first completed version. sorting for booklets

assets/css/custom.css

@@ -0,0 +1,56 @@
+/* Custom Styles */
+#drop-area {
+    cursor: pointer;
+    transition: background-color 0.2s ease-in-out;
+}
+
+#drop-area.drag-over {
+    background-color: #e9ecef;
+}
+
+/* Imposition Preview Styles */
+.sheet-preview {
+    display: flex;
+    justify-content: space-around;
+    border: 1px solid #dee2e6;
+    border-radius: 5px;
+    padding: 10px;
+    margin-bottom: 15px;
+    background-color: #fff;
+    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
+}
+
+.sheet-side {
+    width: 48%;
+    border: 1px dashed #6c757d;
+    padding: 10px;
+    text-align: center;
+}
+
+.page-preview {
+    display: inline-block;
+    width: 45%;
+    height: 100px;
+    line-height: 100px;
+    border: 1px solid #ced4da;
+    margin: 5px;
+    background-color: #e9ecef;
+    font-weight: bold;
+    text-align: center;
+    vertical-align: middle;
+}
+
+.blank-page {
+    background-color: #6c757d;
+    color: #fff;
+}
+
+#recommendation-table th,
+#recommendation-table td {
+    padding: 0.25rem 0.5rem;
+}
+
+#drop-area.loaded {
+    padding: 1rem !important;
+    min-height: auto;
+}

assets/js/main.js

@@ -0,0 +1,301 @@
+document.addEventListener('DOMContentLoaded', function () {
+    const { PDFDocument } = PDFLib;
+
+    const dropArea = document.getElementById('drop-area');
+    const fileInput = document.getElementById('file-input');
+    const fileSelectBtn = document.getElementById('file-select-btn');
+    const pdfInfo = document.getElementById('pdf-info');
+    const pdfFilename = document.getElementById('pdf-filename');
+    const pdfPageCount = document.getElementById('pdf-page-count');
+    const pdfPaperCount = document.getElementById('pdf-paper-count');
+    const previewBtn = document.getElementById('preview-btn');
+    const exportSingleBtn = document.getElementById('export-single-btn');
+    const exportZipBtn = document.getElementById('export-zip-btn');
+    const bookletSizeInput = document.getElementById('booklet-size');
+    const firstBookletSizeInput = document.getElementById('first-booklet-size');
+    const blankPagesInput = document.getElementById('blank-pages-start');
+
+    let originalPdfBytes = null;
+    let originalPageCount = 0;
+
+    // Event Listeners
+    ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
+        dropArea.addEventListener(eventName, preventDefaults, false);
+        document.body.addEventListener(eventName, preventDefaults, false);
+    });
+    ['dragenter', 'dragover'].forEach(eventName => dropArea.addEventListener(eventName, () => dropArea.classList.add('drag-over'), false));
+    ['dragleave', 'drop'].forEach(eventName => dropArea.addEventListener(eventName, () => dropArea.classList.remove('drag-over'), false));
+    dropArea.addEventListener('drop', handleDrop, false);
+    fileSelectBtn.addEventListener('click', () => fileInput.click());
+    fileInput.addEventListener('change', handleFileSelect, false);
+    previewBtn.addEventListener('click', updatePreview);
+    exportSingleBtn.addEventListener('click', exportAsSinglePdf);
+    exportZipBtn.addEventListener('click', exportAsZip);
+
+
+    function preventDefaults(e) {
+        e.preventDefault();
+        e.stopPropagation();
+    }
+
+    function handleDrop(e) {
+        handleFiles(e.dataTransfer.files);
+    }
+
+    function handleFileSelect(e) {
+        handleFiles(e.target.files);
+    }
+
+    async function handleFiles(files) {
+        if (files.length > 0) {
+            const file = files[0];
+            if (file.type === 'application/pdf') {
+                pdfFilename.textContent = file.name;
+                dropArea.classList.add('loaded');
+                dropArea.querySelector('p').textContent = 'Drag & drop or click to select a different PDF.';
+                const fileReader = new FileReader();
+                fileReader.onload = async function() {
+                    originalPdfBytes = new Uint8Array(this.result);
+                    try {
+                        const pdfDoc = await PDFDocument.load(originalPdfBytes);
+                        originalPageCount = pdfDoc.getPageCount();
+                        pdfPageCount.textContent = originalPageCount;
+                        const paperCount = Math.ceil(originalPageCount / 4);
+                        pdfPaperCount.textContent = paperCount;
+                        pdfInfo.classList.remove('d-none');
+                        document.getElementById('recommendation-section').classList.remove('d-none');
+                        previewBtn.disabled = false;
+                        exportSingleBtn.disabled = false;
+                        exportZipBtn.disabled = false;
+                        updateRecommendationTable();
+                        updatePreview(); // Auto-update preview on new file
+                    } catch (e) {
