# All files / src/pages HomePage.tsx

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     import { useState, useCallback, useRef, useEffect } from 'react';
    import { ArrowLeftRight, Copy, Trash2, Volume2, Sparkles, History, Zap } from 'lucide-react';
    import { useToast } from '../components/ui/Toast';
    import { translateApi } from '../api/translate';
    import { userApi } from '../api/user';
    import { LANGUAGE_CODES } from '../api/types';
    import type { UserQuota } from '../api/types';
    import { useTranslation } from 'react-i18next';

    function HomePage() {
      const { t } = useTranslation();
      const { error: toastError, info, success } = useToast();
      const [sourceText, setSourceText] = useState('');
      const [translatedText, setTranslatedText] = useState('');
      const [sourceLang, setSourceLang] = useState('auto');
      const [targetLang, setTargetLang] = useState('zh');
      const [engine, setEngine] = useState<'ai' | 'fast'>('ai');
      const [loading, setLoading] = useState(false);
      const [costTime, setCostTime] = useState(0);
      const [quota, setQuota] = useState<UserQuota | null>(null);
      const streamAbortRef = useRef(false);

      useEffect(() => {
        const token = localStorage.getItem('authToken');
        if (token) {
          userApi.getQuota()
            .then(({ data }) => setQuota(data))
            .catch((err) => {
              console.warn('获取配额失败:', err);
              setQuota(null);
            });
        } else {
          setQuota(null);
        }
      }, []);

      const sameLangDisabled = sourceLang !== 'auto' && sourceLang === targetLang;

      const handleTranslate = useCallback(async () => {
        if (sameLangDisabled) { info(t('home.errors.sameLanguage')); return; }
        if (!sourceText.trim()) { info(t('home.errors.noText')); return; }
        streamAbortRef.current = false;
        setLoading(true);
        setTranslatedText('');
        setCostTime(0);
        const startTime = Date.now();

        await translateApi.streamTranslate(
          { text: sourceText, sourceLang, targetLang, engine, mode: engine === 'ai' ? 'expert' : 'fast' },
          (chunk) => {
            if (!streamAbortRef.current) {
              // 还原后端为 SSE 安全而替换的换行占位符
              const restored = chunk.replace(/§NL§/g, '\n');
              setTranslatedText(prev => prev + restored);
            }
          },
          () => { setCostTime(Date.now() - startTime); setLoading(false); },
          (err) => { toastError(err); setLoading(false); },
        );
      }, [sourceText, sourceLang, targetLang, engine, sameLangDisabled, t]);

      const handleSwap = useCallback(() => {
        if (sourceLang === 'auto') return;
        setSourceLang(targetLang);
        setTargetLang(sourceLang);
        if (translatedText) {
          setSourceText(translatedText);
          setTranslatedText(sourceText);
        }
      }, [sourceLang, targetLang, sourceText, translatedText]);

      const handleCopy = async () => {
        try { await navigator.clipboard.writeText(translatedText); success(t('translationResult.copied')); }
        catch { toastError(t('translationResult.copyFailed')); }
      };
      const handleSpeak = () => {
        if (!translatedText || !window.speechSynthesis) return;
        window.speechSynthesis.speak(new SpeechSynthesisUtterance(translatedText));
      };
      const handleClearResult = () => setTranslatedText('');
      const handleClearSource = () => setSourceText('');

      useEffect(() => {
        const handleKeyDown = (e: KeyboardEvent) => {
          if ((e.ctrlKey || e.metaKey) && e.key === 'Enter' && sourceText.trim() && !loading) {
            e.preventDefault();
            handleTranslate();
          }
        };
        window.addEventListener('keydown', handleKeyDown);
        return () => window.removeEventListener('keydown', handleKeyDown);
      }, [sourceText, loading, handleTranslate]);

      const maxChars = quota ? quota.remainingChars : undefined;
      const progressPercent = loading && translatedText.length > 0
        ? Math.min(100, Math.round((translatedText.length / Math.max(1, sourceText.length)) * 100))
        : 0;

      return (
        <div className="py-12 pb-20">
          <div className="mb-8 text-center">
            <h1 className="text-[32px] font-bold text-text-primary mb-2 tracking-tight">
              NovelTrans {t('home.title')}
            </h1>
            <p className="text-[15px] text-text-secondary">
              {t('home.subtitle')}
            </p>
          </div>

          <div className="border border-border rounded-xl shadow-sm bg-surface overflow-hidden">
            <div className="flex flex-col lg:flex-row">
              {/* Source Panel */}
              <div className="flex-1 min-h-[480px] flex flex-col">
                <div className="flex items-center gap-4 px-6 h-[52px] border-b border-border bg-surface-secondary/50">
                  <select
                    value={sourceLang}
                    onChange={(e) => setSourceLang(e.target.value)}
                    className="bg-transparent text-text-primary text-[14px] font-medium cursor-pointer hover:text-accent transition-colors focus:outline-none whitespace-nowrap border-none"
                    title={t('home.language.selectSource')}
                  >
                    {LANGUAGE_CODES.map(code => (
                      <option key={code} value={code}>{t(`common.languages.${code}`)}</option>
                    ))}
                  </select>

