generate bill number

app/Traits/Purchases.php

@@ -4,6 +4,33 @@ namespace App\Traits;
 
 trait Purchases
 {
+    /**
+     * Generate next bill number
+     *
+     * @return string
+     */
+    public function getNextBillNumber()
+    {
+        $prefix = setting('bill.number_prefix', 'BIL-');
+        $next = setting('bill.number_next', '1');
+        $digit = setting('bill.number_digit', '5');
+
+        $number = $prefix . str_pad($next, $digit, '0', STR_PAD_LEFT);
+
+        return $number;
+    }
+
+    /**
+     * Increase the next bill number
+     */
+    public function increaseNextBillNumber()
+    {
+        $next = setting('bill.number_next', 1) + 1;
+
+        setting(['bill.number_next' => $next]);
+        setting()->save();
+    }
+
     /**
      * Get a collection of bill statuses
      *