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992import { useState, useCallback, useRef, useEffect, useMemo } from 'react';
import { Panel, Group as PanelGroup, Separator as PanelResizeHandle } from 'react-resizable-panels';
import { cn } from '@/lib/utils';
import { buildMarkdownBundle, triggerBlobDownload } from '@/lib/bundleDownload';
import { Button } from '@/components/ui/button';
import { MarkdownViewer } from '@/components/viewer/MarkdownViewer';
import { StageTabs } from '@/components/pipeline-viewer/StageTabs';
import { PIPELINE_STAGES, REVIEW_STAGE } from '@/types/pipeline-viewer';
// import { ChangesSidebar } from '@/components/pipeline-viewer/ChangesSidebar';
import { ChangesModal } from '@/components/pipeline-viewer/ChangesModal';
import { StructureMetadataModal } from '@/components/pipeline-viewer/StructureMetadataModal';
import { WarningsBanner } from '@/components/pipeline-viewer/WarningsBanner';
import { KeyboardShortcuts, type FocusRegion } from '@/components/pipeline-viewer/KeyboardShortcuts';
import { ClassificationError } from '@/components/pipeline-viewer/ClassificationError';
import { FeedbackModal } from '@/components/pipeline-viewer/FeedbackModal';
import { PiiReviewPanel } from '@/components/pipeline-viewer/PiiReviewPanel';
import { usePipelineViewer } from '@/hooks/usePipelineViewer';
import { useFeedbackConfig } from '@/hooks/useFeedbackConfig';
import {
Upload,
Loader2,
FileText,
Image as ImageIcon,
BarChart3,
ChevronDown,
ChevronUp,
Copy,
Check,
DollarSign,
Clock,
Play,
Pause,
Maximize2,
MessageSquarePlus,
} from 'lucide-react';
const FLAG_STYLES: Record<string, { bg: string; text: string; label: string }> = {
academic: { bg: 'bg-indigo-50', text: 'text-indigo-700', label: 'Academic' },
images: { bg: 'bg-emerald-50', text: 'text-emerald-700', label: 'Images' },
tables: { bg: 'bg-sky-50', text: 'text-sky-700', label: 'Tables' },
equations: { bg: 'bg-violet-50', text: 'text-violet-700', label: 'Equations' },
scanned: { bg: 'bg-amber-50', text: 'text-amber-700', label: 'Scanned' },
};
const LAYOUT_STYLES: Record<string, { bg: string; text: string; label: string }> = {
single_column: { bg: 'bg-slate-100', text: 'text-slate-700', label: 'Single Column' },
double_column: { bg: 'bg-blue-100', text: 'text-blue-800', label: 'Double Column' },
presentation: { bg: 'bg-rose-100', text: 'text-rose-700', label: 'Presentation' },
};
type PageAttrs = {
layout: string;
is_academic: boolean;
has_images: boolean;
has_tables: boolean;
has_equations: boolean;
is_scanned: boolean;
};
function CollapsibleSection({
title,
count,
defaultOpen = true,
children,
}: {
title: string;
count?: number;
defaultOpen?: boolean;
children: React.ReactNode;
}) {
const [open, setOpen] = useState(defaultOpen);
return (
<div className="border-b last:border-b-0">
<button
onClick={() => setOpen(!open)}
className="w-full flex items-center justify-between px-4 py-2.5 hover:bg-gray-50 transition-colors"
>
<h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wide">
{title}{count != null ? ` (${count})` : ''}
</h4>
{open ? (
<ChevronUp className="w-3.5 h-3.5 text-muted-foreground" />
) : (
<ChevronDown className="w-3.5 h-3.5 text-muted-foreground" />
)}
</button>
{open && <div className="px-4 pb-3">{children}</div>}
</div>
);
}
function StructureMetadataPanel({ metadata, onExpand }: { metadata: Record<string, unknown>; onExpand?: () => void }) {
const pageAttributes = (metadata.page_attributes ?? {}) as Record<string, PageAttrs>;
const outline = (metadata.outline ?? []) as Array<{ level: number; text: string; page: number }>;
const footnotes = (metadata.footnotes ?? []) as Array<{
number: string;
body_text: string;
source_page: number;
}>;
