rasgapdf 0.3.3

Blazing-fast spatial 2D PDF parser in pure Rust with multi-language bindings (Python, Node.js, Go, C#) for RAG, LLMs, bounding boxes, and table extraction
Documentation 
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  <title>⚡ RasgaPDF — Blazing-Fast 2D Spatial PDF Parser in Rust (Python, Node.js, Go, C#)</title>
  <meta name="description" content="RasgaPDF is an ultra-fast 2D Spatial PDF Parser powered by pure Rust (~3-8 ms/page). Extract exact [x0, y0, x1, y1] bounding boxes, text blocks, tables, embedded images, and vector paths for Spatial RAG, LLMs, Python, Node.js, Rust, Go, and C#.">
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  <meta name="author" content="Messias Martins">
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    <section style="padding:2rem;background:#0f172a;color:#f8fafc;font-family:sans-serif;">
      <h1>RasgaPDF — The Blazing-Fast 2D Spatial PDF Parser in Pure Rust</h1>
      <p>Extract exact physical coordinates <code>[x0, y0, x1, y1]</code>, structured text blocks, matrix tables, embedded images, and vector paths at ~3–8 ms per page.</p>
      <ul>
        <li><strong>Python (PyPI):</strong> <code>pip install rasgapdf</code> — <a href="https://pypi.org/project/rasgapdf/">pypi.org/project/rasgapdf</a></li>
        <li><strong>Node.js (npm):</strong> <code>npm install rasgapdf</code> — <a href="https://www.npmjs.com/package/rasgapdf">npmjs.com/package/rasgapdf</a></li>
        <li><strong>Rust (Crates.io):</strong> <code>cargo add rasgapdf</code> — <a href="https://crates.io/crates/rasgapdf">crates.io/crates/rasgapdf</a></li>
        <li><strong>GitHub Repository:</strong> <a href="https://github.com/MartinsMessias/rasgapdf">github.com/MartinsMessias/rasgapdf</a></li>
        <li><strong>LLM Documentation:</strong> <a href="llms.txt">llms.txt</a> | <a href="llms-full.txt">llms-full.txt</a></li>
      </ul>
    </section>
  </noscript>

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        <span class="text-xl sm:text-2xl font-black bg-gradient-to-r from-cyan-400 to-blue-500 bg-clip-text text-transparent">⚡ RasgaPDF</span>
        <span class="text-xs px-2.5 py-0.5 rounded-full bg-cyan-950 text-cyan-400 border border-cyan-800 font-mono font-bold">v0.3.3</span>
        <span id="headerComputeBadge" class="hidden sm:inline-block text-xs px-2.5 py-0.5 rounded-full bg-emerald-950 text-emerald-400 border border-emerald-800 font-mono">Client-Side Compute</span>
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        <!-- Duplicate Space Button -->
        <a href="https://huggingface.co/spaces/martinsmessias/rasgapdf?duplicate=true" target="_blank" class="flex items-center gap-1.5 bg-gradient-to-r from-amber-500 to-orange-500 hover:from-amber-600 hover:to-orange-600 text-slate-950 font-bold px-3 py-1.5 rounded-lg text-xs shadow transition">
          <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path></svg>
          <span class="hidden xs:inline">Duplicate to Your HF Account</span>
          <span class="xs:hidden">Duplicate</span>
        </a>

        <!-- Repository & Package Links -->
        <a href="https://github.com/MartinsMessias/rasgapdf" target="_blank" class="bg-slate-800 hover:bg-slate-700 text-slate-200 border border-slate-700 px-2.5 py-1.5 rounded-lg text-xs font-mono transition flex items-center gap-1">
          <svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24"><path fill-rule="evenodd" clip-rule="evenodd" d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.53 1.032 1.53 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z"></path></svg>
          GitHub
        </a>
        <a href="https://pypi.org/project/rasgapdf/" target="_blank" class="bg-slate-800 hover:bg-slate-700 text-blue-400 border border-slate-700 px-2.5 py-1.5 rounded-lg text-xs font-mono transition">PyPI</a>
        <a href="https://crates.io/crates/rasgapdf" target="_blank" class="bg-slate-800 hover:bg-slate-700 text-orange-400 border border-slate-700 px-2.5 py-1.5 rounded-lg text-xs font-mono transition">Crates</a>
        <a href="https://www.npmjs.com/package/rasgapdf" target="_blank" class="bg-slate-800 hover:bg-slate-700 text-red-400 border border-slate-700 px-2.5 py-1.5 rounded-lg text-xs font-mono transition">npm</a>
        <a href="https://huggingface.co/martinsmessias/rasgapdf" target="_blank" class="bg-slate-800 hover:bg-slate-700 text-cyan-400 border border-slate-700 px-2.5 py-1.5 rounded-lg text-xs font-mono transition">HF Hub</a>
      </div>
    </div>
  </header>

  <!-- Main Viewport-Filling Workspace -->
  <main class="flex-1 w-full p-3 sm:p-5 flex flex-col lg:flex-row gap-4 min-h-0 overflow-y-auto lg:overflow-hidden">

    <!-- Left Controls Sidebar (Compact on mobile, fixed width on desktop) -->
    <aside class="w-full lg:w-80 xl:w-96 flex flex-col gap-3 shrink-0 overflow-y-visible lg:overflow-y-auto pr-0 lg:pr-1">
      
      <!-- File Upload Card -->
      <div class="bg-slate-900 border border-slate-800 rounded-xl p-4 shadow-lg">
        <label class="block text-xs font-semibold text-slate-200 mb-2">📄 Select or Upload PDF</label>
        <div id="dropzone" role="button" tabindex="0" aria-label="Upload PDF document" class="border-2 border-dashed border-slate-700 hover:border-cyan-500 rounded-lg p-4 sm:p-5 text-center cursor-pointer transition bg-slate-950/50">
          <svg class="mx-auto h-7 w-7 text-cyan-400 mb-1.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12"></path></svg>
          <p class="text-xs text-slate-300 font-medium">Click to upload or drag & drop</p>
          <p class="text-[10px] text-slate-500 mt-0.5">Processed 100% locally in your browser</p>
          <input type="file" id="pdfFileInput" accept="application/pdf" class="hidden">
        </div>

        <button id="btnLoadSample" class="mt-2.5 w-full py-1.5 bg-slate-800 hover:bg-slate-700 border border-slate-700 rounded-lg text-xs font-medium text-cyan-300 transition flex items-center justify-center gap-1.5">
          <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path></svg>
          Load Built-in Sample PDF
        </button>
      </div>

      <!-- Navigation & Controls -->
      <div class="bg-slate-900 border border-slate-800 rounded-xl p-4 shadow-lg flex flex-col gap-3">
        <div class="flex items-center justify-between">
          <span class="text-xs font-semibold text-slate-200">📖 Page Navigation</span>
          <span id="pageIndicator" class="text-xs font-mono text-cyan-400">Page 1 of 1</span>
        </div>

        <div class="flex items-center gap-2">
          <button id="btnPrevPage" class="flex-1 py-1.5 bg-slate-800 hover:bg-slate-700 border border-slate-700 rounded-lg text-xs font-semibold disabled:opacity-50 transition">Previous</button>
          <input type="range" id="pageSlider" min="1" max="1" value="1" class="flex-1 accent-cyan-400 cursor-pointer">
          <button id="btnNextPage" class="flex-1 py-1.5 bg-slate-800 hover:bg-slate-700 border border-slate-700 rounded-lg text-xs font-semibold disabled:opacity-50 transition">Next</button>
        </div>

        <div class="border-t border-slate-800/80 pt-2.5 flex flex-col gap-2">
          <label class="flex items-center gap-2 text-xs text-slate-300 cursor-pointer">
            <input type="checkbox" id="chkShowBoxes" checked class="rounded accent-cyan-400">
            <span>Show 2D Bounding Boxes (Translucent Cyan)</span>
          </label>
          <label class="flex items-center gap-2 text-xs text-slate-300 cursor-pointer">
            <input type="checkbox" id="chkShowImages" checked class="rounded accent-orange-400">
            <span>Show Embedded Images (Translucent Orange)</span>
          </label>
          <label class="flex items-center gap-2 text-xs text-slate-300 cursor-pointer">
            <input type="checkbox" id="chkShowVectors" checked class="rounded accent-fuchsia-400">
            <span>Show Vector Paths (Translucent Magenta)</span>
          </label>
        </div>
      </div>

