"""Config flow for the Daikin platform."""
import asyncio
import logging
from uuid import uuid4

from aiohttp import ClientError, web_exceptions
from async_timeout import timeout
from pydaikin.daikin_base import Appliance
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.const import CONF_HOST, CONF_PASSWORD

from .const import CONF_KEY, CONF_UUID, KEY_IP, KEY_MAC, TIMEOUT

_LOGGER = logging.getLogger(__name__)

DATA_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_HOST): str,
        vol.Optional(CONF_KEY): str,
        vol.Optional(CONF_PASSWORD): str,
    }
)


@config_entries.HANDLERS.register("daikin")
class FlowHandler(config_entries.ConfigFlow):
    """Handle a config flow."""

    VERSION = 1
    CONNECTION_CLASS = config_entries.CONN_CLASS_LOCAL_POLL

    def _create_entry(self, host, mac, key=None, uuid=None, password=None):
        """Register new entry."""
        # Check if mac already is registered
        for entry in self._async_current_entries():
            if entry.data[KEY_MAC] == mac:
                return self.async_abort(reason="already_configured")

        return self.async_create_entry(
            title=host,
            data={
                CONF_HOST: host,
                KEY_MAC: mac,
                CONF_KEY: key,
                CONF_UUID: uuid,
                CONF_PASSWORD: password,
            },
        )

    async def _create_device(self, host, key=None, password=None):
        """Create device."""
        # BRP07Cxx devices needs uuid together with key
        if key:
            uuid = str(uuid4())
        else:
            uuid = None
            key = None

        if not password:
            password = None

        try:
            with timeout(TIMEOUT):
                device = await Appliance.factory(
                    host,
                    self.hass.helpers.aiohttp_client.async_get_clientsession(),
                    key=key,
                    uuid=uuid,
                    password=password,
                )
        except asyncio.TimeoutError:
            return self.async_show_form(
                step_id="user",
                data_schema=DATA_SCHEMA,
                errors={"base": "device_timeout"},
            )
        except web_exceptions.HTTPForbidden:
            return self.async_show_form(
                step_id="user", data_schema=DATA_SCHEMA, errors={"base": "forbidden"},
            )
        except ClientError:
            _LOGGER.exception("ClientError")
            return self.async_show_form(
                step_id="user", data_schema=DATA_SCHEMA, errors={"base": "device_fail"},
            )
        except Exception:  # pylint: disable=broad-except
            _LOGGER.exception("Unexpected error creating device")
            return self.async_show_form(
                step_id="user", data_schema=DATA_SCHEMA, errors={"base": "device_fail"},
            )

        mac = device.mac
        return self._create_entry(host, mac, key, uuid, password)

    async def async_step_user(self, user_input=None):
        """User initiated config flow."""
        if user_input is None:
            return self.async_show_form(step_id="user", data_schema=DATA_SCHEMA,)
        return await self._create_device(
            user_input[CONF_HOST],
            user_input.get(CONF_KEY),
            user_input.get(CONF_PASSWORD),
        )

    async def async_step_import(self, user_input):
        """Import a config entry."""
        host = user_input.get(CONF_HOST)
        if not host:
            return await self.async_step_user()
        return await self._create_device(host)

    async def async_step_discovery(self, user_input):
        """Initialize step from discovery."""
        _LOGGER.info("Discovered device: %s", user_input)
        return self._create_entry(user_input[KEY_IP], user_input[KEY_MAC])