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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Healthcare Document Classifier</title>

    <!-- Tailwind CSS -->
    <script src="https://cdn.tailwindcss.com"></script>

    <!-- Lucide Icons -->
    <script src="https://unpkg.com/lucide@latest"></script>

    <!-- PDF.js: renders PDFs to canvas (works inside sandboxed iframes) -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>

    <!-- Google Fonts: Inter -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">

    <script>
        tailwind.config = {
            theme: {
                extend: {
                    fontFamily: {
                        sans: ['Inter', 'sans-serif'],
                    },
                    colors: {
                        primary: {
                            50: '#f0fdf4',
                            100: '#dcfce7',
                            500: '#22c55e',
                            600: '#16a34a',
                            700: '#15803d',
                        }
                    }
                }
            }
        }
    </script>
    <style>
        /* Custom Scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #f1f5f9;
        }
        ::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #94a3b8;
        }

        .drag-active {
            border-color: #22c55e !important;
            background-color: #f0fdf4 !important;
        }

        #preview-container {
            position: absolute;
            inset: 0;
            z-index: 5;
            background: #e2e8f0;
        }

        #preview-container img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        #preview-container iframe {
            width: 100%;
            height: 100%;
            border: none;
            border-radius: 0.5rem;
        }
    </style>
</head>
<body class="bg-slate-50 text-slate-800 h-screen flex flex-col font-sans overflow-hidden">

    <!-- Header -->
    <header class="bg-white border-b border-slate-200 px-6 py-4 flex items-center justify-between shrink-0 z-10 shadow-sm">
        <div class="flex items-center gap-3">
            <div class="bg-primary-100 p-2 rounded-lg text-primary-600">
                <i data-lucide="file-check-2" class="w-6 h-6"></i>
            </div>
            <div>
                <h1 class="font-semibold text-lg leading-tight">Med Doc Classifier</h1>
                <p class="text-xs text-slate-500">Advanced Classification Module</p>
            </div>
        </div>
        <div class="flex items-center gap-4">
            <div class="flex items-center gap-2 text-sm text-slate-600 bg-slate-100 px-3 py-1.5 rounded-md border border-slate-200">
                <i data-lucide="server" class="w-4 h-4"></i>
                <input type="text" id="api-url" value="https://78c9-103-64-129-250.ngrok-free.app/classifier/api/v1" class="bg-transparent border-none outline-none w-48 text-slate-700 font-mono text-xs" title="API Base URL">
            </div>
            <div class="flex items-center gap-2 text-sm text-slate-600 bg-slate-100 px-3 py-1.5 rounded-md border border-slate-200">
                <i data-lucide="key-round" class="w-4 h-4"></i>
                <input type="password" id="api-key" value="dc_aa4bc757ae2869a9bdd91b316b8cf748a86a3bf66e6954b854c185ae12cad4e2" class="bg-transparent border-none outline-none w-40 text-slate-700 font-mono text-xs" title="API Key (masked)">
            </div>
            <label class="flex items-center gap-2 cursor-pointer text-sm">
                <input type="checkbox" id="mock-mode" class="rounded text-primary-600 focus:ring-primary-500" checked>
                <span class="text-slate-600">Test Mode (Mock API)</span>
            </label>
        </div>
    </header>

    <!-- Navigation Tabs -->
    <div class="bg-white border-b border-slate-200 px-6 flex items-center gap-2 shrink-0">
        <button id="tab-single" onclick="setAppMode('single')" class="px-4 py-3 text-sm font-semibold border-b-2 border-primary-600 text-primary-600 flex items-center gap-2 transition-all">
            <i data-lucide="file-text" class="w-4.5 h-4.5"></i>
            Single File
        </button>
        <button id="tab-batch" onclick="setAppMode('batch')" class="px-4 py-3 text-sm font-semibold border-b-2 border-transparent text-slate-500 hover:text-slate-800 flex items-center gap-2 transition-all">
            <i data-lucide="files" class="w-4.5 h-4.5"></i>
            Batch Processing
            <span id="batch-count-badge" class="hidden bg-slate-100 border border-slate-200 text-slate-700 text-[10px] font-bold px-1.5 py-0.5 rounded-full">0</span>
        </button>
    </div>