      <!-- Performance Metrics Card -->
      <div class="bg-slate-900 border border-slate-800 rounded-xl p-4 shadow-lg">
        <span class="text-[11px] font-semibold text-slate-400 uppercase tracking-wider block mb-2.5">⚡ Extraction Metrics</span>
        <div class="grid grid-cols-2 gap-2 text-xs">
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Parse Latency</span>
            <span id="metricLatency" class="font-mono text-cyan-400 font-bold text-xs">0.00 ms</span>
          </div>
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Total Spans</span>
            <span id="metricSpans" class="font-mono text-cyan-400 font-bold text-xs">0</span>
          </div>
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Embedded Images</span>
            <span id="metricImages" class="font-mono text-orange-400 font-bold text-xs">0</span>
          </div>
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Vector Paths</span>
            <span id="metricVectors" class="font-mono text-fuchsia-400 font-bold text-xs">0</span>
          </div>
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Canvas Dimensions</span>
            <span id="metricDims" class="font-mono text-slate-300 text-[11px]">-</span>
          </div>
          <div class="bg-slate-950 p-2 rounded-lg border border-slate-800/80">
            <span class="text-slate-500 block text-[10px]">Compute Mode</span>
            <span id="metricComputeMode" class="font-mono text-amber-400 font-bold text-[11px]">Client Browser</span>
          </div>
        </div>
      </div>
    </aside>

    <!-- Right Workspace Area (Full Width & Height) -->
    <section class="flex-1 h-full min-h-[550px] lg:min-h-0 flex flex-col gap-3 overflow-hidden">

      <!-- Navigation Tabs -->
      <div class="flex border-b border-slate-800 gap-1 overflow-x-auto pb-1 text-xs font-semibold shrink-0">
        <button data-tab="tab-visual" class="tab-btn px-4 py-2 border-b-2 border-cyan-400 text-cyan-300 font-bold flex items-center gap-1.5 transition">
          👁️ 1. 2D Canvas Overlay
        </button>
        <button data-tab="tab-coords" class="tab-btn px-4 py-2 border-b-2 border-transparent text-slate-400 hover:text-slate-200 flex items-center gap-1.5 transition">
          ⚡ 2. Raw Coordinates (X/Y Table)
        </button>
        <button data-tab="tab-text" class="tab-btn px-4 py-2 border-b-2 border-transparent text-slate-400 hover:text-slate-200 flex items-center gap-1.5 transition">
          📝 3. Pure Plain Text
        </button>
        <button data-tab="tab-json" class="tab-btn px-4 py-2 border-b-2 border-transparent text-slate-400 hover:text-slate-200 flex items-center gap-1.5 transition">
          📄 4. Raw JSON Export
        </button>
        <button data-tab="tab-images" class="tab-btn px-4 py-2 border-b-2 border-transparent text-slate-400 hover:text-slate-200 flex items-center gap-1.5 transition">
          🖼️ 5. Embedded Images
        </button>
      </div>

      <!-- Tab Content 1: 2D Visual Overlay (Primary Tab, Full Height & Width) -->
      <div id="tab-visual" class="tab-panel flex flex-col bg-slate-900 border border-slate-800 rounded-xl overflow-hidden shadow-lg flex-1 h-full min-h-0">
        <div class="p-2.5 sm:p-3 bg-slate-950 border-b border-slate-800 flex flex-wrap justify-between items-center gap-2 text-xs shrink-0">
          <div class="flex items-center gap-2 min-w-0">
            <span class="font-semibold text-slate-200 whitespace-nowrap">Rendered Canvas Overlay</span>
          </div>
          <!-- Responsive Zoom Controls -->
          <div class="flex items-center gap-1 shrink-0">
            <span class="text-slate-400 text-[11px] mr-1 hidden sm:inline">Zoom:</span>
            <button id="btnFitPage" class="px-2 py-0.5 rounded bg-cyan-950 text-cyan-400 border border-cyan-800 text-[11px] font-mono hover:bg-cyan-900 transition font-bold" title="Fit entire page vertically and horizontally">🔍 Fit Page</button>
            <button id="btnFitWidth" class="px-2 py-0.5 rounded bg-slate-800 text-slate-300 border border-slate-700 text-[11px] font-mono hover:bg-slate-700 transition" title="Fit page width to screen">↔️ Fit Width</button>
            <button id="btnZoom100" class="px-2 py-0.5 rounded bg-slate-800 text-slate-300 border border-slate-700 text-[11px] font-mono hover:bg-slate-700 transition">100%</button>
            <button id="btnZoom150" class="px-2 py-0.5 rounded bg-slate-800 text-slate-300 border border-slate-700 text-[11px] font-mono hover:bg-slate-700 transition">150%</button>
          </div>
        </div>

        <!-- Canvas Scroll Area: Starts from Top (y=0), Full Screen Scrollable -->
        <div id="canvasScrollArea" class="flex-1 w-full h-full min-h-0 overflow-auto p-4 sm:p-6 bg-slate-950/80">
          <div id="canvasWrapper" class="shadow-2xl border border-slate-700/80 rounded bg-white transition-all mx-auto w-max">
            <canvas id="pdfCanvas" class="block cursor-crosshair"></canvas>
          </div>
        </div>
      </div>

      <!-- Tab Content 2: Raw Coordinates Table -->
      <div id="tab-coords" class="tab-panel hidden flex flex-col bg-slate-900 border border-slate-800 rounded-xl overflow-hidden shadow-lg flex-1 h-full min-h-0">
        <div class="p-3 bg-slate-950 border-b border-slate-800 flex justify-between items-center text-xs shrink-0">
          <span class="font-semibold text-slate-300">Exact Physical Coordinates Matrix</span>
          <span id="tableCount" class="text-slate-500 font-mono">0 spans displayed</span>
        </div>
        <div class="flex-1 overflow-auto w-full">
          <table class="w-full text-left text-xs border-collapse">
            <thead class="bg-slate-950 sticky top-0 border-b border-slate-800 text-cyan-400 font-mono font-bold">
              <tr>
                <th class="p-3 w-16 text-center">Page</th>
                <th class="p-3 w-20">X0 (pt)</th>
                <th class="p-3 w-20">Y0 (pt)</th>
                <th class="p-3 w-20">X1 (pt)</th>
                <th class="p-3 w-20">Y1 (pt)</th>
                <th class="p-3 w-16">Size</th>
                <th class="p-3 w-28">Font</th>
                <th class="p-3 min-w-[280px]">Extracted Text</th>
              </tr>
            </thead>
            <tbody id="coordsTableBody" class="divide-y divide-slate-800/60 font-sans">
              <tr>
                <td colspan="8" class="p-8 text-center text-slate-500">No PDF loaded. Please upload a file or click "Load Built-in Sample PDF".</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>

      <!-- Tab Content 3: Pure Plain Text -->
      <div id="tab-text" class="tab-panel hidden flex flex-col bg-slate-900 border border-slate-800 rounded-xl overflow-hidden shadow-lg flex-1 h-full min-h-0">
        <div class="p-3 bg-slate-950 border-b border-slate-800 flex justify-between items-center text-xs shrink-0">
          <span class="font-semibold text-slate-300">Pure Text Stream & Raw Coordinates Dump</span>
          <button id="btnCopyText" class="px-3 py-1 bg-cyan-950 hover:bg-cyan-900 text-cyan-300 border border-cyan-800 rounded text-xs font-semibold flex items-center gap-1 transition">
            📋 Copy to Clipboard
          </button>
        </div>
        <textarea id="pureTextBox" readonly class="flex-1 w-full h-full bg-slate-950 p-4 text-xs font-mono text-slate-200 outline-none resize-none leading-relaxed" placeholder="Text stream will appear here..."></textarea>
      </div>

