Impact Analysis
Annual Waste Reduction
${formatWeight(reduction)}
Percentage Reduction
${percentageReduction.toFixed(1)}%
`;
const ctx = document.getElementById('wasteChart').getContext('2d');
if(wasteChartInstance) wasteChartInstance.destroy();
wasteChartInstance = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Current Packaging', 'Proposed Packaging'],
datasets: [{
label: 'Total Annual Waste (lbs)',
data: [currentWeight * 0.00220462, proposedWeight * 0.00220462],
backgroundColor: ['rgba(239, 68, 68, 0.6)', 'rgba(22, 163, 74, 0.6)'],
borderColor: ['rgba(239, 68, 68, 1)', 'rgba(22, 163, 74, 1)'],
borderWidth: 1
}]
},
options: { responsive: true, maintainAspectRatio: false, scales: { y: { beginAtZero: true } } }
});
document.getElementById('download-pdf-btn').addEventListener('click', generatePdf);
};
const renderConfiguration = () => {
const configContent = document.getElementById('content-config');
if (!configContent) return;
const materialsHtml = appData.materials.map(mat => `
`).join('');
configContent.innerHTML = `
Manage Materials
${materialsHtml}
`;
lucide.createIcons();
document.getElementById('add-material-btn').addEventListener('click', () => {
document.getElementById('materials-list').insertAdjacentHTML('beforeend', `
`);
lucide.createIcons();
});
document.getElementById('materials-list').addEventListener('click', e => {
if (e.target.closest('.remove-material-btn')) {
e.target.closest('.material-row').remove();
}
});
document.getElementById('save-config-btn').addEventListener('click', handleConfigSave);
};
const handleConfigSave = () => {
const newMaterials = [];
let nextId = Math.max(0, ...appData.materials.map(m => m.id)) + 1;
document.querySelectorAll('.material-row').forEach(row => {
const name = row.querySelector('[data-field="name"]').value;
if (!name) return;
const id = row.classList.contains('is-new') ? nextId++ : parseInt(row.dataset.id);
newMaterials.push({ id, name });
});
appData.materials = newMaterials;
alert('Materials saved!');
renderCalculator(); // Redraw calculator to update dropdowns
};
const generatePdf = () => {
if (!calculationResult) return;
loadingOverlay.style.display = 'flex';
const { jsPDF } = window.jspdf;
const pdfContent = document.getElementById('pdf-content-area');
document.getElementById('pdf-generated-date').textContent = new Date().toLocaleDateString();
document.getElementById('pdf-header').classList.remove('hidden');
html2canvas(pdfContent, { scale: 2, useCORS: true })
.then(canvas => {
document.getElementById('pdf-header').classList.add('hidden');
const imgData = canvas.toDataURL('image/jpeg', 0.95);
const pdf = new jsPDF({ orientation: 'p', unit: 'px', format: 'a4' });
const pdfWidth = pdf.internal.pageSize.getWidth();
const pdfHeight = (canvas.height * pdfWidth) / canvas.width;
pdf.addImage(imgData, 'JPEG', 0, 0, pdfWidth, pdfHeight);
pdf.save(`Packaging-Waste-Report.pdf`);
loadingOverlay.style.display = 'none';
}).catch(err => {
console.error("PDF generation failed:", err);
document.getElementById('pdf-header').classList.add('hidden');
loadingOverlay.style.display = 'none';
alert('An error occurred generating the PDF.');
});
};
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: 'Waste Calculator', id: 'calculator' },
{ name: 'Material Configuration', id: 'config' }
];
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));
});
renderCalculator();
renderConfiguration();
switchTab(0);
lucide.createIcons();
document.getElementById('calculate-btn').addEventListener('click', handleCalculation);
};
initializeUI();
prevTabBtn.addEventListener('click', () => { if (activeTabIndex > 0) switchTab(activeTabIndex - 1); });
nextTabBtn.addEventListener('click', () => { if (activeTabIndex < tabIdentifiers.length - 1) switchTab(activeTabIndex + 1); });
});
