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506import { useState, useCallback, useRef } from 'react';
import { Panel, Group as PanelGroup, Separator as PanelResizeHandle } from 'react-resizable-panels';
import { cn } from '@/lib/utils';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { MarkdownViewer } from '@/components/viewer/MarkdownViewer';
import {
Upload,
Loader2,
FileText,
Image as ImageIcon,
Clock,
ChevronLeft,
ChevronRight,
ChevronDown,
ChevronUp,
BarChart3,
Copy,
Check,
} from 'lucide-react';
import { apiFetch } from '@/auth/apiFetch';
interface PageData {
page_number: number;
markdown: string;
image_base64: string | null;
}
interface FigureData {
ref_id: string;
caption: string;
page_number: number;
image_base64: string;
}
interface StepData {
name: string;
description: string;
elapsed_ms: number;
}
interface PipelineResponse {
filename: string;
total_pages: number;
pages: PageData[];
figures: FigureData[];
full_markdown: string;
steps_run: StepData[];
stats: Record<string, unknown>;
}
export function MinimalPage() {
const [uploading, setUploading] = useState(false);
const [error, setError] = useState<string | null>(null);
const [result, setResult] = useState<PipelineResponse | null>(null);
const [currentPageIdx, setCurrentPageIdx] = useState(0);
const [showFullMarkdown, setShowFullMarkdown] = useState(false);
const [showFigures, setShowFigures] = useState(false);
const [imagesScale, setImagesScale] = useState(2.0);
const [doTableStructure, setDoTableStructure] = useState(true);
const [copiedAll, setCopiedAll] = useState(false);
const [copiedImage, setCopiedImage] = useState(false);
const fileInputRef = useRef<HTMLInputElement>(null);
const dropRef = useRef<HTMLDivElement>(null);
const [dragOver, setDragOver] = useState(false);
const currentPage = result?.pages[currentPageIdx] ?? null;
const totalPages = result?.total_pages ?? 0;
/** Convert a base64 PNG string to a Blob. */
const base64ToBlob = useCallback((b64: string, mime = 'image/png'): Blob => {
const bytes = atob(b64);
const buf = new Uint8Array(bytes.length);
for (let i = 0; i < bytes.length; i++) buf[i] = bytes.charCodeAt(i);
return new Blob([buf], { type: mime });
}, []);
/** Copy a single page image to clipboard as PNG. */
const handleCopyImage = useCallback(async () => {
if (!currentPage?.image_base64) return;
try {
const blob = base64ToBlob(currentPage.image_base64);
await navigator.clipboard.write([new ClipboardItem({ 'image/png': blob })]);
setCopiedImage(true);
setTimeout(() => setCopiedImage(false), 1500);
} catch {
// Fallback: some browsers restrict ClipboardItem — fall back to text
navigator.clipboard.writeText(`[Page ${currentPage.page_number} image — clipboard image not supported in this browser]`);
setCopiedImage(true);
setTimeout(() => setCopiedImage(false), 1500);
}
}, [currentPage, base64ToBlob]);
/**
* Copy All: writes both text/html (images + markdown per page) and
* text/plain (full markdown) so the paste target gets the best format.