      <!-- Tab Content 4: JSON Export -->
      <div id="tab-json" class="tab-panel hidden flex flex-col bg-slate-900 border border-slate-800 rounded-xl overflow-hidden shadow-lg flex-1 h-full min-h-0">
        <div class="p-3 bg-slate-950 border-b border-slate-800 flex flex-wrap justify-between items-center gap-2 text-xs shrink-0">
          <div class="flex items-center gap-2">
            <span class="font-semibold text-slate-300">JSON Inspection:</span>
            <div class="inline-flex rounded-lg bg-slate-900 p-0.5 border border-slate-800">
              <button id="btnJsonStructured" class="px-2.5 py-1 rounded text-xs font-medium bg-cyan-950 text-cyan-300 border border-cyan-800 transition">Structured Layout</button>
              <button id="btnJsonRaw" class="px-2.5 py-1 rounded text-xs font-medium text-slate-400 hover:text-slate-200 transition">Raw X/Y Spans</button>
            </div>
          </div>
          <div class="flex items-center gap-2">
            <button id="btnCopyJson" class="px-3 py-1 bg-slate-800 hover:bg-slate-700 text-slate-200 border border-slate-700 rounded text-xs font-semibold flex items-center gap-1 transition">
              📋 Copy JSON
            </button>
            <button id="btnDownloadJson" class="px-3 py-1 bg-cyan-950 hover:bg-cyan-900 text-cyan-300 border border-cyan-800 rounded text-xs font-semibold flex items-center gap-1 transition">
              💾 Download JSON
            </button>
          </div>
        </div>
        <pre id="jsonViewer" class="flex-1 w-full h-full bg-slate-950 p-4 text-xs font-mono text-cyan-300 overflow-auto"></pre>
      </div>

      <!-- Tab Content 5: Embedded Images -->
      <div id="tab-images" class="tab-panel hidden flex flex-col bg-slate-900 border border-slate-800 rounded-xl overflow-hidden shadow-lg flex-1 h-full min-h-0">
        <div class="p-3 bg-slate-950 border-b border-slate-800 flex flex-wrap justify-between items-center gap-2 text-xs shrink-0">
          <span class="font-semibold text-slate-300">Embedded Images (decoded client-side from the content stream)</span>
          <span id="imagesCount" class="text-slate-500 font-mono">0 images on page 1</span>
        </div>
        <div id="imagesGrid" class="flex-1 overflow-auto w-full p-3 grid grid-cols-1 sm:grid-cols-2 xl:grid-cols-3 gap-3 content-start">
          <div class="col-span-full p-8 text-center text-slate-500 text-xs">No PDF loaded. Please upload a file or click "Load Built-in Sample PDF".</div>
        </div>
      </div>

    </section>
  </main>

  <!-- Floating hover tooltip: follows the cursor over the overlay canvas -->
  <div id="hoverInfo" class="hidden fixed z-40 pointer-events-none font-mono text-[11px] leading-snug text-cyan-200 bg-slate-950/95 px-2.5 py-1.5 rounded border border-cyan-700 shadow-xl truncate max-w-[420px]"></div>

  <!-- File load error toast: without it a rejected PDF fails silently -->
  <div id="loadError" class="hidden fixed bottom-6 left-1/2 -translate-x-1/2 z-50 w-[92%] sm:w-auto sm:max-w-lg bg-rose-950/95 border border-rose-700 text-rose-100 rounded-xl px-4 py-3 shadow-2xl">
    <div class="flex items-start gap-3">
      <span class="text-base leading-none mt-0.5">⚠️</span>
      <div class="min-w-0 flex-1">
        <p id="loadErrorTitle" class="text-sm font-bold text-rose-200">Could not open this PDF</p>
        <p id="loadErrorMessage" class="text-xs text-rose-200/80 mt-1 break-words"></p>
      </div>
      <button id="loadErrorClose" class="shrink-0 text-rose-300/70 hover:text-white text-sm leading-none px-1" title="Dismiss">✕</button>
    </div>
  </div>

  <!-- Embedded image lightbox -->
  <div id="imageLightbox" class="fixed inset-0 z-50 bg-slate-950/90 items-center justify-center p-6" style="display: none;">
    <div class="bg-slate-900 border border-slate-700 rounded-xl shadow-2xl flex flex-col max-w-full max-h-full overflow-hidden">
      <div class="flex items-start justify-between gap-6 px-4 py-2.5 bg-slate-950 border-b border-slate-800">
        <div class="flex flex-col min-w-0">
          <span id="lightboxTitle" class="text-sm font-bold text-orange-400 font-mono truncate">-</span>
          <span id="lightboxMeta" class="text-[11px] text-slate-400 font-mono truncate">-</span>
        </div>
        <button id="lightboxClose" class="shrink-0 text-slate-400 hover:text-slate-100 text-base leading-none px-2 py-1 rounded hover:bg-slate-800 transition" title="Close (Esc)">✕</button>
      </div>
      <div class="overflow-auto bg-slate-950 flex items-center justify-center p-4">
        <canvas id="lightboxCanvas" class="shadow-lg"></canvas>
      </div>
      <div class="px-4 py-2 bg-slate-950 border-t border-slate-800 text-[11px] text-slate-400 font-mono flex items-center justify-between gap-4">
        <span id="lightboxSize">-</span>
        <span class="text-slate-600">Esc to close · scroll to pan</span>
      </div>
    </div>
  </div>

  <!-- Script logic with PDF.js client-side parser -->
  <script>
    pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';

    let currentPdfDoc = null;
    let currentPageNum = 1;
    let extractedSpans = [];
    let extractedImages = [];
    let extractedDrawings = [];
    let currentRenderScale = 1.0;
    let activeZoomMode = 'fit-page'; // 'fit-page' | 'fit-width' | 'manual'
    let currentViewport = null;
    let cleanPdfBitmap = null;
    let hoveredSpan = null;
    let hoveredImage = null;
    let hoveredDrawing = null;

    // Document-wide extraction cache. Each entry mirrors the Rust JSON schema
    // (coordinates in PDF points, top-down) so the visualizer can rebuild any
    // page from it and export a `pages[]` document exactly like the native engine.
    let pageCache = [];
    let docModel = null;
    let docFileName = 'document.pdf';
    let docParseMs = 0;
    let docParseStart = 0;
    let parseGeneration = 0;

    // Elements
    const fileInput = document.getElementById('pdfFileInput');
    const dropzone = document.getElementById('dropzone');
    const btnLoadSample = document.getElementById('btnLoadSample');
    const pageSlider = document.getElementById('pageSlider');
    const pageIndicator = document.getElementById('pageIndicator');
    const btnPrevPage = document.getElementById('btnPrevPage');
    const btnNextPage = document.getElementById('btnNextPage');
    const chkShowBoxes = document.getElementById('chkShowBoxes');
    const chkShowImages = document.getElementById('chkShowImages');
    const chkShowVectors = document.getElementById('chkShowVectors');
    const coordsTableBody = document.getElementById('coordsTableBody');
    const tableCount = document.getElementById('tableCount');
    const pureTextBox = document.getElementById('pureTextBox');
    const btnCopyText = document.getElementById('btnCopyText');
    const btnDownloadJson = document.getElementById('btnDownloadJson');
    const btnCopyJson = document.getElementById('btnCopyJson');
    const jsonViewer = document.getElementById('jsonViewer');
    const imagesGrid = document.getElementById('imagesGrid');
    const imagesCount = document.getElementById('imagesCount');
    const imageLightbox = document.getElementById('imageLightbox');
    const lightboxCanvas = document.getElementById('lightboxCanvas');
    const lightboxTitle = document.getElementById('lightboxTitle');
    const lightboxMeta = document.getElementById('lightboxMeta');
    const lightboxSize = document.getElementById('lightboxSize');
    const lightboxClose = document.getElementById('lightboxClose');
    const metricLatency = document.getElementById('metricLatency');
    const metricSpans = document.getElementById('metricSpans');
    const metricImages = document.getElementById('metricImages');
    const metricVectors = document.getElementById('metricVectors');
    const metricComputeMode = document.getElementById('metricComputeMode');
    const headerComputeBadge = document.getElementById('headerComputeBadge');
    let currentRustDoc = null;
    const loadError = document.getElementById('loadError');
    const loadErrorTitle = document.getElementById('loadErrorTitle');
    const loadErrorMessage = document.getElementById('loadErrorMessage');
    const loadErrorClose = document.getElementById('loadErrorClose');
    const metricDims = document.getElementById('metricDims');
    const hoverInfo = document.getElementById('hoverInfo');
    const canvasScrollArea = document.getElementById('canvasScrollArea');

    const btnFitPage = document.getElementById('btnFitPage');
    const btnFitWidth = document.getElementById('btnFitWidth');
    const btnZoom100 = document.getElementById('btnZoom100');
    const btnZoom150 = document.getElementById('btnZoom150');

    const pdfCanvas = document.getElementById('pdfCanvas');
    const pdfCtx = pdfCanvas.getContext('2d');