    <!-- Main Content Split View -->
    <main class="flex-grow flex flex-col lg:flex-row overflow-hidden">

        <!-- Left Pane: Document Viewer -->
        <section class="lg:w-3/5 w-full border-r border-slate-200 bg-slate-100 flex flex-col relative">
            <!-- Upload Overlay (hidden when file loaded) -->
            <div id="upload-zone" class="absolute inset-0 z-10 bg-slate-50 p-6 flex flex-col items-center justify-center transition-colors border-2 border-dashed border-slate-300 m-4 rounded-xl">
                <div class="bg-white p-4 rounded-full shadow-sm mb-4 text-primary-500">
                    <i data-lucide="upload-cloud" class="w-8 h-8"></i>
                </div>
                <h3 id="upload-title" class="text-lg font-medium text-slate-700 mb-1">Upload Document</h3>
                <p id="upload-description" class="text-sm text-slate-500 mb-6 text-center max-w-sm">Drag and drop your PDF or Image file here, or click to browse.</p>
                <input type="file" id="file-input" class="hidden" accept=".pdf,image/png,image/jpeg,image/jpg">
                <button onclick="document.getElementById('file-input').click()" class="bg-white border border-slate-200 shadow-sm text-slate-700 px-6 py-2.5 rounded-lg font-medium hover:bg-slate-50 transition-colors flex items-center gap-2">
                    <i data-lucide="folder-search" class="w-4 h-4"></i>
                    Browse Files
                </button>
                <p class="text-xs text-slate-400 mt-4">Supported formats: PDF, PNG, JPEG</p>
            </div>

            <!-- Header above viewer (shown when file loaded) -->
            <div id="viewer-header" class="hidden bg-white/80 backdrop-blur border-b border-slate-200 p-3 flex justify-between items-center absolute top-0 w-full z-20">
                <div class="flex items-center gap-2 truncate max-w-md">
                    <i data-lucide="file-text" class="w-4 h-4 text-slate-400 shrink-0"></i>
                    <span id="file-name-display" class="text-sm font-medium text-slate-700 truncate">document.pdf</span>
                    <span id="file-size-display" class="text-xs text-slate-400 ml-2 shrink-0"></span>
                </div>
                <button onclick="resetApp()" class="text-xs text-red-600 hover:text-red-700 bg-red-50 hover:bg-red-100 px-3 py-1.5 rounded-md font-medium transition-colors flex items-center gap-1">
                    <i data-lucide="x" class="w-3 h-3"></i> Clear
                </button>
            </div>

            <!-- Multi-file Tabs (shows up below the viewer header only when 2+ files are uploaded) -->
            <div id="multi-file-tabs" class="hidden absolute top-[52px] left-0 right-0 bg-slate-50/90 backdrop-blur border-b border-slate-200 px-3 py-2 flex gap-2 overflow-x-auto z-10 shadow-sm">
                <!-- Tab items injected dynamically -->
            </div>

            <!-- Actual Preview Container -->
            <div id="preview-container" class="flex-grow w-full h-full p-4 pt-16 overflow-auto flex flex-col items-center hidden">
                <!-- Image or iframe injected here -->
            </div>
        </section>

        <!-- Right Pane: Controls & Results -->
        <section class="lg:w-2/5 w-full bg-white flex flex-col overflow-hidden shadow-[-4px_0_15px_-3px_rgba(0,0,0,0.05)] z-20 relative">

            <div class="p-6 border-b border-slate-100 shrink-0">
                <h2 id="action-title" class="text-lg font-semibold text-slate-800 mb-1">Analysis Action</h2>
                <p id="action-desc" class="text-sm text-slate-500 mb-5">Run the classifier to identify the document type.</p>

                <button id="analyze-btn" disabled class="w-full bg-primary-600 hover:bg-primary-700 disabled:bg-slate-200 disabled:text-slate-400 disabled:cursor-not-allowed text-white font-medium py-3 px-4 rounded-lg shadow-sm transition-all flex justify-center items-center gap-2">
                    <i data-lucide="scan" class="w-5 h-5"></i>
                    <span id="analyze-btn-text">Classify Document</span>
                </button>
            </div>

