document number sequence

app/assets/utils/classes/PurchaseRequestManager.php

@@ -1,4 +1,5 @@
 <?php
+require_once __DIR__ . '/DocumentNumberManager.php';
 require_once __DIR__ . '/../classes_ac/PostingWindowGuard.php';
 
 /**
@@ -31,18 +32,10 @@ class PurchaseRequestManager
     // Private helpers
     // ─────────────────────────────────────────────────────────────
 
-    private function generateNumber(): string
+    private function generateNumber(array $data = []): string
     {
-        $prefix = 'PR-' . date('Ym') . '-';
-        $sth = $this->pdo->prepare(
-            "SELECT request_number FROM td_purchase_request
-             WHERE company_id = :cid AND request_number LIKE :prefix
-             ORDER BY request_number DESC LIMIT 1"
-        );
-        $sth->execute([':cid' => $this->company_id, ':prefix' => $prefix . '%']);
-        $last = $sth->fetchColumn();
-        $seq  = $last ? ((int)substr($last, -4) + 1) : 1;
-        return $prefix . str_pad($seq, 4, '0', STR_PAD_LEFT);
+        return (new DocumentNumberManager($this->pdo, $this->company_id))
+            ->resolveNumber($data, 'purchase_request', 'td_purchase_request', 'request_number');
     }
 
     /**
@@ -176,7 +169,7 @@ class PurchaseRequestManager
         [$subtotal, $tax, $grand] = $this->computeTotals($items, $discount, $shipping_fee);
 
         if ($id === 0) {
-            $number = $this->generateNumber();
+            $number = $this->generateNumber($data);
             $log    = [array_merge($logging, ['action' => 'create_purchase_request'])];
 
             $this->pdo->prepare(