"""Platform that supports scanning iCloud."""
import logging
import os
import random

from pyicloud import PyiCloudService
from pyicloud.exceptions import (
    PyiCloudException,
    PyiCloudFailedLoginException,
    PyiCloudNoDevicesException,
)
import voluptuous as vol

from homeassistant.components.device_tracker import PLATFORM_SCHEMA
from homeassistant.components.device_tracker.const import (
    ATTR_ATTRIBUTES,
    ENTITY_ID_FORMAT,
)
from homeassistant.components.device_tracker.legacy import DeviceScanner
from homeassistant.components.zone import async_active_zone
from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.event import track_utc_time_change
from homeassistant.util import slugify
from homeassistant.util.async_ import run_callback_threadsafe
import homeassistant.util.dt as dt_util
from homeassistant.util.location import distance

from .const import (
    DOMAIN,
    SERVICE_LOST_IPHONE,
    SERVICE_RESET_ACCOUNT,
    SERVICE_SET_INTERVAL,
    SERVICE_UPDATE,
)

_LOGGER = logging.getLogger(__name__)

CONF_ACCOUNTNAME = "account_name"
CONF_MAX_INTERVAL = "max_interval"
CONF_GPS_ACCURACY_THRESHOLD = "gps_accuracy_threshold"

# entity attributes
ATTR_ACCOUNTNAME = "account_name"
ATTR_INTERVAL = "interval"
ATTR_DEVICENAME = "device_name"
ATTR_BATTERY = "battery"
ATTR_DISTANCE = "distance"
ATTR_DEVICESTATUS = "device_status"
ATTR_LOWPOWERMODE = "low_power_mode"
ATTR_BATTERYSTATUS = "battery_status"

ICLOUDTRACKERS = {}

_CONFIGURING = {}

DEVICESTATUSSET = [
    "features",
    "maxMsgChar",
    "darkWake",
    "fmlyShare",
    "deviceStatus",
    "remoteLock",
    "activationLocked",
    "deviceClass",
    "id",
    "deviceModel",
    "rawDeviceModel",
    "passcodeLength",
    "canWipeAfterLock",
    "trackingInfo",
    "location",
    "msg",
    "batteryLevel",
    "remoteWipe",
    "thisDevice",
    "snd",
    "prsId",
    "wipeInProgress",
    "lowPowerMode",
    "lostModeEnabled",
    "isLocating",
    "lostModeCapable",
    "mesg",
    "name",
    "batteryStatus",
    "lockedTimestamp",
    "lostTimestamp",
    "locationCapable",
    "deviceDisplayName",
    "lostDevice",
    "deviceColor",
    "wipedTimestamp",
    "modelDisplayName",
    "locationEnabled",
    "isMac",
    "locFoundEnabled",
]

DEVICESTATUSCODES = {
    "200": "online",
    "201": "offline",
    "203": "pending",
    "204": "unregistered",
}

SERVICE_SCHEMA = vol.Schema(
    {
        vol.Optional(ATTR_ACCOUNTNAME): vol.All(cv.ensure_list, [cv.slugify]),
        vol.Optional(ATTR_DEVICENAME): cv.slugify,
        vol.Optional(ATTR_INTERVAL): cv.positive_int,
    }
)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_USERNAME): cv.string,
        vol.Required(CONF_PASSWORD): cv.string,
        vol.Optional(ATTR_ACCOUNTNAME): cv.slugify,
        vol.Optional(CONF_MAX_INTERVAL, default=30): cv.positive_int,
        vol.Optional(CONF_GPS_ACCURACY_THRESHOLD, default=1000): cv.positive_int,
    }
)


def setup_scanner(hass, config: dict, see, discovery_info=None):
    """Set up the iCloud Scanner."""
    username = config.get(CONF_USERNAME)
    password = config.get(CONF_PASSWORD)
    account = config.get(CONF_ACCOUNTNAME, slugify(username.partition("@")[0]))
    max_interval = config.get(CONF_MAX_INTERVAL)
    gps_accuracy_threshold = config.get(CONF_GPS_ACCURACY_THRESHOLD)

    icloudaccount = Icloud(
        hass, username, password, account, max_interval, gps_accuracy_threshold, see
    )

    if icloudaccount.api is not None:
        ICLOUDTRACKERS[account] = icloudaccount

    else:
        _LOGGER.error("No ICLOUDTRACKERS added")
        return False

    def lost_iphone(call):
        """Call the lost iPhone function if the device is found."""
        accounts = call.data.get(ATTR_ACCOUNTNAME, ICLOUDTRACKERS)
        devicename = call.data.get(ATTR_DEVICENAME)
        for account in accounts:
            if account in ICLOUDTRACKERS:
                ICLOUDTRACKERS[account].lost_iphone(devicename)

