'use client';
 
import { useEffect, useMemo, useState } from 'react';
 
export interface TextStreamOptions {
  /** Words revealed per second. */
  speed?: number;
  /** Pauses the reveal while false, keeping what is already shown. */
  enabled?: boolean;
}
 
export interface TextStream {
  /** The text revealed so far, always ending on a whole word. */
  text: string;
  /** True once every word of `source` is shown. */
  done: boolean;
  /** Shows the rest of the text at once, e.g. when the user skips ahead. */
  skip: () => void;
}
 
/**
 * Reveals `source` a word at a time at a steady pace. When `source` grows (a
 * response still arriving from the model) the reveal continues from where it
 * is; when it is replaced with unrelated text it starts over. Readers who
 * prefer reduced motion get the full text immediately.
 */
export function useTextStream(source: string, { speed = 30, enabled = true }: TextStreamOptions = {}): TextStream {
  const words = useMemo(() => source.match(/\S+\s*|\s+/g) ?? [], [source]);