fix : change base img break when last image

app/code/Joshine/Script/Console/Command/ProductFirstImageAsBaseFixer.php

@@ -65,6 +65,12 @@ class ProductFirstImageAsBaseFixer extends Command
             return;
         }
 
+        $lastImage = $this->imageQueryResource->getLastImage($productId);
+        if ($mainImage != $lastImage) {
+            $output->writeln('base image not last, break');
+            return;
+        }
+
         if ($mainImage != $firstImage) {
             $output->writeln('fix product ' . $mainImage . ' product id: ' . $productId);
             //change main image

app/code/Joshine/Script/Model/ImageQueryResource.php

@@ -109,4 +109,23 @@ class ImageQueryResource
         );
     }
 
+    public function getLastImage($productId)
+    {
+        $select = $this->resourceConnection->getConnection()->select();
+        $select->from(['v' => $this->resourceConnection->getTableName('catalog_product_entity_media_gallery_value')]);
+        $select->join(
+            ['g' => 'catalog_product_entity_media_gallery'],
+            'g.value_id=v.value_id',
+            []
+        );
+
+        $select->where('entity_id=?', $productId);
+        $select->reset(\Magento\Framework\DB\Select::COLUMNS);
+        $select->columns(['g.value', 'v.position']);
+        $select->order('v.position  DESC');
+        $select->limit(1);
+
+        return $this->resourceConnection->getConnection()->fetchOne($select);
+    }
+
 }
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