added transaction number interface

app/Utilities/TransactionNumber.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Utilities;
+
+use App\Interfaces\Utility\TransactionNumber as TransactionNumberInterface;
+use App\Models\Banking\Transaction;
+use App\Models\Common\Contact;
+
+class TransactionNumber implements TransactionNumberInterface
+{
+    public function getNextNumber($suffix = '', ?Contact $contact): string
+    {
+        $prefix = setting('transaction' . $suffix . '.number_prefix');
+        $next   = (string) setting('transaction' . $suffix . '.number_next');
+        $digit  = (int) setting('transaction' . $suffix . '.number_digit');
+
+        $get_number = fn($prefix, $next, $digit) => $prefix . str_pad($next, $digit, '0', STR_PAD_LEFT);
+        $number_exists = fn($number) => Transaction::where('number', $number)->exists();
+
+        $transaction_number = $get_number($prefix, $next, $digit);
+
+        if ($number_exists($transaction_number)) {
+            do {
+                $next++;
+
+                $transaction_number = $get_number($prefix, $next, $digit);
+            } while ($number_exists($transaction_number));
+
+            setting(['transaction' . $suffix . '.number_next' => $next]);
+            setting()->save();
+        }
+
+        return $transaction_number;
+
+    }
+
+    public function increaseNextNumber($suffix = '', ?Contact $contact): void
+    {
+        $next = setting('transaction' . $suffix . '.number_next', 1) + 1;
+
+        setting(['transaction' . $suffix . '.number_next' => $next]);
+        setting()->save();
+    }
+}