// Check if a value is a strong ref
// Strong refs have both 'uri' and 'cid' fields
const isStrongRef = (value: unknown): boolean => {
  if (typeof value !== "object" || value === null) return false;
  const obj = value as Record<string, unknown>;
  return typeof obj.uri === "string" &&
         typeof obj.cid === "string" &&
         obj.uri.startsWith("at://");
};

// Extract URI from a strong ref
export const getStrongRefUri = (value: unknown): string | null => {
  if (!isStrongRef(value)) return null;
  const obj = value as Record<string, unknown>;
  return obj.uri as string;
};

// Check if a string value is an AT-URI
export const isAtUri = (value: unknown): boolean => {
  return typeof value === "string" && value.startsWith("at://");
};

// Parse AT-URI to extract collection
// Format: at://did/collection/rkey
export const parseAtUri = (uri: string): { did: string; collection: string; rkey: string } | null => {
  if (!uri.startsWith("at://")) return null;
  const parts = uri.slice(5).split("/"); // Remove "at://" and split
  if (parts.length !== 3) return null;
  return {
    did: parts[0],
    collection: parts[1],
    rkey: parts[2],
  };
};