#!/usr/bin/env python3
from sanic import Sanic
from sanic.response import text, json
from sanic_prometheus import monitor
from motor.motor_asyncio import AsyncIOMotorClient
import httpx
import pymongo
import os

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

INVENTORY_API_KEY = os.environ["INVENTORY_API_KEY"]
DOORBOY_SECRET_FLOOR = os.environ["DOORBOY_SECRET_FLOOR"]
DOORBOY_SECRET_WORKSHOP = os.environ["DOORBOY_SECRET_WORKSHOP"]
CARD_URI = os.environ["CARD_URI"]
FLOOR_ACCESS_GROUP = os.environ["FLOOR_ACCESS_GROUP"]
WORKSHOP_ACCESS_GROUP = os.environ["WORKSHOP_ACCESS_GROUP"]
MONGO_URI = os.environ["MONGO_URI"]
SWIPE_URI = os.environ["SWIPE_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()

@app.route("/allowed")
async def view_doorboy_uids(request):
    key = request.headers.get("KEY")
    if not key or key not in [DOORBOY_SECRET_FLOOR, DOORBOY_SECRET_WORKSHOP]:
        return text("how about no")

    groups = []
    if key == DOORBOY_SECRET_FLOOR:
        groups.append(FLOOR_ACCESS_GROUP)
    if key == DOORBOY_SECRET_WORKSHOP:
        groups.append(WORKSHOP_ACCESS_GROUP)
    if not groups:
        return "fail", 500
    async with httpx.AsyncClient() as client:
        r = await client.post(CARD_URI, json={
            "groups": groups
        }, headers={
            "Content-Type": "application/json",
            "Authorization": f"Basic {INVENTORY_API_KEY}"
        })
    j = r.json()
    allowed_uids = []
    for obj in j:
        allowed_uids.append({
            "token": obj["token"]
        })
    return json({"allowed_uids": allowed_uids})


@app.route("/longpoll", stream=True)
async def view_longpoll(request):
    key = request.headers.get("KEY")
    if not key or key not in [DOORBOY_SECRET_FLOOR, DOORBOY_SECRET_WORKSHOP]:
        return text("Invalid token")

    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:
                if event["fullDocument"].get("type") == "open-door" and event["fullDocument"].get("approved", False):
                    await response.send("data: %s\n\n" %
                                        event["fullDocument"]["door"])
    except pymongo.errors.PyMongoError as e:
        print(e)
        await response.send("data: response-generator-ended\n\n")
        return

@app.post("/swipe")
async def forward_swipe(request):
    key = request.headers.get("KEY")
    if not key or key not in [DOORBOY_SECRET_FLOOR, DOORBOY_SECRET_WORKSHOP]:
        return text("Invalid token", status=401)
    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("Door", repr(data.get("door")), "not in", doors)
        return text("Not allowed", 403)

    async with httpx.AsyncClient() as client:
        r = await client.post(SWIPE_URI, json=data, headers={
            "Content-Type": "application/json",
            "Authorization": f"Basic {INVENTORY_API_KEY}"
        })
    if r.status_code == 200:
        return text("ok")
    else:
        return text("Failed", 500)


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