 1
            }
        )
        tenant_group_context.tenant_groups.add(tenantgroup)

        tenant_context = ConfigContext.objects.create(
            name="tenant",
            weight=100,
            data={
                "tenant": 1
            }
        )
        tenant_context.tenants.add(tenant)

        tag_context = ConfigContext.objects.create(
            name="tag",
            weight=100,
            data={
                "tag": 1
            }
        )
        tag_context.tags.add(tag)

        device = Device.objects.create(
            name="Device 2",
            site=site,
            location=location,
            tenant=tenant,
            platform=platform,
            role=DeviceRole.objects.first(),
            device_type=DeviceType.objects.first()
        )
        device.tags.add(tag)

        annotated_queryset = Device.objects.filter(name=device.name).annotate_config_context_data()
        self.assertEqual(device.get_config_context(), annotated_queryset[0].get_config_context())

    def test_annotation_same_as_get_for_object_virtualmachine_relations(self):
        region = Region.objects.first()
        sitegroup = SiteGroup.objects.first()
        site = Site.objects.first()
        platform = Platform.objects.first()
        tenantgroup = TenantGroup.objects.first()
        tenant = Tenant.objects.first()
        tag = Tag.objects.first()
        cluster_type = ClusterType.objects.create(name="Cluster Type")
        cluster_group = ClusterGroup.objects.create(name="Cluster Group")
        cluster = Cluster.objects.create(
            name="Cluster",
            group=cluster_group,
            type=cluster_type,
            scope=site,
        )

        region_context = ConfigContext.objects.create(
            name="region",
            weight=100,
            data={"region": 1}
        )
        region_context.regions.add(region)

        sitegroup_context = ConfigContext.objects.create(
            name="sitegroup",
            weight=100,
            data={"sitegroup": 1}
        )
        sitegroup_context.site_groups.add(sitegroup)

        site_context = ConfigContext.objects.create(
            name="site",
            weight=100,
            data={"site": 1}
        )
        site_context.sites.add(site)

        platform_context = ConfigContext.objects.create(
            name="platform",
            weight=100,
            data={"platform": 1}
        )
        platform_context.platforms.add(platform)

        tenant_group_context = ConfigContext.objects.create(
            name="tenant group",
            weight=100,
            data={"tenant_group": 1}
        )
        tenant_group_context.tenant_groups.add(tenantgroup)

        tenant_context = ConfigContext.objects.create(
            name="tenant",
            weight=100,
            data={"tenant": 1}
        )
        tenant_context.tenants.add(tenant)

        tag_context = ConfigContext.objects.create(
            name="tag",
            weight=100,
            data={"tag": 1}
        )
        tag_context.tags.add(tag)

        cluster_type_context = ConfigContext.objects.create(
            name="cluster type",
            weight=100,
            data={"cluster_type": 1}
        )
        cluster_type_context.cluster_types.add(cluster_type)

        cluster_group_context = ConfigContext.objects.create(
            name="cluster group",
            weight=100,
            data={"cluster_group": 1}
        )
        cluster_group_context.cluster_groups.add(cluster_group)

        cluster_context = ConfigContext.objects.create(
            name="cluster",
            weight=100,
            data={"cluster": 1}
        )
        cluster_context.clusters.add(cluster)

        virtual_machine = VirtualMachine.objects.create(
            name="VM 1",
            cluster=cluster,
            tenant=tenant,
            platform=platform,
            role=DeviceRole.objects.first()
        )
        virtual_machine.tags.add(tag)

        annotated_queryset = VirtualMachine.objects.filter(name=virtual_machine.name).annotate_config_context_data()
        self.assertEqual(virtual_machine.get_config_context(), annotated_queryset[0].get_config_context())

    def test_virtualmachine_site_context(self):
        """
        Check that config context associated with a site applies to a VM whether the VM is assigned
        directly to that site or via its cluster.
        """
        site = Site.objects.first()
        cluster_type = ClusterType.objects.create(name="Cluster Type")
        cluster = Cluster.objects.create(name="Cluster", type=cluster_type, scope=site)
        vm_role = DeviceRole.objects.first()

        # Create a ConfigContext associated with the site
        context = ConfigContext.objects.create(
            name="context1",
            weight=100,
            data={"foo": True}
        )
        context.sites.add(site)

        # Create one VM assigned directly to the site, and one assigned via the cluster
        vm1 = VirtualMachine.objects.create(name="VM 1", site=site, role=vm_role)
        vm2 = VirtualMachine.objects.create(name="VM 2", cluster=cluster, role=vm_role)

