"""
Support for Cameras with FFmpeg as decoder.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/camera.ffmpeg/
"""
import asyncio
import logging

import voluptuous as vol

from homeassistant.const import CONF_NAME
from homeassistant.components.camera import Camera, PLATFORM_SCHEMA
from homeassistant.components.ffmpeg import (
    DATA_FFMPEG, CONF_INPUT, CONF_EXTRA_ARGUMENTS)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.aiohttp_client import (
    async_aiohttp_proxy_stream)

_LOGGER = logging.getLogger(__name__)

DEPENDENCIES = ['ffmpeg']
DEFAULT_NAME = 'FFmpeg'

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_INPUT): cv.string,
    vol.Optional(CONF_EXTRA_ARGUMENTS): cv.string,
    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
})


async def async_setup_platform(hass, config, async_add_devices,
                               discovery_info=None):
    """Set up a FFmpeg camera."""
    if not hass.data[DATA_FFMPEG].async_run_test(config.get(CONF_INPUT)):
        return
    async_add_devices([FFmpegCamera(hass, config)])


class FFmpegCamera(Camera):
    """An implementation of an FFmpeg camera."""

    def __init__(self, hass, config):
        """Initialize a FFmpeg camera."""
        super().__init__()

        self._manager = hass.data[DATA_FFMPEG]
        self._name = config.get(CONF_NAME)
        self._input = config.get(CONF_INPUT)
        self._extra_arguments = config.get(CONF_EXTRA_ARGUMENTS)

    async def async_camera_image(self):
        """Return a still image response from the camera."""
        from haffmpeg import ImageFrame, IMAGE_JPEG
        ffmpeg = ImageFrame(self._manager.binary, loop=self.hass.loop)

        image = await asyncio.shield(ffmpeg.get_image(
            self._input, output_format=IMAGE_JPEG,
            extra_cmd=self._extra_arguments), loop=self.hass.loop)
        return image

    async def handle_async_mjpeg_stream(self, request):
        """Generate an HTTP MJPEG stream from the camera."""
        from haffmpeg import CameraMjpeg

        stream = CameraMjpeg(self._manager.binary, loop=self.hass.loop)
        await stream.open_camera(
            self._input, extra_cmd=self._extra_arguments)

        try:
            return await async_aiohttp_proxy_stream(
                self.hass, request, stream,
                'multipart/x-mixed-replace;boundary=ffserver')
        finally:
            await stream.close()

    @property
    def name(self):
        """Return the name of this camera."""
        return self._name