"""ONVIF device abstraction."""
import asyncio
import datetime as dt
import os
from typing import List

from aiohttp.client_exceptions import ClientConnectionError, ServerDisconnectedError
import onvif
from onvif import ONVIFCamera
from onvif.exceptions import ONVIFError
from zeep.exceptions import Fault

from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONF_HOST,
    CONF_NAME,
    CONF_PASSWORD,
    CONF_PORT,
    CONF_USERNAME,
)
from homeassistant.core import HomeAssistant
import homeassistant.util.dt as dt_util

from .const import (
    ABSOLUTE_MOVE,
    CONTINUOUS_MOVE,
    GOTOPRESET_MOVE,
    LOGGER,
    PAN_FACTOR,
    RELATIVE_MOVE,
    TILT_FACTOR,
    ZOOM_FACTOR,
)
from .event import EventManager
from .models import PTZ, Capabilities, DeviceInfo, Profile, Resolution, Video


class ONVIFDevice:
    """Manages an ONVIF device."""

    def __init__(self, hass: HomeAssistant, config_entry: ConfigEntry = None):
        """Initialize the device."""
        self.hass: HomeAssistant = hass
        self.config_entry: ConfigEntry = config_entry
        self.available: bool = True

        self.device: ONVIFCamera = None
        self.events: EventManager = None

        self.info: DeviceInfo = DeviceInfo()
        self.capabilities: Capabilities = Capabilities()
        self.profiles: List[Profile] = []
        self.max_resolution: int = 0

        self._dt_diff_seconds: int = 0

    @property
    def name(self) -> str:
        """Return the name of this device."""
        return self.config_entry.data[CONF_NAME]

    @property
    def host(self) -> str:
        """Return the host of this device."""
        return self.config_entry.data[CONF_HOST]

    @property
    def port(self) -> int:
        """Return the port of this device."""
        return self.config_entry.data[CONF_PORT]

    @property
    def username(self) -> int:
        """Return the username of this device."""
        return self.config_entry.data[CONF_USERNAME]

    @property
    def password(self) -> int:
        """Return the password of this device."""
        return self.config_entry.data[CONF_PASSWORD]

    async def async_setup(self) -> bool:
        """Set up the device."""
        self.device = get_device(
            self.hass,
            host=self.config_entry.data[CONF_HOST],
            port=self.config_entry.data[CONF_PORT],
            username=self.config_entry.data[CONF_USERNAME],
            password=self.config_entry.data[CONF_PASSWORD],
        )

        # Get all device info
        try:
            await self.device.update_xaddrs()
            await self.async_check_date_and_time()
            self.info = await self.async_get_device_info()
            self.capabilities = await self.async_get_capabilities()
            self.profiles = await self.async_get_profiles()

            if self.capabilities.ptz:
                self.device.create_ptz_service()

            if self._dt_diff_seconds > 300 and self.capabilities.events:
                self.capabilities.events = False
                LOGGER.warning(
                    "The system clock on '%s' is more than 5 minutes off. "
                    "Although this device supports events, they will be "
                    "disabled until the device clock is fixed as we will "
                    "not be able to renew the subscription.",
                    self.name,
                )

            if self.capabilities.events:
                self.events = EventManager(
                    self.hass, self.device, self.config_entry.unique_id
                )

            # Determine max resolution from profiles
            self.max_resolution = max(
                profile.video.resolution.width
                for profile in self.profiles
                if profile.video.encoding == "H264"
            )
        except ClientConnectionError as err:
            LOGGER.warning(
                "Couldn't connect to camera '%s', but will retry later. Error: %s",
                self.name,
                err,
            )
            self.available = False
        except Fault as err:
            LOGGER.error(
                "Couldn't connect to camera '%s', please verify "
                "that the credentials are correct. Error: %s",
                self.name,
                err,
            )
            return False

        return True

    async def async_stop(self, event=None):
        """Shut it all down."""
        if self.events:
            await self.events.async_stop()
        await self.device.close()

    async def async_check_date_and_time(self) -> None:
        """Warns if device and system date not synced."""
        LOGGER.debug("Setting up the ONVIF device management service")
        device_mgmt = self.device.create_devicemgmt_service()

