Allow enable discount percentage filter

Author: vahonc

src/module-elasticsuite-catalog/Api/Layer/Filter/TypeProviderInterface.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade Smile ElasticSuite to newer versions in the future.
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCatalog
+ * @author    Vadym Honcharuk <vahonc@smile.fr>
+ * @copyright 2026 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCatalog\Api\Layer\Filter;
+
+use Magento\Catalog\Model\ResourceModel\Eav\Attribute;
+
+/**
+ * Filter type provider interface.
+ *
+ * @category Smile
+ * @package  Smile\ElasticsuiteCatalog
+ * @author   Vadym Honcharuk <vahonc@smile.fr>
+ */
+interface TypeProviderInterface
+{
+    /**
+     * Return filter class name.
+     *
+     * @param Attribute $attribute               The attribute model.
+     * @param string    $originalFilterClassName The original/default filter class name.
+     *
+     * @return string
+     */
+    public function getFilterClassName(Attribute $attribute, string $originalFilterClassName): string;
+}

src/module-elasticsuite-catalog/Model/Layer/FilterList.php

@@ -14,6 +14,11 @@
 
 namespace Smile\ElasticsuiteCatalog\Model\Layer;
 
+use Magento\Catalog\Model\Config\LayerCategoryConfig;
+use Magento\Catalog\Model\Layer\FilterableAttributeListInterface;
+use Magento\Framework\ObjectManagerInterface;
+use Smile\ElasticsuiteCatalog\Api\Layer\Filter\TypeProviderInterface;
+
 /**
  * FilterList customization to support decimal filters.
  *
@@ -28,6 +33,37 @@ class FilterList extends \Magento\Catalog\Model\Layer\FilterList
      */
     const BOOLEAN_FILTER = 'boolean';
 
+    /**
+     * @var TypeProviderInterface[]
+     */
+    private $filterTypeProviders;
+
+    /**
+     * Constructor.
+     *
+     * @param ObjectManagerInterface           $objectManager        Object manager.
+     * @param FilterableAttributeListInterface $filterableAttributes Filterable attributes list.
+     * @param LayerCategoryConfig              $layerCategoryConfig  Category layer config.
+     * @param array                            $filters              Core filters array.
+     * @param array                            $filterTypeProviders  Injected custom type providers.
+     */
+    public function __construct(
+        ObjectManagerInterface           $objectManager,
+        FilterableAttributeListInterface $filterableAttributes,
+        LayerCategoryConfig              $layerCategoryConfig,
+        array                            $filters = [],
+        array                            $filterTypeProviders = []
+    ) {
+        parent::__construct(
+            $objectManager,
+            $filterableAttributes,
+            $layerCategoryConfig,
+            $filters
+        );
+
+        $this->filterTypeProviders = $filterTypeProviders;
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -45,6 +81,13 @@ protected function getAttributeFilterClass(\Magento\Catalog\Model\ResourceModel\
             $filterClassName = $this->filterTypes[self::BOOLEAN_FILTER];
         }
 
+        // Allow injected providers to override the filter class.
+        foreach ($this->filterTypeProviders as $provider) {
+            if ($provider instanceof TypeProviderInterface) {
+                $filterClassName = $provider->getFilterClassName($attribute, $filterClassName);
+            }
+        }
+
         return $filterClassName;
     }
 }