import django.core.exceptions
from netfields import rest_framework as netfields_rf
from rest_framework import serializers

from desecapi.models import Token, TokenDomainPolicy


class TokenSerializer(serializers.ModelSerializer):
    allowed_subnets = serializers.ListField(child=netfields_rf.CidrAddressField(), required=False)
    token = serializers.ReadOnlyField(source='plain')
    is_valid = serializers.ReadOnlyField()

    class Meta:
        model = Token
        fields = ('id', 'created', 'last_used', 'max_age', 'max_unused_period', 'name', 'perm_manage_tokens',
                  'allowed_subnets', 'is_valid', 'token',)
        read_only_fields = ('id', 'created', 'last_used', 'token')

    def __init__(self, *args, include_plain=False, **kwargs):
        self.include_plain = include_plain
        return super().__init__(*args, **kwargs)

    def get_fields(self):
        fields = super().get_fields()
        if not self.include_plain:
            fields.pop('token')
        return fields


class DomainSlugRelatedField(serializers.SlugRelatedField):

    def get_queryset(self):
        return self.context['request'].user.domains


class TokenDomainPolicySerializer(serializers.ModelSerializer):
    domain = DomainSlugRelatedField(allow_null=True, slug_field='name')

    class Meta:
        model = TokenDomainPolicy
        fields = ('domain', 'perm_dyndns', 'perm_rrsets',)

    def to_internal_value(self, data):
        return {**super().to_internal_value(data),
                'token': self.context['request'].user.token_set.get(id=self.context['view'].kwargs['token_id'])}

    def save(self, **kwargs):
        try:
            return super().save(**kwargs)
        except django.core.exceptions.ValidationError as exc:
            raise serializers.ValidationError(exc.message_dict, code='precedence')