"""Config flow to configure the Hilo component."""

from __future__ import annotations

import logging
from typing import Any

from awesomeversion import AwesomeVersion
from homeassistant import config_entries
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import CONF_SCAN_INTERVAL, __version__ as HAVERSION
from homeassistant.core import callback
from homeassistant.data_entry_flow import FlowResult
from homeassistant.helpers import config_validation as cv, selector
from homeassistant.helpers.config_entry_oauth2_flow import AbstractOAuth2FlowHandler
import jwt
import voluptuous as vol

from .const import (
    CONF_APPRECIATION_PHASE,
    CONF_CHALLENGE_LOCK,
    CONF_GENERATE_ENERGY_METERS,
    CONF_HQ_PLAN_NAME,
    CONF_LOG_TRACES,
    CONF_PRE_COLD_PHASE,
    CONF_TARIFF,
    CONF_TRACK_UNKNOWN_SOURCES,
    CONF_UNTARIFICATED_DEVICES,
    DEFAULT_APPRECIATION_PHASE,
    DEFAULT_CHALLENGE_LOCK,
    DEFAULT_GENERATE_ENERGY_METERS,
    DEFAULT_HQ_PLAN_NAME,
    DEFAULT_LOG_TRACES,
    DEFAULT_PRE_COLD_PHASE,
    DEFAULT_TRACK_UNKNOWN_SOURCES,
    DEFAULT_UNTARIFICATED_DEVICES,
    DOMAIN,
    LOG,
    MIN_SCAN_INTERVAL,
)
from .oauth2 import AuthCodeWithPKCEImplementation

STEP_OPTION_SCHEMA = vol.Schema(
    {
        vol.Optional(
            CONF_GENERATE_ENERGY_METERS, default=DEFAULT_GENERATE_ENERGY_METERS
        ): cv.boolean,
        vol.Optional(
            CONF_UNTARIFICATED_DEVICES,
            default=DEFAULT_UNTARIFICATED_DEVICES,
        ): cv.boolean,
        vol.Optional(
            CONF_LOG_TRACES,
            default=DEFAULT_LOG_TRACES,
        ): cv.boolean,
        vol.Optional(
            CONF_CHALLENGE_LOCK,
            default=DEFAULT_CHALLENGE_LOCK,
        ): cv.boolean,
        vol.Optional(
            CONF_TRACK_UNKNOWN_SOURCES,
            default=DEFAULT_TRACK_UNKNOWN_SOURCES,
        ): cv.boolean,
        vol.Optional(
            CONF_HQ_PLAN_NAME, default=DEFAULT_HQ_PLAN_NAME
        ): selector.SelectSelector(
            selector.SelectSelectorConfig(options=list(CONF_TARIFF.keys()), mode="list")
        ),
        vol.Optional(
            CONF_APPRECIATION_PHASE,
            default=DEFAULT_APPRECIATION_PHASE,
        ): cv.positive_int,
        vol.Optional(
            CONF_PRE_COLD_PHASE,
            default=DEFAULT_PRE_COLD_PHASE,
        ): cv.positive_int,
        vol.Optional(CONF_SCAN_INTERVAL): (
            vol.All(cv.positive_int, vol.Range(min=MIN_SCAN_INTERVAL))
        ),
    }
)


class HiloFlowHandler(AbstractOAuth2FlowHandler, domain=DOMAIN):
    """Handle a Hilo config flow."""

    DOMAIN = DOMAIN
    VERSION = 2

    _reauth_entry: ConfigEntry | None = None

    async def async_step_user(self, user_input=None) -> FlowResult:
        """Handle a flow initialized by the user."""
        await self.async_set_unique_id(DOMAIN)

        if self._async_current_entries():
            return self.async_abort(reason="single_instance_allowed")

        self.async_register_implementation(
            self.hass,
            AuthCodeWithPKCEImplementation(self.hass),
        )

        return await super().async_step_user(user_input)

    @property
    def logger(self) -> logging.Logger:
        """Return logger."""
        return LOG

    @staticmethod
    @callback
    def async_get_options_flow(
        config_entry: ConfigEntry,
    ) -> HiloOptionsFlowHandler:
        """Define the config flow to handle options."""
        return HiloOptionsFlowHandler(config_entry)

    async def async_step_reauth(self, user_input=None) -> FlowResult:
        """Perform reauth upon an API authentication error."""
        LOG.debug("async_step_reauth")
        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) -> FlowResult:
        """Dialog that informs the user that reauth is required."""
        if user_input is None:
            return self.async_show_form(
                step_id="reauth_confirm",
                data_schema=vol.Schema({}),
            )
        user_input["implementation"] = DOMAIN
        return await super().async_step_user(user_input)

    async def async_oauth_create_entry(self, data: dict) -> FlowResult:
        """Create an oauth config entry or update existing entry for reauth."""
        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")

        LOG.debug("Creating entry: %s", data)

        token = data["token"]["access_token"]
        decoded_token = jwt.decode(token, options={"verify_signature": False})
        email = decoded_token["email"]

        return self.async_create_entry(title=email, data=data)


class HiloOptionsFlowHandler(config_entries.OptionsFlow):
    """Handle a Hilo options flow."""

    def __init__(self, config_entry: ConfigEntry) -> None:
        """Initialize."""
        if AwesomeVersion(HAVERSION) < "2024.11.99":
            self.config_entry = config_entry
        else:
            self._config_entry = config_entry

    async def async_step_init(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """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=self.add_suggested_values_to_schema(
                STEP_OPTION_SCHEMA, self.config_entry.options
            ),
        )