# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

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)')
    parser.add_argument('--loop', default=False, action='store_true',
                        help='Loop input video file')

    add_render_gen_args(parser)
    args = parser.parse_args()

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

    with StreamingServer(camera, args.bitrate) as server:
        def render_overlay(image, layout, command):
            overlay = gen.send((image, 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('--loop',  default=False, action='store_true',
                        help='Loop input video file')
    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,
                   loop=args.loop,
                   display=args.displaymode):
        print('Invalid source argument:', args.source)