const codeBlocks = (metadata.code_blocks ?? []) as Array<{
language: string;
first_line: string;
page: number;
reasoning: string;
}>;
const pages = Object.entries(pageAttributes);
const totalPages = pages.length;
// Compute document-level summary from page attributes
const layouts = new Map<string, number>();
const flagCounts: Record<string, number> = { academic: 0, images: 0, tables: 0, equations: 0, scanned: 0 };
for (const [, attrs] of pages) {
layouts.set(attrs.layout, (layouts.get(attrs.layout) ?? 0) + 1);
if (attrs.is_academic) flagCounts.academic++;
if (attrs.has_images) flagCounts.images++;
if (attrs.has_tables) flagCounts.tables++;
if (attrs.has_equations) flagCounts.equations++;
if (attrs.is_scanned) flagCounts.scanned++;
}
const hasAnyData = totalPages > 0 || outline.length > 0 || footnotes.length > 0 || codeBlocks.length > 0;
return (
<div className="w-72 flex-shrink-0 border-l bg-white flex flex-col overflow-y-auto">
<div className="px-4 py-3 border-b flex items-center justify-between">
<h3 className="text-sm font-semibold text-gray-800">Structure Metadata</h3>
{onExpand && (
<button
onClick={onExpand}
className="p-1 rounded hover:bg-gray-100 transition-colors"
title="Expand to full view"
>
<Maximize2 className="w-3.5 h-3.5 text-muted-foreground" />
</button>
)}
</div>
{/* Document summary */}
{totalPages > 0 && (
<div className="px-4 py-3 border-b bg-gray-50/50">
<h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wide mb-2">
Document Summary
</h4>
{/* Layout distribution */}
<div className="flex flex-wrap gap-1.5 mb-2">
{[...layouts.entries()].map(([layout, count]) => {
const style = LAYOUT_STYLES[layout] ?? { bg: 'bg-gray-100', text: 'text-gray-700', label: layout };
return (
<span
key={layout}
className={cn('px-2 py-1 rounded-md text-[11px] font-medium', style.bg, style.text)}
>
{style.label}
{count < totalPages && (
<span className="ml-1 opacity-60">{count}/{totalPages}</span>
)}
</span>
);
})}
</div>
{/* Flag summary bar */}
<div className="flex flex-wrap gap-1">
{Object.entries(flagCounts)
.filter(([, count]) => count > 0)
.map(([flag, count]) => {
const style = FLAG_STYLES[flag]!;
return (
<span
key={flag}
className={cn('px-1.5 py-0.5 rounded text-[10px] font-medium', style.bg, style.text)}
>
{style.label} {count < totalPages ? `${count}p` : ''}
</span>
);
})}
</div>
</div>
)}
{/* Per-page attributes */}
{totalPages > 0 && (
<CollapsibleSection title="Page Attributes" count={totalPages} defaultOpen={totalPages <= 12}>
<div className="space-y-1.5">
{pages.map(([page, attrs]) => {
const layoutStyle = LAYOUT_STYLES[attrs.layout] ?? { bg: 'bg-gray-100', text: 'text-gray-700', label: attrs.layout };
const activeFlags = [
attrs.is_academic && 'academic',
attrs.has_images && 'images',
attrs.has_tables && 'tables',
attrs.has_equations && 'equations',
attrs.is_scanned && 'scanned',
].filter(Boolean) as string[];
return (
<div key={page} className="flex items-start gap-1.5 text-xs">
<span className="px-1.5 py-0.5 rounded bg-gray-100 text-gray-600 font-mono font-medium shrink-0 w-6 text-center">
{page}
</span>
<div className="flex flex-wrap gap-1 min-w-0">
<span
className={cn('px-1.5 py-0.5 rounded font-medium text-[10px]', layoutStyle.bg, layoutStyle.text)}
>
{layoutStyle.label.toLowerCase().replace(' ', '-')}
</span>
{activeFlags.map((flag) => {
const style = FLAG_STYLES[flag]!;
return (
<span
key={flag}
className={cn('px-1.5 py-0.5 rounded font-medium text-[10px]', style.bg, style.text)}
>
{style.label.toLowerCase()}
</span>
);
})}
</div>
</div>
);
})}
</div>
</CollapsibleSection>
)}
{/* Outline */}
{outline.length > 0 && (
<CollapsibleSection title="Outline" count={outline.length} defaultOpen={outline.length <= 25}>
<div className="space-y-0.5">
