import argparse
import asyncio
import json
import logging
import os
import ssl

from aiohttp import web
from aiortc import RTCPeerConnection, RTCSessionDescription
from aiortc.contrib.media import MediaPlayer

ROOT = os.path.dirname(__file__)


def create_local_tracks(face, mask):
    player = MediaPlayer(face)
    player2 = MediaPlayer(mask)
    return player.audio, player.video, player2.video


async def index(request):
    content = open(os.path.join(ROOT, "index.html"), "r").read()
    return web.Response(content_type="text/html", text=content)


async def javascript(request):
    content = open(os.path.join(ROOT, "client.js"), "r").read()
    return web.Response(content_type="application/javascript", text=content)


async def offer(request):
    params = await request.json()
    offer = RTCSessionDescription(sdp=params["sdp"], type=params["type"])

    pc = RTCPeerConnection()
    pcs.add(pc)

    @pc.on("connectionstatechange")
    async def on_connectionstatechange():
        print("Connection state is %s" % pc.connectionState)
        if pc.connectionState == "failed":
            await pc.close()
            pcs.discard(pc)

    # open media source
    audio, face, mask = create_local_tracks(args.play_face, args.play_mask)
    face._id = "face"
    mask._id = "mask"

    await pc.setRemoteDescription(offer)
    for t in pc.getTransceivers():
        if t.kind == "audio" and audio:
            pc.addTrack(audio)
        elif t.kind == "video" and face:
            try:
                pc.addTrack(face)
            except:
                pc.addTrack(mask)

    answer = await pc.createAnswer()
    await pc.setLocalDescription(answer)

    return web.Response(
        content_type="application/json",
        text=json.dumps(
            {"sdp": pc.localDescription.sdp, "type": pc.localDescription.type}
        ),
    )


pcs = set()


async def on_shutdown(app):
    # close peer connections
    coros = [pc.close() for pc in pcs]
    await asyncio.gather(*coros)
    pcs.clear()


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="WebRTC webcam demo")
    parser.add_argument("--cert-file", help="SSL certificate file (for HTTPS)")
    parser.add_argument("--key-file", help="SSL key file (for HTTPS)")
    parser.add_argument("--play-face", help="Read the media from a file and sent it."),
    parser.add_argument("--play-mask", help="Read the media from a file and sent it."),
    parser.add_argument(
        "--host", default="0.0.0.0", help="Host for HTTP server (default: 0.0.0.0)"
    )
    parser.add_argument(
        "--port", type=int, default=8080, help="Port for HTTP server (default: 8080)"
    )
    parser.add_argument("--verbose", "-v", action="count")
    args = parser.parse_args()

    if args.verbose:
        logging.basicConfig(level=logging.DEBUG)
    else:
        logging.basicConfig(level=logging.INFO)

    if args.cert_file:
        ssl_context = ssl.SSLContext()
        ssl_context.load_cert_chain(args.cert_file, args.key_file)
    else:
        ssl_context = None

    app = web.Application()
    app.on_shutdown.append(on_shutdown)
    app.router.add_static("/", "dist")
    app.router.add_post("/offer", offer)
    web.run_app(app, host=args.host, port=args.port, ssl_context=ssl_context)