#!/usr/bin/env python3
import os
from datetime import date, datetime
from functools import wraps
from typing import List

from dateutil.parser import parse
from motor.motor_asyncio import AsyncIOMotorClient
from pymongo.errors import PyMongoError
from sanic import Sanic
from sanic.response import json, text
from sanic_prometheus import monitor

import kube
import slack

app = Sanic(__name__)
slack.add_routes(app)
monitor(app).expose_endpoint()

# API key for godoor controllers authenticating to k-space:floor
DOORBOY_SECRET_FLOOR = os.environ["DOORBOY_SECRET_FLOOR"]
# API key for godoor controllers authenticating to k-space:workshop
DOORBOY_SECRET_WORKSHOP = os.environ["DOORBOY_SECRET_WORKSHOP"]
FLOOR_ACCESS_GROUP = os.getenv("FLOOR_ACCESS_GROUP", "k-space:floor")
WORKSHOP_ACCESS_GROUP = os.getenv("WORKSHOP_ACCESS_GROUP", "k-space:workshop")

MONGO_URI = os.environ["MONGO_URI"]

assert len(DOORBOY_SECRET_FLOOR) >= 10
assert len(DOORBOY_SECRET_WORKSHOP) >= 10


@app.listener("before_server_start")
async def setup_db(app, loop):
    # TODO: find cleaner way to do this, for more see
    # https://github.com/sanic-org/sanic/issues/919
    app.ctx.db = AsyncIOMotorClient(MONGO_URI).get_default_database()


def authenticate_door(wrapped):
    def decorator(f):
        @wraps(f)
        async def decorated_function(request, *args, **kwargs):
            doorboy_secret = request.headers.get("KEY")
            if doorboy_secret not in [DOORBOY_SECRET_FLOOR, DOORBOY_SECRET_WORKSHOP]:
                return text("Invalid doorboy secret token", status=401)

            return await f(request, *args, **kwargs)

        return decorated_function

    return decorator(wrapped)


@app.route("/allowed")
@authenticate_door
async def view_doorboy_uids(request):
    users = List[str]

    # authorize
    key = request.headers.get("KEY")
    if key == DOORBOY_SECRET_FLOOR:
        users = kube.users_with_group(FLOOR_ACCESS_GROUP)
    elif key == DOORBOY_SECRET_WORKSHOP:
        users = kube.users_with_group(WORKSHOP_ACCESS_GROUP)
    else:
        print("WARN: unknown door token in /allowed")
        return "unknown doorboy secret token", 403

    flt = {
        "token.uid_hash": {"$exists": True},
        "inventory.owner.username": {"$in": users},
    }
    prj = {"token.uid_hash": True}
    tokens = await app.ctx.db.inventory.find(flt, prj)

    print(f"delegating {len(tokens)} doorkey tokens")
    return json({"allowed_uids": tokens})


def datetime_to_json_formatting(o):
    if isinstance(o, (date, datetime)):
        return o.isoformat()


# Only identified and successful events. **Endpoint not in use.**
@app.route("/logs")
async def view_open_door_events(request):
    return text("not an admin"), 403

    results = (
        await app.ctx.db.eventlog.find(
            {
                "component": "doorboy",
                "type": "open-door",
                "approved": True,
                "$or": [
                    {"type": "open-door"},
                    {"event": "card-swiped"},
                ],
                "door": {"$exists": True},
                "timestamp": {"$exists": True},
            }
        )
        .sort("timestamp", -1)
        .to_list(length=None)
    )

    transformed = []
    for r in results:
        if r.get("type") == "open-door" and r.get("approved") and r.get("method"):
            transformed.append(
                {
                    "method": r.get("method"),
                    "door": r["door"],
                    "timestamp": r.get("timestamp"),
                    "member": r.get("member"),
                }
            )
        if r.get("event") == "card-swiped" and r.get("success"):
            transformed.append(
                {
                    "method": "card-swiped",
                    "door": r["door"],
                    "timestamp": r.get("timestamp"),
                    "member": r.get("inventory", {}).get("owner"),
                }
            )

    return json(transformed, default=datetime_to_json_formatting)


@app.route("/longpoll", stream=True)
@authenticate_door
async def view_longpoll(request):
    response = await request.respond(content_type="text/event-stream")
    await response.send("data: response-generator-started\n\n")
    pipeline = [
        {
            "$match": {
                "operationType": "insert",
            }
        }
    ]
    try:
        async with app.ctx.db.eventlog.watch(pipeline) as stream:
            await response.send("data: watch-stream-opened\n\n")
            async for event in stream:
                ev = event["fullDocument"]
                if ev["approved"] != "true":
                    continue
                if ev["type"] == "card":
                    continue

                response.send("data: %s\n\n" % ev["door"])
    except PyMongoError as e:
        print(e)
        await response.send("data: response-generator-ended\n\n")
        return


# Called by the door to log a card swipe. Does not decide whether the door should be opened.
@app.post("/swipe")
@authenticate_door
async def swipe(request):
    # authorize
    key = request.headers.get("KEY")
    data = request.json
    doors = set()
    if key == DOORBOY_SECRET_FLOOR:
        doors.update(["backdoor", "frontdoor", "grounddoor"])
    if key == DOORBOY_SECRET_WORKSHOP:
        doors.add("workshopdoor")
    if data.get("door") not in doors:
        print("WARN: Door", repr(data.get("door")), "not in", doors)
        return text("Not allowed", 403)

    timestamp = (
        parse(data["timestamp"])
        if data.get("timestamp")
        else datetime.now(datetime.timezone.utc)
    )

    # Update token, create if unknown
    await app.ctx.db.inventory.update_one(
        {"component": "doorboy", "type": "token", "token.uid_hash": data["uid_hash"]},
        {
            "$set": {"last_seen": timestamp},
            "$setOnInsert": {
                "first_seen": timestamp,
                "inventory": {
                    "claimable": True,
                },
            },
        },
        upsert=True,
    )

    token = await app.ctx.db.inventory.find_one(
        {"component": "doorboy", "type": "token", "token.uid_hash": data["uid_hash"]}
    )

    event_swipe = {
        "component": "doorboy",
        "method": "card",
        "timestamp": timestamp,
        "door": data["door"],
        "approved": data["approved"],
        "user": {
            "id": token.get("inventory", {}).get("owner", {}).get("username", ""),
            "name": token.get("inventory", {})
            .get("owner", {})
            .get("display_name", "Unclaimed Token"),
        },
        "uid_hash": data["uid_hash"],
    }
    await app.ctx.db.eventlog.insert_one(event_swipe)

    return text("ok")


if __name__ == "__main__":
    app.run(
        debug=False, host="0.0.0.0", port=5000, single_process=True, access_log=True
    )