    hass.services.register(
        DOMAIN, SERVICE_LOST_IPHONE, lost_iphone, schema=SERVICE_SCHEMA
    )

    def update_icloud(call):
        """Call the update function of an iCloud account."""
        accounts = call.data.get(ATTR_ACCOUNTNAME, ICLOUDTRACKERS)
        devicename = call.data.get(ATTR_DEVICENAME)
        for account in accounts:
            if account in ICLOUDTRACKERS:
                ICLOUDTRACKERS[account].update_icloud(devicename)

    hass.services.register(DOMAIN, SERVICE_UPDATE, update_icloud, schema=SERVICE_SCHEMA)

    def reset_account_icloud(call):
        """Reset an iCloud account."""
        accounts = call.data.get(ATTR_ACCOUNTNAME, ICLOUDTRACKERS)
        for account in accounts:
            if account in ICLOUDTRACKERS:
                ICLOUDTRACKERS[account].reset_account_icloud()

    hass.services.register(
        DOMAIN, SERVICE_RESET_ACCOUNT, reset_account_icloud, schema=SERVICE_SCHEMA
    )

    def setinterval(call):
        """Call the update function of an iCloud account."""
        accounts = call.data.get(ATTR_ACCOUNTNAME, ICLOUDTRACKERS)
        interval = call.data.get(ATTR_INTERVAL)
        devicename = call.data.get(ATTR_DEVICENAME)
        for account in accounts:
            if account in ICLOUDTRACKERS:
                ICLOUDTRACKERS[account].setinterval(interval, devicename)

    hass.services.register(
        DOMAIN, SERVICE_SET_INTERVAL, setinterval, schema=SERVICE_SCHEMA
    )

    # Tells the bootstrapper that the component was successfully initialized
    return True


class Icloud(DeviceScanner):
    """Representation of an iCloud account."""

    def __init__(
        self, hass, username, password, name, max_interval, gps_accuracy_threshold, see
    ):
        """Initialize an iCloud account."""
        self.hass = hass
        self.username = username
        self.password = password
        self.api = None
        self.accountname = name
        self.devices = {}
        self.seen_devices = {}
        self._overridestates = {}
        self._intervals = {}
        self._max_interval = max_interval
        self._gps_accuracy_threshold = gps_accuracy_threshold
        self.see = see

        self._trusted_device = None
        self._verification_code = None

        self._attrs = {}
        self._attrs[ATTR_ACCOUNTNAME] = name

        self.reset_account_icloud()

        randomseconds = random.randint(10, 59)
        track_utc_time_change(self.hass, self.keep_alive, second=randomseconds)

    def reset_account_icloud(self):
        """Reset an iCloud account."""
        icloud_dir = self.hass.config.path("icloud")
        if not os.path.exists(icloud_dir):
            os.makedirs(icloud_dir)

        try:
            self.api = PyiCloudService(
                self.username, self.password, cookie_directory=icloud_dir, verify=True
            )
        except PyiCloudFailedLoginException as error:
            self.api = None
            _LOGGER.error("Error logging into iCloud Service: %s", error)
            return

        try:
            self.devices = {}
            self._overridestates = {}
            self._intervals = {}
            for device in self.api.devices:
                status = device.status(DEVICESTATUSSET)
                _LOGGER.debug("Device Status is %s", status)
                devicename = slugify(status["name"].replace(" ", "", 99))
                _LOGGER.info("Adding icloud device: %s", devicename)
                if devicename in self.devices:
                    _LOGGER.error("Multiple devices with name: %s", devicename)
                    continue
                self.devices[devicename] = device
                self._intervals[devicename] = 1
                self._overridestates[devicename] = None
        except PyiCloudNoDevicesException:
            _LOGGER.error("No iCloud Devices found!")

    def icloud_trusted_device_callback(self, callback_data):
        """Handle chosen trusted devices."""
        self._trusted_device = int(callback_data.get("trusted_device"))
        self._trusted_device = self.api.trusted_devices[self._trusted_device]

        if not self.api.send_verification_code(self._trusted_device):
            _LOGGER.error("Failed to send verification code")
            self._trusted_device = None
            return

        if self.accountname in _CONFIGURING:
            request_id = _CONFIGURING.pop(self.accountname)
            configurator = self.hass.components.configurator
            configurator.request_done(request_id)

        # Trigger the next step immediately
        self.icloud_need_verification_code()

    def icloud_need_trusted_device(self):
        """We need a trusted device."""
        configurator = self.hass.components.configurator
        if self.accountname in _CONFIGURING:
            return

        devicesstring = ""
        devices = self.api.trusted_devices
        for i, device in enumerate(devices):
            devicename = device.get(
                "deviceName", "SMS to %s" % device.get("phoneNumber")
            )
            devicesstring += f"{i}: {devicename};"