                  <button
                    onClick={handleSwap}
                    disabled={sourceLang === 'auto'}
                    className={`flex-shrink-0 w-8 h-8 flex items-center justify-center rounded-full transition-all ${
                      sourceLang === 'auto'
                        ? 'text-gray-300 cursor-not-allowed'
                        : 'text-text-tertiary hover:text-accent hover:bg-accent-bg'
                    }`}
                    title={t('home.actions.swapLanguages')}
                  >
                    <ArrowLeftRight className="w-4 h-4" />
                  </button>

                  <select
                    value={targetLang}
                    onChange={(e) => setTargetLang(e.target.value)}
                    className="bg-transparent text-text-primary text-[14px] font-medium cursor-pointer hover:text-accent transition-colors focus:outline-none whitespace-nowrap border-none"
                    title={t('home.language.selectTarget')}
                  >
                    {LANGUAGE_CODES.filter(c => c !== 'auto').map(code => (
                      <option key={code} value={code}>{t(`common.languages.${code}`)}</option>
                    ))}
                  </select>
                </div>

                <div className="flex-1 p-6 flex flex-col">
                  <textarea
                    value={sourceText}
                    onChange={e => setSourceText(e.target.value)}
                    placeholder={t('home.inputPlaceholder')}
                    maxLength={maxChars}
                    className="flex-1 w-full resize-none bg-transparent text-text-primary text-[17px] leading-relaxed placeholder:text-text-placeholder focus:outline-none"
                  />
                  <div className="flex items-center justify-between pt-4 text-[12px] text-text-tertiary">
                    <span className="font-mono">{sourceText.length.toLocaleString()} 字符</span>
                    {sourceText && (
                      <button
                        onClick={handleClearSource}
                        className="hover:text-accent transition-colors font-medium flex items-center gap-1"
                      >
                        <Trash2 className="w-3 h-3" />
                        {t('home.actions.clear')}
                      </button>
                    )}
                  </div>
                </div>
              </div>

              <div className="hidden lg:block w-px bg-gradient-to-b from-transparent via-border to-transparent mx-0" />

              {/* Result Panel */}
              <div className="flex-1 min-h-[480px] flex flex-col">
                <div className="flex items-center justify-between px-6 h-[52px] border-b border-border bg-surface-secondary/50">
                  <select
                    value={engine}
                    onChange={(e) => setEngine(e.target.value as 'ai' | 'fast')}
                    className="bg-transparent text-text-primary text-[14px] font-medium cursor-pointer hover:text-accent transition-colors focus:outline-none whitespace-nowrap border-none"
                    title={t('home.language.selectEngine')}
                  >
                    <option value="ai">{t('languageSelector.expert')}</option>
                    <option value="fast">{t('languageSelector.fast')}</option>
                  </select>

                  {(translatedText || loading) && (
                    <div className="flex items-center gap-1">
                      {translatedText && !loading && (
                        <>
                          <button
                            onClick={handleCopy}
                            className="p-2 rounded-lg text-text-tertiary hover:text-accent hover:bg-accent-bg transition-colors"
                            title={t('home.resultActions.copy')}
                          >
                            <Copy className="w-4 h-4" />
                          </button>
                          <button
                            onClick={handleSpeak}
                            className="p-2 rounded-lg text-text-tertiary hover:text-accent hover:bg-accent-bg transition-colors"
                            title={t('home.resultActions.speak')}
                          >
                            <Volume2 className="w-4 h-4" />
                          </button>
                        </>
                      )}
                      <button
                        onClick={handleClearResult}
                        className="p-2 rounded-lg text-text-tertiary hover:text-red hover:bg-red-bg transition-colors"
                        title={t('home.resultActions.clear')}
                      >
                        <Trash2 className="w-4 h-4" />
                      </button>
                    </div>
                  )}
                </div>

