`;
lucide.createIcons();
return;
}
const { schedule, summary } = appData.results;
const tableRows = schedule.map(p => `
| ${p.paymentNumber} |
${formatDate(p.paymentDate)} |
${formatCurrency(p.paymentAmount)} |
${formatCurrency(p.remainingBalance)} |
`).join('');
dashboardContent.innerHTML = `
Each Installment
${formatCurrency(summary.eachPayment)}
Final Payment Date
${formatDate(summary.finalPaymentDate)}
Down Payment
${formatCurrency(summary.downPaymentAmount)}
Total Payments
${appData.inputs.numberOfPayments}
Full Schedule
| Payment # |
Date |
Amount |
Remaining Balance |
${tableRows || `| No installments required. |
`}
`;
document.getElementById('download-pdf-btn').addEventListener('click', generatePdf);
};
const renderConfigForm = () => {
const formContent = document.getElementById('content-plan-configuration');
if (!formContent) return;
formContent.innerHTML = `
Configure Your Installment Plan
`;
attachFormListeners();
};
// --- EVENT HANDLERS & LOGIC ---
const attachFormListeners = () => {
document.getElementById('calculate-plan-btn').addEventListener('click', () => {
appData.inputs.totalPrice = parseFloat(document.getElementById('total-price').value) || 0;
appData.inputs.downPaymentValue = parseFloat(document.getElementById('down-payment-value').value) || 0;
appData.inputs.downPaymentType = document.getElementById('down-payment-toggle').checked ? 'percent' : 'fixed';
appData.inputs.paymentFrequency = document.getElementById('payment-frequency').value;
appData.inputs.numberOfPayments = parseInt(document.getElementById('number-of-payments').value) || 1;
appData.inputs.startDate = document.getElementById('start-date').value;
appData.results = null; // force recalculation
calculateSchedule();
renderDashboard();
switchTab(0);
});
const toggle = document.getElementById('down-payment-toggle');
toggle.addEventListener('change', e => {
const isPercent = e.target.checked;
const dollarSign = toggle.closest('.flex').querySelector('span:first-child');
const percentSign = toggle.closest('.flex').querySelector('span:last-child');
dollarSign.classList.toggle('text-blue-600', !isPercent);
dollarSign.classList.toggle('text-gray-500', isPercent);
percentSign.classList.toggle('text-blue-600', isPercent);
percentSign.classList.toggle('text-gray-500', !isPercent);
});
};
const generatePdf = () => {
if (!appData.results) {
alert('Please calculate a schedule first.');
return;
}
loadingOverlay.style.display = 'flex';
const { jsPDF } = window.jspdf;
document.getElementById('pdf-generated-date').textContent = new Date().toLocaleDateString('en-US');
const pdfHeader = document.getElementById('pdf-header');
pdfHeader.classList.remove('hidden');
const fullContent = document.getElementById('pdf-content-area');
html2canvas(fullContent, { scale: 2, useCORS: true, logging: false, windowWidth: 1200 })
.then(canvas => {
pdfHeader.classList.add('hidden');
const imgData = canvas.toDataURL('image/jpeg', 0.95);
const pdf = new jsPDF({ orientation: 'portrait', unit: 'px', format: 'a4' });
const pdfWidth = pdf.internal.pageSize.getWidth();
const imgProps = pdf.getImageProperties(imgData);
const imgHeight = (imgProps.height * pdfWidth) / imgProps.width;
pdf.addImage(imgData, 'JPEG', 0, 0, pdfWidth, imgHeight);
pdf.save('Installment-Payment-Schedule.pdf');
loadingOverlay.style.display = 'none';
}).catch(err => {
console.error("PDF generation failed:", err);
pdfHeader.classList.add('hidden');
loadingOverlay.style.display = 'none';
alert('An error occurred generating the PDF.');
});
};
// --- TAB NAVIGATION & INITIALIZATION ---
const switchTab = (tabIndex) => {
activeTabIndex = tabIndex;
document.querySelectorAll('.tab-btn').forEach((btn, i) => btn.classList.toggle('active', i === tabIndex));
document.querySelectorAll('.tab-content').forEach((content, i) => content.classList.toggle('hidden', i !== tabIndex));
updateNavButtons();
};
const updateNavButtons = () => {
prevTabBtn.disabled = activeTabIndex === 0;
nextTabBtn.disabled = activeTabIndex === tabIdentifiers.length - 1;
};
const initializeUI = () => {
const tabs = [
{ name: 'Schedule Dashboard', id: 'schedule-dashboard' },
{ name: 'Plan Configuration', id: 'plan-configuration' }
];
tabIdentifiers = tabs.map(t => t.id);
tabsContainer.innerHTML = tabs.map(tab => `
`).join('');
mainContent.innerHTML = tabs.map(tab => `
`).join('');
tabs.forEach((tab, index) => {
document.getElementById(`tab-${tab.id}`).addEventListener('click', () => switchTab(index));
});
renderDashboard();
renderConfigForm();
switchTab(0);
};
initializeUI();
prevTabBtn.addEventListener('click', () => { if (activeTabIndex > 0) switchTab(activeTabIndex - 1); });
nextTabBtn.addEventListener('click', () => { if (activeTabIndex < tabIdentifiers.length - 1) switchTab(activeTabIndex + 1); });
});