*/
const handleCopyAll = useCallback(async () => {
if (!result) return;
try {
// Build HTML with inline images + per-page markdown
const htmlParts = result.pages.map((p) => {
const imgTag = p.image_base64
? `<img src="data:image/png;base64,${p.image_base64}" alt="Page ${p.page_number}" style="max-width:100%;margin-bottom:8px;" />`
: '';
// Escape HTML in markdown for the <pre> block
const escapedMd = p.markdown
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>');
return `<h3>Page ${p.page_number}</h3>${imgTag}<pre style="white-space:pre-wrap;font-size:13px;">${escapedMd}</pre>`;
});
const html = `<div>${htmlParts.join('<hr/>')}</div>`;
const htmlBlob = new Blob([html], { type: 'text/html' });
const textBlob = new Blob([result.full_markdown], { type: 'text/plain' });
await navigator.clipboard.write([
new ClipboardItem({ 'text/html': htmlBlob, 'text/plain': textBlob }),
]);
} catch {
// Fallback: plain text only
await navigator.clipboard.writeText(result.full_markdown);
}
setCopiedAll(true);
setTimeout(() => setCopiedAll(false), 1500);
}, [result]);
const handleProcess = useCallback(
async (file: File) => {
setUploading(true);
setError(null);
setResult(null);
setCurrentPageIdx(0);
try {
const formData = new FormData();
formData.append('file', file);
formData.append('images_scale', String(imagesScale));
formData.append('do_table_structure', String(doTableStructure));
const response = await apiFetch('/api/dev/minimal/process', {
method: 'POST',
body: formData,
});
if (!response.ok) {
const detail = await response.text();
throw new Error(`Processing failed (${response.status}): ${detail}`);
}
const data: PipelineResponse = await response.json();
setResult(data);
} catch (err) {
setError(err instanceof Error ? err.message : 'Unknown error');
} finally {
setUploading(false);
}
},
[imagesScale, doTableStructure]
);
const handleDrop = useCallback(
(e: React.DragEvent) => {
e.preventDefault();
setDragOver(false);
const file = e.dataTransfer.files[0];
if (file && file.name.toLowerCase().endsWith('.pdf')) {
handleProcess(file);
} else {
setError('Only PDF files are supported');
}
},
[handleProcess]
);
const handleFileSelect = useCallback(
(e: React.ChangeEvent<HTMLInputElement>) => {
const file = e.target.files?.[0];
if (file) handleProcess(file);
},
[handleProcess]
);
return (
<div className="flex flex-col h-screen bg-gray-50">
{/* Header */}
<header className="flex items-center justify-between px-6 py-3 bg-white border-b shadow-sm">
<div className="flex items-center gap-3">
<h1 className="text-lg font-bold text-uic-blue">Minimal Pipeline</h1>
<span className="text-xs font-medium text-muted-foreground bg-gray-100 px-2 py-0.5 rounded">
Dev Tool
</span>
{result && (
<Button
variant="ghost"
size="sm"
onClick={handleCopyAll}
title="Copy full document markdown"
className={cn(
'gap-1.5 h-7 text-xs',
copiedAll
? 'text-green-600 hover:text-green-700 hover:bg-green-50'
: 'text-muted-foreground hover:text-foreground'
)}
>
{copiedAll ? <Check className="w-3.5 h-3.5" /> : <Copy className="w-3.5 h-3.5" />}
{copiedAll ? 'Copied' : 'Copy All'}
</Button>
)}
</div>
{/* Pipeline options */}
<div className="flex items-center gap-4 text-sm">
<label className="flex items-center gap-1.5">
<span className="text-muted-foreground">Scale:</span>
<Input
type="number"
min={1.0}
max={3.0}
step={0.5}
value={imagesScale}
onChange={(e) => setImagesScale(parseFloat(e.target.value) || 2.0)}
className="w-16 h-7 text-xs"
/>
</label>
<label className="flex items-center gap-1.5 cursor-pointer">
<input
type="checkbox"
checked={doTableStructure}
onChange={(e) => setDoTableStructure(e.target.checked)}
className="rounded border-gray-300"
/>
<span className="text-muted-foreground">Tables</span>
</label>
</div>
</header>