+                        console.error(e);
+                        alert('Failed to load PDF. The file may be corrupt.');
+                    }
+                };
+                fileReader.readAsArrayBuffer(file);
+            } else {
+                alert('Please select a PDF file.');
+            }
+        }
+    }
+
+    function padAndImposeBooklet(bookletPages) {
+        const paddedBookletSize = Math.ceil(bookletPages.length / 4) * 4;
+        while (bookletPages.length < paddedBookletSize) {
+            bookletPages.push({ type: 'blank' });
+        }
+        return imposeBooklet(bookletPages);
+    }
+
+    function calculateImposition() {
+        const bookletSize = parseInt(bookletSizeInput.value, 10);
+        let firstBookletSize = parseInt(firstBookletSizeInput.value, 10) || bookletSize;
+        const blankPagesAtStart = parseInt(blankPagesInput.value, 10) || 0;
+
+        if (bookletSize % 4 !== 0 || (firstBookletSize && firstBookletSize % 4 !== 0)) {
+            alert('Booklet sizes must be a multiple of 4.');
+            return null;
+        }
+
+        const totalPages = originalPageCount + blankPagesAtStart;
+        let sourcePages = [];
+        for (let i = 0; i < blankPagesAtStart; i++) sourcePages.push({ type: 'blank' });
+        for (let i = 1; i <= originalPageCount; i++) sourcePages.push({ type: 'pdf', pageNum: i });
+
+        let booklets = [];
+        
+        // First booklet
+        let firstBookletActualSize = (firstBookletSize > 0 && totalPages > 0) ? firstBookletSize : bookletSize;
+        if (totalPages < firstBookletSize) {
+            firstBookletActualSize = Math.ceil(totalPages / 4) * 4;
+        }
+        
+        const firstBookletPages = sourcePages.splice(0, firstBookletActualSize);
+        booklets.push(padAndImposeBooklet(firstBookletPages));
+
+        // Remaining booklets
+        while (sourcePages.length > 0) {
+            const bookletPages = sourcePages.splice(0, bookletSize);
+            booklets.push(padAndImposeBooklet(bookletPages));
+        }
+
+        return booklets;
+    }
+
+    function imposeBooklet(bookletPages) {
+        const size = bookletPages.length;
+        const imposed = [];
+        for (let i = 0; i < size / 2; i += 2) {
+            imposed.push(bookletPages[size - 1 - i]);
+            imposed.push(bookletPages[i]);
+            imposed.push(bookletPages[i + 1]);
+            imposed.push(bookletPages[size - 2 - i]);
+        }
+        return imposed;
+    }
+
+    function updatePreview() {
+        const booklets = calculateImposition();
+        if (!booklets) return;
+
+        const previewArea = document.getElementById('imposition-preview');
+        let html = '';
+
+        booklets.forEach((booklet, index) => {
+            html += `<h5 class="mt-3">Booklet ${index + 1}</h5>`;
+            for (let i = 0; i < booklet.length; i += 4) {
+                const sheetPages = booklet.slice(i, i + 4);
+                html += `
+                    <div class="sheet-preview">
+                        <div class="sheet-side">
+                            <strong>Front</strong>
+                            <div class="page-preview ${sheetPages[0].type === 'blank' ? 'blank-page' : ''}">${sheetPages[0].type === 'blank' ? 'BLANK' : 'Page ' + sheetPages[0].pageNum}</div>
+                            <div class="page-preview ${sheetPages[1].type === 'blank' ? 'blank-page' : ''}">${sheetPages[1].type === 'blank' ? 'BLANK' : 'Page ' + sheetPages[1].pageNum}</div>
+                        </div>
+                        <div class="sheet-side">
+                            <strong>Back</strong>
+                            <div class="page-preview ${sheetPages[2].type === 'blank' ? 'blank-page' : ''}">${sheetPages[2].type === 'blank' ? 'BLANK' : 'Page ' + sheetPages[2].pageNum}</div>
+                            <div class="page-preview ${sheetPages[3].type === 'blank' ? 'blank-page' : ''}">${sheetPages[3].type === 'blank' ? 'BLANK' : 'Page ' + sheetPages[3].pageNum}</div>
+                        </div>
+                    </div>
+                `;
+            }
+        });
+
+        previewArea.innerHTML = html;
+    }
+
+    async function createBookletPdf(booklet, srcDoc) {
+        const { width, height } = srcDoc.getPage(0).getSize();
+        const newDoc = await PDFDocument.create();
+
+        for (const pageInfo of booklet) {
+            if (pageInfo.type === 'pdf') {
+                const [copiedPage] = await newDoc.copyPages(srcDoc, [pageInfo.pageNum - 1]);
+                newDoc.addPage(copiedPage);
+            } else {
+                newDoc.addPage([width, height]);
+            }
+        }
+        return newDoc;
+    }
+
+    async function exportAsSinglePdf() {
+        if (!originalPdfBytes) {
+            alert('Please upload a PDF first.');
+            return;
