const [cards, setCards] = useState([]);

const [currentIndex, setCurrentIndex] = useState(0);

const [isFlipped, setIsFlipped] = useState(false);

const [fileName, setFileName] = useState('');

const fileInputRef = useRef(null);

const { addToast } = useToast();

const handleFileUpload = (event) => {

const file = event.target.files[0];

if (!file) return;

if (file.type !== 'text/csv' && !file.name.endsWith('.csv')) {

addToast({

title: 'Invalid File',

message: 'Please upload a valid CSV file.',

type: 'error',

});

return;

}

setFileName(file.name);

const reader = new FileReader();

reader.onload = (e) => {

const text = e.target.result;

parseCSV(text);

};

reader.readAsText(file);

};

const parseCSV = (text) => {

try {

// Basic CSV parser

const lines = text.split(/\r?\n/).filter((line) => line.trim() !== '');

if (lines.length < 1) {

throw new Error('File is empty');

}

const parsedCards = lines

.map((line, index) => {

// Handle basic comma separation, respecting quotes could be added here if needed

// For now, simple split, assuming no commas in content or handle simple cases

const parts = line.split(',');

// If we have more than 2 parts, join the rest for the answer or question?

// Let's assume Col 1 = Question, Col 2 = Answer.

if (parts.length < 2) return null;

const question = parts[0].trim();

const answer = parts.slice(1).join(',').trim(); // Re-join rest in case answer had commas

return { id: index, question, answer };

})

.filter((card) => card !== null);

if (parsedCards.length === 0) {

throw new Error('No valid cards found');

}

setCards(parsedCards);

setCurrentIndex(0);

setIsFlipped(false);

addToast({

title: 'Success',

message: `Loaded ${parsedCards.length} cards.`,

type: 'success',

});

} catch (error) {

console.error(error);

addToast({

title: 'Error',

message: 'Failed to parse CSV. Ensure format is: Question,Answer',

type: 'error',

});

setCards([]);

}

};

const handleNext = () => {

setIsFlipped(false);

setTimeout(() => {

setCurrentIndex((prev) => (prev + 1) % cards.length);

}, 300);

};

const handlePrev = () => {

setIsFlipped(false);

setTimeout(() => {

setCurrentIndex((prev) => (prev - 1 + cards.length) % cards.length);

}, 300);

};

const handleShuffle = () => {

const shuffled = [...cards].sort(() => Math.random() - 0.5);

setCards(shuffled);

setCurrentIndex(0);

setIsFlipped(false);

addToast({

title: 'Shuffled',

message: 'Deck shuffled.',

duration: 2000,

});

};

const handleReset = () => {

setCards([]);

setFileName('');

setCurrentIndex(0);

setIsFlipped(false);

if (fileInputRef.current) {

fileInputRef.current.value = '';

}

};

const handleFlip = () => {

setIsFlipped(!isFlipped);

};

return (

<div className="min-h-screen bg-[#050505] text-white selection:bg-indigo-500/30 font-sans">

<Seo

title="CSV Flashcards | Fezcodex"

description="Study tool. Load custom flashcards via CSV."

keywords={['Fezcodex', 'Flashcards', 'CSV', 'Study', 'Memory']}

/>

<div className="mx-auto max-w-5xl px-6 py-24 md:px-12">

<header className="mb-12">

<Link

to="/apps"

className="mb-8 inline-flex items-center gap-2 text-xs font-mono text-gray-500 hover:text-white transition-colors uppercase tracking-widest"

>

<ArrowLeftIcon weight="bold" />

<span>Applications</span>

</Link>

<div className="flex flex-col md:flex-row md:items-end justify-between gap-12">

<div className="space-y-4">

<BreadcrumbTitle

title="Flashcard Forge"

slug="csv-deck"

variant="brutalist"

/>

<p className="text-xl text-gray-400 max-w-2xl font-light leading-relaxed">

Memory retention protocol. Upload structured CSV data

(Question,Answer) to initiate a recall session.