{outline.map((entry, idx) => (
<div
key={idx}
className="text-xs text-muted-foreground"
style={{ paddingLeft: `${(entry.level - 1) * 12}px` }}
>
<span className="text-gray-400 mr-1">{'#'.repeat(entry.level)}</span>
<span>{entry.text}</span>
<span className="text-gray-300 ml-1">p{entry.page}</span>
</div>
))}
</div>
</CollapsibleSection>
)}
{/* Code blocks */}
{codeBlocks.length > 0 && (
<CollapsibleSection title="Code Blocks" count={codeBlocks.length}>
<div className="space-y-2">
{codeBlocks.map((cb, idx) => (
<div key={idx} className="text-xs">
<div className="flex items-center gap-1.5 mb-0.5">
<span className="px-1.5 py-0.5 rounded bg-gray-800 text-gray-100 font-mono font-medium text-[10px]">
{cb.language}
</span>
<span className="text-gray-400">p{cb.page}</span>
</div>
<p className="text-muted-foreground line-clamp-1 pl-1 font-mono text-[10px]">{cb.first_line}</p>
</div>
))}
</div>
</CollapsibleSection>
)}
{/* Footnotes */}
{footnotes.length > 0 && (
<CollapsibleSection title="Footnotes" count={footnotes.length}>
<div className="space-y-2">
{footnotes.map((fn, idx) => (
<div key={idx} className="text-xs">
<div className="flex items-center gap-1.5 mb-0.5">
<span className="px-1.5 py-0.5 rounded bg-amber-50 text-amber-700 font-medium">
[{fn.number}]
</span>
<span className="text-gray-400">p{fn.source_page}</span>
</div>
<p className="text-muted-foreground line-clamp-3 pl-1">{fn.body_text}</p>
</div>
))}
</div>
</CollapsibleSection>
)}
{!hasAnyData && (
<div className="flex-1 flex items-center justify-center p-4">
<p className="text-xs text-muted-foreground text-center">
No structural metadata found.
</p>
</div>
)}
</div>
);
}
export function PipelineViewerPage() {
const {
result,
uploading,
error,
processing,
currentStepName,
statusMessage,
processFile,
reset,
sessionId,
piiFindings,
awaitingPiiDecision,
piiDenied,
submitPiiDecision,
} = usePipelineViewer();
const feedbackEnabled = useFeedbackConfig();
const [currentPage, setCurrentPage] = useState(1);
const [activeStepIdx, setActiveStepIdx] = useState(0);
const [copiedImage, setCopiedImage] = useState(false);
const [dragOver, setDragOver] = useState(false);
const [autoAdvance, setAutoAdvance] = useState(true);
const [changesModalOpen, setChangesModalOpen] = useState(false);
const [metadataModalOpen, setMetadataModalOpen] = useState(false);
const [feedbackModalOpen, setFeedbackModalOpen] = useState(false);
const fileInputRef = useRef<HTMLInputElement>(null);
const skipNavRef = useRef<HTMLElement>(null);
const loadingStatusRef = useRef<HTMLDivElement>(null);
const hasClassificationError = !!(
result &&
Object.keys(result.versions).length === 0 &&
result.steps.some((s) => s.name === 'classification' && s.error)
);
// Coarse view state drives the skip-nav targets so screen reader users get
// the right landing spot for whichever screen they're looking at.
const viewState: 'idle' | 'uploading' | 'error' | 'result' = uploading
? 'uploading'
: error || hasClassificationError
? 'error'
: result
? 'result'
: 'idle';
// Single polite live region copy — drives the aria-live announcement.
const liveAnnouncement = useMemo(() => {
if (error) return `Error: ${error}`;
if (uploading && !processing) return 'Uploading document. Extracting content.';
if (processing && currentStepName) return `Processing step: ${currentStepName}.`;
if (processing) return 'Document received. Processing pipeline started.';
if (result && Object.keys(result.versions).length > 0) return 'Processing complete.';
return '';
}, [uploading, processing, currentStepName, error, result]);
// Move focus to the loading status region the moment the upload starts so
// a blind user knows the stream is live and has a live-region neighbour.