            <div class="flex-grow overflow-y-auto p-6 bg-slate-50/50">
                <!-- Empty State -->
                <div id="results-empty" class="h-full flex flex-col items-center justify-center text-slate-400">
                    <i data-lucide="layout-template" class="w-12 h-12 mb-3 opacity-50"></i>
                    <p class="text-sm">Results will appear here</p>
                </div>

                <!-- Loading State -->
                <div id="results-loading" class="hidden h-full flex flex-col items-center justify-center text-primary-600">
                    <i data-lucide="loader-2" class="w-10 h-10 mb-4 animate-spin"></i>
                    <p class="text-sm font-medium text-slate-600 animate-pulse">Running LayoutLMv3 + OCR inference...</p>
                </div>

                <!-- Results Content -->
                <div id="results-content" class="hidden flex flex-col gap-4">
                    <div class="flex items-center justify-between mb-2">
                        <h3 class="font-semibold text-slate-700 flex items-center gap-2">
                            <i data-lucide="check-circle-2" class="w-4 h-4 text-primary-500"></i>
                            Classification Results
                        </h3>
                    </div>

                    <div id="predictions-list" class="flex flex-col gap-3">
                        <!-- Result Cards Injected Here -->
                    </div>

                    <!-- Raw JSON Viewer Accordion -->
                    <div class="mt-6 border border-slate-200 rounded-lg bg-white overflow-hidden">
                        <button onclick="toggleJson()" class="w-full px-4 py-3 bg-slate-50 flex justify-between items-center text-sm font-medium text-slate-600 hover:bg-slate-100 transition-colors">
                            <span class="flex items-center gap-2"><i data-lucide="code" class="w-4 h-4"></i> Raw API Response</span>
                            <i data-lucide="chevron-down" id="json-chevron" class="w-4 h-4 transition-transform"></i>
                        </button>
                        <div id="json-container" class="hidden border-t border-slate-200">
                            <pre id="json-output" class="p-4 text-xs font-mono text-slate-700 overflow-x-auto bg-slate-900 !text-green-400 max-h-64 overflow-y-auto"></pre>
                        </div>
                    </div>
                </div>

                <!-- Error State -->
                <div id="error-state" class="hidden p-4 bg-red-50 border border-red-200 rounded-lg text-red-700 flex items-start gap-3 mt-4">
                    <i data-lucide="alert-triangle" class="w-5 h-5 shrink-0 mt-0.5 text-red-500"></i>
                    <div>
                        <h4 class="font-medium text-sm mb-1">Classification Failed</h4>
                        <p id="error-message" class="text-xs opacity-90">Cannot connect to the server.</p>
                    </div>
                </div>

            </div>
        </section>
    </main>

    <!-- Footer -->
    <footer class="bg-white border-t border-slate-200 p-3 text-center shrink-0 z-20">
        <p class="text-xs text-slate-500 font-medium flex items-center justify-center gap-1.5">
            Developed by <span class="font-bold text-slate-800">Arca Ai</span>
        </p>
        <p class="text-[10px] text-slate-400 mt-1">Demo API token is shared and capped at 30 requests/minute; it expires or may be rotated. Contact ArcaAI for your own token.</p>
    </footer>

    <!-- Application Logic -->
    <script>
        // Initialize Icons (non-fatal if the CDN is unreachable)
        function initIcons(root) {
            try {
                if (typeof lucide !== 'undefined' && lucide.createIcons) {
                    lucide.createIcons(root ? { root } : undefined);
                }
            } catch (e) {
                console.warn('lucide icons unavailable:', e);
            }
        }
        initIcons();

        // Configure PDF.js worker
        if (typeof pdfjsLib !== 'undefined') {
            pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
        }

        // Mode Navigation Tabs
        const tabSingle = document.getElementById('tab-single');
        const tabBatch = document.getElementById('tab-batch');
        const batchCountBadge = document.getElementById('batch-count-badge');