        # Check that their individually rendered config contexts are identical
        self.assertEqual(
            vm1.get_config_context(),
            vm2.get_config_context()
        )

        # Check that their annotated config contexts are identical
        vms = VirtualMachine.objects.filter(pk__in=(vm1.pk, vm2.pk)).annotate_config_context_data()
        self.assertEqual(
            vms[0].get_config_context(),
            vms[1].get_config_context()
        )

    def test_valid_local_context_data(self):
        device = Device.objects.first()
        device.local_context_data = None
        device.clean()

        device.local_context_data = {"foo": "bar"}
        device.clean()

    def test_invalid_local_context_data(self):
        device = Device.objects.first()

        device.local_context_data = ""
        with self.assertRaises(ValidationError):
            device.clean()

        device.local_context_data = 0
        with self.assertRaises(ValidationError):
            device.clean()

        device.local_context_data = False
        with self.assertRaises(ValidationError):
            device.clean()

        device.local_context_data = 'foo'
        with self.assertRaises(ValidationError):
            device.clean()

    @tag('regression')
    def test_multiple_tags_return_distinct_objects(self):
        """
        Tagged items use a generic relationship, which results in duplicate rows being returned when queried.
        This is combated by appending distinct() to the config context querysets. This test creates a config
        context assigned to two tags and ensures objects related to those same two tags result in only a single
        config context record being returned.

        See https://github.com/netbox-community/netbox/issues/5314
        """
        site = Site.objects.first()
        platform = Platform.objects.first()
        tenant = Tenant.objects.first()
        tags = Tag.objects.all()

        tag_context = ConfigContext.objects.create(
            name="tag",
            weight=100,
            data={
                "tag": 1
            }
        )
        tag_context.tags.set(tags)

        device = Device.objects.create(
            name="Device 3",
            site=site,
            tenant=tenant,
            platform=platform,
            role=DeviceRole.objects.first(),
            device_type=DeviceType.objects.first()
        )
        device.tags.set(tags)

        annotated_queryset = Device.objects.filter(name=device.name).annotate_config_context_data()
        self.assertEqual(ConfigContext.objects.get_for_object(device).count(), 1)
        self.assertEqual(device.get_config_context(), annotated_queryset[0].get_config_context())

    @tag('regression')
    def test_multiple_tags_return_distinct_objects_with_separate_config_contexts(self):
        """
        Tagged items use a generic relationship, which results in duplicate rows being returned when queried.
        This is combated by appending distinct() to the config context querysets. This test creates a config
        context assigned to two tags and ensures objects related to those same two tags result in only a single
        config context record being returned.

        This test case is separate from the above in that it deals with multiple config context objects in play.

        See https://github.com/netbox-community/netbox/issues/5387
        """
        site = Site.objects.first()
        platform = Platform.objects.first()
        tenant = Tenant.objects.first()
        tag1, tag2 = list(Tag.objects.all())

        tag_context_1 = ConfigContext.objects.create(
            name="tag-1",
            weight=100,
            data={
                "tag": 1
            }
        )
        tag_context_1.tags.add(tag1)

        tag_context_2 = ConfigContext.objects.create(
            name="tag-2",
            weight=100,
            data={
                "tag": 1
            }
        )
        tag_context_2.tags.add(tag2)

        device = Device.objects.create(
            name="Device 3",
            site=site,
            tenant=tenant,
            platform=platform,
            role=DeviceRole.objects.first(),
            device_type=DeviceType.objects.first()
        )
        device.tags.set([tag1, tag2])

        annotated_queryset = Device.objects.filter(name=device.name).annotate_config_context_data()
        self.assertEqual(ConfigContext.objects.get_for_object(device).count(), 2)
        self.assertEqual(device.get_config_context(), annotated_queryset[0].get_config_context())

    @tag('performance', 'regression')
    def test_config_context_annotation_query_optimization(self):
        """
        Regression test for issue #20327: Ensure config context annotation
        doesn't use expensive DISTINCT on main query.