        _CONFIGURING[self.accountname] = configurator.request_config(
            f"iCloud {self.accountname}",
            self.icloud_trusted_device_callback,
            description=(
                "Please choose your trusted device by entering"
                " the index from this list: " + devicesstring
            ),
            entity_picture="/static/images/config_icloud.png",
            submit_caption="Confirm",
            fields=[{"id": "trusted_device", "name": "Trusted Device"}],
        )

    def icloud_verification_callback(self, callback_data):
        """Handle the chosen trusted device."""
        self._verification_code = callback_data.get("code")

        try:
            if not self.api.validate_verification_code(
                self._trusted_device, self._verification_code
            ):
                raise PyiCloudException("Unknown failure")
        except PyiCloudException as error:
            # Reset to the initial 2FA state to allow the user to retry
            _LOGGER.error("Failed to verify verification code: %s", error)
            self._trusted_device = None
            self._verification_code = None

            # Trigger the next step immediately
            self.icloud_need_trusted_device()

        if self.accountname in _CONFIGURING:
            request_id = _CONFIGURING.pop(self.accountname)
            configurator = self.hass.components.configurator
            configurator.request_done(request_id)

    def icloud_need_verification_code(self):
        """Return the verification code."""
        configurator = self.hass.components.configurator
        if self.accountname in _CONFIGURING:
            return

        _CONFIGURING[self.accountname] = configurator.request_config(
            f"iCloud {self.accountname}",
            self.icloud_verification_callback,
            description=("Please enter the validation code:"),
            entity_picture="/static/images/config_icloud.png",
            submit_caption="Confirm",
            fields=[{"id": "code", "name": "code"}],
        )

    def keep_alive(self, now):
        """Keep the API alive."""
        if self.api is None:
            self.reset_account_icloud()

        if self.api is None:
            return

        if self.api.requires_2fa:
            try:
                if self._trusted_device is None:
                    self.icloud_need_trusted_device()
                    return

                if self._verification_code is None:
                    self.icloud_need_verification_code()
                    return

                self.api.authenticate()
                if self.api.requires_2fa:
                    raise Exception("Unknown failure")

                self._trusted_device = None
                self._verification_code = None
            except PyiCloudException as error:
                _LOGGER.error("Error setting up 2FA: %s", error)
        else:
            self.api.authenticate()

        currentminutes = dt_util.now().hour * 60 + dt_util.now().minute
        try:
            for devicename in self.devices:
                interval = self._intervals.get(devicename, 1)
                if (currentminutes % interval == 0) or (
                    interval > 10 and currentminutes % interval in [2, 4]
                ):
                    self.update_device(devicename)
        except ValueError:
            _LOGGER.debug("iCloud API returned an error")

    def determine_interval(self, devicename, latitude, longitude, battery):
        """Calculate new interval."""
        currentzone = run_callback_threadsafe(
            self.hass.loop, async_active_zone, self.hass, latitude, longitude
        ).result()

        if (
            currentzone is not None
            and currentzone == self._overridestates.get(devicename)
        ) or (currentzone is None and self._overridestates.get(devicename) == "away"):
            return

        zones = (
            self.hass.states.get(entity_id)
            for entity_id in sorted(self.hass.states.entity_ids("zone"))
        )

        distances = []
        for zone_state in zones:
            zone_state_lat = zone_state.attributes["latitude"]
            zone_state_long = zone_state.attributes["longitude"]
            zone_distance = distance(
                latitude, longitude, zone_state_lat, zone_state_long
            )
            distances.append(round(zone_distance / 1000, 1))

        if distances:
            mindistance = min(distances)
        else:
            mindistance = None

        self._overridestates[devicename] = None

        if currentzone is not None:
            self._intervals[devicename] = self._max_interval
            return

        if mindistance is None:
            return

        # Calculate out how long it would take for the device to drive to the
        # nearest zone at 120 km/h:
        interval = round(mindistance / 2, 0)

        # Never poll more than once per minute
        interval = max(interval, 1)

        if interval > 180:
            # Three hour drive?  This is far enough that they might be flying
            interval = 30

        if battery is not None and battery <= 33 and mindistance > 3:
            # Low battery - let's check half as often
            interval = interval * 2

        self._intervals[devicename] = interval

    def update_device(self, devicename):
        """Update the device_tracker entity."""
        # An entity will not be created by see() when track=false in
        # 'known_devices.yaml', but we need to see() it at least once
        entity = self.hass.states.get(ENTITY_ID_FORMAT.format(devicename))
        if entity is None and devicename in self.seen_devices:
            return
        attrs = {}