+        }
+
+        exportSingleBtn.disabled = true;
+        exportSingleBtn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> Exporting...';
+
+        const booklets = calculateImposition();
+        if (!booklets) {
+            exportSingleBtn.disabled = false;
+            exportSingleBtn.textContent = 'Export as Single PDF';
+            return;
+        }
+
+        try {
+            const srcDoc = await PDFDocument.load(originalPdfBytes);
+            const mergedPdf = await PDFDocument.create();
+
+            for (const booklet of booklets) {
+                const bookletPdf = await createBookletPdf(booklet, srcDoc);
+                const copiedPages = await mergedPdf.copyPages(bookletPdf, bookletPdf.getPageIndices());
+                copiedPages.forEach((page) => mergedPdf.addPage(page));
+            }
+
+            const pdfBytes = await mergedPdf.save();
+            download(pdfBytes, `imposed-booklet.pdf`, "application/pdf");
+
+        } catch (e) {
+            console.error(e);
+            alert('An error occurred while exporting the PDF.');
+        } finally {
+            exportSingleBtn.disabled = false;
+            exportSingleBtn.textContent = 'Export as Single PDF';
+        }
+    }
+
+    async function exportAsZip() {
+        if (!originalPdfBytes) {
+            alert('Please upload a PDF first.');
+            return;
+        }
+
+        exportZipBtn.disabled = true;
+        exportZipBtn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> Exporting...';
+
+        const booklets = calculateImposition();
+        if (!booklets) {
+            exportZipBtn.disabled = false;
+            exportZipBtn.textContent = 'Export as ZIP';
+            return;
+        }
+
+        try {
+            const srcDoc = await PDFDocument.load(originalPdfBytes);
+            const zip = new JSZip();
+
+            for (let i = 0; i < booklets.length; i++) {
+                const booklet = booklets[i];
+                const bookletPdf = await createBookletPdf(booklet, srcDoc);
+                const pdfBytes = await bookletPdf.save();
+                zip.file(`booklet-${i + 1}.pdf`, pdfBytes);
+            }
+
+            const zipBytes = await zip.generateAsync({ type: "blob" });
+            download(zipBytes, 'booklets.zip', 'application/zip');
+
+        } catch (e) {
+            console.error(e);
+            alert('An error occurred while exporting the ZIP file.');
+        } finally {
+            exportZipBtn.disabled = false;
+            exportZipBtn.textContent = 'Export as ZIP';
+        }
+    }
+
+    function download(data, filename, type) {
+        const blob = new Blob([data], { type: type });
+        const url = window.URL.createObjectURL(blob);
+        const a = document.createElement('a');
+        a.style.display = 'none';
+        a.href = url;
+        a.download = filename;
+        document.body.appendChild(a);
+        a.click();
+        window.URL.revokeObjectURL(url);
+        document.body.removeChild(a);
+    }
+
+    function updateRecommendationTable() {
+        if (originalPageCount === 0) return;
+
+        const tableBody = document.getElementById('recommendation-table-body');
+        tableBody.innerHTML = ''; // Clear existing rows
+
+        const totalPages = originalPageCount + (parseInt(blankPagesInput.value, 10) || 0);
+
+        for (let size = 4; size <= 32; size += 4) {
+            const numBooklets = Math.ceil(totalPages / size);
+            const lastBookletSize = totalPages % size || size;
+            
+            const row = `
+                <tr>
+                    <td>${size}</td>
+                    <td>${numBooklets}</td>
+                    <td>${lastBookletSize}</td>
+                </tr>
+            `;
+            tableBody.innerHTML += row;
+
+            if (numBooklets === 1) {
+                break; // Stop after the first size that fits all pages
+            }
+        }
+    }
+});

index.php

@@ -1,150 +1,124 @@
-<?php
-declare(strict_types=1);
-@ini_set('display_errors', '1');
-@error_reporting(E_ALL);
-@date_default_timezone_set('UTC');
-
-$phpVersion = PHP_VERSION;
-$now = date('Y-m-d H:i:s');
-?>
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1" />
-  <title>New Style</title>
-<?php
-// Read project preview data from environment
-$projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? '';
-$projectImageUrl = $_SERVER['PROJECT_IMAGE_URL'] ?? '';
-?>
-<?php if ($projectDescription): ?>
-  <!-- Meta description -->
-  <meta name="description" content='<?= htmlspecialchars($projectDescription) ?>' />
-  <!-- Open Graph meta tags -->
-  <meta property="og:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-  <!-- Twitter meta tags -->
-  <meta property="twitter:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-<?php endif; ?>
-<?php if ($projectImageUrl): ?>
