"""Component to interface with cameras."""
from __future__ import annotations

import asyncio
import base64
import collections
from collections.abc import Awaitable, Callable, Iterable, Mapping
from contextlib import suppress
from dataclasses import dataclass
from datetime import datetime, timedelta
from functools import partial
import hashlib
import inspect
import logging
import os
from random import SystemRandom
from typing import Final, Optional, cast, final

from aiohttp import web
import async_timeout
import attr
import voluptuous as vol

from homeassistant.components import websocket_api
from homeassistant.components.http import KEY_AUTHENTICATED, HomeAssistantView
from homeassistant.components.media_player.const import (
    ATTR_MEDIA_CONTENT_ID,
    ATTR_MEDIA_CONTENT_TYPE,
    ATTR_MEDIA_EXTRA,
    DOMAIN as DOMAIN_MP,
    SERVICE_PLAY_MEDIA,
)
from homeassistant.components.stream import Stream, create_stream
from homeassistant.components.stream.const import FORMAT_CONTENT_TYPE, OUTPUT_FORMATS
from homeassistant.components.websocket_api import ActiveConnection
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    ATTR_ENTITY_ID,
    CONF_FILENAME,
    CONTENT_TYPE_MULTIPART,
    EVENT_HOMEASSISTANT_START,
    SERVICE_TURN_OFF,
    SERVICE_TURN_ON,
)
from homeassistant.core import Event, HomeAssistant, ServiceCall, callback
from homeassistant.exceptions import HomeAssistantError
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.config_validation import (  # noqa: F401
    PLATFORM_SCHEMA,
    PLATFORM_SCHEMA_BASE,
)
from homeassistant.helpers.entity import Entity, EntityDescription, entity_sources
from homeassistant.helpers.entity_component import EntityComponent
from homeassistant.helpers.network import get_url
from homeassistant.helpers.typing import ConfigType
from homeassistant.loader import bind_hass

from .const import (
    CAMERA_IMAGE_TIMEOUT,
    CAMERA_STREAM_SOURCE_TIMEOUT,
    CONF_DURATION,
    CONF_LOOKBACK,
    DATA_CAMERA_PREFS,
    DATA_RTSP_TO_WEB_RTC,
    DOMAIN,
    SERVICE_RECORD,
    STREAM_TYPE_HLS,
    STREAM_TYPE_WEB_RTC,
)
from .img_util import scale_jpeg_camera_image
from .prefs import CameraPreferences

# mypy: allow-untyped-calls

_LOGGER = logging.getLogger(__name__)

SERVICE_ENABLE_MOTION: Final = "enable_motion_detection"
SERVICE_DISABLE_MOTION: Final = "disable_motion_detection"
SERVICE_SNAPSHOT: Final = "snapshot"
SERVICE_PLAY_STREAM: Final = "play_stream"

SCAN_INTERVAL: Final = timedelta(seconds=30)
ENTITY_ID_FORMAT: Final = DOMAIN + ".{}"

ATTR_FILENAME: Final = "filename"
ATTR_MEDIA_PLAYER: Final = "media_player"
ATTR_FORMAT: Final = "format"

STATE_RECORDING: Final = "recording"
STATE_STREAMING: Final = "streaming"
STATE_IDLE: Final = "idle"

# Bitfield of features supported by the camera entity
SUPPORT_ON_OFF: Final = 1
SUPPORT_STREAM: Final = 2

RTSP_PREFIXES = {"rtsp://", "rtsps://"}

DEFAULT_CONTENT_TYPE: Final = "image/jpeg"
ENTITY_IMAGE_URL: Final = "/api/camera_proxy/{0}?token={1}"

TOKEN_CHANGE_INTERVAL: Final = timedelta(minutes=5)
_RND: Final = SystemRandom()

MIN_STREAM_INTERVAL: Final = 0.5  # seconds

CAMERA_SERVICE_SNAPSHOT: Final = {vol.Required(ATTR_FILENAME): cv.template}

CAMERA_SERVICE_PLAY_STREAM: Final = {
    vol.Required(ATTR_MEDIA_PLAYER): cv.entities_domain(DOMAIN_MP),
    vol.Optional(ATTR_FORMAT, default="hls"): vol.In(OUTPUT_FORMATS),
}

CAMERA_SERVICE_RECORD: Final = {
    vol.Required(CONF_FILENAME): cv.template,
    vol.Optional(CONF_DURATION, default=30): vol.Coerce(int),
    vol.Optional(CONF_LOOKBACK, default=0): vol.Coerce(int),
}

WS_TYPE_CAMERA_THUMBNAIL: Final = "camera_thumbnail"
SCHEMA_WS_CAMERA_THUMBNAIL: Final = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
    {
        vol.Required("type"): WS_TYPE_CAMERA_THUMBNAIL,
        vol.Required("entity_id"): cv.entity_id,
    }
)


@dataclass
class CameraEntityDescription(EntityDescription):
    """A class that describes camera entities."""