        Verifies that DISTINCT is only used in tag subquery where needed,
        not on the main device query which is expensive for large datasets.
        """
        device = Device.objects.first()
        queryset = Device.objects.filter(pk=device.pk).annotate_config_context_data()

        # Main device query should NOT use DISTINCT
        self.assertFalse(queryset.query.distinct)

        # Check that tag subqueries DO use DISTINCT by inspecting the annotation
        config_annotation = queryset.query.annotations.get('config_context_data')
        self.assertIsNotNone(config_annotation)

        def find_tag_subqueries(where_node):
            """Find subqueries in WHERE clause that relate to tag filtering"""
            subqueries = []

            def traverse(node):
                if hasattr(node, 'children'):
                    for child in node.children:
                        try:
                            if child.rhs.query.model is TaggedItem:
                                subqueries.append(child.rhs.query)
                        except AttributeError:
                            traverse(child)
            traverse(where_node)
            return subqueries

        # Find subqueries in the WHERE clause that should have DISTINCT
        tag_subqueries = find_tag_subqueries(config_annotation.query.where)
        distinct_subqueries = [sq for sq in tag_subqueries if sq.distinct]

        # Verify we found at least one DISTINCT subquery for tags
        self.assertEqual(len(distinct_subqueries), 1)
        self.assertTrue(distinct_subqueries[0].distinct)


class ConfigTemplateTest(TestCase):
    """
    TODO: These test cases deal with the weighting, ordering, and deep merge logic of config context data.
    """
    MAIN_TEMPLATE = """
    {%- include 'base.j2' %}
    """.strip()
    BASE_TEMPLATE = """
    Hi
    """.strip()

    @classmethod
    def _create_template_file(cls, templates_dir, file_name, content):
        template_file_name = file_name
        if not template_file_name.endswith('j2'):
            template_file_name += '.j2'
        temp_file_path = templates_dir / template_file_name

        with open(temp_file_path, 'w') as f:
            f.write(content)

    @classmethod
    def setUpTestData(cls):
        temp_dir = tempfile.TemporaryDirectory()
        templates_dir = Path(temp_dir.name) / "templates"
        templates_dir.mkdir(parents=True, exist_ok=True)

        cls._create_template_file(templates_dir, 'base.j2', cls.BASE_TEMPLATE)
        cls._create_template_file(templates_dir, 'main.j2', cls.MAIN_TEMPLATE)

        data_source = DataSource(
            name="Test DataSource",
            type="local",
            source_url=str(templates_dir),
        )
        data_source.save()
        data_source.sync()

        base_config_template = ConfigTemplate(
            name="BaseTemplate",
            data_file=data_source.datafiles.filter(path__endswith='base.j2').first()
        )
        base_config_template.clean()
        base_config_template.save()
        cls.base_config_template = base_config_template

        main_config_template = ConfigTemplate(
            name="MainTemplate",
            data_file=data_source.datafiles.filter(path__endswith='main.j2').first()
        )
        main_config_template.clean()
        main_config_template.save()
        cls.main_config_template = main_config_template

    @tag('regression')
    def test_config_template_with_data_source(self):
        self.assertEqual(self.BASE_TEMPLATE, self.base_config_template.render({}))

    @tag('regression')
    def test_config_template_with_data_source_nested_templates(self):
        self.assertEqual(self.BASE_TEMPLATE, self.main_config_template.render({}))

    @tag('regression')
    def test_autosyncrecord_cleanup_on_detach(self):
        """Test that AutoSyncRecord is deleted when detaching from DataSource."""
        with tempfile.TemporaryDirectory() as temp_dir:
            templates_dir = Path(temp_dir) / "templates"
            templates_dir.mkdir(parents=True, exist_ok=True)

            self._create_template_file(templates_dir, 'test.j2', 'Test content')

            data_source = DataSource(
                name="Test DataSource for Detach",
                type="local",
                source_url=str(templates_dir),
            )
            data_source.save()
            data_source.sync()

            data_file = data_source.datafiles.filter(path__endswith='test.j2').first()

            # Create a ConfigTemplate with data_file and auto_sync_enabled
            config_template = ConfigTemplate(
                name="TestTemplateForDetach",
                data_file=data_file,
                auto_sync_enabled=True
            )
            config_template.clean()
            config_template.save()

            # Verify AutoSyncRecord was created
            object_type = ObjectType.objects.get_for_model(ConfigTemplate)
            autosync_records = AutoSyncRecord.objects.filter(
                object_type=object_type,
                object_id=config_template.pk
            )
            self.assertEqual(autosync_records.count(), 1, "AutoSyncRecord should be created")

            # Detach from DataSource
            config_template.data_file = None
            config_template.data_source = None
            config_template.auto_sync_enabled = False
            config_template.clean()
            config_template.save()

            # Verify AutoSyncRecord was deleted
            autosync_records = AutoSyncRecord.objects.filter(
                object_type=object_type,
                object_id=config_template.pk
            )
            self.assertEqual(autosync_records.count(), 0, "AutoSyncRecord should be deleted after detaching")