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

from collections.abc import Mapping
from dataclasses import dataclass, field
from typing import Any

from aionotion.errors import InvalidCredentialsError, NotionError
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
from homeassistant.core import HomeAssistant
from homeassistant.data_entry_flow import FlowResult

from .const import CONF_REFRESH_TOKEN, CONF_USER_UUID, DOMAIN, LOGGER
from .util import async_get_client_with_credentials

AUTH_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_USERNAME): str,
        vol.Required(CONF_PASSWORD): str,
    }
)
REAUTH_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_PASSWORD): str,
    }
)


@dataclass(frozen=True, kw_only=True)
class CredentialsValidationResult:
    """Define a validation result."""

    user_uuid: str | None = None
    refresh_token: str | None = None
    errors: dict[str, Any] = field(default_factory=dict)


async def async_validate_credentials(
    hass: HomeAssistant, username: str, password: str
) -> CredentialsValidationResult:
    """Validate a Notion username and password."""
    errors = {}

    try:
        client = await async_get_client_with_credentials(hass, username, password)
    except InvalidCredentialsError:
        errors["base"] = "invalid_auth"
    except NotionError as err:
        LOGGER.error("Unknown Notion error while validation credentials: %s", err)
        errors["base"] = "unknown"
    except Exception as err:  # pylint: disable=broad-except
        LOGGER.exception("Unknown error while validation credentials: %s", err)
        errors["base"] = "unknown"

    if errors:
        return CredentialsValidationResult(errors=errors)

    return CredentialsValidationResult(
        user_uuid=client.user_uuid, refresh_token=client.refresh_token
    )


class NotionFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a Notion config flow."""

    VERSION = 1

    def __init__(self) -> None:
        """Initialize."""
        self._reauth_entry: ConfigEntry | None = None

    async def async_step_reauth(self, entry_data: Mapping[str, Any]) -> FlowResult:
        """Handle configuration by re-auth."""
        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
    ) -> FlowResult:
        """Handle re-auth completion."""
        assert self._reauth_entry

        if not user_input:
            return self.async_show_form(
                step_id="reauth_confirm",
                data_schema=REAUTH_SCHEMA,
                description_placeholders={
                    CONF_USERNAME: self._reauth_entry.data[CONF_USERNAME]
                },
            )

        credentials_validation_result = await async_validate_credentials(
            self.hass, self._reauth_entry.data[CONF_USERNAME], user_input[CONF_PASSWORD]
        )

        if credentials_validation_result.errors:
            return self.async_show_form(
                step_id="reauth_confirm",
                data_schema=REAUTH_SCHEMA,
                errors=credentials_validation_result.errors,
                description_placeholders={
                    CONF_USERNAME: self._reauth_entry.data[CONF_USERNAME]
                },
            )

        self.hass.config_entries.async_update_entry(
            self._reauth_entry,
            data=self._reauth_entry.data
            | {CONF_REFRESH_TOKEN: credentials_validation_result.refresh_token},
        )
        self.hass.async_create_task(
            self.hass.config_entries.async_reload(self._reauth_entry.entry_id)
        )
        return self.async_abort(reason="reauth_successful")

    async def async_step_user(
        self, user_input: dict[str, str] | None = None
    ) -> FlowResult:
        """Handle the start of the config flow."""
        if not user_input:
            return self.async_show_form(step_id="user", data_schema=AUTH_SCHEMA)

        await self.async_set_unique_id(user_input[CONF_USERNAME])
        self._abort_if_unique_id_configured()

        credentials_validation_result = await async_validate_credentials(
            self.hass, user_input[CONF_USERNAME], user_input[CONF_PASSWORD]
        )

        if credentials_validation_result.errors:
            return self.async_show_form(
                step_id="user",
                data_schema=AUTH_SCHEMA,
                errors=credentials_validation_result.errors,
            )

        return self.async_create_entry(
            title=user_input[CONF_USERNAME],
            data={
                CONF_USERNAME: user_input[CONF_USERNAME],
                CONF_USER_UUID: credentials_validation_result.user_uuid,
                CONF_REFRESH_TOKEN: credentials_validation_result.refresh_token,
            },
        )