`;
elements.pdfContent.innerHTML = html;
elements.pdfContent.classList.remove('hidden');
try {
const canvas = await html2canvas(elements.pdfContent, { scale: 2 });
const imgData = canvas.toDataURL('image/png');
const pdf = new jsPDF('p', 'pt', 'a4');
const pdfWidth = pdf.internal.pageSize.getWidth();
const pdfHeight = pdf.internal.pageSize.getHeight();
const imgProps = pdf.getImageProperties(imgData);
const imgHeight = (imgProps.height * pdfWidth) / imgProps.width;
let heightLeft = imgHeight;
let position = 0;
pdf.addImage(imgData, 'PNG', 0, position, pdfWidth, imgHeight);
heightLeft -= pdfHeight;
while (heightLeft > 0) {
position = heightLeft - imgHeight;
pdf.addPage();
pdf.addImage(imgData, 'PNG', 0, position, pdfWidth, imgHeight);
heightLeft -= pdfHeight;
}
pdf.save('research-notes.pdf');
} catch (error) {
console.error("PDF Generation Error:", error);
} finally {
elements.pdfContent.classList.add('hidden');
}
};
const escapeHTML = (str) => str.replace(/[&<>'"]/g, tag => ({'&': '&','<': '<','>': '>',"'": ''','"': '"'}[tag]));
// --- EVENT LISTENERS ---
elements.tabButtons.dashboard.addEventListener('click', () => switchTab('dashboard'));
elements.tabButtons.input.addEventListener('click', () => { resetForm(); switchTab('input'); });
elements.prevBtn.addEventListener('click', () => { const i = TABS.indexOf(activeTab); if (i > 0) switchTab(TABS[i - 1]); });
elements.nextBtn.addEventListener('click', () => { const i = TABS.indexOf(activeTab); if (i < TABS.length - 1) switchTab(TABS[i + 1]); });
elements.noteForm.addEventListener('submit', handleSaveNote);
elements.cancelEditBtn.addEventListener('click', () => { resetForm(); switchTab('dashboard'); });
elements.topicFilter.addEventListener('change', renderNotes);
elements.downloadPdfBtn.addEventListener('click', downloadPDF);
elements.notesGrid.addEventListener('click', (e) => {
if (e.target.classList.contains('edit-btn')) handleEditNote(e.target.dataset.id);
if (e.target.classList.contains('delete-btn')) handleDeleteNote(e.target.dataset.id);
});
// --- INITIALIZATION ---
loadNotes();
updateTopicFilter();
renderNotes();
switchTab('dashboard');
});