useEffect(() => {
if (uploading && loadingStatusRef.current) {
loadingStatusRef.current.focus();
}
}, [uploading]);
// When processing starts, move focus off the (now-unmounted) loading region
// and onto the active stage tab — prefer the one the pipeline flagged as
// currently processing, falling back to the first (Extraction) tab so the
// user has a deterministic anchor before any step has streamed in.
useEffect(() => {
if (!processing) return;
requestAnimationFrame(() => {
const stagesRoot = document.getElementById('region-stages');
if (!stagesRoot) return;
const target =
stagesRoot.querySelector<HTMLButtonElement>('button[aria-current="step"]') ??
stagesRoot.querySelector<HTMLButtonElement>('button:not([disabled])') ??
stagesRoot.querySelector<HTMLButtonElement>('button');
target?.focus();
});
}, [processing]);
// Auto-advance to newest step tab as steps stream in
const stepsLength = result?.steps.length ?? 0;
useEffect(() => {
if (autoAdvance && stepsLength > 0) {
setActiveStepIdx(stepsLength - 1);
}
}, [stepsLength, autoAdvance]);
const totalPages = result?.total_pages ?? 0;
const activeStep = result?.steps[activeStepIdx] ?? null;
const isPiiStepActive = activeStep?.name === 'pii_scan';
const piiPanelState: 'scanning' | 'awaiting' | 'approved' | 'denied' | 'clean' | 'error' | null =
!isPiiStepActive
? null
: awaitingPiiDecision
? 'awaiting'
: piiDenied
? 'denied'
: activeStep?.error
? 'error'
: (piiFindings && piiFindings.length > 0)
? 'approved'
: piiFindings
? 'clean'
: 'scanning';
const stepVersion = activeStep?.version_after ?? 'v0';
const activeVersion = stepVersion;
// Whether this version has per-page markdowns (v0, v1) vs full-document only (v2, v3)
const hasPerPageMarkdown = !!result?.page_markdowns[activeVersion];
// Current page markdown for the active version — fall back to full document for v2/v3
const pageMarkdown = hasPerPageMarkdown
? (result?.page_markdowns[activeVersion]?.[String(currentPage)] ?? '')
: (result?.versions[activeVersion] ?? '');
const pageImage = result?.page_images[String(currentPage)] ?? null;
// Map figure paths to base64 data URIs for inline rendering
const figureMap = useMemo(() => {
if (!result?.figures.length) return {};
const map: Record<string, string> = {};
for (const fig of result.figures) {
if (fig.image_base64) {
map[`figures/${fig.ref_id}.png`] = `data:image/png;base64,${fig.image_base64}`;
}
}
return map;
}, [result?.figures]);
// Aggregate all changes from the active stage (not just the active step)
const stageChanges = useMemo(() => {
if (!result || !activeStep) return [];
const allStages = [...PIPELINE_STAGES, REVIEW_STAGE];
const stage = allStages.find((s) => s.steps.includes(activeStep.name))
?? (PIPELINE_STAGES.every((s) => !s.steps.includes(activeStep.name)) ? REVIEW_STAGE : null);
if (!stage) return activeStep.changes;
return result.steps
.filter((s) => stage.steps.includes(s.name))
.flatMap((s) => s.changes);
}, [result, activeStep]);
/** 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 current page image to clipboard. */
const handleCopyImage = useCallback(async () => {
if (!pageImage) return;
try {
const blob = base64ToBlob(pageImage);
await navigator.clipboard.write([new ClipboardItem({ 'image/png': blob })]);
setCopiedImage(true);
setTimeout(() => setCopiedImage(false), 1500);
} catch {
navigator.clipboard.writeText(`[Page ${currentPage} image — clipboard not supported]`);
setCopiedImage(true);
setTimeout(() => setCopiedImage(false), 1500);
}
}, [pageImage, currentPage, base64ToBlob]);
/**
* Download a zip containing the version's markdown and a `figures/` folder
* of PNGs. Markdown already uses `figures/{ref_id}.png` relative paths, so
* the bundle is self-contained without any path rewriting.
