content: from django.utils.translation import gettext_lazy as _
  import django_tables2 as tables
  from django_tables2.utils import Accessor
  
  from dcim.models import Rack, RackReservation, RackRole, RackType
  from netbox.tables import NetBoxTable, columns
  from tenancy.tables import ContactsColumnMixin, TenancyColumnsMixin
  from .template_code import OUTER_UNIT, WEIGHT
  
  __all__ = (
      'RackTable',
      'RackReservationTable',
      'RackRoleTable',
      'RackTypeTable',
  )
  
  
  #
  # Rack roles
  #
  
  class RackRoleTable(NetBoxTable):
      name = tables.Column(
          verbose_name=_('Name'),
          linkify=True
      )
      rack_count = columns.LinkedCountColumn(
          viewname='dcim:rack_list',
          url_params={'role_id': 'pk'},
          verbose_name=_('Racks')
      )
      color = columns.ColorColumn(
          verbose_name=_('Color'),
      )
      tags = columns.TagColumn(
          url_name='dcim:rackrole_list'
      )
  
      class Meta(NetBoxTable.Meta):
          model = RackRole
          fields = (
              'pk', 'id', 'name', 'rack_count', 'color', 'description', 'slug', 'tags', 'actions', 'created',
              'last_updated',
          )
          default_columns = ('pk', 'name', 'rack_count', 'color', 'description')
  
  
  #
  # Rack Types
  #
  
  class RackTypeTable(NetBoxTable):
      model = tables.Column(
          verbose_name=_('Model'),
          linkify=True
      )
      manufacturer = tables.Column(
          verbose_name=_('Manufacturer'),
          linkify=True
      )
      u_height = tables.TemplateColumn(
          template_code="{{ value }}U",
          verbose_name=_('Height')
      )
      outer_width = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Width')
      )
      outer_height = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Height')
      )
      outer_depth = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Depth')
      )
      weight = columns.TemplateColumn(
          verbose_name=_('Weight'),
          template_code=WEIGHT,
          order_by=('_abs_weight', 'weight_unit')
      )
      max_weight = columns.TemplateColumn(
          verbose_name=_('Max Weight'),
          template_code=WEIGHT,
          order_by=('_abs_max_weight', 'weight_unit')
      )
      comments = columns.MarkdownColumn(
          verbose_name=_('Comments'),
      )
      instance_count = columns.LinkedCountColumn(
          viewname='dcim:rack_list',
          url_params={'rack_type_id': 'pk'},
          verbose_name=_('Instances')
      )
      tags = columns.TagColumn(
          url_name='dcim:rack_list'
      )
  
      class Meta(NetBoxTable.Meta):
          model = RackType
          fields = (
              'pk', 'id', 'model', 'manufacturer', 'form_factor', 'u_height', 'starting_unit', 'width', 'outer_width',
              'outer_height', 'outer_depth', 'mounting_depth', 'weight', 'max_weight', 'description',
              'comments', 'instance_count', 'tags', 'created', 'last_updated',
          )
          default_columns = (
              'pk', 'model', 'manufacturer', 'type', 'u_height', 'description', 'instance_count',
          )
  
  
  #
  # Racks
  #
  
  class RackTable(TenancyColumnsMixin, ContactsColumnMixin, NetBoxTable):
      name = tables.Column(
          verbose_name=_('Name'),
          linkify=True
      )
      location = tables.Column(
          verbose_name=_('Location'),
          linkify=True
      )
      site = tables.Column(
          verbose_name=_('Site'),
          linkify=True
      )
      status = columns.ChoiceFieldColumn(
          verbose_name=_('Status'),
      )
      role = columns.ColoredLabelColumn(
          verbose_name=_('Role'),
      )
      manufacturer = tables.Column(
          verbose_name=_('Manufacturer'),
          accessor=Accessor('rack_type__manufacturer'),
          linkify=True
      )
      rack_type = tables.Column(
          linkify=True,
          verbose_name=_('Type')
      )
      u_height = tables.TemplateColumn(
          template_code="{{ value }}U",
          verbose_name=_('Height')
      )
      comments = columns.MarkdownColumn(
          verbose_name=_('Comments'),
      )
      device_count = columns.LinkedCountColumn(
          viewname='dcim:device_list',
          url_params={'rack_id': 'pk'},
          verbose_name=_('Devices')
      )
      get_utilization = columns.UtilizationColumn(
          orderable=False,
          verbose_name=_('Space')
      )
      get_power_utilization = columns.UtilizationColumn(
          orderable=False,
          verbose_name=_('Power')
      )
      tags = columns.TagColumn(
          url_name='dcim:rack_list'
      )
      outer_width = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Width')
      )
      outer_height = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Height')
      )
      outer_depth = columns.TemplateColumn(
          template_code=OUTER_UNIT,
          verbose_name=_('Outer Depth')
      )
      weight = columns.TemplateColumn(
          verbose_name=_('Weight'),
          template_code=WEIGHT,
          order_by=('_abs_weight', 'weight_unit')
      )
      max_weight = columns.TemplateColumn(
          verbose_name=_('Max Weight'),
          template_code=WEIGHT,
          order_by=('_abs_max_weight', 'weight_unit')
      )
  
      class Meta(NetBoxTable.Meta):
          model = Rack
          fields = (
              'pk', 'id', 'name', 'site', 'location', 'status', 'facility_id', 'tenant', 'tenant_group', 'role',
              'rack_type', 'serial', 'asset_tag', 'form_factor', 'u_height', 'starting_unit', 'width', 'outer_width',
              'outer_height', 'outer_depth', 'mounting_depth', 'airflow', 'weight', 'max_weight', 'comments',
              'device_count', 'get_utilization', 'get_power_utilization', 'description', 'contacts',
              'tags', 'created', 'last_updated',
          )
          default_columns = (
              'pk', 'name', 'site', 'location', 'status', 'facility_id', 'tenant', 'role', 'rack_type', 'u_height',
              'device_count', 'get_utilization',
          )
  
  
  #
  # Rack reservations
  #
  
  class RackReservationTable(TenancyColumnsMixin, NetBoxTable):
      reservation = tables.Column(
          verbose_name=_('Reservation'),
          accessor='pk',
          linkify=True
      )
      site = tables.Column(
          verbose_name=_('Site'),
          accessor=Accessor('rack__site'),
          linkify=True
      )
      location = tables.Column(
          verbose_name=_('Location'),
          accessor=Accessor('rack__location'),
          linkify=True
      )
      rack = tables.Column(
          verbose_name=_('Rack'),
          linkify=True
      )
      unit_list = tables.Column(
          orderable=False,
          verbose_name=_('Units')
      )
      status = columns.ChoiceFieldColumn(
          verbose_name=_('Status'),
      )
      comments = columns.MarkdownColumn(
          verbose_name=_('Comments'),
      )
      tags = columns.TagColumn(
          url_name='dcim:rackreservation_list'
      )
  
      class Meta(NetBoxTable.Meta):
          model = RackReservation
          fields = (
              'pk', 'id', 'reservation', 'site', 'location', 'rack', 'unit_list', 'status', 'user', 'created', 'tenant',
              'tenant_group', 'description', 'comments', 'tags', 'actions', 'created', 'last_updated',
          )
          default_columns = ('pk', 'reservation', 'site', 'rack', 'unit_list', 'status', 'user', 'description')
  