        LOGGER.debug("Retrieving current device date/time")
        try:
            system_date = dt_util.utcnow()
            device_time = await device_mgmt.GetSystemDateAndTime()
            if not device_time:
                LOGGER.debug(
                    """Couldn't get device '%s' date/time.
                    GetSystemDateAndTime() return null/empty""",
                    self.name,
                )
                return

            if device_time.UTCDateTime:
                tzone = dt_util.UTC
                cdate = device_time.UTCDateTime
            else:
                tzone = (
                    dt_util.get_time_zone(device_time.TimeZone)
                    or dt_util.DEFAULT_TIME_ZONE
                )
                cdate = device_time.LocalDateTime

            if cdate is None:
                LOGGER.warning("Could not retrieve date/time on this camera")
            else:
                cam_date = dt.datetime(
                    cdate.Date.Year,
                    cdate.Date.Month,
                    cdate.Date.Day,
                    cdate.Time.Hour,
                    cdate.Time.Minute,
                    cdate.Time.Second,
                    0,
                    tzone,
                )

                cam_date_utc = cam_date.astimezone(dt_util.UTC)

                LOGGER.debug(
                    "Device date/time: %s | System date/time: %s",
                    cam_date_utc,
                    system_date,
                )

                dt_diff = cam_date - system_date
                self._dt_diff_seconds = dt_diff.total_seconds()

                if self._dt_diff_seconds > 5:
                    LOGGER.warning(
                        "The date/time on the device (UTC) is '%s', "
                        "which is different from the system '%s', "
                        "this could lead to authentication issues",
                        cam_date_utc,
                        system_date,
                    )
        except ServerDisconnectedError as err:
            LOGGER.warning(
                "Couldn't get device '%s' date/time. Error: %s", self.name, err
            )

    async def async_get_device_info(self) -> DeviceInfo:
        """Obtain information about this device."""
        device_mgmt = self.device.create_devicemgmt_service()
        device_info = await device_mgmt.GetDeviceInformation()

        # Grab the last MAC address for backwards compatibility
        mac = None
        try:
            network_interfaces = await device_mgmt.GetNetworkInterfaces()
            for interface in network_interfaces:
                if interface.Enabled:
                    mac = interface.Info.HwAddress
        except Fault as fault:
            if "not implemented" not in fault.message:
                raise fault

            LOGGER.debug(
                "Couldn't get network interfaces from ONVIF deivice '%s'. Error: %s",
                self.name,
                fault,
            )

        return DeviceInfo(
            device_info.Manufacturer,
            device_info.Model,
            device_info.FirmwareVersion,
            device_info.SerialNumber,
            mac,
        )

    async def async_get_capabilities(self):
        """Obtain information about the available services on the device."""
        snapshot = False
        try:
            media_service = self.device.create_media_service()
            media_capabilities = await media_service.GetServiceCapabilities()
            snapshot = media_capabilities and media_capabilities.SnapshotUri
        except (ONVIFError, Fault, ServerDisconnectedError):
            pass

        pullpoint = False
        try:
            event_service = self.device.create_events_service()
            event_capabilities = await event_service.GetServiceCapabilities()
            pullpoint = event_capabilities and event_capabilities.WSPullPointSupport
        except (ONVIFError, Fault):
            pass

        ptz = False
        try:
            self.device.get_definition("ptz")
            ptz = True
        except ONVIFError:
            pass

        return Capabilities(snapshot, pullpoint, ptz)

    async def async_get_profiles(self) -> List[Profile]:
        """Obtain media profiles for this device."""
        media_service = self.device.create_media_service()
        result = await media_service.GetProfiles()
        profiles = []
        for key, onvif_profile in enumerate(result):
            # Only add H264 profiles
            if (
                not onvif_profile.VideoEncoderConfiguration
                or onvif_profile.VideoEncoderConfiguration.Encoding != "H264"
            ):
                continue

            profile = Profile(
                key,
                onvif_profile.token,
                onvif_profile.Name,
                Video(
                    onvif_profile.VideoEncoderConfiguration.Encoding,
                    Resolution(
                        onvif_profile.VideoEncoderConfiguration.Resolution.Width,
                        onvif_profile.VideoEncoderConfiguration.Resolution.Height,
                    ),
                ),
            )

            # Configure PTZ options
            if onvif_profile.PTZConfiguration:
                profile.ptz = PTZ(
                    onvif_profile.PTZConfiguration.DefaultContinuousPanTiltVelocitySpace
                    is not None,
                    onvif_profile.PTZConfiguration.DefaultRelativePanTiltTranslationSpace
                    is not None,
                    onvif_profile.PTZConfiguration.DefaultAbsolutePantTiltPositionSpace
                    is not None,
                )

                try:
                    ptz_service = self.device.create_ptz_service()
                    presets = await ptz_service.GetPresets(profile.token)
                    profile.ptz.presets = [preset.token for preset in presets if preset]
                except (Fault, ServerDisconnectedError):
                    # It's OK if Presets aren't supported
                    profile.ptz.presets = []

            profiles.append(profile)

        return profiles

    async def async_get_snapshot_uri(self, profile: Profile) -> str:
        """Get the snapshot URI for a specified profile."""
        if not self.capabilities.snapshot:
            return None

