from django import forms
from django.utils.translation import gettext_lazy as _

from pingcap_sso.discourse.lib import is_topic_exists


class TopicForm(forms.Form):

    topic_id = forms.IntegerField(required=True)

    def clean_topic_id(self):
        topic_id = self.cleaned_data.get('topic_id')
        if topic_id:
            if not is_topic_exists(topic_id):
                raise forms.ValidationError(_('topic does not exist'))
        return topic_id