@attr.s
class Image:
    """Represent an image."""

    content_type: str = attr.ib()
    content: bytes = attr.ib()


@bind_hass
async def async_request_stream(hass: HomeAssistant, entity_id: str, fmt: str) -> str:
    """Request a stream for a camera entity."""
    camera = _get_camera_from_entity_id(hass, entity_id)
    return await _async_stream_endpoint_url(hass, camera, fmt)


async def _async_get_image(
    camera: Camera,
    timeout: int = 10,
    width: int | None = None,
    height: int | None = None,
) -> Image:
    """Fetch a snapshot image from a camera.

    If width and height are passed, an attempt to scale
    the image will be made on a best effort basis.
    Not all cameras can scale images or return jpegs
    that we can scale, however the majority of cases
    are handled.
    """
    with suppress(asyncio.CancelledError, asyncio.TimeoutError):
        async with async_timeout.timeout(timeout):
            # Calling inspect will be removed in 2022.1 after all
            # custom components have had a chance to change their signature
            sig = inspect.signature(camera.async_camera_image)
            if "height" in sig.parameters and "width" in sig.parameters:
                image_bytes = await camera.async_camera_image(
                    width=width, height=height
                )
            else:
                camera.async_warn_old_async_camera_image_signature()
                image_bytes = await camera.async_camera_image()

            if image_bytes:
                content_type = camera.content_type
                image = Image(content_type, image_bytes)
                if (
                    width is not None
                    and height is not None
                    and ("jpeg" in content_type or "jpg" in content_type)
                ):
                    assert width is not None
                    assert height is not None
                    return Image(
                        content_type, scale_jpeg_camera_image(image, width, height)
                    )

                return image

    raise HomeAssistantError("Unable to get image")


@bind_hass
async def async_get_image(
    hass: HomeAssistant,
    entity_id: str,
    timeout: int = 10,
    width: int | None = None,
    height: int | None = None,
) -> Image:
    """Fetch an image from a camera entity.

    width and height will be passed to the underlying camera.
    """
    camera = _get_camera_from_entity_id(hass, entity_id)
    return await _async_get_image(camera, timeout, width, height)


@bind_hass
async def async_get_stream_source(hass: HomeAssistant, entity_id: str) -> str | None:
    """Fetch the stream source for a camera entity."""
    camera = _get_camera_from_entity_id(hass, entity_id)
    return await camera.stream_source()


@bind_hass
async def async_get_mjpeg_stream(
    hass: HomeAssistant, request: web.Request, entity_id: str
) -> web.StreamResponse | None:
    """Fetch an mjpeg stream from a camera entity."""
    camera = _get_camera_from_entity_id(hass, entity_id)

    try:
        stream = await camera.handle_async_mjpeg_stream(request)
    except ConnectionResetError:
        stream = None
        _LOGGER.debug("Error while writing MJPEG stream to transport")
    return stream


async def async_get_still_stream(
    request: web.Request,
    image_cb: Callable[[], Awaitable[bytes | None]],
    content_type: str,
    interval: float,
) -> web.StreamResponse:
    """Generate an HTTP MJPEG stream from camera images.

