"""Support for Broadlink devices."""
from contextlib import suppress
from functools import partial
import logging

import broadlink as blk
from broadlink.exceptions import (
    AuthenticationError,
    AuthorizationError,
    BroadlinkException,
    ConnectionClosedError,
    NetworkTimeoutError,
)

from homeassistant.config_entries import SOURCE_REAUTH
from homeassistant.const import CONF_HOST, CONF_MAC, CONF_NAME, CONF_TIMEOUT, CONF_TYPE
from homeassistant.exceptions import ConfigEntryNotReady
from homeassistant.helpers import device_registry as dr

from .const import DEFAULT_PORT, DOMAIN, DOMAINS_AND_TYPES
from .updater import get_update_manager

_LOGGER = logging.getLogger(__name__)


def get_domains(dev_type):
    """Return the domains available for a device type."""
    return {d for d, t in DOMAINS_AND_TYPES.items() if dev_type in t}


class BroadlinkDevice:
    """Manages a Broadlink device."""

    def __init__(self, hass, config):
        """Initialize the device."""
        self.hass = hass
        self.config = config
        self.api = None
        self.update_manager = None
        self.fw_version = None
        self.authorized = None
        self.reset_jobs = []

    @property
    def name(self):
        """Return the name of the device."""
        return self.config.title

    @property
    def unique_id(self):
        """Return the unique id of the device."""
        return self.config.unique_id

    @staticmethod
    async def async_update(hass, entry):
        """Update the device and related entities.

        Triggered when the device is renamed on the frontend.
        """
        device_registry = await dr.async_get_registry(hass)
        device_entry = device_registry.async_get_device({(DOMAIN, entry.unique_id)})
        device_registry.async_update_device(device_entry.id, name=entry.title)
        await hass.config_entries.async_reload(entry.entry_id)

    def _auth_fetch_firmware(self):
        """Auth and fetch firmware."""
        self.api.auth()
        with suppress(BroadlinkException, OSError):
            return self.api.get_fwversion()
        return None

    async def async_setup(self):
        """Set up the device and related entities."""
        config = self.config

        api = blk.gendevice(
            config.data[CONF_TYPE],
            (config.data[CONF_HOST], DEFAULT_PORT),
            bytes.fromhex(config.data[CONF_MAC]),
            name=config.title,
        )
        api.timeout = config.data[CONF_TIMEOUT]
        self.api = api

        try:
            self.fw_version = await self.hass.async_add_executor_job(
                self._auth_fetch_firmware
            )

        except AuthenticationError:
            await self._async_handle_auth_error()
            return False

        except (NetworkTimeoutError, OSError) as err:
            raise ConfigEntryNotReady from err

        except BroadlinkException as err:
            _LOGGER.error(
                "Failed to authenticate to the device at %s: %s", api.host[0], err
            )
            return False

        self.authorized = True

        update_manager = get_update_manager(self)
        coordinator = update_manager.coordinator
        await coordinator.async_config_entry_first_refresh()

        self.update_manager = update_manager
        self.hass.data[DOMAIN].devices[config.entry_id] = self
        self.reset_jobs.append(config.add_update_listener(self.async_update))

        # Forward entry setup to related domains.
        self.hass.config_entries.async_setup_platforms(
            config, get_domains(self.api.type)
        )

        return True

    async def async_unload(self):
        """Unload the device and related entities."""
        if self.update_manager is None:
            return True

        while self.reset_jobs:
            self.reset_jobs.pop()()

        return await self.hass.config_entries.async_unload_platforms(
            self.config, get_domains(self.api.type)
        )

    async def async_auth(self):
        """Authenticate to the device."""
        try:
            await self.hass.async_add_executor_job(self.api.auth)
        except (BroadlinkException, OSError) as err:
            _LOGGER.debug(
                "Failed to authenticate to the device at %s: %s", self.api.host[0], err
            )
            if isinstance(err, AuthenticationError):
                await self._async_handle_auth_error()
            return False
        return True

    async def async_request(self, function, *args, **kwargs):
        """Send a request to the device."""
        request = partial(function, *args, **kwargs)
        try:
            return await self.hass.async_add_executor_job(request)
        except (AuthorizationError, ConnectionClosedError):
            if not await self.async_auth():
                raise
            return await self.hass.async_add_executor_job(request)

    async def _async_handle_auth_error(self):
        """Handle an authentication error."""
        if self.authorized is False:
            return

        self.authorized = False

        _LOGGER.error(
            "%s (%s at %s) is locked. Click Configuration in the sidebar, "
            "click Integrations, click Configure on the device and follow "
            "the instructions to unlock it",
            self.name,
            self.api.model,
            self.api.host[0],
        )

        self.hass.async_create_task(
            self.hass.config_entries.flow.async_init(
                DOMAIN,
                context={"source": SOURCE_REAUTH},
                data={CONF_NAME: self.name, **self.config.data},
            )
        )