from django import forms
from django.contrib.contenttypes.models import ContentType
from django.utils.translation import gettext_lazy as _
from timezone_field import TimeZoneFormField

from dcim.choices import *
from dcim.constants import *
from dcim.models import *
from extras.models import ConfigTemplate
from ipam.choices import VLANQinQRoleChoices
from ipam.models import ASN, IPAddress, VLAN, VLANGroup, VLANTranslationPolicy, VRF
from netbox.forms import NetBoxModelForm
from tenancy.forms import TenancyForm
from users.models import User
from utilities.forms import add_blank_choice, get_field_value
from utilities.forms.fields import (
    CommentField, DynamicModelChoiceField, DynamicModelMultipleChoiceField, JSONField, NumericArrayField, SlugField,
)
from utilities.forms.rendering import FieldSet, InlineFields, TabbedGroups
from utilities.forms.widgets import APISelect, ClearableFileInput, HTMXSelect, NumberWithOptions, SelectWithPK
from virtualization.models import Cluster, VMInterface
from wireless.models import WirelessLAN, WirelessLANGroup
from .common import InterfaceCommonForm, ModuleCommonForm

__all__ = (
    'CableForm',
    'ConsolePortForm',
    'ConsolePortTemplateForm',
    'ConsoleServerPortForm',
    'ConsoleServerPortTemplateForm',
    'DeviceBayForm',
    'DeviceBayTemplateForm',
    'DeviceForm',
    'DeviceRoleForm',
    'DeviceTypeForm',
    'DeviceVCMembershipForm',
    'FrontPortForm',
    'FrontPortTemplateForm',
    'InterfaceForm',
    'InterfaceTemplateForm',
    'InventoryItemForm',
    'InventoryItemRoleForm',
    'InventoryItemTemplateForm',
    'LocationForm',
    'MACAddressForm',
    'ManufacturerForm',
    'ModuleForm',
    'ModuleBayForm',
    'ModuleBayTemplateForm',
    'ModuleTypeForm',
    'PlatformForm',
    'PopulateDeviceBayForm',
    'PowerFeedForm',
    'PowerOutletForm',
    'PowerOutletTemplateForm',
    'PowerPanelForm',
    'PowerPortForm',
    'PowerPortTemplateForm',
    'RackForm',
    'RackReservationForm',
    'RackRoleForm',
    'RackTypeForm',
    'RearPortForm',
    'RearPortTemplateForm',
    'RegionForm',
    'SiteForm',
    'SiteGroupForm',
    'VCMemberSelectForm',
    'VirtualChassisForm',
    'VirtualDeviceContextForm'
)


class RegionForm(NetBoxModelForm):
    parent = DynamicModelChoiceField(
        label=_('Parent'),
        queryset=Region.objects.all(),
        required=False
    )
    slug = SlugField()

    fieldsets = (
        FieldSet('parent', 'name', 'slug', 'description', 'tags'),
    )

    class Meta:
        model = Region
        fields = (
            'parent', 'name', 'slug', 'description', 'tags',
        )


class SiteGroupForm(NetBoxModelForm):
    parent = DynamicModelChoiceField(
        label=_('Parent'),
        queryset=SiteGroup.objects.all(),
        required=False
    )
    slug = SlugField()

    fieldsets = (
        FieldSet('parent', 'name', 'slug', 'description', 'tags'),
    )

    class Meta:
        model = SiteGroup
        fields = (
            'parent', 'name', 'slug', 'description', 'tags',
        )


class SiteForm(TenancyForm, NetBoxModelForm):
    region = DynamicModelChoiceField(
        label=_('Region'),
        queryset=Region.objects.all(),
        required=False,
        quick_add=True
    )
    group = DynamicModelChoiceField(
        label=_('Group'),
        queryset=SiteGroup.objects.all(),
        required=False,
        quick_add=True
    )
    asns = DynamicModelMultipleChoiceField(
        queryset=ASN.objects.all(),
        label=_('ASNs'),
        required=False
    )
    slug = SlugField()
    time_zone = TimeZoneFormField(
        label=_('Time zone'),
        choices=add_blank_choice(TimeZoneFormField().choices),
        required=False
    )
    comments = CommentField()

    fieldsets = (
        FieldSet(
            'name', 'slug', 'status', 'region', 'group', 'facility', 'asns', 'time_zone', 'description', 'tags',
            name=_('Site')
        ),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy')),
        FieldSet('physical_address', 'shipping_address', 'latitude', 'longitude', name=_('Contact Info')),
    )

    class Meta:
        model = Site
        fields = (
            'name', 'slug', 'status', 'region', 'group', 'tenant_group', 'tenant', 'facility', 'asns', 'time_zone',
            'description', 'physical_address', 'shipping_address', 'latitude', 'longitude', 'comments', 'tags',
        )
        widgets = {
            'physical_address': forms.Textarea(
                attrs={
                    'rows': 3,
                }
            ),
            'shipping_address': forms.Textarea(
                attrs={
                    'rows': 3,
                }
            ),
        }


class LocationForm(TenancyForm, NetBoxModelForm):
    site = DynamicModelChoiceField(
        label=_('Site'),
        queryset=Site.objects.all(),
        selector=True
    )
    parent = DynamicModelChoiceField(
        label=_('Parent'),
        queryset=Location.objects.all(),
        required=False,
        query_params={
            'site_id': '$site'
        }
    )
    slug = SlugField()

    fieldsets = (
        FieldSet('site', 'parent', 'name', 'slug', 'status', 'facility', 'description', 'tags', name=_('Location')),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy')),
    )

    class Meta:
        model = Location
        fields = (
            'site', 'parent', 'name', 'slug', 'status', 'description', 'tenant_group', 'tenant', 'facility', 'tags',
        )


class RackRoleForm(NetBoxModelForm):
    slug = SlugField()

    fieldsets = (
        FieldSet('name', 'slug', 'color', 'description', 'tags', name=_('Rack Role')),
    )

    class Meta:
        model = RackRole
        fields = [
            'name', 'slug', 'color', 'description', 'tags',
        ]


class RackTypeForm(NetBoxModelForm):
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all(),
        quick_add=True
    )
    comments = CommentField()
    slug = SlugField(
        label=_('Slug'),
        slug_source='model'
    )

