/*
 * Copyright (C) 2026 Fluxer Contributors
 *
 * This file is part of Fluxer.
 *
 * Fluxer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Fluxer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
 */

import {lookupGeoipByIp} from '@fluxer/geoip/src/GeoipLookup';
import {extractClientIp} from '@fluxer/ip_utils/src/ClientIp';

export interface GeoIpConfig {
	geoipDbPath: string;
	trustCfConnectingIp: boolean;
}

const DEFAULT_COUNTRY_CODE = 'US';

export async function getCountryCode(req: Request, config: GeoIpConfig): Promise<string> {
	if (!config.geoipDbPath) {
		return DEFAULT_COUNTRY_CODE;
	}

	const ip = extractClientIp(req, {trustCfConnectingIp: config.trustCfConnectingIp});
	if (!ip) {
		return DEFAULT_COUNTRY_CODE;
	}

	const result = await lookupGeoipByIp(ip, config.geoipDbPath);
	return result.countryCode ?? DEFAULT_COUNTRY_CODE;
}