{/* Upload area (when no result) */}
{!result && !uploading && (
<div className="flex-1 flex items-center justify-center p-8">
<div
ref={dropRef}
onDragOver={(e) => { e.preventDefault(); setDragOver(true); }}
onDragLeave={() => setDragOver(false)}
onDrop={handleDrop}
className={cn(
'w-full max-w-lg border-2 border-dashed rounded-xl p-12 text-center transition-colors cursor-pointer',
dragOver ? 'border-uic-blue bg-uic-blue/5' : 'border-gray-300 hover:border-gray-400',
)}
onClick={() => fileInputRef.current?.click()}
>
<Upload className="w-12 h-12 mx-auto mb-4 text-gray-400" />
<p className="text-lg font-medium text-gray-700 mb-1">
Drop a PDF here or click to upload
</p>
<p className="text-sm text-muted-foreground">
Runs raw Docling extraction — no agents, no corrections
</p>
<input
ref={fileInputRef}
type="file"
accept=".pdf"
className="hidden"
onChange={handleFileSelect}
/>
</div>
</div>
)}
{/* Loading state */}
{uploading && (
<div className="flex-1 flex flex-col items-center justify-center gap-4">
<Loader2 className="w-10 h-10 animate-spin text-uic-blue" />
<p className="text-muted-foreground">Extracting document content...</p>
<p className="text-xs text-muted-foreground">Processing time depends on document length and complexity</p>
</div>
)}
{/* Error state */}
{error && (
<div className="flex-1 flex items-center justify-center p-8">
<div className="max-w-md text-center">
<p className="text-red-600 font-medium mb-2">Processing Error</p>
<p className="text-sm text-muted-foreground mb-4">{error}</p>
<Button variant="outline" onClick={() => { setError(null); setResult(null); }}>
Try Again
</Button>
</div>
</div>
)}
{/* Results */}
{result && !uploading && (
<div className="flex-1 flex flex-col min-h-0">
{/* Steps + Stats bar */}
<div className="flex items-center gap-6 px-6 py-2 bg-white border-b text-sm">
{/* Steps */}
<div className="flex items-center gap-2">
<Clock className="w-4 h-4 text-muted-foreground" />
{result.steps_run.map((step) => (
<span
key={step.name}
className="inline-flex items-center gap-1 bg-green-50 text-green-700 px-2 py-0.5 rounded text-xs font-medium"
title={step.description}
>
{step.name}
<span className="text-green-500">{(step.elapsed_ms / 1000).toFixed(1)}s</span>
</span>
))}
</div>
<div className="w-px h-4 bg-gray-200" />
{/* Stats */}
<div className="flex items-center gap-3 text-xs text-muted-foreground">
<span className="flex items-center gap-1">
<FileText className="w-3.5 h-3.5" />
{result.total_pages} pages
</span>
<span className="flex items-center gap-1">
<BarChart3 className="w-3.5 h-3.5" />
{result.stats.chars_per_page as number} chars/page
</span>
{(result.stats.is_likely_scanned as boolean) && (
<span className="text-amber-600 font-medium">Likely scanned</span>
)}
{result.figures.length > 0 && (
<span className="flex items-center gap-1">
<ImageIcon className="w-3.5 h-3.5" />
{result.figures.length} figures
</span>
)}
</div>
<div className="flex-1" />
{/* Page nav */}
<div className="flex items-center gap-2">
<Button
variant="ghost"
size="sm"
disabled={currentPageIdx === 0}
onClick={() => setCurrentPageIdx((i) => Math.max(0, i - 1))}
className="h-7 w-7 p-0"
>
<ChevronLeft className="w-4 h-4" />
</Button>
<span className="text-xs font-medium min-w-[60px] text-center">
Page {currentPageIdx + 1} / {totalPages}
</span>
<Button
variant="ghost"
size="sm"
disabled={currentPageIdx >= totalPages - 1}
onClick={() => setCurrentPageIdx((i) => Math.min(totalPages - 1, i + 1))}
className="h-7 w-7 p-0"
>
<ChevronRight className="w-4 h-4" />
</Button>
</div>
{/* New upload button */}
<Button
variant="outline"
size="sm"
className="h-7 text-xs"
onClick={() => { setResult(null); setError(null); }}
>
<Upload className="w-3.5 h-3.5 mr-1" />
New PDF
</Button>
