/*!
 * This file is part of Share₂Fedi
 * https://github.com/kytta/share2fedi
 *
 * SPDX-FileCopyrightText: © 2023 Nikita Karamov <me@kytta.dev>
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import { normalizeURL } from "@lib/url";

interface NodeInfoList {
	links: {
		rel: string;
		href: string;
	}[];
}

interface NodeInfo {
	software: {
		name: string;
		version: string;
		[key: string]: unknown;
	};
	[key: string]: unknown;
}

export const getSoftwareName = async (
	domain: string,
): Promise<string | undefined> => {
	const nodeInfoListUrl = new URL(
		"/.well-known/nodeinfo",
		normalizeURL(domain),
	);

	let nodeInfoList: NodeInfoList;
	try {
		const nodeInfoListResponse = await fetch(nodeInfoListUrl);
		nodeInfoList = await nodeInfoListResponse.json();
	} catch (error) {
		console.error("Could not fetch '.well-known/nodeinfo':", error);
		return undefined;
	}

	for (const link of nodeInfoList.links) {
		if (
			/^http:\/\/nodeinfo\.diaspora\.software\/ns\/schema\/(1\.0|1\.1|2\.0|2\.1)/.test(
				link.rel,
			)
		) {
			const nodeInfoResponse = await fetch(link.href);
			const nodeInfo = (await nodeInfoResponse.json()) as NodeInfo;

			return nodeInfo.software.name;
		}
	}

	// not found
	console.warn("No NodeInfo found for domain:", domain);
	return undefined;
};