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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 };
|