    This method must be run in the event loop.
    """
    response = web.StreamResponse()
    response.content_type = CONTENT_TYPE_MULTIPART.format("--frameboundary")
    await response.prepare(request)

    async def write_to_mjpeg_stream(img_bytes: bytes) -> None:
        """Write image to stream."""
        await response.write(
            bytes(
                "--frameboundary\r\n"
                "Content-Type: {}\r\n"
                "Content-Length: {}\r\n\r\n".format(content_type, len(img_bytes)),
                "utf-8",
            )
            + img_bytes
            + b"\r\n"
        )

    last_image = None

    while True:
        img_bytes = await image_cb()
        if not img_bytes:
            break

        if img_bytes != last_image:
            await write_to_mjpeg_stream(img_bytes)

            # Chrome seems to always ignore first picture,
            # print it twice.
            if last_image is None:
                await write_to_mjpeg_stream(img_bytes)
            last_image = img_bytes

        await asyncio.sleep(interval)

    return response


def _get_camera_from_entity_id(hass: HomeAssistant, entity_id: str) -> Camera:
    """Get camera component from entity_id."""
    if (component := hass.data.get(DOMAIN)) is None:
        raise HomeAssistantError("Camera integration not set up")

    if (camera := component.get_entity(entity_id)) is None:
        raise HomeAssistantError("Camera not found")

    if not camera.is_on:
        raise HomeAssistantError("Camera is off")

    return cast(Camera, camera)


# An RtspToWebRtcProvider accepts these inputs:
#     stream_source: The RTSP url
#     offer_sdp: The WebRTC SDP offer
#     stream_id: A unique id for the stream, used to update an existing source
# The output is the SDP answer, or None if the source or offer is not eligible.
# The Callable may throw HomeAssistantError on failure.
RtspToWebRtcProviderType = Callable[[str, str, str], Awaitable[Optional[str]]]


def async_register_rtsp_to_web_rtc_provider(
    hass: HomeAssistant,
    domain: str,
    provider: RtspToWebRtcProviderType,
) -> Callable[[], None]:
    """Register an RTSP to WebRTC provider.

    The first provider to satisfy the offer will be used.
    """
    if DOMAIN not in hass.data:
        raise ValueError("Unexpected state, camera not loaded")

    def remove_provider() -> None:
        if domain in hass.data[DATA_RTSP_TO_WEB_RTC]:
            del hass.data[DATA_RTSP_TO_WEB_RTC]
        hass.async_create_task(_async_refresh_providers(hass))

    hass.data.setdefault(DATA_RTSP_TO_WEB_RTC, {})
    hass.data[DATA_RTSP_TO_WEB_RTC][domain] = provider
    hass.async_create_task(_async_refresh_providers(hass))
    return remove_provider


async def _async_refresh_providers(hass: HomeAssistant) -> None:
    """Check all cameras for any state changes for registered providers."""

    component: EntityComponent = hass.data[DOMAIN]
    await asyncio.gather(
        *(
            cast(Camera, camera).async_refresh_providers()
            for camera in component.entities
        )
    )


def _async_get_rtsp_to_web_rtc_providers(
    hass: HomeAssistant,
) -> Iterable[RtspToWebRtcProviderType]:
    """Return registered RTSP to WebRTC providers."""
    providers: dict[str, RtspToWebRtcProviderType] = hass.data.get(
        DATA_RTSP_TO_WEB_RTC, {}
    )
    return providers.values()


async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
    """Set up the camera component."""
    component = hass.data[DOMAIN] = EntityComponent(
        _LOGGER, DOMAIN, hass, SCAN_INTERVAL
    )

    prefs = CameraPreferences(hass)
    await prefs.async_initialize()
    hass.data[DATA_CAMERA_PREFS] = prefs

    hass.http.register_view(CameraImageView(component))
    hass.http.register_view(CameraMjpegStream(component))
    websocket_api.async_register_command(
        hass,
        WS_TYPE_CAMERA_THUMBNAIL,
        websocket_camera_thumbnail,
        SCHEMA_WS_CAMERA_THUMBNAIL,
    )
    websocket_api.async_register_command(hass, ws_camera_stream)
    websocket_api.async_register_command(hass, ws_camera_web_rtc_offer)
    websocket_api.async_register_command(hass, websocket_get_prefs)
    websocket_api.async_register_command(hass, websocket_update_prefs)

    await component.async_setup(config)

    async def preload_stream(_event: Event) -> None:
        for camera in component.entities:
            camera = cast(Camera, camera)
            camera_prefs = prefs.get(camera.entity_id)
            if not camera_prefs.preload_stream:
                continue
            stream = await camera.async_create_stream()
            if not stream:
                continue
            stream.keepalive = True
            stream.add_provider("hls")
            stream.start()

    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_START, preload_stream)