        // DOM Elements
        const uploadZone = document.getElementById('upload-zone');
        const uploadTitle = document.getElementById('upload-title');
        const uploadDescription = document.getElementById('upload-description');
        const fileInput = document.getElementById('file-input');

        const analyzeBtn = document.getElementById('analyze-btn');
        const analyzeBtnText = document.getElementById('analyze-btn-text');
        const actionTitle = document.getElementById('action-title');
        const actionDesc = document.getElementById('action-desc');

        const previewContainer = document.getElementById('preview-container');
        const viewerHeader = document.getElementById('viewer-header');
        const multiFileTabs = document.getElementById('multi-file-tabs');

        // Display elements
        const fileNameDisplay = document.getElementById('file-name-display');
        const fileSizeDisplay = document.getElementById('file-size-display');

        // Result views
        const resultsEmpty = document.getElementById('results-empty');
        const resultsLoading = document.getElementById('results-loading');
        const resultsContent = document.getElementById('results-content');
        const errorState = document.getElementById('error-state');
        const errorMessage = document.getElementById('error-message');
        const predictionsList = document.getElementById('predictions-list');
        const jsonOutput = document.getElementById('json-output');

        // State
        let currentMode = 'single'; // 'single' or 'batch'
        let currentFiles = []; // array of File
        let objectUrl = null;
        let activeFileIndex = 0;

        // Configuration
        const MOCK_LABELS = ['bill', 'discharge_summary', 'echs_card', 'lab_report', 'prescription_slip', 'referral_letter_by_polyclinic'];

        // Mode Switching
        function setAppMode(mode) {
            currentMode = mode;

            // UI Visual Tab Toggle
            if (mode === 'single') {
                tabSingle.className = "px-4 py-3 text-sm font-semibold border-b-2 border-primary-600 text-primary-600 flex items-center gap-2 transition-all";
                tabBatch.className = "px-4 py-3 text-sm font-semibold border-b-2 border-transparent text-slate-500 hover:text-slate-800 flex items-center gap-2 transition-all";

                // Adjust File Input Type
                fileInput.removeAttribute('multiple');

                // Adjust Upload UI instructions
                uploadTitle.textContent = "Upload Document";
                uploadDescription.textContent = "Drag and drop your PDF or Image file here, or click to browse.";

                actionTitle.textContent = "Analysis Action";
                actionDesc.textContent = "Run the classifier to identify the document type.";
            } else {
                tabSingle.className = "px-4 py-3 text-sm font-semibold border-b-2 border-transparent text-slate-500 hover:text-slate-800 flex items-center gap-2 transition-all";
                tabBatch.className = "px-4 py-3 text-sm font-semibold border-b-2 border-primary-600 text-primary-600 flex items-center gap-2 transition-all";

                // Adjust File Input Type
                fileInput.setAttribute('multiple', 'multiple');

                // Adjust Upload UI instructions
                uploadTitle.textContent = "Upload Documents (Batch)";
                uploadDescription.textContent = "Drag and drop one or multiple PDFs / Images here, or click to browse.";

                actionTitle.textContent = "Batch Action";
                actionDesc.textContent = "Submit all files currently in the queue to LayoutLMv3 in parallel.";
            }

            // Always reset current inputs when switching modes to avoid configuration mismatch
            resetApp();
        }

        // Format file size
        function formatBytes(bytes, decimals = 2) {
            if (bytes === 0) return '0 Bytes';
            const k = 1024;
            const dm = decimals < 0 ? 0 : decimals;
            const sizes = ['Bytes', 'KB', 'MB', 'GB'];
            const i = Math.floor(Math.log(bytes) / Math.log(k));
            return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
        }

        // Drag and Drop Handlers
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            uploadZone.addEventListener(eventName, preventDefaults, false);
        });

        function preventDefaults(e) {
            e.preventDefault();
            e.stopPropagation();
        }

        ['dragenter', 'dragover'].forEach(eventName => {
            uploadZone.addEventListener(eventName, () => uploadZone.classList.add('drag-active'), false);
        });