*/
const downloadBundle = useCallback(async (version: string) => {
if (!result?.versions[version]) return;
const baseName = result.filename.replace(/\.pdf$/i, '');
const blob = await buildMarkdownBundle(result, version, baseName);
triggerBlobDownload(blob, `${baseName}-${version}.zip`);
}, [result]);
const handleDownloadVersion = useCallback(
(stepIndex: number) => {
if (!result) return;
const step = result.steps[stepIndex];
if (!step?.version_after) return;
void downloadBundle(step.version_after);
},
[result, downloadBundle],
);
const handleDownloadCurrentMarkdown = useCallback(() => {
void downloadBundle(activeVersion);
}, [activeVersion, downloadBundle]);
const handleProcess = useCallback(
async (file: File) => {
setCurrentPage(1);
setActiveStepIdx(0);
await processFile(file, {
imagesScale: 2.0,
doTableStructure: true,
});
},
[processFile],
);
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);
}
},
[handleProcess],
);
const handleFileSelect = useCallback(
(e: React.ChangeEvent<HTMLInputElement>) => {
const file = e.target.files?.[0];
if (file) handleProcess(file);
},
[handleProcess],
);
// Focus a landmark region by ID with a visible focus ring
const handleFocusRegion = useCallback((region: FocusRegion) => {
if (region === 'skip') {
const firstLink = skipNavRef.current?.querySelector<HTMLAnchorElement>('a');
firstLink?.focus();
return;
}
const idMap = { pages: 'region-pages', stages: 'region-stages', preview: 'region-preview', changes: 'region-changes' };
const el = document.getElementById(idMap[region]);
if (el) {
el.focus();
el.scrollIntoView({ block: 'nearest' });
// Apply a visible focus ring via inline style (Tailwind focus: doesn't reliably work on programmatic focus)
el.style.outline = '2px solid #1e3a5f';
el.style.outlineOffset = '-2px';
const cleanup = () => {
el.style.outline = '';
el.style.outlineOffset = '';
el.removeEventListener('blur', cleanup);
};
el.addEventListener('blur', cleanup);
}
}, []);
return (
<div className="flex flex-col h-screen bg-gray-50">
{/* Skip navigation menu — targets change with view state */}
<nav
ref={skipNavRef}
aria-label="Skip navigation"
className="sr-only focus-within:not-sr-only focus-within:absolute focus-within:z-[60] focus-within:top-0 focus-within:left-0 focus-within:bg-white focus-within:border focus-within:rounded-md focus-within:shadow-lg focus-within:p-3"
>
<ul className="flex flex-col gap-1">
{viewState === 'idle' && (
<li><a href="#region-upload" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to PDF upload</a></li>
)}
{viewState === 'uploading' && (
<li><a href="#region-status" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to processing status</a></li>
)}
{viewState === 'error' && (
<li><a href="#region-error" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to error message</a></li>
)}
{viewState === 'result' && (
<>
<li><a href="#region-preview" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to Rendered Preview</a></li>
<li><a href="#region-stages" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to Stage Picker</a></li>
<li><a href="#region-pages" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to Page Picker</a></li>
<li><a href="#region-changes" className="text-sm text-uic-blue underline focus:outline-2 focus:outline-uic-blue px-2 py-1 block rounded hover:bg-uic-blue/5">Skip to Changes Panel</a></li>
</>
)}
</ul>
</nav>
{/* Polite live region — announces upload / pipeline state transitions
to assistive technology without moving focus. */}
<div className="sr-only" role="status" aria-live="polite" aria-atomic="true">
{liveAnnouncement}
</div>
<KeyboardShortcuts onFocusRegion={handleFocusRegion} />
{/* Header */}
<header aria-labelledby="region-header-heading" className="flex items-center px-6 py-3 bg-white border-b shadow-sm">