    @callback
    def update_tokens(time: datetime) -> None:
        """Update tokens of the entities."""
        for entity in component.entities:
            entity = cast(Camera, entity)
            entity.async_update_token()
            entity.async_write_ha_state()

    hass.helpers.event.async_track_time_interval(update_tokens, TOKEN_CHANGE_INTERVAL)

    component.async_register_entity_service(
        SERVICE_ENABLE_MOTION, {}, "async_enable_motion_detection"
    )
    component.async_register_entity_service(
        SERVICE_DISABLE_MOTION, {}, "async_disable_motion_detection"
    )
    component.async_register_entity_service(SERVICE_TURN_OFF, {}, "async_turn_off")
    component.async_register_entity_service(SERVICE_TURN_ON, {}, "async_turn_on")
    component.async_register_entity_service(
        SERVICE_SNAPSHOT, CAMERA_SERVICE_SNAPSHOT, async_handle_snapshot_service
    )
    component.async_register_entity_service(
        SERVICE_PLAY_STREAM,
        CAMERA_SERVICE_PLAY_STREAM,
        async_handle_play_stream_service,
    )
    component.async_register_entity_service(
        SERVICE_RECORD, CAMERA_SERVICE_RECORD, async_handle_record_service
    )

    return True


async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Set up a config entry."""
    component: EntityComponent = hass.data[DOMAIN]
    return await component.async_setup_entry(entry)


async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
    """Unload a config entry."""
    component: EntityComponent = hass.data[DOMAIN]
    return await component.async_unload_entry(entry)


class Camera(Entity):
    """The base class for camera entities."""

    # Entity Properties
    _attr_brand: str | None = None
    _attr_frame_interval: float = MIN_STREAM_INTERVAL
    _attr_frontend_stream_type: str | None
    _attr_is_on: bool = True
    _attr_is_recording: bool = False
    _attr_is_streaming: bool = False
    _attr_model: str | None = None
    _attr_motion_detection_enabled: bool = False
    _attr_should_poll: bool = False  # No need to poll cameras
    _attr_state: None = None  # State is determined by is_on
    _attr_supported_features: int = 0

    def __init__(self) -> None:
        """Initialize a camera."""
        self.stream: Stream | None = None
        self.stream_options: dict[str, str] = {}
        self.content_type: str = DEFAULT_CONTENT_TYPE
        self.access_tokens: collections.deque = collections.deque([], 2)
        self._warned_old_signature = False
        self.async_update_token()
        self._create_stream_lock: asyncio.Lock | None = None
        self._rtsp_to_webrtc = False

    @property
    def entity_picture(self) -> str:
        """Return a link to the camera feed as entity picture."""
        if self._attr_entity_picture is not None:
            return self._attr_entity_picture
        return ENTITY_IMAGE_URL.format(self.entity_id, self.access_tokens[-1])

    @property
    def supported_features(self) -> int:
        """Flag supported features."""
        return self._attr_supported_features

    @property
    def is_recording(self) -> bool:
        """Return true if the device is recording."""
        return self._attr_is_recording

    @property
    def is_streaming(self) -> bool:
        """Return true if the device is streaming."""
        return self._attr_is_streaming

    @property
    def brand(self) -> str | None:
        """Return the camera brand."""
        return self._attr_brand

    @property
    def motion_detection_enabled(self) -> bool:
        """Return the camera motion detection status."""
        return self._attr_motion_detection_enabled

    @property
    def model(self) -> str | None:
        """Return the camera model."""
        return self._attr_model

    @property
    def frame_interval(self) -> float:
        """Return the interval between frames of the mjpeg stream."""
        return self._attr_frame_interval

    @property
    def frontend_stream_type(self) -> str | None:
        """Return the type of stream supported by this camera.

        A camera may have a single stream type which is used to inform the
        frontend which camera attributes and player to use. The default type
        is to use HLS, and components can override to change the type.
        """
        if hasattr(self, "_attr_frontend_stream_type"):
            return self._attr_frontend_stream_type
        if not self.supported_features & SUPPORT_STREAM:
            return None
        if self._rtsp_to_webrtc:
            return STREAM_TYPE_WEB_RTC
        return STREAM_TYPE_HLS

    @property
    def available(self) -> bool:
        """Return True if entity is available."""
        if self.stream and not self.stream.available:
            return self.stream.available
        return super().available

    async def async_create_stream(self) -> Stream | None:
        """Create a Stream for stream_source."""
        # There is at most one stream (a decode worker) per camera
        if not self._create_stream_lock:
            self._create_stream_lock = asyncio.Lock()
        async with self._create_stream_lock:
            if not self.stream:
                async with async_timeout.timeout(CAMERA_STREAM_SOURCE_TIMEOUT):
                    source = await self.stream_source()
                if not source:
                    return None
                self.stream = create_stream(
                    self.hass,
                    source,
                    options=self.stream_options,
                    stream_label=self.entity_id,
                )
                self.stream.set_update_callback(self.async_write_ha_state)
            return self.stream

    async def stream_source(self) -> str | None:
        """Return the source of the stream.

