// at-uri helpers: at://<authority>/<collection>/<rkey>

import { parseResourceUri } from "@atcute/lexicons/syntax";
import { recordKeyOf, type Rkey } from "$lib/api/syntax";

const legacyAuthority = (uri: string): string => {
	const rest = uri.startsWith("at://") ? uri.slice(5) : uri;
	const slash = rest.indexOf("/");
	return slash === -1 ? rest : rest.slice(0, slash);
};

export const didFromUri = (uri: string): string => {
	try {
		return parseResourceUri(uri).repo;
	} catch {
		return legacyAuthority(uri);
	}
};

// on a knot the uri names the repo, and x-tngl-editor is whoever wrote the latest version
export const authorDidOf = (record: { uri: string; value?: unknown }): string => {
	const editor = (record.value as Record<string, unknown> | undefined)?.["x-tngl-editor"];
	return typeof editor === "string" ? editor : didFromUri(record.uri);
};

export const rkeyFromUri = (uri: string): Rkey => {
	const fallback = uri.slice(uri.lastIndexOf("/") + 1);
	try {
		return recordKeyOf(parseResourceUri(uri).rkey ?? fallback);
	} catch {
		return recordKeyOf(fallback);
	}
};