Fix catalog search result calculation

src/app/code/community/Dh/EmptyHandles/Model/Handler/Catalogsearch/Result/FilterFactory.php

@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * Factory class for instantiating filter models
+ *
+ * @category Dh
+ * @package Dh_EmptyHandles
+ * @author Geza Buza <[email protected]>
+ */
+class Dh_EmptyHandles_Model_Handler_Catalogsearch_Result_FilterFactory
+{
+    /** @var array $_filterModels Attribute to class map used for MySQL fulltext search */
+    protected $_filterModels = [
+        'category' => 'catalog/layer_filter_category',
+        'attribute' => 'catalog/layer_filter_attribute',
+        'price' => 'catalog/layer_filter_price',
+        'decimal' => 'catalog/layer_filter_decimal',
+    ];
+
+    /** @var array $_enterpriseFilterModels Attribute to class map used for Solr search */
+    protected $_enterpriseFilterModels = [
+        'category' => 'enterprise_search/catalog_layer_filter_category',
+        'attribute' => 'enterprise_search/catalog_layer_filter_attribute',
+        'price' => 'enterprise_search/catalog_layer_filter_price',
+        'decimal' => 'enterprise_search/catalog_layer_filter_decimal',
+    ];
+
+    /**
+     * Create a filter model for the given attribute
+     *
+     * @param Mage_Catalog_Model_Resource_Eav_Attribute $attribute
+     * @throws RuntimeException Thrown when No filter model is defined for the given attribute
+     *
+     * @return Mage_Catalog_Model_Layer_Filter_Abstract
+     */
+    public function create(Mage_Catalog_Model_Resource_Eav_Attribute $attribute)
+    {
+        $keys = [$attribute->getAttributeCode(), $attribute->getBackendType(), 'attribute'];
+        $classMap = $this->_getClassMap();
+
+        foreach ($keys as $key) {
+            if (isset($classMap[$key])) {
+                return Mage::getModel($classMap[$key]);
+            }
+        }
+
+        throw new RuntimeException(sprintf('Filter model is not defined for "%s" attribute', $attribute->getName()));
+    }
+
+    /**
+     * @return array
+     */
+    protected function _getClassMap()
+    {
+        $hasEnterpriseSearchModule = Mage::helper('core')->isModuleEnabled('Enterprise_Search');
+        return $hasEnterpriseSearchModule && Mage::helper('enterprise_search')->getIsEngineAvailableForNavigation()
+            ? $this->_enterpriseFilterModels
+            : $this->_filterModels;
+    }
+}

src/app/code/community/Dh/EmptyHandles/Model/Handler/Catalogsearch/Result/Index.php

@@ -19,10 +19,34 @@ class Dh_EmptyHandles_Model_Handler_Catalogsearch_Result_Index
      */
 	public function execute(Varien_Event $event)
 	{
-		$numResults = (bool)Mage::helper('catalogsearch')->getQuery()->getNumResults();
+		$numResults = $this->_getLayer()->getProductCollection()->getSize();
 		if (! $numResults) {
 			$this->_addHandle('catalogsearch_result_index_empty');
 		}
 		return $this;
 	}
+
+    /**
+     * Load the layer model with navigation layer filters applied on it
+     *
+     * @return Mage_Catalog_Model_Layer
+     */
+    protected function _getLayer()
+    {
+        $layer = Mage::registry('current_layer');
+        $factory = $this->_getFilterModelFactory();
+        foreach ($layer->getFilterableAttributes() as $attribute) {
+            $filterModel = $factory->create($attribute);
+            $filterModel
+                ->setLayer($layer)
+                ->setAttributeModel($attribute)
+                ->apply(Mage::app()->getRequest(), null);
+        }
+        return $layer;
+    }
+
+    protected function _getFilterModelFactory()
+    {
+        return Mage::getModel('emptyhandles/handler_catalogsearch_result_filterFactory');
+    }
 }