"""Config flow for Linky Tariff integration."""
from __future__ import annotations

import logging
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.core import callback
from homeassistant.helpers import device_registry as dr

from .const import (
    DOMAIN,
    CONF_IEEE,
    CONF_POLL_INTERVAL,
    DEFAULT_POLL_INTERVAL,
)

_LOGGER = logging.getLogger(__name__)

async def async_get_zha_devices(hass):
    """Get ZHA devices."""
    if not hasattr(hass.data.get("zha"), "core"):
        return []

    zha_gateway = hass.data["zha"].core.gateway
    if not zha_gateway:
        return []

    return [
        (str(device.ieee), f"{device.name} ({device.ieee})"
        for device in zha_gateway.devices.values()
    ]

class LinkyTariffConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for Linky Tariff."""

    VERSION = 1

    async def async_step_user(self, user_input=None):
        """Handle the initial step."""
        errors = {}
        devices = await async_get_zha_devices(self.hass)

        if not devices:
            return self.async_abort(reason="no_zha_devices")

        if user_input is not None:
            await self.async_set_unique_id(user_input[CONF_IEEE])
            self._abort_if_unique_id_configured()
            return self.async_create_entry(title="Linky Tariff", data=user_input)

        device_options = {
            ieee: name for ieee, name in devices
        }

        return self.async_show_form(
            step_id="user",
            data_schema=vol.Schema({
                vol.Required(CONF_IEEE): vol.In(device_options),
                vol.Optional(
                    CONF_POLL_INTERVAL,
                    default=DEFAULT_POLL_INTERVAL
                ): int,
            }),
            errors=errors,
        )

    @staticmethod
    @callback
    def async_get_options_flow(config_entry):
        """Get the options flow for this handler."""
        return LinkyTariffOptionsFlow(config_entry)

class LinkyTariffOptionsFlow(config_entries.OptionsFlow):
    """Handle options flow for Linky Tariff."""

    def __init__(self, config_entry):
        """Initialize options flow."""
        self.config_entry = config_entry

    async def async_step_init(self, user_input=None):
        """Manage the options."""
        if user_input is not None:
            return self.async_create_entry(title="", data=user_input)

        return self.async_show_form(
            step_id="init",
            data_schema=vol.Schema({
                vol.Optional(
                    CONF_POLL_INTERVAL,
                    default=self.config_entry.options.get(
                        CONF_POLL_INTERVAL, DEFAULT_POLL_INTERVAL
                    ),
                ): int,
            }),
        )