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

from django.http import HttpRequest, HttpResponse
from django.utils.translation import ugettext as _

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

OPEN_TEMPLATE = """
[Incident]({incident_url}) **opened** for condition: **{condition_name}** at <time:{iso_timestamp}>
``` quote
{details}
```
""".strip()

DEFAULT_TEMPLATE = (
    """[Incident]({incident_url}) **{status}** {owner}for condition: **{condition_name}**""".strip()
)

TOPIC_TEMPLATE = """{policy_name} ({incident_id})""".strip()


@webhook_view("NewRelic")
@has_request_variables
def api_newrelic_webhook(
    request: HttpRequest,
    user_profile: UserProfile,
    payload: Dict[str, Any] = REQ(argument_type="body"),
) -> HttpResponse:

    info = {
        "condition_name": payload.get("condition_name", "Unknown condition"),
        "details": payload.get("details", "No details."),
        "incident_url": payload.get("incident_url", "https://alerts.newrelic.com"),
        "incident_acknowledge_url": payload.get(
            "incident_acknowledge_url", "https://alerts.newrelic.com"
        ),
        "status": payload.get("current_state", "None"),
        "iso_timestamp": "",
        "owner": payload.get("owner", ""),
    }

    unix_time = payload.get("timestamp", None)
    if unix_time is None:
        return json_error(_("The newrelic webhook requires timestamp in milliseconds"))

    info["iso_timestamp"] = unix_milliseconds_to_timestamp(unix_time, "newrelic")

    # Add formatting to the owner field if owner is present
    if info["owner"] != "":
        info["owner"] = "by **{}** ".format(info["owner"])

    # These are the three promised current_state values
    if "open" in info["status"]:
        content = OPEN_TEMPLATE.format(**info)
    elif "acknowledged" in info["status"]:
        content = DEFAULT_TEMPLATE.format(**info)
    elif "closed" in info["status"]:
        content = DEFAULT_TEMPLATE.format(**info)
    else:
        return json_error(
            _("The newrelic webhook requires current_state be in [open|acknowledged|closed]")
        )

    topic_info = {
        "policy_name": payload.get("policy_name", "Unknown Policy"),
        "incident_id": payload.get("incident_id", "Unknown ID"),
    }
    topic = TOPIC_TEMPLATE.format(**topic_info)

    check_send_webhook_message(request, user_profile, topic, content)
    return json_success()