    // Tabs logic
    document.querySelectorAll('.tab-btn').forEach(btn => {
      btn.addEventListener('click', () => {
        document.querySelectorAll('.tab-btn').forEach(b => {
          b.classList.remove('border-cyan-400', 'text-cyan-300', 'font-bold');
          b.classList.add('border-transparent', 'text-slate-400');
        });
        btn.classList.add('border-cyan-400', 'text-cyan-300', 'font-bold');
        btn.classList.remove('border-transparent', 'text-slate-400');

        document.querySelectorAll('.tab-panel').forEach(p => p.classList.add('hidden'));
        const targetPanel = document.getElementById(btn.dataset.tab);
        targetPanel.classList.remove('hidden');

        // If switching to visual tab, guarantee instant repaint
        if (btn.dataset.tab === 'tab-visual') {
          if (cleanPdfBitmap) {
            drawCanvas(null);
          } else if (currentPdfDoc) {
            renderCurrentPage();
          }
        }
      });
    });

    // Zoom Buttons Styling
    function updateZoomButtons() {
      [btnFitPage, btnFitWidth, btnZoom100, btnZoom150].forEach(b => {
        b.className = 'px-2 py-0.5 rounded bg-slate-800 text-slate-300 border border-slate-700 text-[11px] font-mono hover:bg-slate-700 transition';
      });

      if (activeZoomMode === 'fit-page') {
        btnFitPage.className = 'px-2 py-0.5 rounded bg-cyan-950 text-cyan-400 border border-cyan-800 text-[11px] font-mono hover:bg-cyan-900 transition font-bold';
      } else if (activeZoomMode === 'fit-width') {
        btnFitWidth.className = 'px-2 py-0.5 rounded bg-cyan-950 text-cyan-400 border border-cyan-800 text-[11px] font-mono hover:bg-cyan-900 transition font-bold';
      } else if (currentRenderScale === 1.0) {
        btnZoom100.className = 'px-2 py-0.5 rounded bg-cyan-950 text-cyan-400 border border-cyan-800 text-[11px] font-mono hover:bg-cyan-900 transition font-bold';
      } else if (currentRenderScale === 1.5) {
        btnZoom150.className = 'px-2 py-0.5 rounded bg-cyan-950 text-cyan-400 border border-cyan-800 text-[11px] font-mono hover:bg-cyan-900 transition font-bold';
      }
    }

    async function calculateAutoZoom(mode = activeZoomMode) {
      if (!currentPdfDoc) return 1.0;
      const page = await currentPdfDoc.getPage(currentPageNum);
      const vp1 = page.getViewport({ scale: 1.0 });

      // Available container space
      const availW = Math.max(canvasScrollArea.clientWidth - 52, 280);
      const availH = Math.max(canvasScrollArea.clientHeight - 52, 320);

      if (mode === 'fit-page') {
        // Fits both width and height cleanly without clipping
        const scaleW = availW / vp1.width;
        const scaleH = availH / vp1.height;
        return Math.min(scaleW, scaleH);
      } else if (mode === 'fit-width') {
        // Fits width of available area
        return availW / vp1.width;
      }
      return currentRenderScale;
    }

    btnFitPage.addEventListener('click', async () => {
      activeZoomMode = 'fit-page';
      currentRenderScale = await calculateAutoZoom('fit-page');
      updateZoomButtons();
      renderCurrentPage();
    });

    btnFitWidth.addEventListener('click', async () => {
      activeZoomMode = 'fit-width';
      currentRenderScale = await calculateAutoZoom('fit-width');
      updateZoomButtons();
      renderCurrentPage();
    });

    btnZoom100.addEventListener('click', () => {
      activeZoomMode = 'manual';
      currentRenderScale = 1.0;
      updateZoomButtons();
      renderCurrentPage();
    });

    btnZoom150.addEventListener('click', () => {
      activeZoomMode = 'manual';
      currentRenderScale = 1.5;
      updateZoomButtons();
      renderCurrentPage();
    });

    // Window Resize Observer for Responsive Fit
    let resizeTimer = null;
    window.addEventListener('resize', () => {
      clearTimeout(resizeTimer);
      resizeTimer = setTimeout(async () => {
        if (currentPdfDoc && (activeZoomMode === 'fit-page' || activeZoomMode === 'fit-width')) {
          currentRenderScale = await calculateAutoZoom(activeZoomMode);
          renderCurrentPage();
        }
      }, 200);
    });

    // File selection
    dropzone.addEventListener('click', () => fileInput.click());
    dropzone.addEventListener('dragover', (e) => { e.preventDefault(); dropzone.classList.add('border-cyan-400'); });
    dropzone.addEventListener('dragleave', () => dropzone.classList.remove('border-cyan-400'));
    dropzone.addEventListener('drop', (e) => {
      e.preventDefault();
      dropzone.classList.remove('border-cyan-400');
      if (e.dataTransfer.files.length > 0) loadPdfFile(e.dataTransfer.files[0]);
    });
    fileInput.addEventListener('change', (e) => {
      if (e.target.files.length > 0) loadPdfFile(e.target.files[0]);
    });

    btnLoadSample.addEventListener('click', async () => {
      try {
        const res = await fetch('sample.pdf');
        const blob = await res.blob();
        loadPdfFile(blob, 'sample.pdf');
      } catch (e) {
        alert('Could not load sample.pdf: ' + e);
      }
    });

    function showLoadError(err, fileName) {
      const name = (err && err.name) || '';
      const msg = (err && err.message) || String(err || 'Unknown error');

      let title = 'Could not open this PDF';
      let text = msg;

      if (name === 'PasswordException' || /password/i.test(msg)) {
        title = 'Password-protected PDF';
        text = 'This file is encrypted with a password. Remove the password (or export an unprotected copy) and try again.';
      } else if (/encryption|EBX_HANDLER|ADEPT|encrypted/i.test(msg)) {
        title = 'This PDF is DRM-protected';
        text = "It uses Adobe ADEPT / EBX_HANDLER encryption (typical of e-books). The content is locked by the store's key, so no PDF library can read it without removing the DRM. Try an unprotected copy.";
      } else if (name === 'InvalidPDFException' || /invalid pdf/i.test(msg)) {
        title = 'This file is not a valid PDF';
        text = 'The file looks corrupted or is not a PDF at all. Try re-exporting it.';
      }

      if (fileName) text = fileName + ' — ' + text;

      loadErrorTitle.textContent = title;
      loadErrorMessage.textContent = text;
      loadError.classList.remove('hidden');
      console.error('loadPdfFile failed:', err);
    }

    loadErrorClose.addEventListener('click', () => loadError.classList.add('hidden'));

    
    // Load WebAssembly Pure Rust Engine (rasgapdf.wasm)
    let wasmEngine = null;
    async function initWasmEngine() {
      try {
        const wasmRes = await fetch('rasgapdf.wasm');
        if (wasmRes.ok) {
          const wasmBytes = await wasmRes.arrayBuffer();
          const { instance } = await WebAssembly.instantiate(wasmBytes);
          wasmEngine = instance.exports;
          console.log('⚡ Pure Rust WebAssembly Engine initialized successfully!');
        }
      } catch (err) {
        console.warn('WASM engine unavailable, using browser fallback:', err);
      }
    }
    const wasmEnginePromise = initWasmEngine();

    function parsePdfWithWasm(pdfUint8Array) {
      if (!wasmEngine) return null;
      const t0 = performance.now();
      const ptr = wasmEngine.wasm_alloc(pdfUint8Array.length);
      const mem = new Uint8Array(wasmEngine.memory.buffer);
      mem.set(pdfUint8Array, ptr);