        ['dragleave', 'drop'].forEach(eventName => {
            uploadZone.addEventListener(eventName, () => uploadZone.classList.remove('drag-active'), false);
        });

        uploadZone.addEventListener('drop', (e) => {
            preventDefaults(e);
            const dt = e.dataTransfer;
            if (!dt.files.length) return;
            handleFiles(dt.files);
        });
        fileInput.addEventListener('change', (e) => {
            if (!e.target.files.length) return;
            handleFiles(e.target.files);
        }, false);

        // handle one or multiple files (File or FileList)
        function handleFiles(filesInput) {
            let files = filesInput instanceof FileList ? Array.from(filesInput) : [filesInput];
            if (!files.length) return;

            // Enforcement of single file mode constraints
            if (currentMode === 'single') {
                files = [files[0]];
            }

            const validTypes = ['application/pdf', 'image/jpeg', 'image/png', 'image/jpg'];
            const invalid = files.find(f => !validTypes.includes(f.type));
            if (invalid) {
                alert("Please upload only PDF or Image (PNG/JPG) files.");
                return;
            }

            currentFiles = files;
            activeFileIndex = 0;

            uploadZone.classList.add('hidden');
            viewerHeader.classList.remove('hidden');
            previewContainer.classList.remove('hidden');
            analyzeBtn.disabled = false;

            updateViewerHeader();
            renderSelectedFiles(files);
            previewFile(activeFileIndex);

            showState('empty');
        }

        function updateViewerHeader() {
            if (currentFiles.length === 1) {
                fileNameDisplay.textContent = currentFiles[0].name;
                fileSizeDisplay.textContent = formatBytes(currentFiles[0].size);
                multiFileTabs.classList.add('hidden');
                previewContainer.classList.remove('pt-28');
                previewContainer.classList.add('pt-16');
                analyzeBtnText.textContent = "Classify Document";

                batchCountBadge.classList.add('hidden');
            } else {
                fileNameDisplay.textContent = `${currentFiles.length} files selected`;
                fileSizeDisplay.textContent = `Batch Processing`;
                multiFileTabs.classList.remove('hidden');
                previewContainer.classList.remove('pt-16');
                previewContainer.classList.add('pt-28');
                analyzeBtnText.textContent = `Process Batch (${currentFiles.length})`;

                batchCountBadge.textContent = currentFiles.length;
                batchCountBadge.classList.remove('hidden');
            }
        }

        function renderSelectedFiles(files) {
            multiFileTabs.innerHTML = '';
            if (files.length <= 1) return;

            files.forEach((file, index) => {
                const isActive = index === activeFileIndex;
                const tab = document.createElement('button');
                tab.className = `px-3 py-1.5 rounded-lg text-xs font-semibold transition-all flex items-center gap-1.5 shrink-0 border ${
                    isActive
                    ? 'bg-primary-50 text-primary-700 border-primary-200 ring-1 ring-primary-200'
                    : 'bg-white text-slate-600 border-slate-200 hover:bg-slate-50 shadow-sm'
                }`;

                const iconName = file.type === 'application/pdf' ? 'file-text' : 'image';
                tab.innerHTML = `<i data-lucide="${iconName}" class="w-3.5 h-3.5"></i> <span class="truncate max-w-[120px]">${file.name}</span>`;

                tab.addEventListener('click', () => {
                    activeFileIndex = index;
                    previewFile(index);
                    renderSelectedFiles(files);
                });

                multiFileTabs.appendChild(tab);
            });

            initIcons(multiFileTabs);
        }

        function previewFile(index) {
            const file = currentFiles[index];
            if (!file) return;

            if (objectUrl) URL.revokeObjectURL(objectUrl);
            objectUrl = URL.createObjectURL(file);

            previewContainer.innerHTML = '';
            if (file.type.startsWith('image/')) {
                const img = document.createElement('img');
                img.src = objectUrl;
                img.alt = file.name;
                img.className = 'max-w-full max-h-full object-contain rounded-lg shadow-sm border border-slate-200 bg-white';
                previewContainer.appendChild(img);
            } else if (file.type === 'application/pdf') {
                previewPdf(file);
            }
        }