    fieldsets = (
        FieldSet('manufacturer', 'model', 'slug', 'description', 'form_factor', 'tags', name=_('Rack Type')),
        FieldSet(
            'width', 'u_height',
            InlineFields('outer_width', 'outer_depth', 'outer_unit', label=_('Outer Dimensions')),
            InlineFields('weight', 'max_weight', 'weight_unit', label=_('Weight')),
            'mounting_depth', name=_('Dimensions')
        ),
        FieldSet('starting_unit', 'desc_units', name=_('Numbering')),
    )

    class Meta:
        model = RackType
        fields = [
            'manufacturer', 'model', 'slug', 'form_factor', 'width', 'u_height', 'starting_unit', 'desc_units',
            'outer_width', 'outer_depth', 'outer_unit', 'mounting_depth', 'weight', 'max_weight', 'weight_unit',
            'description', 'comments', 'tags',
        ]


class RackForm(TenancyForm, NetBoxModelForm):
    site = DynamicModelChoiceField(
        label=_('Site'),
        queryset=Site.objects.all(),
        selector=True
    )
    location = DynamicModelChoiceField(
        label=_('Location'),
        queryset=Location.objects.all(),
        required=False,
        query_params={
            'site_id': '$site'
        }
    )
    role = DynamicModelChoiceField(
        label=_('Role'),
        queryset=RackRole.objects.all(),
        required=False
    )
    rack_type = DynamicModelChoiceField(
        label=_('Rack Type'),
        queryset=RackType.objects.all(),
        required=False,
        help_text=_("Select a pre-defined rack type, or set physical characteristics below.")
    )
    comments = CommentField()

    fieldsets = (
        FieldSet(
            'site', 'location', 'name', 'status', 'role', 'rack_type', 'description', 'airflow', 'tags',
            name=_('Rack')
        ),
        FieldSet('facility_id', 'serial', 'asset_tag', name=_('Inventory Control')),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy')),
    )

    class Meta:
        model = Rack
        fields = [
            'site', 'location', 'name', 'facility_id', 'tenant_group', 'tenant', 'status', 'role', 'serial',
            'asset_tag', 'rack_type', 'form_factor', 'width', 'u_height', 'starting_unit', 'desc_units', 'outer_width',
            'outer_depth', 'outer_unit', 'mounting_depth', 'airflow', 'weight', 'max_weight', 'weight_unit',
            'description', 'comments', 'tags',
        ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Mimic HTMXSelect()
        self.fields['rack_type'].widget.attrs.update({
            'hx-get': '.',
            'hx-include': '#form_fields',
            'hx-target': '#form_fields',
        })

        # Omit RackType-defined fields if rack_type is set
        if get_field_value(self, 'rack_type'):
            for field_name in Rack.RACKTYPE_FIELDS:
                del self.fields[field_name]
        else:
            self.fieldsets = (
                *self.fieldsets,
                FieldSet(
                    'form_factor', 'width', 'starting_unit', 'u_height',
                    InlineFields('outer_width', 'outer_depth', 'outer_unit', label=_('Outer Dimensions')),
                    InlineFields('weight', 'max_weight', 'weight_unit', label=_('Weight')),
                    'mounting_depth', 'desc_units', name=_('Dimensions')
                ),
            )


class RackReservationForm(TenancyForm, NetBoxModelForm):
    rack = DynamicModelChoiceField(
        label=_('Rack'),
        queryset=Rack.objects.all(),
        selector=True
    )
    units = NumericArrayField(
        label=_('Units'),
        base_field=forms.IntegerField(),
        help_text=_("Comma-separated list of numeric unit IDs. A range may be specified using a hyphen.")
    )
    user = forms.ModelChoiceField(
        label=_('User'),
        queryset=User.objects.order_by('username')
    )
    comments = CommentField()

    fieldsets = (
        FieldSet('rack', 'units', 'user', 'description', 'tags', name=_('Reservation')),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy')),
    )

    class Meta:
        model = RackReservation
        fields = [
            'rack', 'units', 'user', 'tenant_group', 'tenant', 'description', 'comments', 'tags',
        ]


class ManufacturerForm(NetBoxModelForm):
    slug = SlugField()

    fieldsets = (
        FieldSet('name', 'slug', 'description', 'tags', name=_('Manufacturer')),
    )

    class Meta:
        model = Manufacturer
        fields = [
            'name', 'slug', 'description', 'tags',
        ]


class DeviceTypeForm(NetBoxModelForm):
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all(),
        quick_add=True
    )
    default_platform = DynamicModelChoiceField(
        label=_('Default platform'),
        queryset=Platform.objects.all(),
        required=False,
        selector=True,
        query_params={
            'manufacturer_id': ['$manufacturer', 'null'],
        }
    )
    slug = SlugField(
        label=_('Slug'),
        slug_source='model'
    )
    comments = CommentField()

    fieldsets = (
        FieldSet('manufacturer', 'model', 'slug', 'default_platform', 'description', 'tags', name=_('Device Type')),
        FieldSet(
            'u_height', 'exclude_from_utilization', 'is_full_depth', 'part_number', 'subdevice_role', 'airflow',
            'weight', 'weight_unit', name=_('Chassis')
        ),
        FieldSet('front_image', 'rear_image', name=_('Images')),
    )

    class Meta:
        model = DeviceType
        fields = [
            'manufacturer', 'model', 'slug', 'default_platform', 'part_number', 'u_height', 'exclude_from_utilization',
            'is_full_depth', 'subdevice_role', 'airflow', 'weight', 'weight_unit', 'front_image', 'rear_image',
            'description', 'comments', 'tags',
        ]
        widgets = {
            'front_image': ClearableFileInput(attrs={
                'accept': DEVICETYPE_IMAGE_FORMATS
            }),
            'rear_image': ClearableFileInput(attrs={
                'accept': DEVICETYPE_IMAGE_FORMATS
            }),
        }


class ModuleTypeForm(NetBoxModelForm):
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all()
    )
    comments = CommentField()

    fieldsets = (
        FieldSet('manufacturer', 'model', 'part_number', 'description', 'tags', name=_('Module Type')),
        FieldSet('airflow', 'weight', 'weight_unit', name=_('Chassis'))
    )

    class Meta:
        model = ModuleType
        fields = [
            'manufacturer', 'model', 'part_number', 'airflow', 'weight', 'weight_unit', 'description',
            'comments', 'tags',
        ]


