"""Config flow for Z-Wave JS integration."""
import asyncio
import logging
from typing import Any, Dict, Optional

import aiohttp
from async_timeout import timeout
import voluptuous as vol
from zwave_js_server.version import VersionInfo, get_server_version

from homeassistant import config_entries, core, exceptions
from homeassistant.const import CONF_URL
from homeassistant.helpers.aiohttp_client import async_get_clientsession

from .const import DOMAIN, NAME  # pylint:disable=unused-import

_LOGGER = logging.getLogger(__name__)

STEP_USER_DATA_SCHEMA = vol.Schema({CONF_URL: str})


async def validate_input(hass: core.HomeAssistant, user_input: dict) -> VersionInfo:
    """Validate if the user input allows us to connect."""
    ws_address = user_input[CONF_URL]

    if not ws_address.startswith(("ws://", "wss://")):
        raise InvalidInput("invalid_ws_url")

    async with timeout(10):
        try:
            return await get_server_version(ws_address, async_get_clientsession(hass))
        except (asyncio.TimeoutError, aiohttp.ClientError) as err:
            raise InvalidInput("cannot_connect") from err


class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for Z-Wave JS."""

    VERSION = 1
    CONNECTION_CLASS = config_entries.CONN_CLASS_LOCAL_PUSH

    async def async_step_user(
        self, user_input: Optional[Dict[str, Any]] = None
    ) -> Dict[str, Any]:
        """Handle the initial step."""
        if user_input is None:
            return self.async_show_form(
                step_id="user", data_schema=STEP_USER_DATA_SCHEMA
            )

        errors = {}

        assert self.hass  # typing

        try:
            version_info = await validate_input(self.hass, user_input)
        except InvalidInput as err:
            errors["base"] = err.error
        except Exception:  # pylint: disable=broad-except
            _LOGGER.exception("Unexpected exception")
            errors["base"] = "unknown"
        else:
            await self.async_set_unique_id(version_info.home_id)
            self._abort_if_unique_id_configured(user_input)
            return self.async_create_entry(title=NAME, data=user_input)

        return self.async_show_form(
            step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
        )


class InvalidInput(exceptions.HomeAssistantError):
    """Error to indicate input data is invalid."""

    def __init__(self, error: str) -> None:
        """Initialize error."""
        super().__init__()
        self.error = error