"""Support for Canary camera."""
import asyncio
from datetime import timedelta
import logging

from haffmpeg.camera import CameraMjpeg
from haffmpeg.tools import IMAGE_JPEG, ImageFrame
import voluptuous as vol

from homeassistant.components.camera import PLATFORM_SCHEMA, Camera
from homeassistant.components.ffmpeg import DATA_FFMPEG
from homeassistant.helpers import config_validation as cv
from homeassistant.helpers.aiohttp_client import async_aiohttp_proxy_stream
from homeassistant.util import Throttle

from . import DATA_CANARY, DEFAULT_TIMEOUT

_LOGGER = logging.getLogger(__name__)

CONF_FFMPEG_ARGUMENTS = "ffmpeg_arguments"
DEFAULT_ARGUMENTS = "-pred 1"

MIN_TIME_BETWEEN_SESSION_RENEW = timedelta(seconds=90)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {vol.Optional(CONF_FFMPEG_ARGUMENTS, default=DEFAULT_ARGUMENTS): cv.string}
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the Canary sensors."""
    if discovery_info is not None:
        return

    data = hass.data[DATA_CANARY]
    devices = []

    for location in data.locations:
        for device in location.devices:
            if device.is_online:
                devices.append(
                    CanaryCamera(
                        hass,
                        data,
                        location,
                        device,
                        DEFAULT_TIMEOUT,
                        config[CONF_FFMPEG_ARGUMENTS],
                    )
                )

    add_entities(devices, True)


class CanaryCamera(Camera):
    """An implementation of a Canary security camera."""

    def __init__(self, hass, data, location, device, timeout, ffmpeg_args):
        """Initialize a Canary security camera."""
        super().__init__()

        self._ffmpeg = hass.data[DATA_FFMPEG]
        self._ffmpeg_arguments = ffmpeg_args
        self._data = data
        self._location = location
        self._device = device
        self._timeout = timeout
        self._live_stream_session = None

    @property
    def name(self):
        """Return the name of this device."""
        return self._device.name

    @property
    def is_recording(self):
        """Return true if the device is recording."""
        return self._location.is_recording

    @property
    def motion_detection_enabled(self):
        """Return the camera motion detection status."""
        return not self._location.is_recording

    async def async_camera_image(self):
        """Return a still image response from the camera."""
        await self.hass.async_add_executor_job(self.renew_live_stream_session)

        ffmpeg = ImageFrame(self._ffmpeg.binary, loop=self.hass.loop)
        image = await asyncio.shield(
            ffmpeg.get_image(
                self._live_stream_session.live_stream_url,
                output_format=IMAGE_JPEG,
                extra_cmd=self._ffmpeg_arguments,
            )
        )
        return image

    async def handle_async_mjpeg_stream(self, request):
        """Generate an HTTP MJPEG stream from the camera."""
        if self._live_stream_session is None:
            return

        stream = CameraMjpeg(self._ffmpeg.binary, loop=self.hass.loop)
        await stream.open_camera(
            self._live_stream_session.live_stream_url, extra_cmd=self._ffmpeg_arguments
        )

        try:
            stream_reader = await stream.get_reader()
            return await async_aiohttp_proxy_stream(
                self.hass,
                request,
                stream_reader,
                self._ffmpeg.ffmpeg_stream_content_type,
            )
        finally:
            await stream.close()

    @Throttle(MIN_TIME_BETWEEN_SESSION_RENEW)
    def renew_live_stream_session(self):
        """Renew live stream session."""
        self._live_stream_session = self._data.get_live_stream_session(self._device)