class DeviceRoleForm(NetBoxModelForm):
    config_template = DynamicModelChoiceField(
        label=_('Config template'),
        queryset=ConfigTemplate.objects.all(),
        required=False
    )
    slug = SlugField()

    fieldsets = (
        FieldSet(
            'name', 'slug', 'color', 'vm_role', 'config_template', 'description', 'tags', name=_('Device Role')
        ),
    )

    class Meta:
        model = DeviceRole
        fields = [
            'name', 'slug', 'color', 'vm_role', 'config_template', 'description', 'tags',
        ]


class PlatformForm(NetBoxModelForm):
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all(),
        required=False,
        quick_add=True
    )
    config_template = DynamicModelChoiceField(
        label=_('Config template'),
        queryset=ConfigTemplate.objects.all(),
        required=False
    )
    slug = SlugField(
        label=_('Slug'),
        max_length=64
    )

    fieldsets = (
        FieldSet('name', 'slug', 'manufacturer', 'config_template', 'description', 'tags', name=_('Platform')),
    )

    class Meta:
        model = Platform
        fields = [
            'name', 'slug', 'manufacturer', 'config_template', 'description', 'tags',
        ]


class DeviceForm(TenancyForm, NetBoxModelForm):
    site = DynamicModelChoiceField(
        label=_('Site'),
        queryset=Site.objects.all(),
        selector=True
    )
    location = DynamicModelChoiceField(
        label=_('Location'),
        queryset=Location.objects.all(),
        required=False,
        query_params={
            'site_id': '$site'
        },
        initial_params={
            'racks': '$rack'
        }
    )
    rack = DynamicModelChoiceField(
        label=_('Rack'),
        queryset=Rack.objects.all(),
        required=False,
        query_params={
            'site_id': '$site',
            'location_id': '$location',
        }
    )
    position = forms.DecimalField(
        label=_('Position'),
        required=False,
        help_text=_("The lowest-numbered unit occupied by the device"),
        localize=True,
        widget=APISelect(
            api_url='/api/dcim/racks/{{rack}}/elevation/',
            attrs={
                'ts-disabled-field': 'device',
                'data-dynamic-params': '[{"fieldName":"face","queryParam":"face"}]'
            },
        )
    )
    device_type = DynamicModelChoiceField(
        label=_('Device type'),
        queryset=DeviceType.objects.all(),
        context={
            'parent': 'manufacturer',
        },
        selector=True
    )
    role = DynamicModelChoiceField(
        label=_('Device role'),
        queryset=DeviceRole.objects.all(),
        quick_add=True
    )
    platform = DynamicModelChoiceField(
        label=_('Platform'),
        queryset=Platform.objects.all(),
        required=False,
        selector=True,
        query_params={
            'available_for_device_type': '$device_type',
        }
    )
    cluster = DynamicModelChoiceField(
        label=_('Cluster'),
        queryset=Cluster.objects.all(),
        required=False,
        selector=True,
        query_params={
            'site_id': ['$site', 'null']
        },
    )
    comments = CommentField()
    local_context_data = JSONField(
        required=False,
        label=''
    )
    virtual_chassis = DynamicModelChoiceField(
        label=_('Virtual chassis'),
        queryset=VirtualChassis.objects.all(),
        required=False,
        context={
            'parent': 'master',
        },
        selector=True
    )
    vc_position = forms.IntegerField(
        required=False,
        label=_('Position'),
        help_text=_("The position in the virtual chassis this device is identified by")
    )
    vc_priority = forms.IntegerField(
        required=False,
        label=_('Priority'),
        help_text=_("The priority of the device in the virtual chassis")
    )
    config_template = DynamicModelChoiceField(
        label=_('Config template'),
        queryset=ConfigTemplate.objects.all(),
        required=False
    )

    class Meta:
        model = Device
        fields = [
            'name', 'role', 'device_type', 'serial', 'asset_tag', 'site', 'rack', 'location', 'position', 'face',
            'latitude', 'longitude', 'status', 'airflow', 'platform', 'primary_ip4', 'primary_ip6', 'oob_ip', 'cluster',
            'tenant_group', 'tenant', 'virtual_chassis', 'vc_position', 'vc_priority', 'description', 'config_template',
            'comments', 'tags', 'local_context_data',
        ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        if self.instance.pk:

            # Compile list of choices for primary IPv4 and IPv6 addresses
            oob_ip_choices = [(None, '---------')]
            for family in [4, 6]:
                ip_choices = [(None, '---------')]

                # Gather PKs of all interfaces belonging to this Device or a peer VirtualChassis member
                interface_ids = self.instance.vc_interfaces(if_master=False).values_list('pk', flat=True)

                # Collect interface IPs
                interface_ips = IPAddress.objects.filter(
                    address__family=family,
                    assigned_object_type=ContentType.objects.get_for_model(Interface),
                    assigned_object_id__in=interface_ids
                ).prefetch_related('assigned_object')
                if interface_ips:
                    ip_list = [(ip.id, f'{ip.address} ({ip.assigned_object})') for ip in interface_ips]
                    ip_choices.append(('Interface IPs', ip_list))
                    oob_ip_choices.extend(ip_list)
                # Collect NAT IPs
                nat_ips = IPAddress.objects.prefetch_related('nat_inside').filter(
                    address__family=family,
                    nat_inside__assigned_object_type=ContentType.objects.get_for_model(Interface),
                    nat_inside__assigned_object_id__in=interface_ids
                ).prefetch_related('assigned_object')
                if nat_ips:
                    ip_list = [(ip.id, f'{ip.address} (NAT)') for ip in nat_ips]
                    ip_choices.append(('NAT IPs', ip_list))
                self.fields['primary_ip{}'.format(family)].choices = ip_choices
            self.fields['oob_ip'].choices = oob_ip_choices

            # If editing an existing device, exclude it from the list of occupied rack units. This ensures that a device
            # can be flipped from one face to another.
            self.fields['position'].widget.add_query_param('exclude', self.instance.pk)

            # Disable rack assignment if this is a child device installed in a parent device
            if self.instance.device_type.is_child_device and hasattr(self.instance, 'parent_bay'):
                self.fields['site'].disabled = True
                self.fields['rack'].disabled = True
                self.initial['site'] = self.instance.parent_bay.device.site_id
                self.initial['rack'] = self.instance.parent_bay.device.rack_id

        else:

