import os
from datetime import datetime, timezone
from typing import Tuple

import kube
import requests
from pymongo.errors import PyMongoError
from requests.exceptions import RequestException
from sanic import Blueprint
from sanic.response import text

slack_app = Blueprint("slack", __name__)

# webhook logs to private channel or "DEV" to print to console.
SLACK_DOORLOG_CALLBACK = os.environ["SLACK_DOORLOG_CALLBACK"]
# used to verify (deprecated) incoming requests from slack
SLACK_VERIFICATION_TOKEN = os.environ["SLACK_VERIFICATION_TOKEN"]
SLACK_CHANNEL_ID = os.environ["SLACK_CHANNEL_ID"]  # TODO:

def fauthGroup(door: str) -> str:
    match door:
        case "alldoors" | "backdoor" | "frontdoor" | "grounddoor":
            return "k-space:floor"
        case "workshopdoor":
            return "k-space:workshop"
        case _:
            return None

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"


# consumes SLACK_DOORLOG_CALLBACK and app.ctx.db
@slack_app.listener("after_server_start")
async def slack_log_fwd(app):
    pipeline = [
        {
            "$match": {
                "operationType": "insert",
            }
        }
    ]
    while True:
        try:
            async with app.ctx.db.doorlog.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"],
                        ev["method"],
                    )
                    slack_post(msg)

        except PyMongoError as e:
            print(e)

# -> approved, user, err
def slack_authz(authGroup: str, slackId: str, slackName: str, channel_id: str) -> Tuple[bool, str, str]:
    groups, user = kube.by_slackid(slackId)
    if user is None:
        user = f"{slackId} (slack u/n: {slackName})" # slackName can be changed by user

        if authGroup == "k-space:floor":
            if channel_id == SLACK_CHANNEL_ID:
                print(f"WARN: slack #members open with unlinked ID: {user}")
                return True, user, f"This will stop working! Your Slack ID {slackId} is not linked with auth.k-space.ee, please notify info@k-space.ee."

            return False, user, f"No user with slack_id {slackId}. Try in #members or doorboy.k-space.ee. Help at info@k-space.ee.",
        else:
            return False, user, f"No user with slack_id {slackId}. Try doorboy.k-space.ee. Help at info@k-space.ee."

    if authGroup not in groups:
        return False, user, f"You are not in {authGroup}. k-space.ee/membership"

    return True, user, ""

@slack_app.route("/slack-open", methods=["POST"])
async def slack_open(request):
    if request.form.get("token") != SLACK_VERIFICATION_TOKEN:
        print("WARN: /slack-open route accessed with invalid token")
        return "Invalid token (are you Slack?)", 401

    command = request.form.get("command")
    door = command.removeprefix("/open-").replace("-", "")

    authGroup = fauthGroup(door)
    if authGroup is None:
        print(f"WARN: unknown slack door {door}")
        return "Invalid door! (git.k-space.ee/k-space/doorboy-proxy)"

    ok, user, err = slack_authz(
        authGroup,
        request.form.get("user_id"),
        request.form.get("user_name"),
        request.form.get("channel_id"),
    )

    doors = [door]
    if door == "alldoors":
        # outside non-special doors
        doors = ["backdoor", "frontdoor", "grounddoor"]

    for d in doors:
        await request.app.ctx.db.doorlog.insert_one(
            {
                "method": "slack",
                "timestamp": datetime.now(timezone.utc),
                "door": d,
                "approved": ok,
                "user": user,
            }
        )

    if not ok:
        return text(err)

    if err:
        return text(f"Opening {door}… {err}")

    return text(f"Opening {door}…")