-  <!-- Open Graph image -->
-  <meta property="og:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
-  <!-- Twitter image -->
-  <meta property="twitter:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
-<?php endif; ?>
-  <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@400;700&display=swap" rel="stylesheet">
-  <style>
-    :root {
-      --bg-color-start: #6a11cb;
-      --bg-color-end: #2575fc;
-      --text-color: #ffffff;
-      --card-bg-color: rgba(255, 255, 255, 0.01);
-      --card-border-color: rgba(255, 255, 255, 0.1);
-    }
-    body {
-      margin: 0;
-      font-family: 'Inter', sans-serif;
-      background: linear-gradient(45deg, var(--bg-color-start), var(--bg-color-end));
-      color: var(--text-color);
-      display: flex;
-      justify-content: center;
-      align-items: center;
-      min-height: 100vh;
-      text-align: center;
-      overflow: hidden;
-      position: relative;
-    }
-    body::before {
-      content: '';
-      position: absolute;
-      top: 0;
-      left: 0;
-      width: 100%;
-      height: 100%;
-      background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M-10 10L110 10M10 -10L10 110" stroke-width="1" stroke="rgba(255,255,255,0.05)"/></svg>');
-      animation: bg-pan 20s linear infinite;
-      z-index: -1;
-    }
-    @keyframes bg-pan {
-      0% { background-position: 0% 0%; }
-      100% { background-position: 100% 100%; }
-    }
-    main {
-      padding: 2rem;
-    }
-    .card {
-      background: var(--card-bg-color);
-      border: 1px solid var(--card-border-color);
-      border-radius: 16px;
-      padding: 2rem;
-      backdrop-filter: blur(20px);
-      -webkit-backdrop-filter: blur(20px);
-      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
-    }
-    .loader {
-      margin: 1.25rem auto 1.25rem;
-      width: 48px;
-      height: 48px;
-      border: 3px solid rgba(255, 255, 255, 0.25);
-      border-top-color: #fff;
-      border-radius: 50%;
-      animation: spin 1s linear infinite;
-    }
-    @keyframes spin {
-      from { transform: rotate(0deg); }
-      to   { transform: rotate(360deg); }
-    }
-    .hint {
-      opacity: 0.9;
-    }
-    .sr-only {
-      position: absolute;
-      width: 1px; height: 1px;
-      padding: 0; margin: -1px;
-      overflow: hidden;
-      clip: rect(0, 0, 0, 0);
-      white-space: nowrap; border: 0;
-    }
-    h1 {
-      font-size: 3rem;
-      font-weight: 700;
-      margin: 0 0 1rem;
-      letter-spacing: -1px;
-    }
-    p {
-      margin: 0.5rem 0;
-      font-size: 1.1rem;
-    }
-    code {
-      background: rgba(0,0,0,0.2);
-      padding: 2px 6px;
-      border-radius: 4px;
-      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
-    }
-    footer {
-      position: absolute;
-      bottom: 1rem;
-      font-size: 0.8rem;
-      opacity: 0.7;
-    }
-  </style>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>PDF Booklet Creator</title>
+    <meta name="description" content="Create print-ready booklets from PDF files.">
+    <meta name="keywords" content="pdf booklet, imposition, print-ready, booklet creator, pdf tools, prepress, printing, book binding, Built with Flatlogic Generator">
+    <meta property="og:title" content="PDF Booklet Creator">
+    <meta property="og:description" content="Create print-ready booklets from PDF files.">
+    <meta property="og:image" content="">
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:image" content="">
+
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css">
+    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
 </head>
 <body>
-  <main>
-    <div class="card">
-      <h1>Analyzing your requirements and generating your website…</h1>
-      <div class="loader" role="status" aria-live="polite" aria-label="Applying initial changes">
-        <span class="sr-only">Loading…</span>
-      </div>
-      <p class="hint"><?= ($_SERVER['HTTP_HOST'] ?? '') === 'appwizzy.com' ? 'AppWizzy' : 'Flatlogic' ?> AI is collecting your requirements and applying the first changes.</p>
-      <p class="hint">This page will update automatically as the plan is implemented.</p>
-      <p>Runtime: PHP <code><?= htmlspecialchars($phpVersion) ?></code> — UTC <code><?= htmlspecialchars($now) ?></code></p>
-    </div>
-  </main>
-  <footer>
-    Page updated: <?= htmlspecialchars($now) ?> (UTC)
-  </footer>
+
+    <header class="bg-primary text-white text-center p-3">
+        <h1>PDF Booklet Creator</h1>
+        <p class="lead">Create print-ready booklets from your PDF files</p>
+    </header>
+
+    <main class="container mt-4">
+        <div class="row">
+            <div class="col-md-6">
+                <div class="card">
+                    <div class="card-header">
+                        PDF Import
+                    </div>
+                    <div class="card-body">
