import * as Y from "yjs";

/**
 * Encode full Yjs document state as a base64 string for JSONB storage.
 */
export function yDocToBase64(doc: Y.Doc): string {
  return Buffer.from(Y.encodeStateAsUpdate(doc)).toString("base64");
}

/**
 * Decode a base64 string to a Yjs update payload.
 */
export function base64ToYUpdate(base64: string): Uint8Array {
  return new Uint8Array(Buffer.from(base64, "base64"));
}

const OBJECT_PREFIX = "object:";

/**
 * Parse collaboration document names of the form `object:{uuid}`.
 */
export function extractObjectId(documentName: string): string | null {
  if (!documentName.startsWith(OBJECT_PREFIX)) {
    return null;
  }
  const id = documentName.slice(OBJECT_PREFIX.length).trim();
  return id.length > 0 ? id : null;
}