        This is used by cameras with SUPPORT_STREAM and STREAM_TYPE_HLS.
        """
        # pylint: disable=no-self-use
        return None

    async def async_handle_web_rtc_offer(self, offer_sdp: str) -> str | None:
        """Handle the WebRTC offer and return an answer.

        This is used by cameras with SUPPORT_STREAM and STREAM_TYPE_WEB_RTC.

        Integrations can override with a native WebRTC implementation.
        """
        stream_source = await self.stream_source()
        if not stream_source:
            return None
        for provider in _async_get_rtsp_to_web_rtc_providers(self.hass):
            answer_sdp = await provider(stream_source, offer_sdp, self.entity_id)
            if answer_sdp:
                return answer_sdp
        raise HomeAssistantError("WebRTC offer was not accepted by any providers")

    def camera_image(
        self, width: int | None = None, height: int | None = None
    ) -> bytes | None:
        """Return bytes of camera image."""
        raise NotImplementedError()

    async def async_camera_image(
        self, width: int | None = None, height: int | None = None
    ) -> bytes | None:
        """Return bytes of camera image."""
        sig = inspect.signature(self.camera_image)
        # Calling inspect will be removed in 2022.1 after all
        # custom components have had a chance to change their signature
        if "height" in sig.parameters and "width" in sig.parameters:
            return await self.hass.async_add_executor_job(
                partial(self.camera_image, width=width, height=height)
            )
        self.async_warn_old_async_camera_image_signature()
        return await self.hass.async_add_executor_job(self.camera_image)

    # Remove in 2022.1 after all custom components have had a chance to change their signature
    @callback
    def async_warn_old_async_camera_image_signature(self) -> None:
        """Warn once when calling async_camera_image with the function old signature."""
        if self._warned_old_signature:
            return
        _LOGGER.warning(
            "The camera entity %s does not support requesting width and height, please open an issue with the integration author",
            self.entity_id,
        )
        self._warned_old_signature = True

    async def handle_async_still_stream(
        self, request: web.Request, interval: float
    ) -> web.StreamResponse:
        """Generate an HTTP MJPEG stream from camera images."""
        return await async_get_still_stream(
            request, self.async_camera_image, self.content_type, interval
        )

    async def handle_async_mjpeg_stream(
        self, request: web.Request
    ) -> web.StreamResponse | None:
        """Serve an HTTP MJPEG stream from the camera.

        This method can be overridden by camera platforms to proxy
        a direct stream from the camera.
        """
        return await self.handle_async_still_stream(request, self.frame_interval)

    @property
    @final
    def state(self) -> str:
        """Return the camera state."""
        if self.is_recording:
            return STATE_RECORDING
        if self.is_streaming:
            return STATE_STREAMING
        return STATE_IDLE

    @property
    def is_on(self) -> bool:
        """Return true if on."""
        return self._attr_is_on

    def turn_off(self) -> None:
        """Turn off camera."""
        raise NotImplementedError()

    async def async_turn_off(self) -> None:
        """Turn off camera."""
        await self.hass.async_add_executor_job(self.turn_off)

    def turn_on(self) -> None:
        """Turn off camera."""
        raise NotImplementedError()

    async def async_turn_on(self) -> None:
        """Turn off camera."""
        await self.hass.async_add_executor_job(self.turn_on)

    def enable_motion_detection(self) -> None:
        """Enable motion detection in the camera."""
        raise NotImplementedError()

    async def async_enable_motion_detection(self) -> None:
        """Call the job and enable motion detection."""
        await self.hass.async_add_executor_job(self.enable_motion_detection)

    def disable_motion_detection(self) -> None:
        """Disable motion detection in camera."""
        raise NotImplementedError()

    async def async_disable_motion_detection(self) -> None:
        """Call the job and disable motion detection."""
        await self.hass.async_add_executor_job(self.disable_motion_detection)

