/** Prefix host-injected context onto the user query for embed chat. */
export function buildQueryWithHostContext(
  query: string,
  hostContext?: Record<string, unknown>,
): string {
  if (!hostContext || !Object.keys(hostContext).length) return query
  const lines = Object.entries(hostContext)
    .filter(([, v]) => v !== undefined && v !== null && v !== '')
    .map(([k, v]) => `${k}: ${typeof v === 'string' ? v : JSON.stringify(v)}`)
  if (!lines.length) return query
  return `[Host context]\n${lines.join('\n')}\n\n${query}`
}