from django.utils.translation import gettext as _
from rest_framework import serializers

from dcim.choices import *
from dcim.constants import *
from dcim.models import Rack, RackReservation, RackRole, RackType
from netbox.api.fields import ChoiceField, RelatedObjectCountField
from netbox.api.serializers import NetBoxModelSerializer
from netbox.config import ConfigItem
from tenancy.api.serializers_.tenants import TenantSerializer
from users.api.serializers_.users import UserSerializer
from .manufacturers import ManufacturerSerializer
from .sites import LocationSerializer, SiteSerializer

__all__ = (
    'RackElevationDetailFilterSerializer',
    'RackReservationSerializer',
    'RackRoleSerializer',
    'RackSerializer',
    'RackTypeSerializer',
)


class RackRoleSerializer(NetBoxModelSerializer):

    # Related object counts
    rack_count = RelatedObjectCountField('racks')

    class Meta:
        model = RackRole
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'description', 'tags', 'custom_fields',
            'created', 'last_updated', 'rack_count',
        ]
        brief_fields = ('id', 'url', 'display', 'name', 'slug', 'description', 'rack_count')


class RackBaseSerializer(NetBoxModelSerializer):
    form_factor = ChoiceField(
        choices=RackFormFactorChoices,
        allow_blank=True,
        required=False,
        allow_null=True
    )
    width = ChoiceField(
        choices=RackWidthChoices,
        required=False
    )
    outer_unit = ChoiceField(
        choices=RackDimensionUnitChoices,
        allow_blank=True,
        required=False,
        allow_null=True
    )
    weight_unit = ChoiceField(
        choices=WeightUnitChoices,
        allow_blank=True,
        required=False,
        allow_null=True
    )


class RackTypeSerializer(RackBaseSerializer):
    manufacturer = ManufacturerSerializer(
        nested=True
    )

    class Meta:
        model = RackType
        fields = [
            'id', 'url', 'display_url', 'display', 'manufacturer', 'model', 'slug', 'description', 'form_factor',
            'width', 'u_height', 'starting_unit', 'desc_units', 'outer_width', 'outer_depth', 'outer_unit', 'weight',
            'max_weight', 'weight_unit', 'mounting_depth', 'description', 'comments', 'tags',
            'custom_fields', 'created', 'last_updated',
        ]
        brief_fields = ('id', 'url', 'display', 'manufacturer', 'model', 'slug', 'description')


class RackSerializer(RackBaseSerializer):
    site = SiteSerializer(
        nested=True
    )
    location = LocationSerializer(
        nested=True,
        required=False,
        allow_null=True,
        default=None
    )
    tenant = TenantSerializer(
        nested=True,
        required=False,
        allow_null=True
    )
    status = ChoiceField(
        choices=RackStatusChoices,
        required=False
    )
    airflow = ChoiceField(
        choices=RackAirflowChoices,
        allow_blank=True,
        required=False
    )
    role = RackRoleSerializer(
        nested=True,
        required=False,
        allow_null=True
    )
    facility_id = serializers.CharField(
        max_length=50,
        allow_blank=True,
        allow_null=True,
        label=_('Facility ID'),
        default=None
    )
    rack_type = RackTypeSerializer(
        nested=True,
        required=False,
        allow_null=True,
        default=None
    )

    # Related object counts
    device_count = RelatedObjectCountField('devices')
    powerfeed_count = RelatedObjectCountField('powerfeeds')

    class Meta:
        model = Rack
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'facility_id', 'site', 'location', 'tenant', 'status',
            'role', 'serial', 'asset_tag', 'rack_type', 'form_factor', 'width', 'u_height', 'starting_unit', 'weight',
            'max_weight', 'weight_unit', 'desc_units', 'outer_width', 'outer_depth', 'outer_unit', 'mounting_depth',
            'airflow', 'description', 'comments', 'tags', 'custom_fields', 'created', 'last_updated', 'device_count',
            'powerfeed_count',
        ]
        brief_fields = ('id', 'url', 'display', 'name', 'description', 'device_count')


class RackReservationSerializer(NetBoxModelSerializer):
    rack = RackSerializer(nested=True)
    user = UserSerializer(nested=True)
    tenant = TenantSerializer(nested=True, required=False, allow_null=True)

    class Meta:
        model = RackReservation
        fields = [
            'id', 'url', 'display_url', 'display', 'rack', 'units', 'created', 'last_updated', 'user', 'tenant',
            'description', 'comments', 'tags', 'custom_fields',
        ]
        brief_fields = ('id', 'url', 'display', 'user', 'description', 'units')


class RackElevationDetailFilterSerializer(serializers.Serializer):
    q = serializers.CharField(
        required=False,
        default=None
    )
    face = serializers.ChoiceField(
        choices=DeviceFaceChoices,
        default=DeviceFaceChoices.FACE_FRONT
    )
    render = serializers.ChoiceField(
        choices=RackElevationDetailRenderChoices,
        default=RackElevationDetailRenderChoices.RENDER_JSON
    )
    unit_width = serializers.IntegerField(
        default=ConfigItem('RACK_ELEVATION_DEFAULT_UNIT_WIDTH')
    )
    unit_height = serializers.IntegerField(
        default=ConfigItem('RACK_ELEVATION_DEFAULT_UNIT_HEIGHT')
    )
    legend_width = serializers.IntegerField(
        default=RACK_ELEVATION_DEFAULT_LEGEND_WIDTH
    )
    margin_width = serializers.IntegerField(
        default=RACK_ELEVATION_DEFAULT_MARGIN_WIDTH
    )
    exclude = serializers.IntegerField(
        required=False,
        default=None
    )
    expand_devices = serializers.BooleanField(
        required=False,
        default=True
    )
    include_images = serializers.BooleanField(
        required=False,
        default=True
    )