      // Pass parser options with extract_images and extract_drawings enabled
      const optsJson = JSON.stringify({
        detect_tables: true,
        extract_images: true,
        extract_drawings: true,
        filter_background_fills: true
      });
      const optsBytes = new TextEncoder().encode(optsJson + "\0");
      const optsPtr = wasmEngine.wasm_alloc(optsBytes.length);
      const memOpts = new Uint8Array(wasmEngine.memory.buffer);
      memOpts.set(optsBytes, optsPtr);

      // Parse structured document (blocks, tables, images, and drawings)
      const resPtr = wasmEngine.rasgapdf_parse_bytes_options
        ? wasmEngine.rasgapdf_parse_bytes_options(ptr, pdfUint8Array.length, optsPtr)
        : wasmEngine.rasgapdf_parse_bytes(ptr, pdfUint8Array.length);

      const memOut = new Uint8Array(wasmEngine.memory.buffer);
      let end = resPtr;
      while (memOut[end] !== 0) end++;
      const jsonStr = new TextDecoder('utf-8').decode(memOut.subarray(resPtr, end));
      const structured = JSON.parse(jsonStr);

      // Parse raw spans for highlighting
      const rawPtr = wasmEngine.rasgapdf_parse_raw_bytes(ptr, pdfUint8Array.length);
      const memRaw = new Uint8Array(wasmEngine.memory.buffer);
      let endRaw = rawPtr;
      while (memRaw[endRaw] !== 0) endRaw++;
      const rawJsonStr = new TextDecoder('utf-8').decode(memRaw.subarray(rawPtr, endRaw));
      const raw = JSON.parse(rawJsonStr);

      const elapsed = (performance.now() - t0).toFixed(2);

      wasmEngine.rasgapdf_free_string(resPtr);
      wasmEngine.rasgapdf_free_string(rawPtr);
      wasmEngine.wasm_free(optsPtr, optsBytes.length);
      wasmEngine.wasm_free(ptr, pdfUint8Array.length);

      return {
        structured: structured,
        raw: raw,
        parse_time_ms: elapsed,
        is_wasm: true
      };
    }


async function loadPdfFile(file, name = null) {
      const fileName = name || file.name || 'document.pdf';

      try {
        loadError.classList.add('hidden');

        const rawBytes = new Uint8Array(await file.arrayBuffer());
        // Always pass a fresh slice/copy so the buffer is never detached
        const wasmBytes = rawBytes.slice();
        const pdfJsBytes = rawBytes.slice();

        // 1. Prioritize Pure Rust WebAssembly in the browser!
        currentRustDoc = null;
        if (wasmEngine) {
          try {
            currentRustDoc = parsePdfWithWasm(wasmBytes);
            console.log('⚡ Parsed with Pure Rust WebAssembly Engine in', currentRustDoc.parse_time_ms, 'ms');
          } catch (wErr) {
            console.warn('WASM parse error:', wErr);
          }
        }

        const loadingTask = pdfjsLib.getDocument({ data: pdfJsBytes });
        currentPdfDoc = await loadingTask.promise;

        if (!currentRustDoc) {
          try {
            const formData = new FormData();
            formData.append('file', file, fileName);
            const apiRes = await fetch('/api/parse', { method: 'POST', body: formData });
            if (apiRes.ok) {
              currentRustDoc = await apiRes.json();
              console.log('⚡ Parsed with Native Rust Server in', currentRustDoc.parse_time_ms, 'ms');
            }
          } catch (e) {
            console.log('Native server not reachable');
          }
        }

        pageSlider.max = currentPdfDoc.numPages;
        pageSlider.value = 1;
        currentPageNum = 1;
        docFileName = fileName;

        // Reset the document model for the new file.
        parseGeneration += 1;
        pageCache = new Array(currentPdfDoc.numPages);
        docModel = null;
        docParseMs = 0;

        // On mobile devices, default to fit-width; on desktop, default to fit-page
        if (window.innerWidth < 768) {
          activeZoomMode = 'fit-width';
        } else {
          activeZoomMode = 'fit-page';
        }

        if (!currentRustDoc) {
          throw new Error('Pure Rust WebAssembly engine not loaded.');
        }

        currentRenderScale = await calculateAutoZoom(activeZoomMode);
        updateZoomButtons();
        await renderCurrentPage();
      } catch (e) {
        showLoadError(e, fileName);
      }
    }

    let renderInFlight = false;
    let renderQueued = false;

    async function renderCurrentPage() {
      if (!currentPdfDoc) return;

      // Serialize renders: pdf.js refuses two render() calls on the same canvas,
      // and zoom / resize / page-change events can fire while a page is still
      // painting. Without this the later call dies silently and leaves the
      // extracted arrays empty.
      if (renderInFlight) {
        renderQueued = true;
        return;
      }

      renderInFlight = true;
      try {
        do {
          renderQueued = false;
          await renderPageOnce();
        } while (renderQueued && currentPdfDoc);
      } finally {
        renderInFlight = false;
      }
    }

    async function renderPageOnce() {
      if (!currentPdfDoc) return;

      const t0 = performance.now();
      pageIndicator.textContent = `Page ${currentPageNum} of ${currentPdfDoc.numPages}`;
      pageSlider.value = currentPageNum;
      btnPrevPage.disabled = (currentPageNum <= 1);
      btnNextPage.disabled = (currentPageNum >= currentPdfDoc.numPages);

      const page = await currentPdfDoc.getPage(currentPageNum);
      const viewport = page.getViewport({ scale: currentRenderScale });
      currentViewport = viewport;

      pdfCanvas.width = viewport.width;
      pdfCanvas.height = viewport.height;

      metricDims.textContent = `${Math.round(viewport.width / currentRenderScale)}x${Math.round(viewport.height / currentRenderScale)} pt`;

      // 1. Render base PDF page directly onto canvas
      await page.render({ canvasContext: pdfCtx, viewport }).promise;

      // 2. Cache clean rasterized bitmap of PDF for zero-latency redrawing
      cleanPdfBitmap = await createImageBitmap(pdfCanvas);

      // If Native Rust Engine processed this document, use its 100% native Rust data!
      if (currentRustDoc && currentRustDoc.structured && currentRustDoc.structured.pages) {
        const pageData = currentRustDoc.structured.pages[currentPageNum - 1] || {};

        // 1. Spans from Rust
        const pageSpans = (currentRustDoc.raw && currentRustDoc.raw.spans
          ? currentRustDoc.raw.spans.filter(s => s.page === currentPageNum)
          : []);

        extractedSpans = pageSpans.map(s => {
          const vx0 = s.x0 * currentRenderScale;
          const vy0 = s.y0 * currentRenderScale;
          const vx1 = s.x1 * currentRenderScale;
          const vy1 = s.y1 * currentRenderScale;
          return {
            page: s.page,
            x0: s.x0,
            y0: s.y0,
            x1: s.x1,
            y1: s.y1,
            font_size: s.font_size,
            font_name: s.font_name || 'Helvetica',
            text: s.text,
            vx0,
            vy0,
            vw: Math.max(vx1 - vx0, 1.0),
            vh: Math.max(vy1 - vy0, 1.0)
          };
        });

        // 2. Images from Rust
        extractedImages = (pageData.images || []).map(im => {
          const b = im.bbox || { x0: 0, y0: 0, x1: 0, y1: 0, width: 0, height: 0 };
          const vx = b.x0 * currentRenderScale;
          const vy = b.y0 * currentRenderScale;
          const vw = b.width * currentRenderScale;
          const vh = b.height * currentRenderScale;
          let thumb = null;
          const uriKey = im.xref ? `xref_${im.xref}` : `${currentPageNum}_${im.image_id}`;
          const uri = currentRustDoc.image_data_uris
            ? (currentRustDoc.image_data_uris[uriKey] || currentRustDoc.image_data_uris[im.image_id] || currentRustDoc.image_data_uris[String(im.image_id)])
            : null;
          if (uri) {
            thumb = new Image();
            thumb.src = uri;
          } else if (b.width > 0 && b.height > 0) {
            thumb = cropFromPage({ vx, vy, vw, vh });
          }
          return {
            objId: im.name || '#' + im.image_id,
            px: { width: im.pixel_width, height: im.pixel_height },
            pt: { x0: b.x0, y0: b.y0, x1: b.x1, y1: b.y1 },
            paint: { vx, vy, vw, vh },
            count: 1,
            thumb: thumb,
            cropped: !uri,
            mime: im.mime_type,
            sha256: im.sha256
          };
        });

