"""Config flow to configure the SmartTub integration."""
from __future__ import annotations

from collections.abc import Mapping
from typing import Any

from smarttub import LoginFailed
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.const import CONF_EMAIL, CONF_PASSWORD
from homeassistant.data_entry_flow import FlowResult

from .const import DOMAIN
from .controller import SmartTubController

DATA_SCHEMA = vol.Schema(
    {vol.Required(CONF_EMAIL): str, vol.Required(CONF_PASSWORD): str}
)


class SmartTubConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """SmartTub configuration flow."""

    VERSION = 1

    def __init__(self) -> None:
        """Instantiate config flow."""
        super().__init__()
        self._reauth_input: Mapping[str, Any] | None = None
        self._reauth_entry: config_entries.ConfigEntry | None = None

    async def async_step_user(self, user_input=None):
        """Handle a flow initiated by the user."""
        errors = {}

        if user_input is not None:
            controller = SmartTubController(self.hass)
            try:
                account = await controller.login(
                    user_input[CONF_EMAIL], user_input[CONF_PASSWORD]
                )

            except LoginFailed:
                errors["base"] = "invalid_auth"
            else:
                await self.async_set_unique_id(account.id)

                if self._reauth_input is None:
                    self._abort_if_unique_id_configured()
                    return self.async_create_entry(
                        title=user_input[CONF_EMAIL], data=user_input
                    )

                # this is a reauth attempt
                if self._reauth_entry.unique_id != self.unique_id:
                    # there is a config entry matching this account,
                    # but it is not the one we were trying to reauth
                    return self.async_abort(reason="already_configured")
                self.hass.config_entries.async_update_entry(
                    self._reauth_entry, data=user_input
                )
                await self.hass.config_entries.async_reload(self._reauth_entry.entry_id)
                return self.async_abort(reason="reauth_successful")

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

    async def async_step_reauth(self, entry_data: Mapping[str, Any]) -> FlowResult:
        """Get new credentials if the current ones don't work anymore."""
        self._reauth_input = entry_data
        self._reauth_entry = self.hass.config_entries.async_get_entry(
            self.context["entry_id"]
        )
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(self, user_input=None):
        """Dialog that informs the user that reauth is required."""
        if user_input is None:
            # same as DATA_SCHEMA but with default email
            data_schema = vol.Schema(
                {
                    vol.Required(
                        CONF_EMAIL, default=self._reauth_input.get(CONF_EMAIL)
                    ): str,
                    vol.Required(CONF_PASSWORD): str,
                }
            )
            return self.async_show_form(
                step_id="reauth_confirm",
                data_schema=data_schema,
            )
        return await self.async_step_user(user_input)