    @final
    @property
    def state_attributes(self) -> dict[str, str | None]:
        """Return the camera state attributes."""
        attrs = {"access_token": self.access_tokens[-1]}

        if self.model:
            attrs["model_name"] = self.model

        if self.brand:
            attrs["brand"] = self.brand

        if self.motion_detection_enabled:
            attrs["motion_detection"] = self.motion_detection_enabled

        if self.frontend_stream_type:
            attrs["frontend_stream_type"] = self.frontend_stream_type

        return attrs

    @callback
    def async_update_token(self) -> None:
        """Update the used token."""
        self.access_tokens.append(
            hashlib.sha256(_RND.getrandbits(256).to_bytes(32, "little")).hexdigest()
        )

    async def async_internal_added_to_hass(self) -> None:
        """Run when entity about to be added to hass."""
        await super().async_internal_added_to_hass()
        await self.async_refresh_providers()

    async def async_refresh_providers(self) -> None:
        """Determine if any of the registered providers are suitable for this entity.

        This affects state attributes, so it should be invoked any time the registered
        providers or inputs to the state attributes change.

        Returns True if any state was updated (and needs to be written)
        """
        old_state = self._rtsp_to_webrtc
        self._rtsp_to_webrtc = await self._async_use_rtsp_to_webrtc()
        if old_state != self._rtsp_to_webrtc:
            self.async_write_ha_state()

    async def _async_use_rtsp_to_webrtc(self) -> bool:
        """Determine if a WebRTC provider can be used for the camera."""
        if not self.supported_features & SUPPORT_STREAM:
            return False
        if DATA_RTSP_TO_WEB_RTC not in self.hass.data:
            return False
        stream_source = await self.stream_source()
        return any(
            stream_source and stream_source.startswith(prefix)
            for prefix in RTSP_PREFIXES
        )


class CameraView(HomeAssistantView):
    """Base CameraView."""

    requires_auth = False

    def __init__(self, component: EntityComponent) -> None:
        """Initialize a basic camera view."""
        self.component = component

    async def get(self, request: web.Request, entity_id: str) -> web.StreamResponse:
        """Start a GET request."""
        if (camera := self.component.get_entity(entity_id)) is None:
            raise web.HTTPNotFound()

        camera = cast(Camera, camera)

        authenticated = (
            request[KEY_AUTHENTICATED]
            or request.query.get("token") in camera.access_tokens
        )

        if not authenticated:
            raise web.HTTPUnauthorized()

        if not camera.is_on:
            _LOGGER.debug("Camera is off")
            raise web.HTTPServiceUnavailable()

        return await self.handle(request, camera)

    async def handle(self, request: web.Request, camera: Camera) -> web.StreamResponse:
        """Handle the camera request."""
        raise NotImplementedError()


class CameraImageView(CameraView):
    """Camera view to serve an image."""

    url = "/api/camera_proxy/{entity_id}"
    name = "api:camera:image"

    async def handle(self, request: web.Request, camera: Camera) -> web.Response:
        """Serve camera image."""
        width = request.query.get("width")
        height = request.query.get("height")
        try:
            image = await _async_get_image(
                camera,
                CAMERA_IMAGE_TIMEOUT,
                int(width) if width else None,
                int(height) if height else None,
            )
        except (HomeAssistantError, ValueError) as ex:
            raise web.HTTPInternalServerError() from ex
        else:
            return web.Response(body=image.content, content_type=image.content_type)


class CameraMjpegStream(CameraView):
    """Camera View to serve an MJPEG stream."""

    url = "/api/camera_proxy_stream/{entity_id}"
    name = "api:camera:stream"

    async def handle(self, request: web.Request, camera: Camera) -> web.StreamResponse:
        """Serve camera stream, possibly with interval."""
        if (interval_str := request.query.get("interval")) is None:
            try:
                stream = await camera.handle_async_mjpeg_stream(request)
            except ConnectionResetError:
                stream = None
                _LOGGER.debug("Error while writing MJPEG stream to transport")
            if stream is None:
                raise web.HTTPBadGateway()
            return stream

        try:
            # Compose camera stream from stills
            interval = float(interval_str)
            if interval < MIN_STREAM_INTERVAL:
                raise ValueError(f"Stream interval must be be > {MIN_STREAM_INTERVAL}")
            return await camera.handle_async_still_stream(request, interval)
        except ValueError as err:
            raise web.HTTPBadRequest() from err


@websocket_api.async_response
async def websocket_camera_thumbnail(
    hass: HomeAssistant, connection: ActiveConnection, msg: dict
) -> None:
    """Handle get camera thumbnail websocket command.

