"""Config flow for AdGuard Control Hub integration."""
from __future__ import annotations

import logging
from typing import Any

import voluptuous as vol
from homeassistant import config_entries
from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_PORT, CONF_USERNAME
from homeassistant.core import HomeAssistant
from homeassistant.data_entry_flow import FlowResult
from homeassistant.exceptions import HomeAssistantError
from homeassistant.helpers.aiohttp_client import async_get_clientsession

from .api import AdGuardHomeAPI, AdGuardHomeApiError, AdGuardHomeAuthError, AdGuardHomeConnectionError
from .const import CONF_SSL, CONF_VERIFY_SSL, DEFAULT_NAME, DEFAULT_PORT, DEFAULT_SSL, DEFAULT_VERIFY_SSL, DOMAIN

_LOGGER = logging.getLogger(__name__)

STEP_USER_DATA_SCHEMA = vol.Schema(
    {
        vol.Required(CONF_HOST): str,
        vol.Optional(CONF_PORT, default=DEFAULT_PORT): int,
        vol.Optional(CONF_USERNAME): str,
        vol.Optional(CONF_PASSWORD): str,
        vol.Optional(CONF_SSL, default=DEFAULT_SSL): bool,
        vol.Optional(CONF_VERIFY_SSL, default=DEFAULT_VERIFY_SSL): bool,
    }
)


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

    api = AdGuardHomeAPI(
        session,
        data[CONF_HOST],
        data[CONF_PORT],
        data.get(CONF_USERNAME),
        data.get(CONF_PASSWORD),
        data.get(CONF_SSL, DEFAULT_SSL),
        data.get(CONF_VERIFY_SSL, DEFAULT_VERIFY_SSL),
    )

    try:
        status = await api.get_status()
        return {"title": f"AdGuard Home ({data[CONF_HOST]})", "version": status.get("version", "Unknown")}
    except AdGuardHomeConnectionError as err:
        raise CannotConnect from err
    except AdGuardHomeAuthError as err:
        raise InvalidAuth from err
    except AdGuardHomeApiError as err:
        raise CannotConnect from err


class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for AdGuard Control Hub."""

    VERSION = 1

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

        errors = {}

        try:
            info = await validate_input(self.hass, user_input)
        except CannotConnect:
            errors["base"] = "cannot_connect"
        except InvalidAuth:
            errors["base"] = "invalid_auth"
        except Exception:  # pylint: disable=broad-except
            _LOGGER.exception("Unexpected exception")
            errors["base"] = "unknown"
        else:
            # Create unique ID from host and port
            unique_id = f"{user_input[CONF_HOST]}:{user_input[CONF_PORT]}"
            await self.async_set_unique_id(unique_id)
            self._abort_if_unique_id_configured()

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

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


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


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