            # An object that doesn't exist yet can't have any IPs assigned to it
            self.fields['primary_ip4'].choices = []
            self.fields['primary_ip4'].widget.attrs['readonly'] = True
            self.fields['primary_ip6'].choices = []
            self.fields['primary_ip6'].widget.attrs['readonly'] = True
            self.fields['oob_ip'].choices = []
            self.fields['oob_ip'].widget.attrs['readonly'] = True

        # Rack position
        position = self.data.get('position') or self.initial.get('position')
        if position:
            self.fields['position'].widget.choices = [(position, f'U{position}')]


class ModuleForm(ModuleCommonForm, NetBoxModelForm):
    device = DynamicModelChoiceField(
        label=_('Device'),
        queryset=Device.objects.all(),
        initial_params={
            'modulebays': '$module_bay'
        }
    )
    module_bay = DynamicModelChoiceField(
        label=_('Module bay'),
        queryset=ModuleBay.objects.all(),
        query_params={
            'device_id': '$device'
        }
    )
    module_type = DynamicModelChoiceField(
        label=_('Module type'),
        queryset=ModuleType.objects.all(),
        context={
            'parent': 'manufacturer',
        },
        selector=True
    )
    comments = CommentField()
    replicate_components = forms.BooleanField(
        label=_('Replicate components'),
        required=False,
        initial=True,
        help_text=_("Automatically populate components associated with this module type")
    )
    adopt_components = forms.BooleanField(
        label=_('Adopt components'),
        required=False,
        initial=False,
        help_text=_("Adopt already existing components")
    )

    fieldsets = (
        FieldSet('device', 'module_bay', 'module_type', 'status', 'description', 'tags', name=_('Module')),
        FieldSet('serial', 'asset_tag', 'replicate_components', 'adopt_components', name=_('Hardware')),
    )

    class Meta:
        model = Module
        fields = [
            'device', 'module_bay', 'module_type', 'status', 'serial', 'asset_tag', 'tags', 'replicate_components',
            'adopt_components', 'description', 'comments',
        ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        if self.instance.pk:
            self.fields['device'].disabled = True
            self.fields['replicate_components'].initial = False
            self.fields['replicate_components'].disabled = True
            self.fields['adopt_components'].initial = False
            self.fields['adopt_components'].disabled = True


def get_termination_type_choices():
    return add_blank_choice([
        (f'{ct.app_label}.{ct.model}', ct.model_class()._meta.verbose_name.title())
        for ct in ContentType.objects.filter(CABLE_TERMINATION_MODELS)
    ])


class CableForm(TenancyForm, NetBoxModelForm):
    a_terminations_type = forms.ChoiceField(
        choices=get_termination_type_choices,
        required=False,
        widget=HTMXSelect(),
        label=_('Type')
    )
    b_terminations_type = forms.ChoiceField(
        choices=get_termination_type_choices,
        required=False,
        widget=HTMXSelect(),
        label=_('Type')
    )
    comments = CommentField()

    class Meta:
        model = Cable
        fields = [
            'a_terminations_type', 'b_terminations_type', 'type', 'status', 'tenant_group', 'tenant', 'label', 'color',
            'length', 'length_unit', 'description', 'comments', 'tags',
        ]


class PowerPanelForm(NetBoxModelForm):
    site = DynamicModelChoiceField(
        label=_('Site'),
        queryset=Site.objects.all(),
        selector=True
    )
    location = DynamicModelChoiceField(
        label=_('Location'),
        queryset=Location.objects.all(),
        required=False,
        query_params={
            'site_id': '$site'
        }
    )
    comments = CommentField()

    fieldsets = (
        FieldSet('site', 'location', 'name', 'description', 'tags', name=_('Power Panel')),
    )

    class Meta:
        model = PowerPanel
        fields = [
            'site', 'location', 'name', 'description', 'comments', 'tags',
        ]


class PowerFeedForm(TenancyForm, NetBoxModelForm):
    power_panel = DynamicModelChoiceField(
        label=_('Power panel'),
        queryset=PowerPanel.objects.all(),
        selector=True,
        quick_add=True
    )
    rack = DynamicModelChoiceField(
        label=_('Rack'),
        queryset=Rack.objects.all(),
        required=False,
        selector=True
    )
    comments = CommentField()

    fieldsets = (
        FieldSet(
            'power_panel', 'rack', 'name', 'status', 'type', 'description', 'mark_connected', 'tags',
            name=_('Power Feed')
        ),
        FieldSet('supply', 'voltage', 'amperage', 'phase', 'max_utilization', name=_('Characteristics')),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy')),
    )

    class Meta:
        model = PowerFeed
        fields = [
            'power_panel', 'rack', 'name', 'status', 'type', 'mark_connected', 'supply', 'phase', 'voltage', 'amperage',
            'max_utilization', 'tenant_group', 'tenant', 'description', 'comments', 'tags'
        ]


#
# Virtual chassis
#

class VirtualChassisForm(NetBoxModelForm):
    master = forms.ModelChoiceField(
        label=_('Master'),
        queryset=Device.objects.all(),
        required=False,
    )
    comments = CommentField()

    class Meta:
        model = VirtualChassis
        fields = [
            'name', 'domain', 'master', 'description', 'comments', 'tags',
        ]
        widgets = {
            'master': SelectWithPK(),
        }

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.fields['master'].queryset = Device.objects.filter(virtual_chassis=self.instance)


class DeviceVCMembershipForm(forms.ModelForm):
    class Meta:
        model = Device
        fields = [
            'vc_position', 'vc_priority',
        ]
        labels = {
            'vc_position': 'Position',
            'vc_priority': 'Priority',
        }

    def __init__(self, validate_vc_position=False, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Require VC position (only required when the Device is a VirtualChassis member)
        self.fields['vc_position'].required = True

        # Add bootstrap classes to form elements.
        self.fields['vc_position'].widget.attrs = {'class': 'form-control'}
        self.fields['vc_priority'].widget.attrs = {'class': 'form-control'}

