"""Config flow for La Marzocco integration."""

from collections.abc import Mapping
import logging
from typing import Any

from lmcloud import LMCloud as LaMarzoccoClient
from lmcloud.exceptions import AuthFail, RequestNotSuccessful
import voluptuous as vol

from homeassistant.components.bluetooth import BluetoothServiceInfo
from homeassistant.config_entries import (
    ConfigEntry,
    ConfigFlow,
    ConfigFlowResult,
    OptionsFlow,
    OptionsFlowWithConfigEntry,
)
from homeassistant.const import (
    CONF_HOST,
    CONF_MAC,
    CONF_NAME,
    CONF_PASSWORD,
    CONF_USERNAME,
)
from homeassistant.core import callback
from homeassistant.helpers import config_validation as cv
from homeassistant.helpers.selector import (
    SelectOptionDict,
    SelectSelector,
    SelectSelectorConfig,
    SelectSelectorMode,
)

from .const import CONF_MACHINE, CONF_USE_BLUETOOTH, DOMAIN

_LOGGER = logging.getLogger(__name__)


class LmConfigFlow(ConfigFlow, domain=DOMAIN):
    """Handle a config flow for La Marzocco."""

    def __init__(self) -> None:
        """Initialize the config flow."""

        self.reauth_entry: ConfigEntry | None = None
        self._config: dict[str, Any] = {}
        self._machines: list[tuple[str, str]] = []
        self._discovered: dict[str, str] = {}

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle the initial step."""

        errors = {}

        if user_input:
            data: dict[str, Any] = {}
            if self.reauth_entry:
                data = dict(self.reauth_entry.data)
            data = {
                **data,
                **user_input,
                **self._discovered,
            }

            lm = LaMarzoccoClient()
            try:
                self._machines = await lm.get_all_machines(data)
            except AuthFail:
                _LOGGER.debug("Server rejected login credentials")
                errors["base"] = "invalid_auth"
            except RequestNotSuccessful as exc:
                _LOGGER.error("Error connecting to server: %s", exc)
                errors["base"] = "cannot_connect"
            else:
                if not self._machines:
                    errors["base"] = "no_machines"

            if not errors:
                if self.reauth_entry:
                    self.hass.config_entries.async_update_entry(
                        self.reauth_entry, data=data
                    )
                    await self.hass.config_entries.async_reload(
                        self.reauth_entry.entry_id
                    )
                    return self.async_abort(reason="reauth_successful")
                if self._discovered:
                    serials = [machine[0] for machine in self._machines]
                    if self._discovered[CONF_MACHINE] not in serials:
                        errors["base"] = "machine_not_found"
                    else:
                        self._config = data
                        return self.async_show_form(
                            step_id="machine_selection",
                            data_schema=vol.Schema(
                                {vol.Optional(CONF_HOST): cv.string}
                            ),
                        )

            if not errors:
                self._config = data
                return await self.async_step_machine_selection()

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

    async def async_step_machine_selection(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Let user select machine to connect to."""
        errors: dict[str, str] = {}
        if user_input:
            if not self._discovered:
                serial_number = user_input[CONF_MACHINE]
                await self.async_set_unique_id(serial_number)
                self._abort_if_unique_id_configured()
            else:
                serial_number = self._discovered[CONF_MACHINE]

            # validate local connection if host is provided
            if user_input.get(CONF_HOST):
                lm = LaMarzoccoClient()
                if not await lm.check_local_connection(
                    credentials=self._config,
                    host=user_input[CONF_HOST],
                    serial=serial_number,
                ):
                    errors[CONF_HOST] = "cannot_connect"

            if not errors:
                return self.async_create_entry(
                    title=serial_number,
                    data=self._config | user_input,
                )

        machine_options = [
            SelectOptionDict(
                value=serial_number,
                label=f"{model_name} ({serial_number})",
            )
            for serial_number, model_name in self._machines
        ]

        machine_selection_schema = vol.Schema(
            {
                vol.Required(
                    CONF_MACHINE, default=machine_options[0]["value"]
                ): SelectSelector(
                    SelectSelectorConfig(
                        options=machine_options,
                        mode=SelectSelectorMode.DROPDOWN,
                    )
                ),
                vol.Optional(CONF_HOST): cv.string,
            }
        )

        return self.async_show_form(
            step_id="machine_selection",
            data_schema=machine_selection_schema,
            errors=errors,
        )

    async def async_step_bluetooth(
        self, discovery_info: BluetoothServiceInfo
    ) -> ConfigFlowResult:
        """Handle a flow initialized by discovery over Bluetooth."""
        address = discovery_info.address
        name = discovery_info.name

        _LOGGER.debug(
            "Discovered La Marzocco machine %s through Bluetooth at address %s",
            name,
            address,
        )

        self._discovered[CONF_NAME] = name
        self._discovered[CONF_MAC] = address

        serial = name.split("_")[1]
        self._discovered[CONF_MACHINE] = serial

        await self.async_set_unique_id(serial)
        self._abort_if_unique_id_configured()

        return await self.async_step_user()

    async def async_step_reauth(
        self, entry_data: Mapping[str, Any]
    ) -> ConfigFlowResult:
        """Perform reauth upon an API authentication error."""
        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: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Dialog that informs the user that reauth is required."""
        if not user_input:
            return self.async_show_form(
                step_id="reauth_confirm",
                data_schema=vol.Schema(
                    {
                        vol.Required(CONF_PASSWORD): str,
                    }
                ),
            )

        return await self.async_step_user(user_input)

    @staticmethod
    @callback
    def async_get_options_flow(
        config_entry: ConfigEntry,
    ) -> OptionsFlow:
        """Create the options flow."""
        return LmOptionsFlowHandler(config_entry)


class LmOptionsFlowHandler(OptionsFlowWithConfigEntry):
    """Handles options flow for the component."""

    async def async_step_init(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Manage the options for the custom component."""
        if user_input:
            return self.async_create_entry(title="", data=user_input)

        options_schema = vol.Schema(
            {
                vol.Optional(
                    CONF_USE_BLUETOOTH,
                    default=self.options.get(CONF_USE_BLUETOOTH, True),
                ): cv.boolean,
            }
        )

        return self.async_show_form(
            step_id="init",
            data_schema=options_schema,
        )