from rest_framework import serializers

from dcim.models import DeviceRole, InventoryItemRole
from extras.api.serializers_.configtemplates import ConfigTemplateSerializer
from netbox.api.fields import RelatedObjectCountField
from netbox.api.serializers import NestedGroupModelSerializer, NetBoxModelSerializer
from .nested import NestedDeviceRoleSerializer

__all__ = (
    'DeviceRoleSerializer',
    'InventoryItemRoleSerializer',
)


class DeviceRoleSerializer(NestedGroupModelSerializer):
    parent = NestedDeviceRoleSerializer(required=False, allow_null=True, default=None)
    config_template = ConfigTemplateSerializer(nested=True, required=False, allow_null=True, default=None)
    device_count = serializers.IntegerField(read_only=True, default=0)
    virtualmachine_count = serializers.IntegerField(read_only=True, default=0)

    class Meta:
        model = DeviceRole
        fields = [
            'id', 'url', 'display_url', 'display', 'name', 'slug', 'color', 'vm_role', 'config_template', 'parent',
            'description', 'tags', 'custom_fields', 'created', 'last_updated', 'device_count', 'virtualmachine_count',
            'comments', '_depth',
        ]
        brief_fields = (
            'id', 'url', 'display', 'name', 'slug', 'description', 'device_count', 'virtualmachine_count', '_depth'
        )


class InventoryItemRoleSerializer(NetBoxModelSerializer):

    # Related object counts
    inventoryitem_count = RelatedObjectCountField('inventory_items')

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