        # Validation of vc_position is optional. This is only required when adding a new member to an existing
        # VirtualChassis. Otherwise, vc_position validation is handled by BaseVCMemberFormSet.
        self.validate_vc_position = validate_vc_position

    def clean_vc_position(self):
        vc_position = self.cleaned_data['vc_position']

        if self.validate_vc_position:
            conflicting_members = Device.objects.filter(
                virtual_chassis=self.instance.virtual_chassis,
                vc_position=vc_position
            )
            if conflicting_members.exists():
                raise forms.ValidationError(
                    'A virtual chassis member already exists in position {}.'.format(vc_position)
                )

        return vc_position


class VCMemberSelectForm(forms.Form):
    device = DynamicModelChoiceField(
        label=_('Device'),
        queryset=Device.objects.all(),
        query_params={
            'virtual_chassis_id': 'null',
        },
        selector=True
    )

    def clean_device(self):
        device = self.cleaned_data['device']
        if device.virtual_chassis is not None:
            raise forms.ValidationError(
                f"Device {device} is already assigned to a virtual chassis."
            )
        return device


#
# Device component templates
#

class ComponentTemplateForm(forms.ModelForm):
    device_type = DynamicModelChoiceField(
        label=_('Device type'),
        queryset=DeviceType.objects.all(),
        context={
            'parent': 'manufacturer',
        }
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Disable reassignment of DeviceType when editing an existing instance
        if self.instance.pk:
            self.fields['device_type'].disabled = True


class ModularComponentTemplateForm(ComponentTemplateForm):
    device_type = DynamicModelChoiceField(
        label=_('Device type'),
        queryset=DeviceType.objects.all().all(),
        required=False,
        context={
            'parent': 'manufacturer',
        }
    )
    module_type = DynamicModelChoiceField(
        label=_('Module type'),
        queryset=ModuleType.objects.all(),
        required=False,
        context={
            'parent': 'manufacturer',
        }
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Disable reassignment of ModuleType when editing an existing instance
        if self.instance.pk:
            self.fields['module_type'].disabled = True

        # Components attached to a module need to present this standardized substitution help text.
        self.fields['name'].help_text = _(
            "Alphanumeric ranges are supported for bulk creation. Mixed cases and types within a single range are not "
            "supported (example: <code>[ge,xe]-0/0/[0-9]</code>). The token <code>{module}</code>, if present, will be "
            "automatically replaced with the position value when creating a new module."
        )


class ConsolePortTemplateForm(ModularComponentTemplateForm):
    fieldsets = (
        FieldSet('device_type', 'module_type', 'name', 'label', 'type', 'description'),
    )

    class Meta:
        model = ConsolePortTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'description',
        ]


class ConsoleServerPortTemplateForm(ModularComponentTemplateForm):
    fieldsets = (
        FieldSet('device_type', 'module_type', 'name', 'label', 'type', 'description'),
    )

    class Meta:
        model = ConsoleServerPortTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'description',
        ]


class PowerPortTemplateForm(ModularComponentTemplateForm):
    fieldsets = (
        FieldSet(
            'device_type', 'module_type', 'name', 'label', 'type', 'maximum_draw', 'allocated_draw', 'description',
        ),
    )

    class Meta:
        model = PowerPortTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'maximum_draw', 'allocated_draw', 'description',
        ]


class PowerOutletTemplateForm(ModularComponentTemplateForm):
    power_port = DynamicModelChoiceField(
        label=_('Power port'),
        queryset=PowerPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type',
        }
    )

    fieldsets = (
        FieldSet('device_type', 'module_type', 'name', 'label', 'type', 'power_port', 'feed_leg', 'description'),
    )

    class Meta:
        model = PowerOutletTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'power_port', 'feed_leg', 'description',
        ]


class InterfaceTemplateForm(ModularComponentTemplateForm):
    bridge = DynamicModelChoiceField(
        label=_('Bridge'),
        queryset=InterfaceTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type',
            'module_type_id': '$module_type',
        }
    )

    fieldsets = (
        FieldSet(
            'device_type', 'module_type', 'name', 'label', 'type', 'enabled', 'mgmt_only', 'description', 'bridge',
        ),
        FieldSet('poe_mode', 'poe_type', name=_('PoE')),
        FieldSet('rf_role', name=_('Wireless')),
    )

    class Meta:
        model = InterfaceTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'mgmt_only', 'enabled', 'description', 'poe_mode',
            'poe_type', 'bridge', 'rf_role',
        ]


class FrontPortTemplateForm(ModularComponentTemplateForm):
    rear_port = DynamicModelChoiceField(
        label=_('Rear port'),
        queryset=RearPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type',
            'module_type_id': '$module_type',
        }
    )

    fieldsets = (
        FieldSet(
            'device_type', 'module_type', 'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position',
            'description',
        ),
    )

    class Meta:
        model = FrontPortTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position',
            'description',
        ]


class RearPortTemplateForm(ModularComponentTemplateForm):
    fieldsets = (
        FieldSet('device_type', 'module_type', 'name', 'label', 'type', 'color', 'positions', 'description'),
    )

    class Meta:
        model = RearPortTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'type', 'color', 'positions', 'description',
        ]


class ModuleBayTemplateForm(ModularComponentTemplateForm):
    fieldsets = (
        FieldSet('device_type', 'module_type', 'name', 'label', 'position', 'description'),
    )

    class Meta:
        model = ModuleBayTemplate
        fields = [
            'device_type', 'module_type', 'name', 'label', 'position', 'description',
        ]


class DeviceBayTemplateForm(ComponentTemplateForm):
    fieldsets = (
        FieldSet('device_type', 'name', 'label', 'description'),
    )

    class Meta:
        model = DeviceBayTemplate
        fields = [
            'device_type', 'name', 'label', 'description',
        ]


class InventoryItemTemplateForm(ComponentTemplateForm):
    parent = DynamicModelChoiceField(
        label=_('Parent'),
        queryset=InventoryItemTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        }
    )
    role = DynamicModelChoiceField(
        label=_('Role'),
        queryset=InventoryItemRole.objects.all(),
        required=False
    )
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all(),
        required=False
    )

