// bidi controls that ride along on a copied handle: bsky.app wraps handles in
// U+202A…U+202C so they render left to right, and a handle can't contain any
// of these legitimately (handles are ascii), so they only ever spoof or break a lookup
const BIDI_CONTROLS = /[\u200e\u200f\u202a-\u202e\u2066-\u2069]/g;

/**
 * A handle as the legacy appview treated it: bidi controls and surrounding
 * space removed, a leading `@` dropped, and lowercased (handles are
 * case-insensitive). A DID passes through with only the cleanup, since DIDs are
 * case-sensitive.
 */
export const normalizeHandle = (raw: string): string => {
	const handle = raw.replace(BIDI_CONTROLS, "").trim().replace(/^@/, "");
	return handle.startsWith("did:") ? handle : handle.toLowerCase();
};