<h1 id="region-header-heading" className="text-lg font-bold text-uic-blue flex items-center gap-2">
{import.meta.env.VITE_SHOW_UIC_LOGO === 'true' && (
<img
src="/uic-logo.png"
alt="University of Illinois Chicago"
className="h-7 w-7"
/>
)}
Equalify Reflow
<span
className="text-[10px] font-semibold uppercase tracking-wider bg-uic-blue/10 text-uic-blue border border-uic-blue/20 px-2 py-0.5 rounded-full"
>
Beta
</span>
</h1>
</header>
{/* Classification error — document was rejected before processing */}
{result && Object.keys(result.versions).length === 0 && (() => {
const classStep = result.steps.find((s) => s.name === 'classification' && s.error);
return classStep ? (
<section
id="region-error"
tabIndex={-1}
aria-labelledby="region-error-heading"
className="outline-none"
>
<h2 id="region-error-heading" className="sr-only">Classification error</h2>
<ClassificationError step={classStep} onReset={reset} />
</section>
) : null;
})()}
{/* Pipeline layout — always visible */}
{!(result && Object.keys(result.versions).length === 0 && result.steps.some((s) => s.name === 'classification' && s.error)) && (
<div className="flex-1 flex flex-col min-h-0">
{/* Step tabs */}
<nav id="region-stages" tabIndex={-1} aria-labelledby="region-stages-heading" className="outline-none rounded-sm">
<h2 id="region-stages-heading" className="sr-only">Pipeline stages</h2>
<StageTabs
steps={result?.steps ?? []}
activeStepIdx={activeStepIdx}
onSelectStep={setActiveStepIdx}
processingStepName={processing ? currentStepName : null}
onDownloadVersion={handleDownloadVersion}
onOpenChangesModal={() => setChangesModalOpen(true)}
/>
</nav>
{/* Warnings banner */}
{result?.warnings && result.warnings.length > 0 && (
<WarningsBanner warnings={result.warnings} />
)}
{/* Pre-result states: upload, loading, error */}
{!result && (
<div className="flex-1 flex items-center justify-center p-8">
{uploading ? (
<section
id="region-status"
ref={loadingStatusRef}
tabIndex={-1}
aria-labelledby="region-status-heading"
className="flex flex-col items-center gap-4 outline-none focus:outline-2 focus:outline-uic-blue focus:outline-offset-4 rounded-md"
>
<h2 id="region-status-heading" className="sr-only">Processing status</h2>
<Loader2 className="w-10 h-10 animate-spin text-uic-blue" aria-hidden="true" />
<p className="text-muted-foreground">Extracting document content...</p>
{statusMessage ? (
<div className="bg-amber-50 border border-amber-200 rounded-lg px-4 py-3 max-w-md text-center">
<p className="text-sm text-amber-900">{statusMessage}</p>
</div>
) : (
<p className="text-xs text-muted-foreground">Processing time depends on document length and complexity</p>
)}
</section>
) : error ? (
<section
id="region-error"
tabIndex={-1}
aria-labelledby="region-error-inline-heading"
className="max-w-md text-center outline-none"
>
<h2 id="region-error-inline-heading" className="sr-only">Processing error</h2>
<p className="text-red-700 font-medium mb-2">Processing Error</p>
<p className="text-sm text-muted-foreground mb-4">{error}</p>
<Button variant="outline" onClick={reset}>
Try Again
</Button>
</section>
) : (
<section aria-labelledby="region-upload-heading">
<h2 id="region-upload-heading" className="sr-only">Upload a document</h2>
<button
id="region-upload"
type="button"
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 bg-transparent focus:outline-2 focus:outline-uic-blue focus:outline-offset-2',
dragOver ? 'border-uic-blue bg-uic-blue/5' : 'border-gray-400 hover:border-uic-blue',
)}
onClick={() => fileInputRef.current?.click()}
aria-label="Upload a PDF: press Enter or Space to open a file picker, or drop a file here"
>
<Upload className="w-12 h-12 mx-auto mb-4 text-gray-500" aria-hidden="true" />
