"""Config flow for Cloudflare integration."""

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

import pycfdns
import voluptuous as vol

from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
from homeassistant.const import CONF_API_TOKEN, CONF_ZONE
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import HomeAssistantError
from homeassistant.helpers import config_validation as cv
from homeassistant.helpers.aiohttp_client import async_get_clientsession

from .const import CONF_RECORDS, DOMAIN
from .helpers import get_zone_id

_LOGGER = logging.getLogger(__name__)

DATA_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_API_TOKEN): str,
    }
)


def _zone_schema(zones: list[pycfdns.ZoneModel] | None = None) -> vol.Schema:
    """Zone selection schema."""
    zones_list = []

    if zones is not None:
        zones_list = [zones["name"] for zones in zones]

    return vol.Schema({vol.Required(CONF_ZONE): vol.In(zones_list)})


def _records_schema(records: list[pycfdns.RecordModel] | None = None) -> vol.Schema:
    """Zone records selection schema."""
    records_dict = {}

    if records:
        records_dict = {name["name"]: name["name"] for name in records}

    return vol.Schema({vol.Required(CONF_RECORDS): cv.multi_select(records_dict)})


async def _validate_input(
    hass: HomeAssistant,
    data: dict[str, Any],
) -> dict[str, Any]:
    """Validate the user input allows us to connect.

    Data has the keys from DATA_SCHEMA with values provided by the user.
    """
    zone = data.get(CONF_ZONE)
    records: list[pycfdns.RecordModel] = []

    client = pycfdns.Client(
        api_token=data[CONF_API_TOKEN],
        client_session=async_get_clientsession(hass),
    )

    zones = await client.list_zones()
    if zone and (zone_id := get_zone_id(zone, zones)) is not None:
        records = await client.list_dns_records(zone_id=zone_id, type="A")

    return {"zones": zones, "records": records}


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

    VERSION = 1

    def __init__(self) -> None:
        """Initialize the Cloudflare config flow."""
        self.cloudflare_config: dict[str, Any] = {}
        self.zones: list[pycfdns.ZoneModel] | None = None
        self.records: list[pycfdns.RecordModel] | None = None

    async def async_step_reauth(
        self, entry_data: Mapping[str, Any]
    ) -> ConfigFlowResult:
        """Handle initiation of re-authentication with Cloudflare."""
        return await self.async_step_reauth_confirm()

    async def async_step_reauth_confirm(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle re-authentication with Cloudflare."""
        errors: dict[str, str] = {}

        if user_input is not None:
            _, errors = await self._async_validate_or_error(user_input)

            if not errors:
                reauth_entry = self._get_reauth_entry()
                return self.async_update_reload_and_abort(
                    reauth_entry,
                    data={
                        **reauth_entry.data,
                        CONF_API_TOKEN: user_input[CONF_API_TOKEN],
                    },
                )

        return self.async_show_form(
            step_id="reauth_confirm",
            data_schema=DATA_SCHEMA,
            errors=errors,
        )

    @override
    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle a flow initiated by the user."""
        errors: dict[str, str] = {}

        if user_input is not None:
            info, errors = await self._async_validate_or_error(user_input)

            if not errors:
                self.cloudflare_config.update(user_input)
                self.zones = info["zones"]
                return await self.async_step_zone()

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

    async def async_step_zone(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle the picking the zone."""
        errors: dict[str, str] = {}

        if user_input is not None:
            self.cloudflare_config.update(user_input)
            info, errors = await self._async_validate_or_error(self.cloudflare_config)

            if not errors:
                await self.async_set_unique_id(user_input[CONF_ZONE])
                self.records = info["records"]

                return await self.async_step_records()

        return self.async_show_form(
            step_id="zone",
            data_schema=_zone_schema(self.zones),
            errors=errors,
        )

    async def async_step_records(
        self, user_input: dict[str, Any] | None = None
    ) -> ConfigFlowResult:
        """Handle the picking the zone records."""

        if user_input is not None:
            self.cloudflare_config.update(user_input)
            title = self.cloudflare_config[CONF_ZONE]
            return self.async_create_entry(title=title, data=self.cloudflare_config)

        return self.async_show_form(
            step_id="records",
            data_schema=_records_schema(self.records),
        )

    async def _async_validate_or_error(
        self, config: dict[str, Any]
    ) -> tuple[dict[str, list[Any]], dict[str, str]]:
        errors: dict[str, str] = {}
        info = {}

        try:
            info = await _validate_input(self.hass, config)
        except pycfdns.ComunicationException:
            errors["base"] = "cannot_connect"
        except pycfdns.AuthenticationException:
            errors["base"] = "invalid_auth"
        except Exception:
            _LOGGER.exception("Unexpected exception")
            errors["base"] = "unknown"

        return info, errors


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


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