from django.db.models import F
from django.utils.translation import ugettext_lazy as _
from rest_framework import serializers

from orgs.mixins.serializers import BulkOrgResourceModelSerializer
from common.drf.serializers import SecretReadableMixin
from assets.models import Account, AccountTemplate
from assets.serializers.base import AuthValidateMixin
from .common import AccountFieldsSerializerMixin


class AccountSerializerCreateMixin(serializers.ModelSerializer):
    template = serializers.UUIDField(
        required=False, allow_null=True, write_only=True,
        label=_('Account template')
    )
    push_now = serializers.BooleanField(
        default=False, label=_("Push now"), write_only=True
    )

    @staticmethod
    def validate_template(value):
        AccountTemplate.objects.get_or_create()
        model = AccountTemplate
        try:
            return model.objects.get(id=value)
        except AccountTemplate.DoesNotExist:
            raise serializers.ValidationError(_('Account template not found'))

    @staticmethod
    def replace_attrs(account_template: AccountTemplate, attrs: dict):
        exclude_fields = [
            '_state', 'org_id', 'date_verified', 'id',
            'date_created', 'date_updated', 'created_by'
        ]
        template_attrs = {k: v for k, v in account_template.__dict__.items() if k not in exclude_fields}
        for k, v in template_attrs.items():
            attrs.setdefault(k, v)

    def validate(self, attrs):
        account_template = attrs.pop('template', None)
        if account_template:
            self.replace_attrs(account_template, attrs)
        self.push_now = attrs.pop('push_now', False)
        return super().validate(attrs)

    def create(self, validated_data):
        instance = super().create(validated_data)
        if self.push_now:
            print("Start push account to asset")
            # Todo: push it
            pass
        return instance


class AccountSerializer(AuthValidateMixin,
                        AccountSerializerCreateMixin,
                        AccountFieldsSerializerMixin,
                        BulkOrgResourceModelSerializer):
    name = serializers.CharField(max_length=128, read_only=True, label=_("Name"))
    ip = serializers.ReadOnlyField(label=_("IP"))
    asset_name = serializers.ReadOnlyField(label=_("Asset"))
    platform = serializers.ReadOnlyField(label=_("Platform"))

    class Meta(AccountFieldsSerializerMixin.Meta):
        model = Account
        fields = AccountFieldsSerializerMixin.Meta.fields \
            + ['template', 'push_now']

    @classmethod
    def setup_eager_loading(cls, queryset):
        """ Perform necessary eager loading of data. """
        queryset = queryset.prefetch_related('asset') \
            .annotate(ip=F('asset__ip')) \
            .annotate(asset_name=F('asset__name'))
        return queryset


class AccountSecretSerializer(SecretReadableMixin, AccountSerializer):
    class Meta(AccountSerializer.Meta):
        fields_backup = [
            'name', 'ip', 'platform', 'protocols', 'username', 'password',
            'private_key', 'public_key', 'date_created', 'date_updated', 'version'
        ]
        extra_kwargs = {
            'password': {'write_only': False},
            'private_key': {'write_only': False},
            'public_key': {'write_only': False},
        }


class AccountTaskSerializer(serializers.Serializer):
    ACTION_CHOICES = (
        ('test', 'test'),
    )
    action = serializers.ChoiceField(choices=ACTION_CHOICES, write_only=True)
    task = serializers.CharField(read_only=True)