export const CONTACT_DOCUMENT_SCOPE_PREFIX = "contact:";

export function buildContactDocumentScope(contactId: string, contactName: string) {
  return `${CONTACT_DOCUMENT_SCOPE_PREFIX}${encodeURIComponent(contactId)}:${encodeURIComponent(contactName)}`;
}

export function parseContactDocumentScope(scope: string) {
  const raw = String(scope ?? "").trim();
  if (!raw.startsWith(CONTACT_DOCUMENT_SCOPE_PREFIX)) return null;
  const payload = raw.slice(CONTACT_DOCUMENT_SCOPE_PREFIX.length);
  const [idRaw, ...nameParts] = payload.split(":");
  const contactId = decodeURIComponent(idRaw ?? "").trim();
  const contactName = decodeURIComponent(nameParts.join(":") ?? "").trim();
  if (!contactId) return null;
  return {
    contactId,
    contactName,
  };
}

export function formatDocumentScope(scope: string) {
  const linked = parseContactDocumentScope(scope);
  if (!linked) return scope;
  return linked.contactName ? `Contact · ${linked.contactName}` : "Contact document";
}

export function isDocumentLinkedToContact(
  scope: string,
  contact: { id: string; name: string } | null | undefined,
) {
  if (!contact) return false;
  const linked = parseContactDocumentScope(scope);
  if (!linked) return false;
  if (linked.contactId) return linked.contactId === contact.id;
  return Boolean(linked.contactName && linked.contactName === contact.name);
}