    Async friendly.
    """
    _LOGGER.warning("The websocket command 'camera_thumbnail' has been deprecated")
    try:
        image = await async_get_image(hass, msg["entity_id"])
        await connection.send_big_result(
            msg["id"],
            {
                "content_type": image.content_type,
                "content": base64.b64encode(image.content).decode("utf-8"),
            },
        )
    except HomeAssistantError:
        connection.send_message(
            websocket_api.error_message(
                msg["id"], "image_fetch_failed", "Unable to fetch image"
            )
        )


@websocket_api.websocket_command(
    {
        vol.Required("type"): "camera/stream",
        vol.Required("entity_id"): cv.entity_id,
        vol.Optional("format", default="hls"): vol.In(OUTPUT_FORMATS),
    }
)
@websocket_api.async_response
async def ws_camera_stream(
    hass: HomeAssistant, connection: ActiveConnection, msg: dict
) -> None:
    """Handle get camera stream websocket command.

    Async friendly.
    """
    try:
        entity_id = msg["entity_id"]
        camera = _get_camera_from_entity_id(hass, entity_id)
        url = await _async_stream_endpoint_url(hass, camera, fmt=msg["format"])
        connection.send_result(msg["id"], {"url": url})
    except HomeAssistantError as ex:
        _LOGGER.error("Error requesting stream: %s", ex)
        connection.send_error(msg["id"], "start_stream_failed", str(ex))
    except asyncio.TimeoutError:
        _LOGGER.error("Timeout getting stream source")
        connection.send_error(
            msg["id"], "start_stream_failed", "Timeout getting stream source"
        )


@websocket_api.websocket_command(
    {
        vol.Required("type"): "camera/web_rtc_offer",
        vol.Required("entity_id"): cv.entity_id,
        vol.Required("offer"): str,
    }
)
@websocket_api.async_response
async def ws_camera_web_rtc_offer(
    hass: HomeAssistant, connection: ActiveConnection, msg: dict
) -> None:
    """Handle the signal path for a WebRTC stream.

    This signal path is used to route the offer created by the client to the
    camera device through the integration for negotiation on initial setup,
    which returns an answer. The actual streaming is handled entirely between
    the client and camera device.

    Async friendly.
    """
    entity_id = msg["entity_id"]
    offer = msg["offer"]
    camera = _get_camera_from_entity_id(hass, entity_id)
    if camera.frontend_stream_type != STREAM_TYPE_WEB_RTC:
        connection.send_error(
            msg["id"],
            "web_rtc_offer_failed",
            f"Camera does not support WebRTC, frontend_stream_type={camera.frontend_stream_type}",
        )
        return
    try:
        answer = await camera.async_handle_web_rtc_offer(offer)
    except (HomeAssistantError, ValueError) as ex:
        _LOGGER.error("Error handling WebRTC offer: %s", ex)
        connection.send_error(msg["id"], "web_rtc_offer_failed", str(ex))
    except asyncio.TimeoutError:
        _LOGGER.error("Timeout handling WebRTC offer")
        connection.send_error(
            msg["id"], "web_rtc_offer_failed", "Timeout handling WebRTC offer"
        )
    else:
        connection.send_result(msg["id"], {"answer": answer})


@websocket_api.websocket_command(
    {vol.Required("type"): "camera/get_prefs", vol.Required("entity_id"): cv.entity_id}
)
@websocket_api.async_response
async def websocket_get_prefs(
    hass: HomeAssistant, connection: ActiveConnection, msg: dict
) -> None:
    """Handle request for account info."""
    prefs = hass.data[DATA_CAMERA_PREFS].get(msg["entity_id"])
    connection.send_result(msg["id"], prefs.as_dict())


