from pymongo.errors import PyMongoError
from requests.exceptions import RequestException
import os
import requests

SLACK_DOORLOG_CALLBACK = os.environ["SLACK_DOORLOG_CALLBACK"] # webhook logs to private channel or "DEV" to print to console.

def add_slack_routes(app):
    app.app.register_listener(slack_log, "after_server_start") # consumes SLACK_DOORLOG_CALLBACK and app.ctx.db

def slack_post(msg):
    if SLACK_DOORLOG_CALLBACK == "DEV":
        print(f"[DEV SLACK]: {msg}")
        return

    try:
        requests.post(SLACK_DOORLOG_CALLBACK, json={"text": msg }).raise_for_status()
    except RequestException as e:
        print(f"[SLACK]: {e}")

def approvedStr(approved: bool) -> str:
    if approved:
        return "Permitted"
    
    return "Denied"

async def slack_log(app, loop):
    pipeline = [{
        "$match": {
            "operationType": "insert",
        }
    }]
    while True:
        try:
            async with app.ctx.db.eventlog.watch(pipeline) as stream:
                async for event in stream:
                    ev = event["fullDocument"]
                    
                    msg = "%s %s access for %s via %s" % (approvedStr(ev["approved"]), ev["door"], ev["user"]["name"], ev("method"))
                    slack_post(msg)
        
        except PyMongoError as e:
            print(e)