    # Assigned component selectors
    consoleporttemplate = DynamicModelChoiceField(
        queryset=ConsolePortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Console port template')
    )
    consoleserverporttemplate = DynamicModelChoiceField(
        queryset=ConsoleServerPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Console server port template')
    )
    frontporttemplate = DynamicModelChoiceField(
        queryset=FrontPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Front port template')
    )
    interfacetemplate = DynamicModelChoiceField(
        queryset=InterfaceTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Interface template')
    )
    poweroutlettemplate = DynamicModelChoiceField(
        queryset=PowerOutletTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Power outlet template')
    )
    powerporttemplate = DynamicModelChoiceField(
        queryset=PowerPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Power port template')
    )
    rearporttemplate = DynamicModelChoiceField(
        queryset=RearPortTemplate.objects.all(),
        required=False,
        query_params={
            'device_type_id': '$device_type'
        },
        label=_('Rear port template')
    )

    fieldsets = (
        FieldSet(
            'device_type', 'parent', 'name', 'label', 'role', 'manufacturer', 'part_id', 'description',
        ),
        FieldSet(
            TabbedGroups(
                FieldSet('interfacetemplate', name=_('Interface')),
                FieldSet('consoleporttemplate', name=_('Console Port')),
                FieldSet('consoleserverporttemplate', name=_('Console Server Port')),
                FieldSet('frontporttemplate', name=_('Front Port')),
                FieldSet('rearporttemplate', name=_('Rear Port')),
                FieldSet('powerporttemplate', name=_('Power Port')),
                FieldSet('poweroutlettemplate', name=_('Power Outlet')),
            ),
            name=_('Component Assignment')
        )
    )

    class Meta:
        model = InventoryItemTemplate
        fields = [
            'device_type', 'parent', 'name', 'label', 'role', 'manufacturer', 'part_id', 'description',
        ]

    def __init__(self, *args, **kwargs):
        instance = kwargs.get('instance')
        initial = kwargs.get('initial', {}).copy()
        component_type = initial.get('component_type')
        component_id = initial.get('component_id')

        if instance:
            # When editing set the initial value for component selection
            for component_model in ContentType.objects.filter(MODULAR_COMPONENT_TEMPLATE_MODELS):
                if type(instance.component) is component_model.model_class():
                    initial[component_model.model] = instance.component
                    break
        elif component_type and component_id:
            # When adding the InventoryItem from a component page
            content_type = ContentType.objects.filter(
                MODULAR_COMPONENT_TEMPLATE_MODELS
            ).filter(pk=component_type).first()
            if content_type:
                if component := content_type.model_class().objects.filter(pk=component_id).first():
                    initial[content_type.model] = component

        kwargs['initial'] = initial

        super().__init__(*args, **kwargs)

    def clean(self):
        super().clean()

        # Handle object assignment
        selected_objects = [
            field for field in (
                'consoleporttemplate', 'consoleserverporttemplate', 'frontporttemplate', 'interfacetemplate',
                'poweroutlettemplate', 'powerporttemplate', 'rearporttemplate'
            ) if self.cleaned_data[field]
        ]
        if len(selected_objects) > 1:
            raise forms.ValidationError(_("An InventoryItem can only be assigned to a single component."))
        elif selected_objects:
            self.instance.component = self.cleaned_data[selected_objects[0]]
        else:
            self.instance.component = None


#
# Device components
#

class DeviceComponentForm(NetBoxModelForm):
    device = DynamicModelChoiceField(
        label=_('Device'),
        queryset=Device.objects.all(),
        selector=True
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Disable reassignment of Device when editing an existing instance
        if self.instance.pk:
            self.fields['device'].disabled = True


class ModularDeviceComponentForm(DeviceComponentForm):
    module = DynamicModelChoiceField(
        label=_('Module'),
        queryset=Module.objects.all(),
        required=False,
        query_params={
            'device_id': '$device',
        }
    )


class ConsolePortForm(ModularDeviceComponentForm):
    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'speed', 'mark_connected', 'description', 'tags',
        ),
    )

    class Meta:
        model = ConsolePort
        fields = [
            'device', 'module', 'name', 'label', 'type', 'speed', 'mark_connected', 'description', 'tags',
        ]


class ConsoleServerPortForm(ModularDeviceComponentForm):
    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'speed', 'mark_connected', 'description', 'tags',
        ),
    )

    class Meta:
        model = ConsoleServerPort
        fields = [
            'device', 'module', 'name', 'label', 'type', 'speed', 'mark_connected', 'description', 'tags',
        ]


class PowerPortForm(ModularDeviceComponentForm):
    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'maximum_draw', 'allocated_draw', 'mark_connected',
            'description', 'tags',
        ),
    )

    class Meta:
        model = PowerPort
        fields = [
            'device', 'module', 'name', 'label', 'type', 'maximum_draw', 'allocated_draw', 'mark_connected',
            'description', 'tags',
        ]


class PowerOutletForm(ModularDeviceComponentForm):
    power_port = DynamicModelChoiceField(
        label=_('Power port'),
        queryset=PowerPort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device',
        }
    )

    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'color', 'power_port', 'feed_leg', 'mark_connected',
            'description', 'tags',
        ),
    )

    class Meta:
        model = PowerOutlet
        fields = [
            'device', 'module', 'name', 'label', 'type', 'color', 'power_port', 'feed_leg', 'mark_connected',
            'description', 'tags',
        ]


class InterfaceForm(InterfaceCommonForm, ModularDeviceComponentForm):
    vdcs = DynamicModelMultipleChoiceField(
        queryset=VirtualDeviceContext.objects.all(),
        required=False,
        label=_('Virtual device contexts'),
        initial_params={
            'interfaces': '$parent',
        },
        query_params={
            'device_id': '$device',
        }
    )
    parent = DynamicModelChoiceField(
        queryset=Interface.objects.all(),
        required=False,
        label=_('Parent interface'),
        query_params={
            'virtual_chassis_member_id': '$device',
        }
    )
    bridge = DynamicModelChoiceField(
        queryset=Interface.objects.all(),
        required=False,
        label=_('Bridged interface'),
        query_params={
            'virtual_chassis_member_id': '$device',
        }
    )
    lag = DynamicModelChoiceField(
        queryset=Interface.objects.all(),
        required=False,
        label=_('LAG interface'),
        query_params={
            'virtual_chassis_member_id': '$device',
            'type': 'lag',
        }
    )
    wireless_lan_group = DynamicModelChoiceField(
        queryset=WirelessLANGroup.objects.all(),
        required=False,
        label=_('Wireless LAN group')
    )
    wireless_lans = DynamicModelMultipleChoiceField(
        queryset=WirelessLAN.objects.all(),
        required=False,
        label=_('Wireless LANs'),
        query_params={
            'group_id': '$wireless_lan_group',
        }
    )
    vlan_group = DynamicModelChoiceField(
        queryset=VLANGroup.objects.all(),
        required=False,
        label=_('VLAN group'),
        help_text=_("Filter VLANs available for assignment by group.")
    )
    untagged_vlan = DynamicModelChoiceField(
        queryset=VLAN.objects.all(),
        required=False,
        label=_('Untagged VLAN'),
        query_params={
            'group_id': '$vlan_group',
            'available_on_device': '$device',
        }
    )
    tagged_vlans = DynamicModelMultipleChoiceField(
        queryset=VLAN.objects.all(),
        required=False,
        label=_('Tagged VLANs'),
        query_params={
            'group_id': '$vlan_group',
            'available_on_device': '$device',
        }
    )
    qinq_svlan = DynamicModelChoiceField(
        queryset=VLAN.objects.all(),
        required=False,
        label=_('Q-in-Q Service VLAN'),
        query_params={
            'group_id': '$vlan_group',
            'available_on_device': '$device',
            'qinq_role': VLANQinQRoleChoices.ROLE_SERVICE,
        }
    )
    vrf = DynamicModelChoiceField(
        queryset=VRF.objects.all(),
        required=False,
        label=_('VRF')
    )
    primary_mac_address = DynamicModelChoiceField(
        queryset=MACAddress.objects.all(),
        label=_('Primary MAC address'),
        required=False,
        quick_add=True,
        quick_add_params={'interface': '$pk'}
    )
    wwn = forms.CharField(
        empty_value=None,
        required=False,
        label=_('WWN')
    )
    vlan_translation_policy = DynamicModelChoiceField(
        queryset=VLANTranslationPolicy.objects.all(),
        required=False,
        label=_('VLAN Translation Policy')
    )

