"""Config flow for the LiteJet lighting system."""
import logging
from typing import Any, Dict, Optional

import pylitejet
from serial import SerialException
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.const import CONF_PORT

from .const import DOMAIN

_LOGGER = logging.getLogger(__name__)


class LiteJetConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """LiteJet config flow."""

    async def async_step_user(
        self, user_input: Optional[Dict[str, Any]] = None
    ) -> Dict[str, Any]:
        """Create a LiteJet config entry based upon user input."""
        if self.hass.config_entries.async_entries(DOMAIN):
            return self.async_abort(reason="single_instance_allowed")

        errors = {}
        if user_input is not None:
            port = user_input[CONF_PORT]

            await self.async_set_unique_id(port)
            self._abort_if_unique_id_configured()

            try:
                system = pylitejet.LiteJet(port)
                system.close()
            except SerialException:
                errors[CONF_PORT] = "open_failed"
            else:
                return self.async_create_entry(
                    title=port,
                    data={CONF_PORT: port},
                )

        return self.async_show_form(
            step_id="user",
            data_schema=vol.Schema({vol.Required(CONF_PORT): str}),
            errors=errors,
        )

    async def async_step_import(self, import_data):
        """Import litejet config from configuration.yaml."""
        return self.async_create_entry(title=import_data[CONF_PORT], data=import_data)