<p className="text-lg font-medium text-gray-800 mb-1">
Drop a PDF here or click to upload
</p>
<p className="text-sm text-muted-foreground">
See every processing step in the pipeline above
</p>
<input
ref={fileInputRef}
type="file"
accept=".pdf"
className="hidden"
onChange={handleFileSelect}
/>
</button>
</section>
)}
</div>
)}
{/* Stats bar — only when we have results */}
{result && Object.keys(result.versions).length > 0 && (
<section
aria-labelledby="region-stats-heading"
className="flex items-center gap-6 px-6 py-2 bg-white border-b text-sm"
>
<h2 id="region-stats-heading" className="sr-only">Document stats and controls</h2>
<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>
)}
{(() => {
const totalMs = result.steps.reduce((s, st) => s + (st.elapsed_ms || 0), 0);
const totalSec = totalMs / 1000;
const timeStr = totalSec >= 60
? `${Math.floor(totalSec / 60)}m ${Math.round(totalSec % 60)}s`
: `${totalSec.toFixed(1)}s`;
return totalMs > 0 ? (
<span className="flex items-center gap-1">
<Clock className="w-3.5 h-3.5" />
{timeStr}
</span>
) : null;
})()}
{(() => {
const totalCost = result.steps.reduce((s, st) => s + (st.cost_cents || 0), 0);
const totalTokens = result.steps.reduce((s, st) => s + (st.input_tokens || 0) + (st.output_tokens || 0), 0);
if (totalTokens === 0) return null;
return (
<span className="flex items-center gap-1">
<DollarSign className="w-3.5 h-3.5" />
{(totalCost / 100).toFixed(4)} · {totalTokens.toLocaleString()} tokens
</span>
);
})()}
</div>
<div className="flex-1" />
{/* Feedback — only after pipeline finishes */}
{feedbackEnabled && !processing && (
<Button
variant="outline"
size="sm"
className="h-7 text-xs gap-1.5 text-uic-blue border-uic-blue/30 hover:bg-uic-blue/5"
onClick={() => setFeedbackModalOpen(true)}
title="Report an issue with this conversion"
>
<MessageSquarePlus className="w-3.5 h-3.5" />
Feedback
</Button>
)}
{/* Auto-advance toggle */}
<Button
variant="outline"
size="sm"
className={cn(
'h-7 text-xs gap-1.5',
autoAdvance
? 'text-uic-blue border-uic-blue/30 hover:bg-uic-blue/5'
: 'text-muted-foreground',
)}
onClick={() => setAutoAdvance(!autoAdvance)}
title={autoAdvance ? 'Auto-advance is on — click to pause' : 'Auto-advance is off — click to resume'}
>
{autoAdvance ? <Play className="w-3.5 h-3.5" /> : <Pause className="w-3.5 h-3.5" />}
Auto-advance
</Button>
{/* New upload */}
<Button
variant="outline"
size="sm"
className="h-7 text-xs"
onClick={reset}
>
<Upload className="w-3.5 h-3.5 mr-1" />
New PDF
</Button>
</section>
)}
{/* PII Review inline panel — takes over the main area when the
pii_scan step is active (scanning, awaiting decision, or done). */}
{result && piiPanelState && (
<section
aria-labelledby="region-pii-heading"
className="flex-1 min-h-0 overflow-hidden bg-white"
>
<h2 id="region-pii-heading" className="sr-only">PII review</h2>
<PiiReviewPanel
state={piiPanelState}
findings={piiFindings ?? []}
error={activeStep?.error ?? null}
onDecision={submitPiiDecision}
/>
</section>
)}
{/* Main content area — only when we have results and are not on pii */}
{!piiPanelState && result && Object.keys(result.versions).length > 0 && (
<div className="flex-1 flex min-h-0 overflow-hidden">
{/* Page sidebar */}
{totalPages > 1 && (
<nav id="region-pages" tabIndex={-1} aria-labelledby="region-pages-heading" className="w-16 border-r bg-white overflow-y-auto flex-shrink-0 outline-none rounded-sm">
<h2 id="region-pages-heading" className="sr-only">Page navigation</h2>
{Array.from({ length: totalPages }, (_, i) => i + 1).map((p) => (
<button
key={p}
onClick={() => setCurrentPage(p)}
aria-label={`Page ${p}`}
aria-current={p === currentPage ? 'page' : undefined}
className={cn(
'w-full py-2 text-xs font-medium border-b transition-colors',
p === currentPage