        async function previewPdf(file) {
            try {
                if (typeof pdfjsLib === 'undefined') {
                    throw new Error('PDF.js failed to load');
                }
                const data = await file.arrayBuffer();
                const pdf = await pdfjsLib.getDocument({ data }).promise;
                previewContainer.innerHTML = '';
                const scale = 1.5;
                for (let i = 1; i <= pdf.numPages; i++) {
                    const page = await pdf.getPage(i);
                    const viewport = page.getViewport({ scale });
                    const canvas = document.createElement('canvas');
                    canvas.width = viewport.width;
                    canvas.height = viewport.height;
                    canvas.className = 'w-full h-auto rounded-lg shadow-sm border border-slate-200 bg-white mb-3';
                    const ctx = canvas.getContext('2d');
                    await page.render({ canvasContext: ctx, viewport }).promise;
                    previewContainer.appendChild(canvas);
                }
            } catch (err) {
                console.error('PDF preview error:', err);
                previewContainer.innerHTML =
                    `<p class="text-sm text-slate-500 italic p-4">PDF preview failed: ${err.message}</p>`;
            }
        }

        function resetApp() {
            currentFiles = [];
            activeFileIndex = 0;
            if (objectUrl) URL.revokeObjectURL(objectUrl);
            fileInput.value = '';

            uploadZone.classList.remove('hidden');
            viewerHeader.classList.add('hidden');
            multiFileTabs.classList.add('hidden');
            previewContainer.classList.add('hidden');
            analyzeBtn.disabled = true;

            batchCountBadge.classList.add('hidden');

            if (currentMode === 'single') {
                analyzeBtnText.textContent = "Classify Document";
            } else {
                analyzeBtnText.textContent = "Process Batch (0)";
            }

            showState('empty');
        }

        function showState(state) {
            resultsEmpty.classList.add('hidden');
            resultsLoading.classList.add('hidden');
            resultsContent.classList.add('hidden');
            errorState.classList.add('hidden');

            if (state === 'empty') resultsEmpty.classList.remove('hidden');
            if (state === 'loading') resultsLoading.classList.remove('hidden');
            if (state === 'content') resultsContent.classList.remove('hidden');
            if (state === 'error') errorState.classList.remove('hidden');
        }

        function toggleJson() {
            const container = document.getElementById('json-container');
            const chevron = document.getElementById('json-chevron');
            container.classList.toggle('hidden');
            chevron.style.transform = container.classList.contains('hidden') ? 'rotate(0deg)' : 'rotate(180deg)';
        }

        // Label Color mapping helper
        function getLabelColorClass(label) {
            const l = label.toLowerCase();
            if (l.includes('discharge')) return 'bg-blue-50 text-blue-700 border-blue-200 ring-blue-500/20';
            if (l.includes('lab')) return 'bg-purple-50 text-purple-700 border-purple-200 ring-purple-500/20';
            if (l.includes('bill')) return 'bg-emerald-50 text-emerald-700 border-emerald-200 ring-emerald-500/20';
            if (l.includes('prescription')) return 'bg-amber-50 text-amber-700 border-amber-200 ring-amber-500/20';
            return 'bg-slate-100 text-slate-700 border-slate-200 ring-slate-500/20';
        }

        // API Interaction
        analyzeBtn.addEventListener('click', async () => {
            if (!currentFiles || currentFiles.length === 0) return;

            showState('loading');
            analyzeBtn.disabled = true;

            const isMockMode = document.getElementById('mock-mode').checked;
            const baseUrl = document.getElementById('api-url').value.replace(/\/$/, '');
            const apiKey = document.getElementById('api-key').value.trim();

            try {
                let data;

