#!bin/python
"""
Collector receives device attrs from multiple senders, combines
them, and sends output attrs to hardware. The combining part has
custom code for some attributes.

Input can be over http or zmq.
"""
import asyncio
import functools
import logging
import os
import stat
import subprocess
import traceback
from typing import List

from light9 import networking
from light9.collector.collector import Collector
from light9.collector.output import ArtnetDmx, DummyOutput, Output, Udmx  # noqa
from light9.collector.weblisteners import UiListener, WebListeners
from light9.namespaces import L9
from light9.run_local import log
from light9.zmqtransport import parseJsonMessage
from rdfdb.syncedgraph.syncedgraph import SyncedGraph
from starlette.applications import Starlette
from starlette.endpoints import WebSocketEndpoint
from starlette.requests import ClientDisconnect
from starlette.responses import Response
from starlette.routing import Route, WebSocketRoute
from starlette.types import Receive, Scope, Send
from starlette.websockets import WebSocket
from starlette_exporter import PrometheusMiddleware, handle_metrics

import zmq
import zmq.asyncio

# this is the rate sent to usb
RATE = 1/0.055


class Updates(WebSocketEndpoint, UiListener):

    def __init__(self, listeners, scope: Scope, receive: Receive, send: Send) -> None:
        super().__init__(scope, receive, send)
        self.listeners = listeners

    async def on_connect(self, websocket: WebSocket):
        await websocket.accept()
        log.info('socket connect %s', self.scope['client'])
        self.websocket = websocket
        self.listeners.addClient(self)

    async def sendMessage(self, msgText: bytes):
        await self.websocket.send_bytes(msgText)

    # async def on_receive(self, websocket, data):
    #     json.loads(data)

    async def on_disconnect(self, websocket: WebSocket, close_code: int):
        self.listeners.delClient(self)


async def PutAttrs(collector: Collector, request):
    try:
        body = await request.body()
    except ClientDisconnect:
        log.warning("PUT /attrs request disconnected- ignoring")
        return Response('', status_code=400)
    client, clientSession, settings, sendTime = parseJsonMessage(collector.graph, body)
    collector.setAttrs(client, clientSession, settings, sendTime)
    return Response('', status_code=202)


async def zmqListener(collector):
    try:
        ctx = zmq.asyncio.Context()
        sock = ctx.socket(zmq.SUB)
        sock.bind('tcp://127.0.0.1:9203')
        sock.subscribe(b'setAttr')
        while True:
            [topic, msg] = await sock.recv_multipart()
            if topic != b'setAttr':
                raise ValueError(topic)
            # log.info(f'zmq recv {len(msg)}')
            client, clientSession, settings, sendTime = parseJsonMessage(collector.graph, msg)
            collector.setAttrs(client, clientSession, settings, sendTime)
    except:
        traceback.print_exc()
        raise


def findDevice():
    for line in subprocess.check_output("lsusb").decode('utf8').splitlines():
        if '16c0:05dc' in line:
            words = line.split(':')[0].split()
            dev = f'/dev/bus/usb/{words[1]}/{words[3]}'
            log.info(f'device will be {dev}')
            st = os.stat(dev)
            if not (st.st_mode & (stat.S_IWUSR | stat.S_IRUSR)):
                raise ValueError(f'{dev} has insufficient stat ({stat.filemode(st.st_mode)})')
            return dev, int(words[1]), int(words[3])
    raise ValueError("no matching uDMX found")


def main():
    logging.getLogger('autodepgraphapi').setLevel(logging.INFO)
    logging.getLogger('syncedgraph').setLevel(logging.INFO)
    logging.getLogger('output.allDmx').setLevel(logging.WARNING)
    logging.getLogger().setLevel(logging.DEBUG)
    logging.getLogger('collector').setLevel(logging.DEBUG)

    graph = SyncedGraph(networking.rdfdb.url, "collector")

    devPath, bus, usbAddress = findDevice()
    # if user doesn't have r/w, fail now
    try:
        # todo: drive outputs with config files
        outputs: List[Output] = [
            # ArtnetDmx(L9['output/dmxA/'],
            #           host='127.0.0.1',
            #           port=6445,
            #           rate=rate),
            #sudo chmod a+rw /dev/bus/usb/003/021
            Udmx(L9['output/dmxA/'], bus=bus, address=usbAddress, lastDmxChannel=200, rate=RATE),
        ]
    except Exception:
        log.error("setting up outputs:")
        traceback.print_exc()
        raise
    listeners = WebListeners()
    c = Collector(graph, outputs, listeners)
    zl = asyncio.create_task(zmqListener(c))
    app = Starlette(
        debug=True,
        routes=[
            # Route('/recentRequests', lambda req: get_recentRequests(req, db)),
            WebSocketRoute('/updates', endpoint=functools.partial(Updates, listeners)),
            Route('/attrs', functools.partial(PutAttrs, c), methods=['PUT']),
        ],
    )
    app.add_middleware(PrometheusMiddleware)
    app.add_route("/metrics", handle_metrics)

    # loadtest = os.environ.get('LOADTEST', False)  # call myself with some synthetic load then exit
    # if loadtest:
    #     # in a subprocess since we don't want this client to be
    #     # cooperating with the main event loop and only sending
    #     # requests when there's free time
    #     def afterWarmup():
    #         log.info('running collector_loadtest')
    #         d = utils.getProcessValue('bin/python', ['bin/collector_loadtest.py'])

    #         def done(*a):
    #             log.info('loadtest done')
    #             reactor.stop()

    #         d.addCallback(done)

    #     reactor.callLater(2, afterWarmup)

    return app


# import yappi; yappi.start()
app = main()
# app.add_route('/profile', lambda req: yappi.get_func_stats().print_all(columns={0: ("name", 80), 1: ("ncall", 5), 2: ("tsub", 8), 3: ("ttot", 8), 4: ("tavg", 8)}))