@websocket_api.websocket_command(
    {
        vol.Required("type"): "camera/update_prefs",
        vol.Required("entity_id"): cv.entity_id,
        vol.Optional("preload_stream"): bool,
    }
)
@websocket_api.async_response
async def websocket_update_prefs(
    hass: HomeAssistant, connection: ActiveConnection, msg: dict
) -> None:
    """Handle request for account info."""
    prefs = hass.data[DATA_CAMERA_PREFS]

    changes = dict(msg)
    changes.pop("id")
    changes.pop("type")
    entity_id = changes.pop("entity_id")
    await prefs.async_update(entity_id, **changes)

    connection.send_result(msg["id"], prefs.get(entity_id).as_dict())


async def async_handle_snapshot_service(
    camera: Camera, service_call: ServiceCall
) -> None:
    """Handle snapshot services calls."""
    hass = camera.hass
    filename = service_call.data[ATTR_FILENAME]
    filename.hass = hass

    snapshot_file = filename.async_render(variables={ATTR_ENTITY_ID: camera})

    # check if we allow to access to that file
    if not hass.config.is_allowed_path(snapshot_file):
        _LOGGER.error("Can't write %s, no access to path!", snapshot_file)
        return

    image = await camera.async_camera_image()

    if image is None:
        return

    def _write_image(to_file: str, image_data: bytes) -> None:
        """Executor helper to write image."""
        os.makedirs(os.path.dirname(to_file), exist_ok=True)
        with open(to_file, "wb") as img_file:
            img_file.write(image_data)

    try:
        await hass.async_add_executor_job(_write_image, snapshot_file, image)
    except OSError as err:
        _LOGGER.error("Can't write image to file: %s", err)


async def async_handle_play_stream_service(
    camera: Camera, service_call: ServiceCall
) -> None:
    """Handle play stream services calls."""
    fmt = service_call.data[ATTR_FORMAT]
    url = await _async_stream_endpoint_url(camera.hass, camera, fmt)

    hass = camera.hass
    data: Mapping[str, str] = {
        ATTR_MEDIA_CONTENT_ID: f"{get_url(hass)}{url}",
        ATTR_MEDIA_CONTENT_TYPE: FORMAT_CONTENT_TYPE[fmt],
    }

    # It is required to send a different payload for cast media players
    entity_ids = service_call.data[ATTR_MEDIA_PLAYER]
    sources = entity_sources(hass)
    cast_entity_ids = [
        entity
        for entity in entity_ids
        # All entities should be in sources. This extra guard is to
        # avoid people writing to the state machine and breaking it.
        if entity in sources and sources[entity]["domain"] == "cast"
    ]
    other_entity_ids = list(set(entity_ids) - set(cast_entity_ids))

    if cast_entity_ids:
        await hass.services.async_call(
            DOMAIN_MP,
            SERVICE_PLAY_MEDIA,
            {
                ATTR_ENTITY_ID: cast_entity_ids,
                **data,
                ATTR_MEDIA_EXTRA: {
                    "stream_type": "LIVE",
                    "media_info": {
                        "hlsVideoSegmentFormat": "fmp4",
                    },
                },
            },
            blocking=True,
            context=service_call.context,
        )

    if other_entity_ids:
        await hass.services.async_call(
            DOMAIN_MP,
            SERVICE_PLAY_MEDIA,
            {
                ATTR_ENTITY_ID: other_entity_ids,
                **data,
            },
            blocking=True,
            context=service_call.context,
        )


async def _async_stream_endpoint_url(
    hass: HomeAssistant, camera: Camera, fmt: str
) -> str:
    stream = await camera.async_create_stream()
    if not stream:
        raise HomeAssistantError(
            f"{camera.entity_id} does not support play stream service"
        )

    # Update keepalive setting which manages idle shutdown
    camera_prefs = hass.data[DATA_CAMERA_PREFS].get(camera.entity_id)
    stream.keepalive = camera_prefs.preload_stream

    stream.add_provider(fmt)
    stream.start()
    return stream.endpoint_url(fmt)


async def async_handle_record_service(
    camera: Camera, service_call: ServiceCall
) -> None:
    """Handle stream recording service calls."""
    stream = await camera.async_create_stream()

    if not stream:
        raise HomeAssistantError(f"{camera.entity_id} does not support record service")

    hass = camera.hass
    filename = service_call.data[CONF_FILENAME]
    filename.hass = hass
    video_path = filename.async_render(variables={ATTR_ENTITY_ID: camera})

    await stream.async_record(
        video_path,
        duration=service_call.data[CONF_DURATION],
        lookback=service_call.data[CONF_LOOKBACK],
    )
