# Webhooks for external integrations.
from __future__ import absolute_import
from django.utils.translation import ugettext as _
from zerver.lib.actions import check_send_message
from zerver.lib.response import json_success, json_error
from zerver.decorator import REQ, has_request_variables, api_key_only_webhook_view
from zerver.lib.validator import check_dict, check_string
from zerver.models import UserProfile

from django.http import HttpRequest, HttpResponse
from typing import Dict, Any, Iterable, Optional, Text

@api_key_only_webhook_view('Mention')
@has_request_variables
def api_mention_webhook(request, user_profile,
                        payload=REQ(argument_type='body'),
                        stream=REQ(default='mention'),
                        topic=REQ(default='news')):
    # type: (HttpRequest, UserProfile, Dict[str, Iterable[Dict[str, Any]]], Text, Optional[Text]) -> HttpResponse

    try:
        title = payload["title"]
        source_url = payload["url"]
        description = payload["description"]
    except KeyError as e:
        return json_error(_("Missing key {} in JSON").format(str(e)))

    # construct the body of the message
    body = '**[%s](%s)**:\n%s' % (title, source_url, description)

    # send the message
    check_send_message(user_profile, request.client, 'stream', [stream], topic, body)

    return json_success()