? 'bg-uic-blue/10 text-uic-blue border-l-2 border-l-uic-blue'
: 'text-muted-foreground hover:bg-gray-50',
)}
>
{p}
</button>
))}
</nav>
)}
{/* Split view */}
<PanelGroup orientation="horizontal" className="flex-1 min-w-0 overflow-hidden">
<Panel defaultSize={45} minSize={20}>
<div className="h-full flex flex-col">
{pageImage && (
<div className="flex items-center justify-between px-4 py-2 border-b bg-gray-50">
<span className="text-sm font-medium text-muted-foreground">
Page {currentPage} Image
</span>
<Button
variant="ghost"
size="sm"
onClick={handleCopyImage}
title="Copy page image"
className={cn(
'gap-1.5',
copiedImage
? 'text-green-600 hover:text-green-700 hover:bg-green-50'
: 'text-muted-foreground hover:text-foreground',
)}
>
{copiedImage ? (
<Check className="w-4 h-4" />
) : (
<Copy className="w-4 h-4" />
)}
<span className="text-xs">{copiedImage ? 'Copied' : 'Copy Image'}</span>
</Button>
</div>
)}
<div className="flex-1 overflow-auto bg-gray-100 flex items-start justify-center p-4">
{pageImage ? (
<img
src={`data:image/png;base64,${pageImage}`}
alt={`Page ${currentPage}`}
className="max-w-full shadow-lg rounded"
/>
) : processing || uploading ? (
<div className="flex flex-col items-center gap-2 mt-20 text-muted-foreground">
<Loader2 className="w-6 h-6 animate-spin" />
<span className="text-sm">Loading page image...</span>
</div>
) : (
<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" />
<Panel defaultSize={55} minSize={20}>
<main id="region-preview" tabIndex={-1} aria-labelledby="region-preview-heading" className="h-full outline-none rounded-sm">
<h2 id="region-preview-heading" className="sr-only">Document preview</h2>
<MarkdownViewer
content={pageMarkdown}
figureMap={figureMap}
isComplete={true}
onDownloadMarkdown={handleDownloadCurrentMarkdown}
onCopy={() => {
navigator.clipboard.writeText(pageMarkdown);
}}
/>
</main>
</Panel>
</PanelGroup>
{/* Right sidebar */}
<aside id="region-changes" tabIndex={-1} aria-labelledby="region-changes-heading" className="flex-shrink-0 outline-none rounded-sm">
<h2 id="region-changes-heading" className="sr-only">Changes and metadata</h2>
{activeStep?.name === 'structure' && activeStep.metadata ? (
<StructureMetadataPanel metadata={activeStep.metadata} onExpand={() => setMetadataModalOpen(true)} />
) : (
<div className="w-64 flex-shrink-0 border-l bg-white flex flex-col">
<div className="px-4 py-3 border-b">
<h3 className="text-sm font-medium text-muted-foreground">Changes</h3>
</div>
{stageChanges.length === 0 ? (
<div className="flex-1 flex items-center justify-center p-4">
<p className="text-xs text-muted-foreground text-center">
No changes in this stage.
<br />
Docling produces v0 from scratch.
</p>
</div>
) : (
<div className="flex-1 flex flex-col items-center justify-center p-4 gap-3">
<span className="text-2xl font-bold text-amber-700">{stageChanges.length}</span>
<p className="text-xs text-muted-foreground text-center">
change{stageChanges.length !== 1 ? 's' : ''} in this stage
</p>
<Button
variant="outline"
size="sm"
className="text-xs gap-1.5"
onClick={() => setChangesModalOpen(true)}
>
<Maximize2 className="w-3.5 h-3.5" />
View Details
</Button>
</div>
)}
</div>
)}
</aside>
</div>
)}
</div>
)}
{/* Modals */}
{changesModalOpen && (
<ChangesModal
changes={stageChanges}
totalPages={totalPages}
onClose={() => setChangesModalOpen(false)}
/>
)}
{metadataModalOpen && activeStep?.metadata && (
<StructureMetadataModal
metadata={activeStep.metadata}
onClose={() => setMetadataModalOpen(false)}
/>
)}
{feedbackModalOpen && (
<FeedbackModal
onClose={() => setFeedbackModalOpen(false)}
sessionId={sessionId ?? null}
documentTitle={result?.filename ?? null}
currentPage={currentPage}
currentStage={activeStep?.display_name ?? null}
/>
)}
</div>
);
}