"""Config flow for Discovergy integration."""

from __future__ import annotations

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

from pydiscovergy import Discovergy
from pydiscovergy.authentication import BasicAuth
import pydiscovergy.error as discovergyError
import voluptuous as vol

from homeassistant.config_entries import ConfigEntry, ConfigFlow, ConfigFlowResult
from homeassistant.const import CONF_EMAIL, CONF_PASSWORD
from homeassistant.helpers.httpx_client import get_async_client
from homeassistant.helpers.selector import (
    TextSelector,
    TextSelectorConfig,
    TextSelectorType,
)

from .const import DOMAIN

_LOGGER = logging.getLogger(__name__)


CONFIG_SCHEMA = vol.Schema(
    {
        vol.Required(
            CONF_EMAIL,
        ): TextSelector(
            TextSelectorConfig(
                type=TextSelectorType.EMAIL,
                autocomplete="email",
            )
        ),
        vol.Required(
            CONF_PASSWORD,
        ): TextSelector(
            TextSelectorConfig(
                type=TextSelectorType.PASSWORD,
                autocomplete="current-password",
            )
        ),
    }
)


class DiscovergyConfigFlow(ConfigFlow, domain=DOMAIN):
    """Handle a config flow for Discovergy."""

    VERSION = 1

    _existing_entry: ConfigEntry | None = None

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle the initial step."""
        if user_input is None:
            return self.async_show_form(
                step_id="user",
                data_schema=CONFIG_SCHEMA,
            )

        return await self._validate_and_save(user_input)

    async def async_step_reauth(
        self, entry_data: Mapping[str, Any]
    ) -> ConfigFlowResult:
        """Handle the initial step."""
        self._existing_entry = await self.async_set_unique_id(self.context["unique_id"])
        return await self._validate_and_save(entry_data, step_id="reauth")

    async def _validate_and_save(
        self, user_input: Mapping[str, Any] | None = None, step_id: str = "user"
    ) -> ConfigFlowResult:
        """Validate user input and create config entry."""
        errors = {}

        if user_input:
            try:
                await Discovergy(
                    email=user_input[CONF_EMAIL],
                    password=user_input[CONF_PASSWORD],
                    httpx_client=get_async_client(self.hass),
                    authentication=BasicAuth(),
                ).meters()
            except (discovergyError.HTTPError, discovergyError.DiscovergyClientError):
                errors["base"] = "cannot_connect"
            except discovergyError.InvalidLogin:
                errors["base"] = "invalid_auth"
            except Exception:
                _LOGGER.exception("Unexpected error occurred while getting meters")
                errors["base"] = "unknown"
            else:
                if self._existing_entry:
                    return self.async_update_reload_and_abort(
                        entry=self._existing_entry,
                        data={
                            CONF_EMAIL: user_input[CONF_EMAIL],
                            CONF_PASSWORD: user_input[CONF_PASSWORD],
                        },
                    )

                # set unique id to title which is the account email
                await self.async_set_unique_id(user_input[CONF_EMAIL].lower())
                self._abort_if_unique_id_configured()

                return self.async_create_entry(
                    title=user_input[CONF_EMAIL], data=user_input
                )

        return self.async_show_form(
            step_id=step_id,
            data_schema=self.add_suggested_values_to_schema(
                CONFIG_SCHEMA,
                self._existing_entry.data if self._existing_entry else user_input,
            ),
            errors=errors,
        )