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

from assets.models import Asset, Node
from perms.models import AssetPermission
from perms.serializers.permission import ActionChoicesField
from common.drf.fields import ObjectRelatedField
from tickets.models import ApplyAssetTicket
from .common import BaseApplyAssetSerializer
from .ticket import TicketApplySerializer

__all__ = ['ApplyAssetSerializer', 'ApproveAssetSerializer']

asset_or_node_help_text = _("Select at least one asset or node")


class ApplyAssetSerializer(BaseApplyAssetSerializer, TicketApplySerializer):
    apply_assets = ObjectRelatedField(queryset=Asset.objects, many=True, required=False, label=_('Apply assets'))
    apply_nodes = ObjectRelatedField(queryset=Node.objects, many=True, required=False, label=_('Apply nodes'))
    apply_actions = ActionChoicesField(required=False, allow_null=True, label=_("Apply actions"))
    permission_model = AssetPermission

    class Meta(TicketApplySerializer.Meta):
        model = ApplyAssetTicket
        writeable_fields = [
            'id', 'title', 'type', 'apply_nodes', 'apply_assets', 'apply_accounts',
            'apply_actions', 'apply_date_start', 'apply_date_expired',
            'comment', 'org_id'
        ]
        read_only_fields = TicketApplySerializer.Meta.read_only_fields + ['apply_permission_name', ]
        fields = TicketApplySerializer.Meta.fields_small + writeable_fields + read_only_fields
        ticket_extra_kwargs = TicketApplySerializer.Meta.extra_kwargs
        extra_kwargs = {
            'apply_accounts': {'required': False},
        }
        extra_kwargs.update(ticket_extra_kwargs)

    def validate_apply_nodes(self, nodes):
        return self.filter_many_to_many_field(Node, nodes)

    def validate_apply_assets(self, assets):
        return self.filter_many_to_many_field(Asset, assets)

    def validate(self, attrs):
        attrs['type'] = 'apply_asset'
        attrs = super().validate(attrs)
        if self.is_final_approval and (
                not attrs.get('apply_nodes') and not attrs.get('apply_assets')
        ):
            raise serializers.ValidationError({
                'apply_nodes': asset_or_node_help_text,
                'apply_assets': asset_or_node_help_text,
            })

        return attrs

    @classmethod
    def setup_eager_loading(cls, queryset):
        queryset = queryset.prefetch_related('apply_nodes', 'apply_assets')
        return queryset


class ApproveAssetSerializer(ApplyAssetSerializer):
    class Meta(ApplyAssetSerializer.Meta):
        read_only_fields = TicketApplySerializer.Meta.fields_small + \
                           ApplyAssetSerializer.Meta.read_only_fields