`;
}
resultsDisplay.innerHTML = resultHTML;
resultsSection.classList.remove('hidden');
}
// --- PDF DOWNLOAD LOGIC ---
async function downloadPDF() {
if (resultsSection.classList.contains('hidden')) {
alert("Please calculate your sleep debt first before downloading.");
return;
}
pdfLoader.classList.remove('hidden');
pdfDownloadBtn.disabled = true;
const { jsPDF } = window.jspdf;
const pdfExportContent = document.getElementById('pdf-export-area');
const results = getCalculationResults();
const ageGroupText = ageGroupSelect.options[ageGroupSelect.selectedIndex].text;
let dayRows = '';
for (let i = 0; i < 7; i++) {
dayRows += `
| ${last7Days[i]} |
${results.actualSleepPerDay[i].toFixed(1)} hours |
`;
}
pdfExportContent.innerHTML = `
Sleep Debt Report
Generated on: August 2, 2025
Your Weekly Sleep Log
| Day |
Hours Slept |
${dayRows}
| Total Actual Sleep |
${results.totalActual.toFixed(1)} hours |
Your Age Group
${ageGroupText}
Recommended Weekly Sleep
${results.totalRecommended.toFixed(1)} hours
${results.sleepDebt > 0 ? 'Your Sleep Debt' : 'Your Sleep Surplus'}
hours
`;
await new Promise(resolve => setTimeout(resolve, 100));
try {
const canvas = await html2canvas(pdfExportContent, { scale: 2 });
const imgData = canvas.toDataURL('image/png');
const pdf = new jsPDF({ orientation: "portrait", unit: "pt", format: "a4" });
const pageWidth = pdf.internal.pageSize.getWidth();
const margin = 40;
const imgProps = pdf.getImageProperties(imgData);
const pdfImageWidth = pageWidth - (margin * 2);
const pdfImageHeight = (imgProps.height * pdfImageWidth) / imgProps.width;
pdf.addImage(imgData, 'PNG', margin, margin, pdfImageWidth, pdfImageHeight);
pdf.save(`Sleep-Debt-Report-${new Date().toISOString().slice(0,10)}.pdf`);
} catch (error) {
console.error("Error generating PDF:", error);
alert("Sorry, there was an error creating the PDF.");
} finally {
pdfLoader.classList.add('hidden');
pdfDownloadBtn.disabled = false;
pdfExportContent.innerHTML = '';
}
}
// --- START THE APP ---
initialize();
});
