From 27aa4e0ea6bc0de92bd42e3035f2bc6ab04aa08e Mon Sep 17 00:00:00 2001
From: Scott Pouliot <spouliot@scppowdercoating.com>
Date: Sat, 16 May 2026 11:41:47 -0400
Subject: [PATCH] Invoice create: show discount row in totals, allow negative
 line items

- Add "Discount Applied" display row (red, hidden when zero) between subtotal
  and tax so users can see the discount being deducted at a glance
- Remove min="0" from UnitPrice and TotalPrice inputs (server-rendered and JS
  template) so negative adjustment lines can be entered without form rejection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../Views/Invoices/Create.cshtml              | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/PowderCoating.Web/Views/Invoices/Create.cshtml b/src/PowderCoating.Web/Views/Invoices/Create.cshtml
index 44e67e5..fbc8ccc 100644
--- a/src/PowderCoating.Web/Views/Invoices/Create.cshtml
+++ b/src/PowderCoating.Web/Views/Invoices/Create.cshtml
@@ -283,13 +283,13 @@
                                         <td class="text-end">
                                             <input type="number" name="InvoiceItems[@i].UnitPrice"
                                                    class="form-control form-control-sm text-end unit-price-input"
-                                                   value="@item.UnitPrice.ToString("F2")" min="0" step="0.01"
+                                                   value="@item.UnitPrice.ToString("F2")" step="0.01"
                                                    onchange="recalcRow(this)" oninput="recalcRow(this)" />
                                         </td>
                                         <td class="text-end">
                                             <input type="number" name="InvoiceItems[@i].TotalPrice"
                                                    class="form-control form-control-sm text-end total-price-input"
-                                                   value="@item.TotalPrice.ToString("F2")" min="0" step="0.01"
+                                                   value="@item.TotalPrice.ToString("F2")" step="0.01"
                                                    oninput="recalcTotals()" />
                                         </td>
                                         <td class="text-center">
@@ -371,6 +371,10 @@
                         <input asp-for="DiscountAmount" type="number" class="form-control form-control-sm text-end"
                                min="0" step="0.01" oninput="recalcTotals()" />
                     </div>
+                    <div id="discountRow" class="d-flex justify-content-between mb-1 d-none">
+                        <span class="text-muted small">Discount Applied</span>
+                        <span id="displayDiscount" class="small text-danger">&minus;$0.00</span>
+                    </div>
                     <div class="mb-2">
                         <div class="d-flex justify-content-between align-items-center mb-1">
                             <label class="form-label mb-0 text-muted">Tax (%)</label>
@@ -725,13 +729,13 @@
             <td class="text-end">
                 <input type="number" name="InvoiceItems[${idx}].UnitPrice"
                        class="form-control form-control-sm text-end unit-price-input"
-                       value="${unitPrice.toFixed(2)}" min="0" step="0.01"
+                       value="${unitPrice.toFixed(2)}" step="0.01"
                        onchange="recalcRow(this)" oninput="recalcRow(this)" />
             </td>
             <td class="text-end">
                 <input type="number" name="InvoiceItems[${idx}].TotalPrice"
                        class="form-control form-control-sm text-end total-price-input"
-                       value="${total}" min="0" step="0.01"
+                       value="${total}" step="0.01"
                        oninput="recalcTotals()" />
             </td>
             <td class="text-center">
@@ -797,6 +801,15 @@
         const total = taxableAmount + tax;
 
         document.getElementById('displaySubtotal').textContent = formatCurrency(subtotal);
+        const discountRow = document.getElementById('discountRow');
+        if (discountRow) {
+            if (discount > 0) {
+                document.getElementById('displayDiscount').textContent = '−' + formatCurrency(discount);
+                discountRow.classList.remove('d-none');
+            } else {
+                discountRow.classList.add('d-none');
+            }
+        }
         document.getElementById('displayTax').textContent = formatCurrency(tax);
         document.getElementById('displayTotal').textContent = formatCurrency(total);
     }