    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'speed', 'duplex', 'description', 'tags', name=_('Interface')
        ),
        FieldSet('vrf', 'primary_mac_address', 'wwn', name=_('Addressing')),
        FieldSet('vdcs', 'mtu', 'tx_power', 'enabled', 'mgmt_only', 'mark_connected', name=_('Operation')),
        FieldSet('parent', 'bridge', 'lag', name=_('Related Interfaces')),
        FieldSet('poe_mode', 'poe_type', name=_('PoE')),
        FieldSet(
            'mode', 'vlan_group', 'untagged_vlan', 'tagged_vlans', 'qinq_svlan', 'vlan_translation_policy',
            name=_('802.1Q Switching')
        ),
        FieldSet(
            'rf_role', 'rf_channel', 'rf_channel_frequency', 'rf_channel_width', 'wireless_lan_group', 'wireless_lans',
            name=_('Wireless')
        ),
    )

    class Meta:
        model = Interface
        fields = [
            'device', 'module', 'vdcs', 'name', 'label', 'type', 'speed', 'duplex', 'enabled', 'parent', 'bridge',
            'lag', 'wwn', 'mtu', 'mgmt_only', 'mark_connected', 'description', 'poe_mode', 'poe_type', 'mode',
            'rf_role', 'rf_channel', 'rf_channel_frequency', 'rf_channel_width', 'tx_power', 'wireless_lans',
            'untagged_vlan', 'tagged_vlans', 'qinq_svlan', 'vlan_translation_policy', 'vrf', 'primary_mac_address',
            'tags',
        ]
        widgets = {
            'speed': NumberWithOptions(
                options=InterfaceSpeedChoices
            ),
            'mode': HTMXSelect(),
        }
        labels = {
            'mode': '802.1Q Mode',
        }


class FrontPortForm(ModularDeviceComponentForm):
    rear_port = DynamicModelChoiceField(
        queryset=RearPort.objects.all(),
        query_params={
            'device_id': '$device',
        }
    )

    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position', 'mark_connected',
            'description', 'tags',
        ),
    )

    class Meta:
        model = FrontPort
        fields = [
            'device', 'module', 'name', 'label', 'type', 'color', 'rear_port', 'rear_port_position', 'mark_connected',
            'description', 'tags',
        ]


class RearPortForm(ModularDeviceComponentForm):
    fieldsets = (
        FieldSet(
            'device', 'module', 'name', 'label', 'type', 'color', 'positions', 'mark_connected', 'description', 'tags',
        ),
    )

    class Meta:
        model = RearPort
        fields = [
            'device', 'module', 'name', 'label', 'type', 'color', 'positions', 'mark_connected', 'description', 'tags',
        ]


class ModuleBayForm(ModularDeviceComponentForm):
    fieldsets = (
        FieldSet('device', 'module', 'name', 'label', 'position', 'description', 'tags',),
    )

    class Meta:
        model = ModuleBay
        fields = [
            'device', 'module', 'name', 'label', 'position', 'description', 'tags',
        ]


class DeviceBayForm(DeviceComponentForm):
    fieldsets = (
        FieldSet('device', 'name', 'label', 'description', 'tags',),
    )

    class Meta:
        model = DeviceBay
        fields = [
            'device', 'name', 'label', 'description', 'tags',
        ]


class PopulateDeviceBayForm(forms.Form):
    installed_device = forms.ModelChoiceField(
        queryset=Device.objects.all(),
        label=_('Child Device'),
        help_text=_("Child devices must first be created and assigned to the site and rack of the parent device.")
    )

    def __init__(self, device_bay, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.fields['installed_device'].queryset = Device.objects.filter(
            site=device_bay.device.site,
            rack=device_bay.device.rack,
            parent_bay__isnull=True,
            device_type__u_height=0,
            device_type__subdevice_role=SubdeviceRoleChoices.ROLE_CHILD
        ).exclude(pk=device_bay.device.pk)


class InventoryItemForm(DeviceComponentForm):
    parent = DynamicModelChoiceField(
        label=_('Parent'),
        queryset=InventoryItem.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        }
    )
    role = DynamicModelChoiceField(
        label=_('Role'),
        queryset=InventoryItemRole.objects.all(),
        required=False
    )
    manufacturer = DynamicModelChoiceField(
        label=_('Manufacturer'),
        queryset=Manufacturer.objects.all(),
        required=False
    )

