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// Discount functions for billing system function toggleDiscountInput() { const userRole = localStorage.getItem('role'); const discountAllowed = ['Admin', 'Manager'].includes(userRole); const discountGroup = document.getElementById('discountGroup'); if (discountAllowed) { discountGroup.style.display = 'block'; } else { discountGroup.style.display = 'none'; clearDiscount(); } } function updateDiscountAmount() { const discountPercentageInput = document.getElementById('discountPercentage'); const discountAmountDisplay = document.getElementById('discountAmountDisplay'); const subtotal = cart.reduce((sum, item) => sum + (item.quantity * item.unit_price), 0); if (!discountPercentageInput.value) { discountAmountDisplay.textContent = ''; updateBillSummary(); return; } const discountPercentage = parseFloat(discountPercentageInput.value); if (discountPercentage < 0 || discountPercentage > 100) { app.showNotification('Discount percentage must be between 0 and 100', 'error'); discountPercentageInput.value = ''; discountAmountDisplay.textContent = ''; updateBillSummary(); return; } const discountAmount = subtotal * (discountPercentage / 100); discountAmountDisplay.textContent = `-${app.formatCurrency(discountAmount)}`; updateBillSummary(); } function clearDiscount() { document.getElementById('discountPercentage').value = ''; document.getElementById('discountAmountDisplay').textContent = ''; updateBillSummary(); } function getManualDiscount() { const discountPercentageInput = document.getElementById('discountPercentage'); if (!discountPercentageInput.value) return { percentage: 0, amount: 0 }; const subtotal = cart.reduce((sum, item) => sum + (item.quantity * item.unit_price), 0); const discountPercentage = parseFloat(discountPercentageInput.value); const discountAmount = subtotal * (discountPercentage / 100); return { percentage: discountPercentage, amount: discountAmount }; }
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