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

from accounts.const import SecretStrategy, SecretType
from accounts.models import AccountTemplate
from accounts.utils import SecretGenerator
from common.serializers import SecretReadableMixin
from common.serializers.fields import ObjectRelatedField
from .base import BaseAccountSerializer


class PasswordRulesSerializer(serializers.Serializer):
    length = serializers.IntegerField(min_value=8, max_value=30, default=16, label=_('Password length'))
    lowercase = serializers.BooleanField(default=True, label=_('Lowercase'))
    uppercase = serializers.BooleanField(default=True, label=_('Uppercase'))
    digit = serializers.BooleanField(default=True, label=_('Digit'))
    symbol = serializers.BooleanField(default=True, label=_('Special symbol'))
    exclude_symbols = serializers.CharField(
        default='', allow_blank=True, max_length=16, label=_('Exclude symbol')
    )


class AccountTemplateSerializer(BaseAccountSerializer):
    password_rules = PasswordRulesSerializer(required=False, label=_('Password rules'))
    su_from = ObjectRelatedField(
        required=False, queryset=AccountTemplate.objects, allow_null=True,
        allow_empty=True, label=_('Su from'), attrs=('id', 'name', 'username')
    )

    class Meta(BaseAccountSerializer.Meta):
        model = AccountTemplate
        fields = BaseAccountSerializer.Meta.fields + [
            'secret_strategy', 'password_rules',
            'auto_push', 'push_params', 'platforms',
            'su_from'
        ]
        extra_kwargs = {
            'secret_strategy': {'help_text': _('Secret generation strategy for account creation')},
            'auto_push': {'help_text': _('Whether to automatically push the account to the asset')},
            'platforms': {
                'help_text': _(
                    'Associated platform, you can configure push parameters. '
                    'If not associated, default parameters will be used'
                ),
                'required': False
            },
        }

    @staticmethod
    def generate_secret(attrs):
        secret_type = attrs.get('secret_type', SecretType.PASSWORD)
        secret_strategy = attrs.get('secret_strategy', SecretStrategy.custom)
        password_rules = attrs.get('password_rules')
        if secret_strategy != SecretStrategy.random:
            return
        generator = SecretGenerator(secret_strategy, secret_type, password_rules)
        attrs['secret'] = generator.get_secret()

    def validate(self, attrs):
        attrs = super().validate(attrs)
        self.generate_secret(attrs)
        return attrs


class AccountTemplateSecretSerializer(SecretReadableMixin, AccountTemplateSerializer):
    class Meta(AccountTemplateSerializer.Meta):
        extra_kwargs = {
            'secret': {'write_only': False},
        }