                if (isMockMode) {
                    await new Promise(r => setTimeout(r, 1500));
                    const mockResults = [];
                    for (const file of currentFiles) {
                        const numPages = file.type === 'application/pdf' ? Math.floor(Math.random() * 2) + 1 : 1;
                        const docType = MOCK_LABELS[Math.floor(Math.random() * MOCK_LABELS.length)];
                        for (let i = 1; i <= numPages; i++) {
                            mockResults.push({
                                file_path: `/temp/uploads/${file.name}`,
                                page: i,
                                label: docType,
                                confidence: 0.85 + Math.random() * 0.14
                            });
                        }
                    }
                    data = mockResults;
                } else {
                    const formData = new FormData();
                    const headers = { 'X-API-Key': apiKey };
                    if (currentFiles.length === 1) {
                        formData.append('file', currentFiles[0]);
                        const resp = await fetch(`${baseUrl}/predict/upload`, { method: 'POST', headers, body: formData });
                        if (!resp.ok) throw new Error(`HTTP ${resp.status}: ${resp.statusText}`);
                        data = await resp.json();
                    } else {
                        currentFiles.forEach(f => formData.append('files', f));
                        const resp = await fetch(`${baseUrl}/predict/upload/batch`, { method: 'POST', headers, body: formData });
                        if (!resp.ok) throw new Error(`HTTP ${resp.status}: ${resp.statusText}`);
                        data = await resp.json();
                    }
                }

                renderResults(data);
                showState('content');
            } catch (err) {
                console.error("Classification error:", err);
                errorMessage.textContent = err.message || "Failed to connect to the classification service.";
                showState('error');
            } finally {
                analyzeBtn.disabled = false;
            }
        });

        function renderResults(data) {
            predictionsList.innerHTML = '';
            jsonOutput.textContent = JSON.stringify(data, null, 2);

            if (!Array.isArray(data) || data.length === 0) {
                predictionsList.innerHTML = '<p class="text-sm text-slate-500 italic">No predictions returned.</p>';
                return;
            }

            data.forEach((pred, index) => {
                const confPercent = (pred.confidence * 100).toFixed(1);
                const colorClasses = getLabelColorClass(pred.label);

                // Construct card for each page prediction
                const card = document.createElement('div');
                card.className = `p-4 rounded-xl border ${colorClasses.split(' ')[2]} bg-white shadow-sm ring-1 ${colorClasses.split(' ')[3]} relative overflow-hidden`;

                // subtle left border highlight
                const indicatorColor = colorClasses.split(' ')[1].replace('text-', 'bg-');

                card.innerHTML = `
                    <div class="absolute left-0 top-0 bottom-0 w-1 ${indicatorColor}"></div>
                    <div class="pl-2">
                        <div class="flex justify-between items-start mb-2">
                            <div>
                                <span class="text-[10px] font-bold uppercase tracking-wider text-slate-400 mb-1 block">Predicted Class</span>
                                <h4 class="text-lg font-bold ${colorClasses.split(' ')[1]} leading-tight">${pred.label}</h4>
                            </div>
                            <div class="flex flex-col items-end">
                                <span class="text-[10px] font-bold uppercase tracking-wider text-slate-400 mb-1">Confidence</span>
                                <div class="bg-slate-100 px-2 py-1 rounded text-sm font-bold text-slate-700 flex items-center gap-1">
                                    ${confPercent}%
                                </div>
                            </div>
                        </div>
                        <div class="flex items-center gap-4 mt-3 text-xs text-slate-500 border-t border-slate-100 pt-3">
                            <div class="flex items-center gap-1" title="Page Number">
                                <i data-lucide="file" class="w-3.5 h-3.5"></i> Page ${pred.page}
                            </div>
                            <div class="flex items-center gap-1 truncate" title="File Path">
                                <i data-lucide="hard-drive" class="w-3.5 h-3.5"></i>
                                <span class="truncate max-w-[150px]">${pred.file_path.split('/').pop()}</span>
                            </div>
                        </div>

                        <!-- Confidence Bar -->
                        <div class="w-full bg-slate-100 rounded-full h-1.5 mt-3 overflow-hidden">
                            <div class="${indicatorColor} h-1.5 rounded-full transition-all duration-1000" style="width: 0%"></div>
                        </div>
                    </div>
                `;

                predictionsList.appendChild(card);

                // Re-init lucide icons for new elements
                initIcons(card);

                // Animate progress bar slightly after insertion
                setTimeout(() => {
                    const bar = card.querySelector('.transition-all');
                    if(bar) bar.style.width = `${confPercent}%`;
                }, 50);
            });
        }
    </script>
</body>
</html>