qwen-code/packages/cli/src/ui/hooks/usePhraseCycler.ts

/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { useState, useEffect, useRef } from 'react';

export const WITTY_LOADING_PHRASES = [
  'Consulting the digital spirits...',
  'Reticulating splines...',
  'Warming up the AI hamsters...',
  'Asking the magic conch shell...',
  'Generating witty retort...',
  'Polishing the algorithms...',
  "Don't rush perfection (or my code)...",
  'Brewing fresh bytes...',
  'Counting electrons...',
  'Engaging cognitive processors...',
  'Checking for syntax errors in the universe...',
  'One moment, optimizing humor...',
  'Shuffling punchlines...',
  'Untangling neural nets...',
  'Compiling brilliance...',
];

export const PHRASE_CHANGE_INTERVAL_MS = 15000;

/**
 * Custom hook to manage cycling through loading phrases.
 * @param isActive Whether the phrase cycling should be active.
 * @param isWaiting Whether to show a specific waiting phrase.
 * @returns The current loading phrase.
 */
export const usePhraseCycler = (isActive: boolean, isWaiting: boolean) => {
  const [currentLoadingPhrase, setCurrentLoadingPhrase] = useState(
    WITTY_LOADING_PHRASES[0],
  );
  const phraseIntervalRef = useRef<NodeJS.Timeout | null>(null);
  const currentPhraseIndexRef = useRef<number>(0);

  useEffect(() => {
    if (isWaiting) {
      setCurrentLoadingPhrase('Waiting for user confirmation...');
      if (phraseIntervalRef.current) {
        clearInterval(phraseIntervalRef.current);
        phraseIntervalRef.current = null;
      }
    } else if (isActive) {
      if (phraseIntervalRef.current) {
        clearInterval(phraseIntervalRef.current);
      }
      // Reset to the first witty phrase when starting to respond
      currentPhraseIndexRef.current = 0;
      setCurrentLoadingPhrase(WITTY_LOADING_PHRASES[0]);

      phraseIntervalRef.current = setInterval(() => {
        currentPhraseIndexRef.current =
          (currentPhraseIndexRef.current + 1) % WITTY_LOADING_PHRASES.length;
        setCurrentLoadingPhrase(
          WITTY_LOADING_PHRASES[currentPhraseIndexRef.current],
        );
      }, PHRASE_CHANGE_INTERVAL_MS);
    } else {
      // Idle or other states, clear the phrase interval
      // and reset to the first phrase for next active state.
      if (phraseIntervalRef.current) {
        clearInterval(phraseIntervalRef.current);
        phraseIntervalRef.current = null;
      }
      setCurrentLoadingPhrase(WITTY_LOADING_PHRASES[0]);
      currentPhraseIndexRef.current = 0;
    }

    return () => {
      if (phraseIntervalRef.current) {
        clearInterval(phraseIntervalRef.current);
        phraseIntervalRef.current = null;
      }
    };
  }, [isActive, isWaiting]);

  return currentLoadingPhrase;
};