        // 3. Vector drawings from Rust
        extractedDrawings = (pageData.drawings || []).map(d => {
          const b = d.bbox || { x0: 0, y0: 0, x1: 0, y1: 0, width: 0, height: 0 };
          const vx = b.x0 * currentRenderScale;
          const vy = b.y0 * currentRenderScale;
          const vw = Math.max(b.width * currentRenderScale, 1.0);
          const vh = Math.max(b.height * currentRenderScale, 1.0);
          return {
            type: d.drawing_type,
            fill: rgb01ToHex(d.fill_color),
            stroke: rgb01ToHex(d.stroke_color),
            paint: { vx, vy, vw, vh },
            pt: { x0: b.x0, y0: b.y0, x1: b.x1, y1: b.y1 }
          };
        });

        // 4. Update metrics with real Rust values
        const rustLatency = (currentRustDoc.parse_time_ms !== undefined)
          ? Number(currentRustDoc.parse_time_ms).toFixed(2)
          : (performance.now() - t0).toFixed(2);
        metricLatency.textContent = `${rustLatency} ms`;
        metricSpans.textContent = extractedSpans.length;
        metricImages.textContent = extractedImages.length;
        metricVectors.textContent = extractedDrawings.length;
        const isWasm = currentRustDoc && currentRustDoc.is_wasm;
        const modeTitle = isWasm ? 'Pure Rust WebAssembly (WASM)' : 'Native Rust Engine (FFI)';
        if (metricComputeMode) {
          metricComputeMode.textContent = modeTitle;
          metricComputeMode.className = 'font-mono text-emerald-400 font-bold text-[11px]';
        }
        if (headerComputeBadge) {
          headerComputeBadge.textContent = isWasm ? '⚡ Rust WebAssembly Engine' : '⚡ Native Rust Engine';
          headerComputeBadge.className = 'hidden sm:inline-block text-xs px-2.5 py-0.5 rounded-full bg-emerald-950 text-emerald-300 border border-emerald-700 font-mono font-bold';
        }

        updateTable();
        updateTextDump();
        updateImageGallery();
        drawCanvas(null);
        updateJsonViewer();
        return;
      }

      // If not from Rust, clear elements
      extractedSpans = [];
      extractedImages = [];
      extractedDrawings = [];
      updateTable();
      updateTextDump();
      updateImageGallery();
      drawCanvas(null);
      updateJsonViewer();
    }

    function cropFromPage(paint) {
      if (!cleanPdfBitmap) return null;
      try {
        const x = Math.max(0, Math.round(paint.vx));
        const y = Math.max(0, Math.round(paint.vy));
        const w = Math.max(1, Math.round(paint.vw));
        const h = Math.max(1, Math.round(paint.vh));
        const c = document.createElement('canvas');
        c.width = w;
        c.height = h;
        c.getContext('2d').drawImage(cleanPdfBitmap, x, y, w, h, 0, 0, w, h);
        return c;
      } catch (e) {
        return null;
      }
    }

    function rgb01ToHex(rgb) {
      if (!rgb || rgb.length < 3) return null;
      const to = (v) => Math.max(0, Math.min(255, Math.round(v * 255))).toString(16).padStart(2, '0');
      return '#' + to(rgb[0]) + to(rgb[1]) + to(rgb[2]);
    }

    function updateImageGallery() {
      imagesGrid.innerHTML = '';
      imagesCount.textContent = `${extractedImages.length} image(s) on page ${currentPageNum}`;

      if (extractedImages.length === 0) {
        imagesGrid.innerHTML = '<div class="col-span-full p-8 text-center text-slate-500 text-xs">No embedded images found on this page.</div>';
        return;
      }

      extractedImages.forEach((im, idx) => {
        const card = document.createElement('div');
        card.className = 'bg-slate-950 border border-slate-800 rounded-lg overflow-hidden flex flex-col cursor-pointer group hover:border-orange-500/70 transition focus:outline-none focus:ring-2 focus:ring-orange-500/60';
        card.title = 'Click to view full size';
        card.setAttribute('role', 'button');
        card.setAttribute('tabindex', '0');
        card.setAttribute('aria-label',
          'Enlarge image ' + (idx + 1) +
          (im.px ? ', ' + im.px.width + ' by ' + im.px.height + ' pixels' : ''));
        card.addEventListener('click', () => openLightbox(im, idx));
        card.addEventListener('keydown', (e) => {
          if (e.key === 'Enter' || e.key === ' ') {
            e.preventDefault();
            openLightbox(im, idx);
          }
        });

        const frame = document.createElement('div');
        frame.className = 'relative bg-slate-900/60 flex items-center justify-center p-2 h-44';
        if (im.thumb) {
          im.thumb.className = 'max-h-full max-w-full object-contain shadow';
          frame.appendChild(im.thumb);
        } else {
          frame.innerHTML = '<span class="text-slate-500 text-xs">preview unavailable</span>';
        }

        const hint = document.createElement('span');
        hint.className = 'absolute bottom-1.5 right-2 text-[10px] font-mono text-slate-300 bg-slate-950/85 border border-slate-700 rounded px-1.5 py-0.5 opacity-0 group-hover:opacity-100 transition';
        hint.textContent = '🔍 enlarge';
        frame.appendChild(hint);

        const label = im.objId !== null && im.objId !== undefined
          ? 'XObject ' + im.objId
          : 'inline image';

        const meta = document.createElement('div');
        meta.className = 'p-2.5 text-[11px] font-mono text-slate-300 flex flex-col gap-1 border-t border-slate-800';
        meta.innerHTML =
          '<span class="text-orange-400 font-bold">#' + (idx + 1) + ' ' + escapeHtml(String(label)) + '</span>' +
          '<span>pixels: <span class="coord-font">' + (im.px ? im.px.width + ' x ' + im.px.height : 'unknown') + '</span></span>' +
          '<span>bbox pt: <span class="coord-font">[' + im.pt.x0 + ', ' + im.pt.y0 + ', ' + im.pt.x1 + ', ' + im.pt.y1 + ']</span></span>' +
          '<span>painted: <span class="coord-font">' + im.count + 'x</span>' +
          (im.cropped ? ' <span class="text-amber-400">(crop fallback)</span>' : '') + '</span>' +
          '<span class="text-slate-500">🔍 click to enlarge</span>';

        card.appendChild(frame);
        card.appendChild(meta);
        imagesGrid.appendChild(card);
      });
    }

    function drawCanvas(highlightSpan = null) {
      if (!cleanPdfBitmap) return;

      // Draw clean base PDF
      pdfCtx.drawImage(cleanPdfBitmap, 0, 0);

      // Embedded image placement (orange); the hovered image gets a stronger tint
      if (chkShowImages.checked) {
        extractedImages.forEach(im => {
          const isHovered = (im === hoveredImage);
          pdfCtx.fillStyle = isHovered ? 'rgba(249, 115, 22, 0.40)' : 'rgba(249, 115, 22, 0.22)';
          pdfCtx.strokeStyle = isHovered ? 'rgba(251, 146, 60, 1.0)' : 'rgba(249, 115, 22, 0.95)';
          pdfCtx.lineWidth = isHovered
            ? Math.max(2.5, 3.2 * (currentRenderScale / 1.5))
            : Math.max(1.5, 2.0 * (currentRenderScale / 1.5));
          pdfCtx.fillRect(im.paint.vx, im.paint.vy, im.paint.vw, im.paint.vh);
          pdfCtx.strokeRect(im.paint.vx, im.paint.vy, im.paint.vw, im.paint.vh);
        });
      }

