"""Config Flow for Flick Electric integration."""

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

from aiohttp import ClientResponseError
from pyflick import FlickAPI
from pyflick.authentication import AbstractFlickAuth, SimpleFlickAuth
from pyflick.const import DEFAULT_CLIENT_ID, DEFAULT_CLIENT_SECRET
from pyflick.types import APIException, AuthException, CustomerAccount
import voluptuous as vol

from homeassistant.config_entries import SOURCE_REAUTH, ConfigFlow, ConfigFlowResult
from homeassistant.const import (
    CONF_CLIENT_ID,
    CONF_CLIENT_SECRET,
    CONF_PASSWORD,
    CONF_USERNAME,
)
from homeassistant.exceptions import HomeAssistantError
from homeassistant.helpers import aiohttp_client
from homeassistant.helpers.selector import (
    SelectOptionDict,
    SelectSelector,
    SelectSelectorConfig,
    SelectSelectorMode,
)

from .const import CONF_ACCOUNT_ID, CONF_SUPPLY_NODE_REF, DOMAIN

_LOGGER = logging.getLogger(__name__)

LOGIN_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_USERNAME): str,
        vol.Required(CONF_PASSWORD): str,
        vol.Optional(CONF_CLIENT_ID): str,
        vol.Optional(CONF_CLIENT_SECRET): str,
    }
)


class FlickConfigFlow(ConfigFlow, domain=DOMAIN):
    """Flick config flow."""

    VERSION = 2
    auth: AbstractFlickAuth
    accounts: list[CustomerAccount]
    data: dict[str, Any]

    async def _validate_auth(self, user_input: Mapping[str, Any]) -> bool:
        self.auth = SimpleFlickAuth(
            username=user_input[CONF_USERNAME],
            password=user_input[CONF_PASSWORD],
            websession=aiohttp_client.async_get_clientsession(self.hass),
            client_id=user_input.get(CONF_CLIENT_ID, DEFAULT_CLIENT_ID),
            client_secret=user_input.get(CONF_CLIENT_SECRET, DEFAULT_CLIENT_SECRET),
        )

        try:
            async with asyncio.timeout(60):
                token = await self.auth.async_get_access_token()
        except (TimeoutError, ClientResponseError) as err:
            raise CannotConnect from err
        except AuthException as err:
            raise InvalidAuth from err

        return token is not None

    async def async_step_select_account(
        self, user_input: Mapping[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Ask user to select account."""

        errors = {}
        if user_input is not None and CONF_ACCOUNT_ID in user_input:
            self.data[CONF_ACCOUNT_ID] = user_input[CONF_ACCOUNT_ID]
            self.data[CONF_SUPPLY_NODE_REF] = self._get_supply_node_ref(
                user_input[CONF_ACCOUNT_ID]
            )
            try:
                # Ensure supply node is active
                await FlickAPI(self.auth).getPricing(self.data[CONF_SUPPLY_NODE_REF])
            except (APIException, ClientResponseError):
                errors["base"] = "cannot_connect"
            except AuthException:
                # We should never get here as we have a valid token
                return self.async_abort(reason="no_permissions")
            else:
                # Supply node is active
                return await self._async_create_entry()

        try:
            self.accounts = await FlickAPI(self.auth).getCustomerAccounts()
        except (APIException, ClientResponseError):
            errors["base"] = "cannot_connect"

        active_accounts = [a for a in self.accounts if a["status"] == "active"]

        if len(active_accounts) == 0:
            return self.async_abort(reason="no_accounts")

        if len(active_accounts) == 1:
            self.data[CONF_ACCOUNT_ID] = active_accounts[0]["id"]
            self.data[CONF_SUPPLY_NODE_REF] = self._get_supply_node_ref(
                active_accounts[0]["id"]
            )

            return await self._async_create_entry()

        return self.async_show_form(
            step_id="select_account",
            data_schema=vol.Schema(
                {
                    vol.Required(CONF_ACCOUNT_ID): SelectSelector(
                        SelectSelectorConfig(
                            options=[
                                SelectOptionDict(
                                    value=account["id"], label=account["address"]
                                )
                                for account in active_accounts
                            ],
                            mode=SelectSelectorMode.LIST,
                        )
                    )
                }
            ),
            errors=errors,
        )

    async def async_step_user(
        self, user_input: Mapping[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle gathering login info."""
        errors = {}
        if user_input is not None:
            try:
                await self._validate_auth(user_input)
            except CannotConnect:
                errors["base"] = "cannot_connect"
            except InvalidAuth:
                errors["base"] = "invalid_auth"
            except Exception:
                _LOGGER.exception("Unexpected exception")
                errors["base"] = "unknown"
            else:
                self.data = dict(user_input)
                return await self.async_step_select_account(user_input)

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

    async def async_step_reauth(
        self, user_input: Mapping[str, Any]
    ) -> ConfigFlowResult:
        """Handle re-authentication."""

        self.data = {**user_input}

        return await self.async_step_user(user_input)

    async def _async_create_entry(self) -> ConfigFlowResult:
        """Create an entry for the flow."""

        await self.async_set_unique_id(self.data[CONF_ACCOUNT_ID])

        account = self._get_account(self.data[CONF_ACCOUNT_ID])

        if self.source == SOURCE_REAUTH:
            # Migration completed
            if self._get_reauth_entry().version == 1:
                self.hass.config_entries.async_update_entry(
                    self._get_reauth_entry(),
                    unique_id=self.unique_id,
                    data=self.data,
                    version=self.VERSION,
                )

            return self.async_update_reload_and_abort(
                self._get_reauth_entry(),
                unique_id=self.unique_id,
                title=account["address"],
                data=self.data,
            )

        self._abort_if_unique_id_configured()

        return self.async_create_entry(
            title=account["address"],
            data=self.data,
        )

    def _get_account(self, account_id: str) -> CustomerAccount:
        """Get the account for the account ID."""
        return next(a for a in self.accounts if a["id"] == account_id)

    def _get_supply_node_ref(self, account_id: str) -> str:
        """Get the supply node ref for the account."""
        return self._get_account(account_id)["main_consumer"][CONF_SUPPLY_NODE_REF]


class CannotConnect(HomeAssistantError):
    """Error to indicate we cannot connect."""


class InvalidAuth(HomeAssistantError):
    """Error to indicate there is invalid auth."""