// dudu 桌面端 · 识别浮层演示
// 在仿真备忘录窗口上方演示完整 push-to-talk 流程：
// 按住按钮（= 按住 ⌘⇧Space）→ 聆听中 → partial 流式 → 松开 → final 注入输入框

const DEMO_SENTENCES = [
  '帮我把这份周报整理一下，重点突出本周的进展和下周的计划。',
  '好的，我马上把文件发给你，大概十分钟之内。',
  '明天上午十点的会改到下午三点，记得同步给项目组。',
];

function OverlayDemo() {
  const { RecognitionOverlay } = window.DuduDesignSystem_2e0172;
  const [phase, setPhase] = React.useState('idle');      // idle | listening | streaming
  const [finalText, setFinalText] = React.useState('');
  const [partialText, setPartialText] = React.useState('');
  const [docText, setDocText] = React.useState('');
  const [sentenceIdx, setSentenceIdx] = React.useState(0);
  const timerRef = React.useRef(null);
  const stateRef = React.useRef({});
  stateRef.current = { finalText, partialText, sentenceIdx };

  const stop = React.useCallback(() => {
    clearInterval(timerRef.current);
    const { finalText: f, partialText: p, sentenceIdx: idx } = stateRef.current;
    const committed = f + p;
    if (committed) {
      setDocText((d) => d + committed);
      setSentenceIdx((idx + 1) % DEMO_SENTENCES.length);
    }
    setFinalText(''); setPartialText('');
    setPhase('idle');
  }, []);

  const start = React.useCallback(() => {
    if (timerRef.current) clearInterval(timerRef.current);
    setPhase('listening'); setFinalText(''); setPartialText('');
    const sentence = DEMO_SENTENCES[stateRef.current.sentenceIdx];
    let i = 0;
    setTimeout(() => setPhase((ph) => (ph === 'listening' ? 'streaming' : ph)), 420);
    timerRef.current = setInterval(() => {
      i += 1;
      if (i >= sentence.length) { clearInterval(timerRef.current); setFinalText(sentence); setPartialText(''); return; }
      // 模拟流式：句读处定稿（final），其余为 partial
      const lastPunct = Math.max(sentence.lastIndexOf('，', i), sentence.lastIndexOf('。', i));
      setFinalText(sentence.slice(0, lastPunct + 1));
      setPartialText(sentence.slice(lastPunct + 1, i));
    }, 90);
  }, []);

  React.useEffect(() => () => clearInterval(timerRef.current), []);

  const overlayState = phase === 'streaming' && (finalText || partialText) ? 'text' : 'listening';

  return (
    <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'center', gap: 28 }}>
      <div style={{ position: 'relative' }}>
        <MacWindow title="备忘录 — 周报草稿" width={560}>
          <div style={{ padding: '18px 20px', minHeight: 150 }}>
            <div style={{ fontSize: 'var(--text-md)', lineHeight: 'var(--leading-loose)', color: 'var(--text-1)', minHeight: 96 }}>
              {docText || <span style={{ color: 'var(--text-3)' }}>光标在这里 — 在任意应用中按住快捷键即可语音输入</span>}
              <span style={{ color: 'var(--accent)', animation: 'dd-caret 1.1s steps(1) infinite' }}>▏</span>
            </div>
          </div>
        </MacWindow>

        {phase !== 'idle' && (
          <div style={{ position: 'absolute', left: '50%', top: '100%', transform: 'translate(-50%, -22px)', animation: 'dd-rise var(--dur-base) var(--ease-out)' }}>
            <RecognitionOverlay
              state={overlayState}
              finalText={finalText}
              partialText={partialText}
              hint="松开 ⌘⇧Space 完成输入"
            />
          </div>
        )}
      </div>

      <div style={{ display: 'flex', alignItems: 'center', gap: 14, marginTop: phase === 'idle' ? 0 : 40 }}>
        <button
          type="button"
          onPointerDown={start}
          onPointerUp={stop}
          onPointerLeave={() => phase !== 'idle' && stop()}
          style={{
            display: 'inline-flex', alignItems: 'center', gap: 8, height: 'var(--control-lg)',
            padding: '0 22px', borderRadius: 'var(--radius-full)', border: 'none', cursor: 'pointer',
            background: phase === 'idle' ? 'var(--accent)' : 'var(--positive)',
            color: 'var(--text-on-accent)', fontSize: 'var(--text-base)', fontWeight: 'var(--weight-semibold)',
            fontFamily: 'var(--font-sans)', userSelect: 'none', WebkitUserSelect: 'none',
            transition: 'background var(--dur-fast) var(--ease-out)',
          }}
        >
          <DuIcons.Mic size={17} />
          {phase === 'idle' ? '按住试一试（模拟按住 ⌘⇧Space）' : '松开完成输入'}
        </button>
        {docText && (
          <button type="button" onClick={() => setDocText('')} style={{
            height: 'var(--control-lg)', padding: '0 16px', borderRadius: 'var(--radius-full)',
            border: '1px solid var(--border-1)', background: 'var(--surface-card)', color: 'var(--text-2)',
            fontSize: 'var(--text-sm)', cursor: 'pointer', fontFamily: 'var(--font-sans)',
          }}>清空</button>
        )}
      </div>
    </div>
  );
}

Object.assign(window, { OverlayDemo });