      // Vector paths (magenta); the hovered path gets a stronger stroke
      if (chkShowVectors.checked) {
        extractedDrawings.forEach(d => {
          const isHovered = (d === hoveredDrawing);
          const px = d.paint;

          if (px.vw > 1.5 && px.vh > 1.5) {
            pdfCtx.fillStyle = isHovered ? 'rgba(217, 70, 239, 0.24)' : 'rgba(217, 70, 239, 0.10)';
            pdfCtx.fillRect(px.vx, px.vy, px.vw, px.vh);
          }

          pdfCtx.strokeStyle = isHovered ? 'rgba(240, 171, 252, 1.0)' : 'rgba(217, 70, 239, 0.85)';
          pdfCtx.lineWidth = isHovered
            ? Math.max(2.0, 2.6 * (currentRenderScale / 1.5))
            : Math.max(1.0, 1.2 * (currentRenderScale / 1.5));
          pdfCtx.strokeRect(px.vx, px.vy, px.vw, px.vh);
        });
      }

      if (!chkShowBoxes.checked) return;

      extractedSpans.forEach(s => {
        const isHovered = (s === highlightSpan);

        if (isHovered) {
          pdfCtx.fillStyle = 'rgba(6, 182, 212, 0.40)';
          pdfCtx.strokeStyle = 'rgba(34, 211, 238, 1.0)';
          pdfCtx.lineWidth = Math.max(1.5, 2.0 * (currentRenderScale / 1.5));
        } else {
          pdfCtx.fillStyle = 'rgba(6, 182, 212, 0.18)';
          pdfCtx.strokeStyle = 'rgba(6, 182, 212, 0.85)';
          pdfCtx.lineWidth = Math.max(1.0, 1.3 * (currentRenderScale / 1.5));
        }

        pdfCtx.fillRect(s.vx0, s.vy0, s.vw, s.vh);
        pdfCtx.strokeRect(s.vx0, s.vy0, s.vw, s.vh);
      });
    }

    // Interactive Hover on Canvas (text spans + embedded images).
    // The tooltip is position:fixed and follows the cursor.
    const TOOLTIP_MARGIN = 8;
    const TOOLTIP_OFFSET = 14;

    function positionTooltip(clientX, clientY) {
      const box = hoverInfo.getBoundingClientRect();
      let x = clientX + TOOLTIP_OFFSET;
      let y = clientY + TOOLTIP_OFFSET;

      if (x + box.width + TOOLTIP_MARGIN > window.innerWidth) {
        x = clientX - TOOLTIP_OFFSET - box.width;
      }
      if (y + box.height + TOOLTIP_MARGIN > window.innerHeight) {
        y = clientY - TOOLTIP_OFFSET - box.height;
      }

      hoverInfo.style.left = Math.max(TOOLTIP_MARGIN, Math.round(x)) + 'px';
      hoverInfo.style.top = Math.max(TOOLTIP_MARGIN, Math.round(y)) + 'px';
    }

    function setTooltipKind(kind) {
      hoverInfo.classList.remove(
        'text-cyan-200', 'border-cyan-700',
        'text-orange-200', 'border-orange-700',
        'text-fuchsia-200', 'border-fuchsia-700'
      );
      if (kind === 'image') {
        hoverInfo.classList.add('text-orange-200', 'border-orange-700');
      } else if (kind === 'vector') {
        hoverInfo.classList.add('text-fuchsia-200', 'border-fuchsia-700');
      } else {
        hoverInfo.classList.add('text-cyan-200', 'border-cyan-700');
      }
    }

    function drawingTooltipText(d) {
      const col = d.type === 'stroke' ? d.stroke : (d.fill || d.stroke);
      return 'path · ' + d.type +
        (col ? ' · ' + col : '') +
        ' · bbox [' + d.pt.x0 + ', ' + d.pt.y0 + ', ' + d.pt.x1 + ', ' + d.pt.y1 + ']';
    }

    function imageTooltipText(im) {
      const label = (im.objId !== null && im.objId !== undefined) ? 'XObject ' + im.objId : 'inline image';
      const px = im.px ? (im.px.width + '×' + im.px.height + ' px') : 'unknown size';
      return label + ' · ' + px +
        ' · bbox [' + im.pt.x0 + ', ' + im.pt.y0 + ', ' + im.pt.x1 + ', ' + im.pt.y1 + ']' +
        ' · painted ' + im.count + 'x';
    }

    pdfCanvas.addEventListener('mousemove', (e) => {
      if (!currentViewport) return;

      const rect = pdfCanvas.getBoundingClientRect();
      const scaleX = pdfCanvas.width / rect.width;
      const scaleY = pdfCanvas.height / rect.height;
      const mouseX = (e.clientX - rect.left) * scaleX;
      const mouseY = (e.clientY - rect.top) * scaleY;

      // Text spans are the smaller targets, so they win when they overlap an image.
      const span = extractedSpans.find(s =>
        mouseX >= s.vx0 && mouseX <= s.vx0 + s.vw &&
        mouseY >= s.vy0 && mouseY <= s.vy0 + s.vh
      ) || null;

      const img = (span || !chkShowImages.checked) ? null : (extractedImages.find(im =>
        mouseX >= im.paint.vx && mouseX <= im.paint.vx + im.paint.vw &&
        mouseY >= im.paint.vy && mouseY <= im.paint.vy + im.paint.vh
      ) || null);

      // Smallest matching path wins: the table's outer rect would otherwise
      // swallow its own grid lines, which are far more useful to inspect.
      const drw = (span || img || !chkShowVectors.checked) ? null : (() => {
        let best = null;
        let bestArea = Infinity;
        for (const d of extractedDrawings) {
          const p = d.paint;
          if (mouseX < p.vx || mouseX > p.vx + p.vw || mouseY < p.vy || mouseY > p.vy + p.vh) continue;
          const area = p.vw * p.vh;
          if (area < bestArea) {
            bestArea = area;
            best = d;
          }
        }
        return best;
      })();

      if (span !== hoveredSpan || img !== hoveredImage || drw !== hoveredDrawing) {
        hoveredSpan = span;
        hoveredImage = img;
        hoveredDrawing = drw;
        drawCanvas(hoveredSpan);

        if (hoveredSpan) {
          setTooltipKind('text');
          hoverInfo.textContent = `[${hoveredSpan.x0.toFixed(1)}, ${hoveredSpan.y0.toFixed(1)}, ${hoveredSpan.x1.toFixed(1)}, ${hoveredSpan.y1.toFixed(1)}] "${hoveredSpan.text}"`;
          hoverInfo.classList.remove('hidden');
        } else if (hoveredImage) {
          setTooltipKind('image');
          hoverInfo.textContent = imageTooltipText(hoveredImage);
          hoverInfo.classList.remove('hidden');
        } else if (hoveredDrawing) {
          setTooltipKind('vector');
          hoverInfo.textContent = drawingTooltipText(hoveredDrawing);
          hoverInfo.classList.remove('hidden');
        } else {
          hoverInfo.classList.add('hidden');
        }
      }

      if (hoveredSpan || hoveredImage || hoveredDrawing) positionTooltip(e.clientX, e.clientY);
    });

    pdfCanvas.addEventListener('mouseleave', () => {
      if (hoveredSpan || hoveredImage || hoveredDrawing) {
        hoveredSpan = null;
        hoveredImage = null;
        hoveredDrawing = null;
        drawCanvas(null);
        hoverInfo.classList.add('hidden');
      }
    });

    function updateTable() {
      coordsTableBody.innerHTML = '';
      tableCount.textContent = `${extractedSpans.length} spans on page ${currentPageNum}`;

      if (extractedSpans.length === 0) {
        coordsTableBody.innerHTML = '<tr><td colspan="8" class="p-8 text-center text-slate-500">No text elements found on this page.</td></tr>';
        return;
      }

      extractedSpans.forEach(s => {
        const tr = document.createElement('tr');
        tr.className = 'hover:bg-slate-800/40 transition border-b border-slate-800/40';
        tr.innerHTML = `
          <td class="p-3 text-center text-slate-400 font-mono">${s.page}</td>
          <td class="p-3 coord-font">${s.x0.toFixed(2)}</td>
          <td class="p-3 coord-font">${s.y0.toFixed(2)}</td>
          <td class="p-3 coord-font">${s.x1.toFixed(2)}</td>
          <td class="p-3 coord-font">${s.y1.toFixed(2)}</td>
          <td class="p-3 coord-font">${s.font_size}</td>
          <td class="p-3 text-slate-400 font-mono text-[11px]">${s.font_name}</td>
          <td class="p-3 text-slate-200">${escapeHtml(s.text)}</td>
        `;
        coordsTableBody.appendChild(tr);
      });
    }

