fixed warehouse article

application/WarehouseArticle/WarehouseArticleController.php

@@ -56,12 +56,16 @@ class WarehouseArticleController extends TTCrud {
     protected function beforeCreate() {
         if (!in_array($this->user->id, [2, 5, 6, 145, 14]))
             self::sendError("Sie haben keine Berechtigung, Artikel zu erstellen.");
+
+        $this->validateArticleNumber($_POST);
         return true;
     }
 
     protected function beforeUpdate($postData): bool {
         if (!in_array($this->user->id, [2, 5, 6, 145, 14]))
             self::sendError("Sie haben keine Berechtigung, Artikel zu bearbeiten.");
+
+        $this->validateArticleNumber($postData, $postData['id'] ?? null);
         (new WarehouseHistoryController)->create($postData, $this->mod);
         return true;
     }
@@ -84,6 +88,38 @@ class WarehouseArticleController extends TTCrud {
         self::updateSellPrices($postData['id']);
     }
 
+    /**
+     * Validate article number for duplicates and correct category prefix
+     */
+    private function validateArticleNumber(array $postData, ?int $excludeId = null): void {
+        $articleNumber = $postData['articleNumber'] ?? '';
+        $categoryId = $postData['category_id'] ?? null;
+
+        if (empty($articleNumber)) {
+            self::sendError("Artikelnummer ist erforderlich.");
+        }
+
+        // Check for duplicate article number
+        $existingArticles = WarehouseArticleModel::getAll(['articleNumber' => $articleNumber]);
+        foreach ($existingArticles as $existing) {
+            if ($excludeId === null || $existing->id != $excludeId) {
+                self::sendError("Artikelnummer '{$articleNumber}' existiert bereits (Artikel ID: {$existing->id}).");
+            }
+        }
+
+        // Validate category prefix
+        if ($categoryId) {
+            $category = WarehouseCategory::get($categoryId);
+            if ($category && $category->articleNumberPrefix) {
+                $expectedPrefix = $category->articleNumberPrefix;
+                $articlePrefix = substr($articleNumber, 0, strlen($expectedPrefix));
+                if ($articlePrefix !== $expectedPrefix) {
+                    self::sendError("Artikelnummer muss mit dem Kategorie-Prefix '{$expectedPrefix}' beginnen.");
+                }
+            }
+        }
+    }
+
     public static function updateSellPrices(int $id): void { // Added return type hint
         $a = WarehouseArticleModel::get($id);
         if (!$a instanceof WarehouseArticleModel) throw new Exception("Invalid article type");