# Webhooks for external integrations.
from typing import Dict, Any, List

from django.http import HttpRequest, HttpResponse

from zerver.decorator import api_key_only_webhook_view
from zerver.lib.request import REQ, has_request_variables
from zerver.lib.response import json_success
from zerver.lib.webhooks.common import check_send_webhook_message
from zerver.models import UserProfile

subject_types = {
    'app': [  # Object type name
        ['name'],  # Title
        ['html_url'],  # Automatically put into title
        ['language'],  # Other properties.
        ['framework']
    ],
    'base': [
        ['title'],
        ['html_url'],
        ['#summary'],
        ['subject']
    ],
    'comment': [
        [''],
        ['subject']
    ],
    'errorgroup': [
        ['E#{}', 'number'],
        ['html_url'],
        ['last_occurrence:error']
    ],
    'error': [
        [''],
        ['">**Most recent Occurrence**'],
        ['in {}', 'extra/pathname'],
        ['!message']
    ]
}  # type: Dict[str, List[List[str]]]


def get_value(_obj: Dict[str, Any], key: str) -> str:
    for _key in key.lstrip('!').split('/'):
        if _key in _obj.keys():
            _obj = _obj[_key]
        else:
            return ''
    return str(_obj)


def format_object(
    obj: Dict[str, Any],
    subject_type: str,
    message: str
) -> str:
    if subject_type not in subject_types.keys():
        return message
    keys = subject_types[subject_type][1:]  # type: List[List[str]]
    title = subject_types[subject_type][0]
    if title[0] != '':
        title_str = ''
        if len(title) > 1:
            title_str = title[0].format(get_value(obj, title[1]))
        else:
            title_str = obj[title[0]]
        if obj['html_url'] is not None:
            url = obj['html_url']  # type: str
            if 'opbeat.com' not in url:
                url = 'https://opbeat.com/' + url.lstrip('/')
            message += '\n**[{}]({})**'.format(title_str, url)
        else:
            message += '\n**{}**'.format(title_str)
    for key_list in keys:
        if len(key_list) > 1:
            value = key_list[0].format(get_value(obj, key_list[1]))
            message += '\n>{}'.format(value)
        else:
            key = key_list[0]
            key_raw = key.lstrip('!').lstrip('#').lstrip('"')
            if key_raw != 'html_url' and key_raw != 'subject' and ':' not in key_raw:
                value = get_value(obj, key_raw)
                if key.startswith('!'):
                    message += '\n>{}'.format(value)
                elif key.startswith('#'):
                    message += '\n{}'.format(value)
                elif key.startswith('"'):
                    message += '\n{}'.format(key_raw)
                else:
                    message += '\n>{}: {}'.format(key, value)
            if key == 'subject':
                message = format_object(
                    obj['subject'], obj['subject_type'], message + '\n')
            if ':' in key:
                value, value_type = key.split(':')
                message = format_object(obj[value], value_type, message + '\n')
    return message


@api_key_only_webhook_view("Opbeat")
@has_request_variables
def api_opbeat_webhook(request: HttpRequest, user_profile: UserProfile,
                       payload: Dict[str, Any]=REQ(argument_type='body')) -> HttpResponse:
    """
    This uses the subject name from opbeat to make the subject,
    and the summary from Opbeat as the message body, with
    details about the object mentioned.
    """

    message_subject = payload['title']

    message = format_object(payload, 'base', '')

    check_send_webhook_message(request, user_profile, message_subject, message)
    return json_success()