invoice no : GWM

app/Controllers/InvoiceController.php

@@ -99,7 +99,6 @@ class InvoiceController extends ResourceController
 
             // Basic invoice data
             $invoiceData = [
-                'invoice_no'     => $input['invoice_no'] ?? '',
                 'invoice_amount' => $input['invoice_amount'] ?? 0,
                 'broker_id'      => $input['broker_id'] ?? 0,
                 'pos_id'         => $input['pos_id'] ?? 0,
@@ -115,6 +114,9 @@ class InvoiceController extends ResourceController
 
             if (!$invoiceId) {
 
+                //  Generate invoice number only for CREATE
+                $invoiceData['invoice_no'] = $this->generateInvoiceNo();
+
                 $invoiceData['created_at'] = date('Y-m-d H:i:s');
                 $invoiceData['created_by'] = $input['created_by'] ?? 0;
 
@@ -123,6 +125,10 @@ class InvoiceController extends ResourceController
                 if (!$invoiceId) { throw new DataException("Failed to create invoice"); }
 
             } else {
+
+                // Invoice number should NOT change on update
+                unset($invoiceData['invoice_no']);
+                
                 $this->InvoiceModel->update($invoiceId, $invoiceData);
             }
 
@@ -175,6 +181,30 @@ class InvoiceController extends ResourceController
         }
     }
 
+    private function generateInvoiceNo()
+    {
+        $year = date('Y');
+        $prefix = "INV/$year/";
+
+        // Get last invoice of current year
+        $lastInvoice = $this->InvoiceModel
+            ->select('invoice_no')
+            ->like('invoice_no', $prefix, 'after')
+            ->orderBy('id', 'DESC')
+            ->first();
+
+        if ($lastInvoice && isset($lastInvoice['invoice_no'])) {
+            // Extract numeric part
+            $lastNumber = intval(substr($lastInvoice['invoice_no'], -5));
+            $nextNumber = $lastNumber + 1;
+        } else {
+            $nextNumber = 1;
+        }
+
+        return $prefix . str_pad($nextNumber, 5, '0', STR_PAD_LEFT);
+    }
+
+
     public function deleteInvoice()
     {
         try {