`; setTimeout(() => aiOutputContainer.querySelector('.ai-suggestion-enter')?.classList.add('ai-suggestion-enter-active'), 10); } catch (error) { aiOutputContainer.innerHTML = `

Error: ${error.message}

`; } finally { button.disabled = false; buttonText.textContent = 'Refine for Technical Clarity'; spinner.classList.add('hidden'); } }; async function callGeminiAPI(text, systemPrompt) { const apiKey = ""; const apiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-preview-05-20:generateContent?key=${apiKey}`; const payload = { contents: [{ parts: [{ text: text }] }], systemInstruction: { parts: [{ text: systemPrompt }] }, }; const response = await fetch(apiUrl, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload) }); if (!response.ok) throw new Error((await response.json()).error?.message || `API Error`); const result = await response.json(); const candidate = result.candidates?.[0]; if (candidate?.content?.parts?.[0]?.text) return candidate.content.parts[0].text; throw new Error("Invalid response from AI model."); } window.downloadPDF = function() { const { jsPDF } = window.jspdf; const doc = new jsPDF({ orientation: 'p', unit: 'mm', format: 'a4' }); const docTitle = document.getElementById('input-title')?.value.trim() || 'Untitled Engineering Document'; const authors = document.getElementById('input-authors')?.value.trim() || 'No author specified'; const abstract = document.getElementById(`textarea-title`)?.value.trim() || 'No abstract provided.'; const leftMargin = 20, topMargin = 25, contentWidth = doc.internal.pageSize.getWidth() - leftMargin * 2; const pageHeight = doc.internal.pageSize.getHeight(), bottomMargin = 20; const lineHeight = 7, headingFontSize = 14, bodyFontSize = 11, font = 'Helvetica'; let cursorY = 0; // --- Title Page --- doc.setFont(font, 'bold'); doc.setFontSize(18); const titleLines = doc.splitTextToSize(docTitle, contentWidth); cursorY = pageHeight / 4; doc.text(titleLines, doc.internal.pageSize.getWidth() / 2, cursorY, { align: 'center' }); cursorY += titleLines.length * 10; doc.setFont(font, 'normal'); doc.setFontSize(12); const authorLines = doc.splitTextToSize(authors, contentWidth); doc.text(authorLines, doc.internal.pageSize.getWidth() / 2, cursorY + 5, { align: 'center' }); cursorY += authorLines.length * 8; const date = new Date().toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' }); doc.text(date, doc.internal.pageSize.getWidth() / 2, cursorY + 5, { align: 'center' }); doc.setLineWidth(0.5); doc.line(leftMargin, cursorY + 15, leftMargin + contentWidth, cursorY + 15); cursorY += 25; doc.setFont(font, 'bold'); doc.setFontSize(headingFontSize); doc.text('Abstract', leftMargin, cursorY); cursorY += lineHeight; doc.setFont(font, 'normal'); doc.setFontSize(bodyFontSize); const abstractLines = doc.splitTextToSize(abstract, contentWidth); doc.text(abstractLines, leftMargin, cursorY); doc.addPage(); cursorY = topMargin; // --- Main Content --- const addHeader = (title) => { doc.setFontSize(9); doc.setFont(font, 'normal'); const truncatedTitle = title.substring(0, 60) + (title.length > 60 ? '...' : ''); doc.text(truncatedTitle, leftMargin, topMargin - 12); }; const addFooter = (pageNum) => { doc.setFontSize(10); doc.text(String(pageNum), doc.internal.pageSize.getWidth() - leftMargin, pageHeight - 10); }; const checkPageBreak = () => { if (cursorY + (lineHeight * 2) > pageHeight - bottomMargin) { addFooter(doc.internal.getNumberOfPages()); doc.addPage(); cursorY = topMargin; addHeader(docTitle); } }; addHeader(docTitle); tabsData.slice(1).forEach((tab, index) => { // Skip title/abstract tab const textarea = document.getElementById(`textarea-${tab.id}`); if (!textarea || textarea.value.trim() === '') return; checkPageBreak(); cursorY += lineHeight * 2; checkPageBreak(); doc.setFont(font, 'bold'); doc.setFontSize(headingFontSize); const sectionTitle = `${index + 1}. ${tab.title}`; doc.text(sectionTitle, leftMargin, cursorY); cursorY += lineHeight + 2; doc.setFont(font, 'normal'); doc.setFontSize(bodyFontSize); const bodyTextLines = doc.splitTextToSize(textarea.value.trim(), contentWidth); bodyTextLines.forEach(line => { checkPageBreak(); doc.text(line, leftMargin, cursorY); cursorY += lineHeight; }); }); addFooter(doc.internal.getNumberOfPages()); doc.save(docTitle.replace(/[^a-z0-9]/gi, '_').toLowerCase() + '.pdf'); } if (prevBtn && nextBtn && downloadPdfBtn) { prevBtn.addEventListener('click', () => handleNavigation(-1)); nextBtn.addEventListener('click', () => handleNavigation(1)); downloadPdfBtn.addEventListener('click', window.downloadPDF); } initializeUI(); });