                <div className="flex-1 p-6 relative overflow-y-auto">
                  {loading ? (
                    <div className="space-y-2">
                      <div className="text-[17px] leading-relaxed text-text-primary whitespace-pre-wrap break-words pr-16">
                        {translatedText ? translatedText.split('\n').map((line, i) => (
                          <span key={i}>
                            {line}
                            {i < translatedText.split('\n').length - 1 && <br />}
                          </span>
                        )) : (
                          <span className="text-text-placeholder/40">{t('home.actions.translating')}</span>
                        )}
                        <span className="text-accent inline-block animate-pulse ml-0.5">▋</span>
                      </div>
                      {progressPercent > 0 && (
                        <div className="mt-4">
                          <div className="flex items-center justify-between text-[12px] text-text-tertiary mb-1">
                            <span className="flex items-center gap-1">
                              {engine === 'ai' ? <Sparkles className="w-3 h-3" /> : <Zap className="w-3 h-3" />}
                              {t('home.progress')}
                            </span>
                            <span className="font-mono">{progressPercent}%</span>
                          </div>
                          <div className="w-full h-1.5 bg-surface-secondary rounded-full overflow-hidden">
                            <div
                              className="h-full bg-gradient-brand transition-all duration-300 ease-out"
                              style={{ width: `${progressPercent}%` }}
                            />
                          </div>
                        </div>
                      )}
                    </div>
                  ) : translatedText ? (
                    <div>
                      <div className="text-[17px] leading-relaxed text-text-primary whitespace-pre-wrap break-words pr-16">
                        {translatedText.split('\n').map((line, i) => (
                          <span key={i}>
                            {line}
                            {i < translatedText.split('\n').length - 1 && <br />}
                          </span>
                        ))}
                      </div>
                      <div className="mt-4 flex items-center gap-2 text-[12px] text-text-tertiary">
                        {engine === 'ai' ? (
                          <>
                            <Sparkles className="w-3.5 h-3.5 text-accent" />
                            <span>{t('home.qualities.accurate')}</span>
                          </>
                        ) : (
                          <>
                            <Zap className="w-3.5 h-3.5 text-yellow" />
                            <span>{t('home.qualities.fast')}</span>
                          </>
                        )}
                      </div>
                    </div>
                  ) : (
                    <div className="flex flex-col items-center justify-center h-full text-center space-y-4">
                      <div className="w-16 h-16 rounded-full bg-surface-secondary flex items-center justify-center">
                        <Sparkles className="w-8 h-8 text-text-tertiary" />
                      </div>
                      <div>
                        <p className="text-[15px] text-text-secondary font-medium mb-1">{t('home.result.placeholder')}</p>
                        <p className="text-[13px] text-text-tertiary">{t('home.result.hint')}</p>
                      </div>
                      <div className="flex items-center gap-2 text-[12px] text-text-tertiary">
                        <History className="w-3.5 h-3.5" />
                        <span>{t('home.notification')}</span>
                      </div>
                    </div>
                  )}
                  {costTime > 0 && !loading && (
                    <span className="absolute bottom-4 right-6 text-[11px] text-text-tertiary font-mono bg-surface-secondary px-2 py-1 rounded flex items-center gap-1">
                      <Zap className="w-3 h-3" />
                      {(costTime / 1000).toFixed(1)}s
                    </span>
                  )}
                </div>
              </div>
            </div>

            <div className="flex items-center justify-between px-6 py-3 border-t border-border bg-surface-secondary">
              <div className="flex items-center gap-4 text-[12px] text-text-tertiary">
                {quota ? (
                  <div className="flex items-center gap-2">
                    <span>{t('home.quota.remaining')}:</span>
                    <span className={`font-mono font-medium ${
                      quota.remainingChars < 1000 ? 'text-red' : 'text-text-primary'
                    }`}>
                      {quota.remainingChars.toLocaleString()}
                    </span>
                    <span className="text-text-placeholder">/</span>
                    <span className="font-mono text-text-secondary">
                      {quota.monthlyChars.toLocaleString()}
                    </span>
                  </div>
                ) : (
                  <div className="flex items-center gap-2">
                    <span className="text-text-placeholder">{t('home.quota.loginHint')}</span>
                    <a
                      href="/login"
                      className="text-accent hover:text-accent-hover transition-colors font-medium"
                    >
                      {t('home.quota.loginNow')}
                    </a>
                  </div>
                )}
                <span className="hidden sm:inline text-text-placeholder">|</span>
                <span className="hidden sm:inline text-text-placeholder text-[11px]">
                  {t('home.shortcut')}
                </span>
              </div>
              <button
                onClick={handleTranslate}
                disabled={!sourceText.trim() || loading || sameLangDisabled}
                title={sameLangDisabled ? t('home.errors.sameLanguage') : ''}
                className={`
                  px-8 py-2 text-[14px] font-semibold text-white rounded-lg
                  bg-gradient-brand transition-all duration-200 shadow-sm
                  hover:shadow-md hover:opacity-90 active:scale-95
                  disabled:opacity-30 disabled:cursor-not-allowed disabled:shadow-none
                  ${loading ? 'animate-pulse' : ''}
                `}
              >
                {loading ? t('home.actions.translating') : t('home.actions.startTranslate')}
              </button>
            </div>
          </div>
        </div>
      );
    }

    export { HomePage };