    # Assigned component selectors
    consoleport = DynamicModelChoiceField(
        queryset=ConsolePort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Console port')
    )
    consoleserverport = DynamicModelChoiceField(
        queryset=ConsoleServerPort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Console server port')
    )
    frontport = DynamicModelChoiceField(
        queryset=FrontPort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Front port')
    )
    interface = DynamicModelChoiceField(
        queryset=Interface.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Interface')
    )
    poweroutlet = DynamicModelChoiceField(
        queryset=PowerOutlet.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Power outlet')
    )
    powerport = DynamicModelChoiceField(
        queryset=PowerPort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Power port')
    )
    rearport = DynamicModelChoiceField(
        queryset=RearPort.objects.all(),
        required=False,
        query_params={
            'device_id': '$device'
        },
        label=_('Rear port')
    )

    fieldsets = (
        FieldSet(
            'device', 'parent', 'name', 'label', 'status', 'role', 'description', 'tags',
            name=_('Inventory Item')
        ),
        FieldSet('manufacturer', 'part_id', 'serial', 'asset_tag', name=_('Hardware')),
        FieldSet(
            TabbedGroups(
                FieldSet('interface', name=_('Interface')),
                FieldSet('consoleport', name=_('Console Port')),
                FieldSet('consoleserverport', name=_('Console Server Port')),
                FieldSet('frontport', name=_('Front Port')),
                FieldSet('rearport', name=_('Rear Port')),
                FieldSet('powerport', name=_('Power Port')),
                FieldSet('poweroutlet', name=_('Power Outlet')),
            ),
            name=_('Component Assignment')
        )
    )

    class Meta:
        model = InventoryItem
        fields = [
            'device', 'parent', 'name', 'label', 'role', 'manufacturer', 'part_id', 'serial', 'asset_tag',
            'status', 'description', 'tags',
        ]

    def __init__(self, *args, **kwargs):
        instance = kwargs.get('instance')
        initial = kwargs.get('initial', {}).copy()
        component_type = initial.get('component_type')
        component_id = initial.get('component_id')

        if instance:
            # When editing set the initial value for component selection
            for component_model in ContentType.objects.filter(MODULAR_COMPONENT_MODELS):
                if type(instance.component) is component_model.model_class():
                    initial[component_model.model] = instance.component
                    break
        elif component_type and component_id:
            # When adding the InventoryItem from a component page
            if content_type := ContentType.objects.filter(MODULAR_COMPONENT_MODELS).filter(pk=component_type).first():
                if component := content_type.model_class().objects.filter(pk=component_id).first():
                    initial[content_type.model] = component

        kwargs['initial'] = initial

        super().__init__(*args, **kwargs)

        # Specifically allow editing the device of IntentoryItems
        if self.instance.pk:
            self.fields['device'].disabled = False

    def clean(self):
        super().clean()

        # Handle object assignment
        selected_objects = [
            field for field in (
                'consoleport', 'consoleserverport', 'frontport', 'interface', 'poweroutlet', 'powerport', 'rearport'
            ) if self.cleaned_data[field]
        ]
        if len(selected_objects) > 1:
            raise forms.ValidationError(_("An InventoryItem can only be assigned to a single component."))
        elif selected_objects:
            self.instance.component = self.cleaned_data[selected_objects[0]]
        else:
            self.instance.component = None


# Device component roles
#

class InventoryItemRoleForm(NetBoxModelForm):
    slug = SlugField()

    fieldsets = (
        FieldSet('name', 'slug', 'color', 'description', 'tags', name=_('Inventory Item Role')),
    )

    class Meta:
        model = InventoryItemRole
        fields = [
            'name', 'slug', 'color', 'description', 'tags',
        ]


class VirtualDeviceContextForm(TenancyForm, NetBoxModelForm):
    device = DynamicModelChoiceField(
        label=_('Device'),
        queryset=Device.objects.all(),
        selector=True
    )
    primary_ip4 = DynamicModelChoiceField(
        queryset=IPAddress.objects.all(),
        label=_('Primary IPv4'),
        required=False,
        query_params={
            'device_id': '$device',
            'family': '4',
        }
    )
    primary_ip6 = DynamicModelChoiceField(
        queryset=IPAddress.objects.all(),
        label=_('Primary IPv6'),
        required=False,
        query_params={
            'device_id': '$device',
            'family': '6',
        }
    )

    fieldsets = (
        FieldSet(
            'device', 'name', 'status', 'identifier', 'primary_ip4', 'primary_ip6', 'tags',
            name=_('Virtual Device Context')
        ),
        FieldSet('tenant_group', 'tenant', name=_('Tenancy'))
    )

    class Meta:
        model = VirtualDeviceContext
        fields = [
            'device', 'name', 'status', 'identifier', 'primary_ip4', 'primary_ip6', 'tenant_group', 'tenant',
            'comments', 'tags'
        ]


#
# Addressing
#

class MACAddressForm(NetBoxModelForm):
    mac_address = forms.CharField(
        required=True,
        label=_('MAC address')
    )
    interface = DynamicModelChoiceField(
        label=_('Interface'),
        queryset=Interface.objects.all(),
        required=False,
        context={
            'parent': 'device',
        },
    )
    vminterface = DynamicModelChoiceField(
        label=_('VM Interface'),
        queryset=VMInterface.objects.all(),
        required=False,
        context={
            'parent': 'virtual_machine',
        },
    )

    fieldsets = (
        FieldSet(
            'mac_address', 'description', 'tags',
        ),
        FieldSet(
            TabbedGroups(
                FieldSet('interface', name=_('Device')),
                FieldSet('vminterface', name=_('Virtual Machine')),
            ),
        ),
    )

    class Meta:
        model = MACAddress
        fields = [
            'mac_address', 'interface', 'vminterface', 'description', 'tags',
        ]

    def __init__(self, *args, **kwargs):

        # Initialize helper selectors
        instance = kwargs.get('instance')
        initial = kwargs.get('initial', {}).copy()
        if instance:
            if type(instance.assigned_object) is Interface:
                initial['interface'] = instance.assigned_object
            elif type(instance.assigned_object) is VMInterface:
                initial['vminterface'] = instance.assigned_object
        kwargs['initial'] = initial

        super().__init__(*args, **kwargs)

        if instance and instance.assigned_object and instance.assigned_object.primary_mac_address:
            if instance.assigned_object.primary_mac_address.pk == instance.pk:
                self.fields['interface'].disabled = True
                self.fields['vminterface'].disabled = True

    def clean(self):
        super().clean()

        # Handle object assignment
        selected_objects = [
            field for field in ('interface', 'vminterface') if self.cleaned_data[field]
        ]
        if len(selected_objects) > 1:
            raise forms.ValidationError({
                selected_objects[1]: _("A MAC address can only be assigned to a single object.")
            })
        elif selected_objects:
            self.instance.assigned_object = self.cleaned_data[selected_objects[0]]
        else:
            self.instance.assigned_object = None