</p>

</div>

</div>

</header>

{cards.length === 0 ? (

<div

className="border border-dashed border-white/20 bg-white/[0.02] rounded-sm p-12 text-center hover:bg-white/[0.04] transition-colors group cursor-pointer"

onClick={() => fileInputRef.current.click()}

>

<input

type="file"

accept=".csv"

className="hidden"

ref={fileInputRef}

onChange={handleFileUpload}

/>

<div className="mb-6 flex justify-center">

<div className="p-4 bg-indigo-500/10 rounded-full group-hover:bg-indigo-500/20 transition-colors">

<UploadSimpleIcon size={48} className="text-indigo-400" />

</div>

</div>

<h3 className="text-lg font-bold mb-2">Upload CSV Deck</h3>

<p className="text-gray-500 text-sm max-w-sm mx-auto">

Drag and drop or click to select a file. <br />

Format:{' '}

<span className="font-mono text-indigo-300">

Question,Answer

</span>{' '}

(No header required)

</p>

</div>

) : (

<div className="space-y-8">

{/* Controls Header */}

<div className="flex flex-wrap items-center justify-between gap-4 p-4 border border-white/10 bg-white/[0.02]">

<div className="flex items-center gap-4 text-sm font-mono text-gray-400">

<CardsIcon size={20} />

<span>{fileName}</span>

<span className="w-px h-4 bg-white/10" />

<span className="text-white">

Card {currentIndex + 1}{' '}

<span className="text-gray-600">/</span> {cards.length}

</span>

</div>

<div className="flex gap-2">

<button

onClick={handleShuffle}

className="p-2 hover:bg-white/10 rounded-sm text-gray-400 hover:text-white transition-colors"

title="Shuffle Deck"

>

<ShuffleIcon size={20} />

</button>{' '}

<button

onClick={handleReset}

className="p-2 hover:bg-red-500/10 rounded-sm text-gray-400 hover:text-red-400 transition-colors"

title="Unload Deck"

>

<ArrowCounterClockwiseIcon size={20} />

</button>

</div>

</div>

{/* Card Area */}

<div

className="w-full aspect-[3/2] md:aspect-[2/1] relative cursor-pointer group"

onClick={handleFlip}

style={{ perspective: '1000px' }}

>

<motion.div

className="w-full h-full relative preserve-3d transition-transform duration-500"

animate={{ rotateY: isFlipped ? 180 : 0 }}

transition={{ type: 'spring', stiffness: 260, damping: 20 }}

style={{ transformStyle: 'preserve-3d' }}

>

{/* Front */}

<div

className="absolute inset-0 bg-black border border-white/10 flex flex-col items-center justify-center p-8 md:p-16 text-center select-none shadow-2xl overflow-y-auto scrollbar-thin scrollbar-track-transparent scrollbar-thumb-white/20"

style={{

backfaceVisibility: 'hidden',

transform: 'rotateY(0deg) translateZ(1px)',

}}

>

{' '}

<div className="absolute inset-0 opacity-10 pointer-events-none">

<GenerativeArt

seed={`card-${currentIndex}-front`}

className="w-full h-full"

/>

</div>

<div className="absolute top-4 left-4 text-[10px] font-mono uppercase tracking-widest text-indigo-400">

Query

</div>

<h2 className="text-2xl md:text-4xl font-light leading-tight relative z-10">

{cards[currentIndex]?.question}

</h2>

<div className="absolute bottom-6 text-xs text-gray-600 font-mono animate-pulse">

Click to Reveal

</div>

</div>

{/* Back */}

<div

className="absolute inset-0 bg-white text-black flex flex-col items-center justify-center p-8 md:p-16 text-center select-none shadow-2xl overflow-y-auto scrollbar-thin scrollbar-track-transparent scrollbar-thumb-black/20"

style={{

transform: 'rotateY(180deg) translateZ(1px)',

backfaceVisibility: 'hidden',

backgroundColor: 'white',

}}

>

<div className="absolute inset-0 opacity-60 pointer-events-none">

<LuxeArt

seed={`card-${currentIndex}-back`}

colorful={true}

className="w-full h-full mix-blend-multiply"

/>

</div>

<div className="absolute top-4 left-4 text-[10px] font-mono uppercase tracking-widest text-indigo-600 font-bold">

Response

</div>

<h2 className="text-2xl md:text-4xl font-bold leading-tight relative z-10">

{cards[currentIndex]?.answer}

</h2>

</div>

</motion.div>

</div>

{/* Navigation */}

<div className="grid grid-cols-2 gap-4">

<button

onClick={handlePrev}

className="flex items-center justify-center gap-3 p-4 border border-white/10 hover:bg-white/5 transition-all active:scale-[0.98] group"

>

<ArrowLeftIcon className="group-hover:-translate-x-1 transition-transform" />

<span className="font-mono uppercase tracking-widest text-sm">

Previous

</span>

</button>

<button

onClick={handleNext}

className="flex items-center justify-center gap-3 p-4 bg-white text-black hover:bg-indigo-400 transition-all active:scale-[0.98] group"

>

<span className="font-mono uppercase tracking-widest text-sm font-bold">

Next

</span>

<ArrowRightIcon className="group-hover:translate-x-1 transition-transform" />

</button>

</div>

</div>

)}

</div>

</div>

);