+                        <div id="drop-area" class="border rounded p-5 text-center">
+                            <p>Drag & drop a PDF file here or click to select</p>
+                            <input type="file" id="file-input" class="d-none" accept=".pdf">
+                            <button id="file-select-btn" class="btn btn-secondary">Select PDF</button>
+                        </div>
+                        <div id="pdf-info" class="mt-3 d-none">
+                            <h5>PDF Information</h5>
+                            <p><strong>Filename:</strong> <span id="pdf-filename"></span></p>
+                            <div class="row">
+                                <div class="col-6">
+                                    <p><strong>Page Count:</strong> <span id="pdf-page-count"></span></p>
+                                </div>
+                                <div class="col-6">
+                                    <p><strong>Paper Sheets Required:</strong> <span id="pdf-paper-count"></span></p>
+                                </div>
+                            </div>
+                        </div>
+                        <div id="recommendation-section" class="mt-3 d-none">
+                            <h5>Booklet Size Recommendations</h5>
+                            <table id="recommendation-table" class="table table-striped">
+                                <thead>
+                                    <tr>
+                                        <th>Booklet Size</th>
+                                        <th>Number of Booklets</th>
+                                        <th>Last Booklet Size</th>
+                                    </tr>
+                                </thead>
+                                <tbody id="recommendation-table-body">
+                                    <!-- Rows will be added here dynamically -->
+                                </tbody>
+                            </table>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div class="col-md-6">
+                <div class="card">
+                    <div class="card-header">
+                        Booklet Settings
+                    </div>
+                    <div class="card-body">
+                        <form>
+                            <div class="mb-4">
+                                <label for="booklet-size" class="form-label">Booklet Size <i class="bi bi-info-circle" title="The number of pages in each booklet (must be a multiple of 4)."></i></label>
+                                <input type="number" class="form-control" id="booklet-size" value="16" step="4" min="4">
+                            </div>
+                            <div class="mb-4">
+                                <label for="first-booklet-size" class="form-label">First Booklet Pages <i class="bi bi-info-circle" title="Optional: Use a smaller page count for the first booklet."></i></label>
+                                <input type="number" class="form-control" id="first-booklet-size">
+                            </div>
+                            <div class="mb-4">
+                                <label for="blank-pages-start" class="form-label">Blank Pages at Start <i class="bi bi-info-circle" title="Add blank pages to the beginning of the first booklet."></i></label>
+                                <input type="number" class="form-control" id="blank-pages-start" value="0" min="0">
+                            </div>
+                            <div class="d-grid gap-2">
+                                <button type="button" class="btn btn-primary" id="preview-btn" disabled><i class="bi bi-eye"></i> Preview</button>
+                                <button type="button" class="btn btn-success" id="export-single-btn" disabled><i class="bi bi-file-earmark-pdf"></i> Export as Single PDF</button>
+                                <button type="button" class="btn btn-info" id="export-zip-btn" disabled><i class="bi bi-file-earmark-zip"></i> Export as ZIP</button>
+                            </div>
+                        </form>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row mt-4">
+            <div class="col-12">
+                <div class="card">
+                    <div class="card-header">
+                        Imposition Preview
+                    </div>
+                    <div class="card-body">
+                        <div id="imposition-preview" class="p-3 bg-light rounded" style="min-height: 100px; font-family: monospace;">
+                            <p class="text-muted">Click "Preview" to see the imposed page order.</p>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </main>
+
+    <footer class="text-center mt-4 p-3 bg-light">
+        <p>Built with <a href="https://flatlogic.com/" target="_blank">Flatlogic</a></p>
+    </footer>
+
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