import argparse
import logging
import signal

from .camera import make_camera
from .gstreamer import Display, run_gen
from .streaming.server import StreamingServer

from . import svg

EMPTY_SVG = str(svg.Svg())

def run_server(add_render_gen_args, render_gen):
    logging.basicConfig(level=logging.INFO)

    parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('--source',
                        help='/dev/videoN:FMT:WxH:N/D or .mp4 file or image file',
                        default='/dev/video0:YUY2:640x480:30/1')
    parser.add_argument('--bitrate', type=int, default=1000000,
                        help='Video streaming bitrate (bit/s)')

    add_render_gen_args(parser)
    args = parser.parse_args()

    gen = render_gen(args)
    camera = make_camera(args.source, next(gen))
    assert camera is not None

    with StreamingServer(camera, args.bitrate) as server:
        def render_overlay(tensor, layout, command):
            overlay = gen.send((tensor, layout, command))
            server.send_overlay(overlay if overlay else EMPTY_SVG)

        camera.render_overlay = render_overlay
        signal.pause()


def run_app(add_render_gen_args, render_gen):
    parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('--source',
                        help='/dev/videoN:FMT:WxH:N/D or .mp4 file or image file',
                        default='/dev/video0:YUY2:1280x720:30/1')
    parser.add_argument('--downscale', type=float, default=2.0,
                        help='Downscale factor for .mp4 file rendering')
    parser.add_argument('--displaymode', type=Display, choices=Display, default=Display.FULLSCREEN,
                        help='Display mode')
    add_render_gen_args(parser)
    args = parser.parse_args()

    if not run_gen(render_gen(args),
                   source=args.source,
                   downscale=args.downscale,
                   display=args.displaymode):
        print('Invalid source argument:', args.source)