        media_service = self.device.create_media_service()
        req = media_service.create_type("GetSnapshotUri")
        req.ProfileToken = profile.token
        result = await media_service.GetSnapshotUri(req)
        return result.Uri

    async def async_get_stream_uri(self, profile: Profile) -> str:
        """Get the stream URI for a specified profile."""
        media_service = self.device.create_media_service()
        req = media_service.create_type("GetStreamUri")
        req.ProfileToken = profile.token
        req.StreamSetup = {
            "Stream": "RTP-Unicast",
            "Transport": {"Protocol": "RTSP"},
        }
        result = await media_service.GetStreamUri(req)
        return result.Uri

    async def async_perform_ptz(
        self,
        profile: Profile,
        distance,
        speed,
        move_mode,
        continuous_duration,
        preset,
        pan=None,
        tilt=None,
        zoom=None,
    ):
        """Perform a PTZ action on the camera."""
        if not self.capabilities.ptz:
            LOGGER.warning("PTZ actions are not supported on device '%s'", self.name)
            return

        ptz_service = self.device.create_ptz_service()

        pan_val = distance * PAN_FACTOR.get(pan, 0)
        tilt_val = distance * TILT_FACTOR.get(tilt, 0)
        zoom_val = distance * ZOOM_FACTOR.get(zoom, 0)
        speed_val = speed
        preset_val = preset
        LOGGER.debug(
            "Calling %s PTZ | Pan = %4.2f | Tilt = %4.2f | Zoom = %4.2f | Speed = %4.2f | Preset = %s",
            move_mode,
            pan_val,
            tilt_val,
            zoom_val,
            speed_val,
            preset_val,
        )
        try:
            req = ptz_service.create_type(move_mode)
            req.ProfileToken = profile.token
            if move_mode == CONTINUOUS_MOVE:
                # Guard against unsupported operation
                if not profile.ptz.continuous:
                    LOGGER.warning(
                        "ContinuousMove not supported on device '%s'", self.name
                    )
                    return

                req.Velocity = {
                    "PanTilt": {"x": pan_val, "y": tilt_val},
                    "Zoom": {"x": zoom_val},
                }

                await ptz_service.ContinuousMove(req)
                await asyncio.sleep(continuous_duration)
                req = ptz_service.create_type("Stop")
                req.ProfileToken = profile.token
                await ptz_service.Stop({"ProfileToken": req.ProfileToken})
            elif move_mode == RELATIVE_MOVE:
                # Guard against unsupported operation
                if not profile.ptz.relative:
                    LOGGER.warning(
                        "ContinuousMove not supported on device '%s'", self.name
                    )
                    return

                req.Translation = {
                    "PanTilt": {"x": pan_val, "y": tilt_val},
                    "Zoom": {"x": zoom_val},
                }
                req.Speed = {
                    "PanTilt": {"x": speed_val, "y": speed_val},
                    "Zoom": {"x": speed_val},
                }
                await ptz_service.RelativeMove(req)
            elif move_mode == ABSOLUTE_MOVE:
                # Guard against unsupported operation
                if not profile.ptz.absolute:
                    LOGGER.warning(
                        "ContinuousMove not supported on device '%s'", self.name
                    )
                    return

                req.Position = {
                    "PanTilt": {"x": pan_val, "y": tilt_val},
                    "Zoom": {"x": zoom_val},
                }
                req.Speed = {
                    "PanTilt": {"x": speed_val, "y": speed_val},
                    "Zoom": {"x": speed_val},
                }
                await ptz_service.AbsoluteMove(req)
            elif move_mode == GOTOPRESET_MOVE:
                # Guard against unsupported operation
                if preset_val not in profile.ptz.presets:
                    LOGGER.warning(
                        "PTZ preset '%s' does not exist on device '%s'. Available Presets: %s",
                        preset_val,
                        self.name,
                        ", ".join(profile.ptz.presets),
                    )
                    return

                req.PresetToken = preset_val
                req.Speed = {
                    "PanTilt": {"x": speed_val, "y": speed_val},
                    "Zoom": {"x": speed_val},
                }
                await ptz_service.GotoPreset(req)
        except ONVIFError as err:
            if "Bad Request" in err.reason:
                LOGGER.warning("Device '%s' doesn't support PTZ.", self.name)
            else:
                LOGGER.error("Error trying to perform PTZ action: %s", err)


def get_device(hass, host, port, username, password) -> ONVIFCamera:
    """Get ONVIFCamera instance."""
    return ONVIFCamera(
        host,
        port,
        username,
        password,
        f"{os.path.dirname(onvif.__file__)}/wsdl/",
        no_cache=True,
    )