</div>
{/* Page sidebar + split view */}
<div className="flex-1 flex min-h-0">
{/* Page sidebar */}
{totalPages > 1 && (
<div className="w-16 border-r bg-white overflow-y-auto flex-shrink-0">
{result.pages.map((page, idx) => (
<button
key={page.page_number}
onClick={() => setCurrentPageIdx(idx)}
className={cn(
'w-full py-2 text-xs font-medium border-b transition-colors',
idx === currentPageIdx
? 'bg-uic-blue/10 text-uic-blue border-l-2 border-l-uic-blue'
: 'text-muted-foreground hover:bg-gray-50',
)}
>
{page.page_number}
</button>
))}
</div>
)}
{/* Split view: image | markdown */}
<PanelGroup orientation="horizontal" className="flex-1">
{/* Left: page image */}
<Panel defaultSize={45} minSize={20}>
<div className="h-full flex flex-col">
{/* Image toolbar */}
{currentPage?.image_base64 && (
<div className="flex items-center justify-between px-4 py-2 border-b bg-gray-50">
<span className="text-sm font-medium text-muted-foreground">
Page {currentPage.page_number} Image
</span>
<Button
variant="ghost"
size="sm"
onClick={handleCopyImage}
title="Copy page image"
className={cn(
'gap-1.5',
copiedImage
? 'text-green-600 hover:text-green-700 hover:bg-green-50'
: 'text-muted-foreground hover:text-foreground'
)}
>
{copiedImage ? <Check className="w-4 h-4" /> : <Copy className="w-4 h-4" />}
<span className="text-xs">{copiedImage ? 'Copied' : 'Copy Image'}</span>
</Button>
</div>
)}
<div className="flex-1 overflow-auto bg-gray-100 flex items-start justify-center p-4">
{currentPage?.image_base64 ? (
<img
src={`data:image/png;base64,${currentPage.image_base64}`}
alt={`Page ${currentPage.page_number}`}
className="max-w-full shadow-lg rounded"
/>
) : (
<div className="text-muted-foreground text-sm mt-20">No image available</div>
)}
</div>
</div>
</Panel>
<PanelResizeHandle className="w-1.5 bg-gray-200 hover:bg-uic-blue/30 transition-colors cursor-col-resize" />
{/* Right: page markdown */}
<Panel defaultSize={55} minSize={20}>
<MarkdownViewer
content={currentPage?.markdown ?? ''}
isComplete={true}
onCopy={() => {
if (currentPage?.markdown) {
navigator.clipboard.writeText(currentPage.markdown);
}
}}
/>
</Panel>
</PanelGroup>
</div>
{/* Collapsible sections at bottom */}
<div className="border-t bg-white">
{/* Full document markdown */}
<button
onClick={() => setShowFullMarkdown(!showFullMarkdown)}
className="w-full flex items-center justify-between px-6 py-2 hover:bg-gray-50 transition-colors text-sm font-medium text-muted-foreground"
>
<span>Full Document Markdown</span>
{showFullMarkdown ? <ChevronUp className="w-4 h-4" /> : <ChevronDown className="w-4 h-4" />}
</button>
{showFullMarkdown && (
<div className="max-h-80 overflow-auto border-t">
<MarkdownViewer content={result.full_markdown} isComplete={true} />
</div>
)}
{/* Figures */}
{result.figures.length > 0 && (
<>
<button
onClick={() => setShowFigures(!showFigures)}
className="w-full flex items-center justify-between px-6 py-2 hover:bg-gray-50 transition-colors text-sm font-medium text-muted-foreground border-t"
>
<span>Extracted Figures ({result.figures.length})</span>
{showFigures ? <ChevronUp className="w-4 h-4" /> : <ChevronDown className="w-4 h-4" />}
</button>
{showFigures && (
<div className="max-h-96 overflow-auto border-t p-4 grid grid-cols-2 md:grid-cols-3 gap-4">
{result.figures.map((fig, idx) => (
<div key={idx} className="border rounded-lg overflow-hidden bg-gray-50">
<img
src={`data:image/png;base64,${fig.image_base64}`}
alt={fig.caption || `Figure from page ${fig.page_number}`}
className="w-full"
/>
{fig.caption && (
<p className="p-2 text-xs text-muted-foreground">{fig.caption}</p>
)}
<p className="px-2 pb-2 text-xs text-gray-400">Page {fig.page_number}</p>
</div>
))}
</div>
)}
</>
)}
</div>
</div>
)}
</div>
);
}