    function updateTextDump() {
      let flow = `=== [CLEAN TEXT FLOW] ===\n\n`;
      extractedSpans.forEach(s => flow += s.text + '\n');

      flow += `\n=======================================================\n`;
      flow += `=== [RAW PHYSICAL COORDINATES DUMP] ===\n\n`;
      extractedSpans.forEach(s => {
        flow += `[Page ${s.page}] (X0: ${s.x0.toFixed(2).padStart(7)}, Y0: ${s.y0.toFixed(2).padStart(7)}, X1: ${s.x1.toFixed(2).padStart(7)}, Y1: ${s.y1.toFixed(2).padStart(7)}) [${s.font_size}pt] "${s.text}"\n`;
      });

      pureTextBox.value = flow;
    }

    let currentJsonViewMode = 'structured'; // 'structured' | 'raw'
    const btnJsonStructured = document.getElementById('btnJsonStructured');
    const btnJsonRaw = document.getElementById('btnJsonRaw');

    if (btnJsonStructured && btnJsonRaw) {
      btnJsonStructured.addEventListener('click', () => {
        currentJsonViewMode = 'structured';
        btnJsonStructured.className = 'px-2.5 py-1 rounded text-xs font-medium bg-cyan-950 text-cyan-300 border border-cyan-800 transition';
        btnJsonRaw.className = 'px-2.5 py-1 rounded text-xs font-medium text-slate-400 hover:text-slate-200 transition';
        updateJsonViewer();
      });
      btnJsonRaw.addEventListener('click', () => {
        currentJsonViewMode = 'raw';
        btnJsonRaw.className = 'px-2.5 py-1 rounded text-xs font-medium bg-cyan-950 text-cyan-300 border border-cyan-800 transition';
        btnJsonStructured.className = 'px-2.5 py-1 rounded text-xs font-medium text-slate-400 hover:text-slate-200 transition';
        updateJsonViewer();
      });
    }

    function updateJsonViewer() {
      if (!currentRustDoc) {
        jsonViewer.textContent = '{}';
        return;
      }
      if (currentJsonViewMode === 'raw' && currentRustDoc.raw) {
        jsonViewer.textContent = JSON.stringify(currentRustDoc.raw, null, 2);
      } else {
        jsonViewer.textContent = JSON.stringify(currentRustDoc.structured || {}, null, 2);
      }
    }

    function escapeHtml(text) {
      const div = document.createElement('div');
      div.textContent = text;
      return div.innerHTML;
    }

    // ---------------------------------------------------------------------------
    // Embedded image lightbox (click a gallery thumbnail to inspect it 1:1)
    // ---------------------------------------------------------------------------
    function openLightbox(im, index) {
      if (!im || !im.thumb) return;

      const imgW = im.thumb.naturalWidth || im.thumb.width || (im.px ? im.px.width : 300);
      const imgH = im.thumb.naturalHeight || im.thumb.height || (im.px ? im.px.height : 200);

      lightboxCanvas.width = imgW;
      lightboxCanvas.height = imgH;
      const lctx = lightboxCanvas.getContext('2d');
      lctx.clearRect(0, 0, lightboxCanvas.width, lightboxCanvas.height);
      lctx.drawImage(im.thumb, 0, 0, imgW, imgH);

      const label = (im.objId !== null && im.objId !== undefined) ? 'XObject ' + im.objId : 'inline image';
      lightboxTitle.textContent = '#' + (index + 1) + '  ' + label;
      lightboxMeta.textContent =
        'bbox pt [' + im.pt.x0 + ', ' + im.pt.y0 + ', ' + im.pt.x1 + ', ' + im.pt.y1 + ']' +
        ' · painted ' + im.count + 'x' +
        (im.cropped ? ' · crop fallback' : '');
      lightboxSize.textContent = im.px
        ? (im.px.width + ' x ' + im.px.height + ' px')
        : (imgW + ' x ' + imgH + ' px');

      // Enlarge small images so the embedded pixels are actually visible.
      const maxW = Math.max(window.innerWidth * 0.85, 320);
      const maxH = Math.max(window.innerHeight * 0.72, 240);
      const k = Math.min(maxW / imgW, maxH / imgH);
      const scale = k >= 1 ? Math.min(k, 8) : 1;

      lightboxCanvas.style.width = Math.round(imgW * scale) + 'px';
      lightboxCanvas.style.height = Math.round(imgH * scale) + 'px';
      lightboxCanvas.style.imageRendering = scale >= 2 ? 'pixelated' : 'auto';

      imageLightbox.style.display = 'flex';
    }

    function closeLightbox() {
      imageLightbox.style.display = 'none';
    }

    lightboxClose.addEventListener('click', closeLightbox);
    imageLightbox.addEventListener('click', (e) => {
      if (e.target === imageLightbox) closeLightbox();
    });
    document.addEventListener('keydown', (e) => {
      if (e.key === 'Escape' && imageLightbox.style.display !== 'none') closeLightbox();
    });

    // Navigation Controls
    btnPrevPage.addEventListener('click', () => { if (currentPageNum > 1) { currentPageNum--; renderCurrentPage(); } });
    btnNextPage.addEventListener('click', () => { if (currentPdfDoc && currentPageNum < currentPdfDoc.numPages) { currentPageNum++; renderCurrentPage(); } });
    pageSlider.addEventListener('input', (e) => { currentPageNum = parseInt(e.target.value); renderCurrentPage(); });
    chkShowBoxes.addEventListener('change', () => {
      drawCanvas(hoveredSpan);
    });
    chkShowImages.addEventListener('change', () => {
      drawCanvas(hoveredSpan);
    });
    chkShowVectors.addEventListener('change', () => {
      drawCanvas(hoveredSpan);
    });

    btnCopyText.addEventListener('click', () => {
      navigator.clipboard.writeText(pureTextBox.value);
      btnCopyText.textContent = '✅ Copied!';
      setTimeout(() => btnCopyText.textContent = '📋 Copy to Clipboard', 2000);
    });

    btnDownloadJson.addEventListener('click', async () => {
      const original = btnDownloadJson.textContent;
      btnDownloadJson.textContent = '⏳ Preparing…';
      btnDownloadJson.disabled = true;
      // 100% Rust WASM doc already parsed
      btnDownloadJson.textContent = original;
      btnDownloadJson.disabled = false;

      const blob = new Blob([jsonViewer.textContent], { type: 'application/json' });
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = 'rasgapdf_document.json';
      a.click();
      URL.revokeObjectURL(url);
    });

    if (btnCopyJson) {
      btnCopyJson.addEventListener('click', async () => {
        btnCopyJson.textContent = '⏳ Preparing…';
        btnCopyJson.disabled = true;
        // 100% Rust WASM doc already parsed
        btnCopyJson.disabled = false;

        const text = jsonViewer.textContent || '';
        try {
          await navigator.clipboard.writeText(text);
        } catch (e) {
          // Clipboard API needs a secure context (https/localhost); fall back to a
          // hidden textarea so the button still works on plain http.
          const ta = document.createElement('textarea');
          ta.value = text;
          ta.style.position = 'fixed';
          ta.style.opacity = '0';
          document.body.appendChild(ta);
          ta.select();
          try { document.execCommand('copy'); } catch (err) { /* ignore */ }
          document.body.removeChild(ta);
        }
        btnCopyJson.textContent = '✅ Copied!';
        setTimeout(() => btnCopyJson.textContent = '📋 Copy JSON', 2000);
      });
    }

    // Auto-load sample PDF on startup after WASM is ready
    window.addEventListener('DOMContentLoaded', async () => {
      if (typeof wasmEnginePromise !== 'undefined') {
        await wasmEnginePromise;
      }
      btnLoadSample.click();
    });
  </script>
</body>
</html>