--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/og_statistics.faceted_search.inc	Tue Nov 24 14:25:13 2009 +0100
@@ -0,0 +1,45 @@
+<?php
+// $Id: og_statistics.faceted_search.inc,v 1.2 2009/05/29 16:46:25 dereine Exp $
+
+/**
+ * @file
+ *   Integration of og_statistics into faceted_search.
+ */
+
+/**
+ * Implementation of hook_form_alter().
+ */
+function og_statistics_form_faceted_search_edit_form_alter(&$form, &$form_state) {
+  $env_id = $form['env_id']['#value'];
+  //    drupal_set_message('Faceted_search alter :'.var_export($form['info'], true));
+  $form['info']['name']['#weight'] = -5;
+  $form['info']['title']['#weight'] = -4;
+  $form['info']['description']['#weight'] = -3;
+  $form['info']['types']['#weight'] = -2;
+  $form['info']['og_statistics_sort'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Sort by number of group nodes'),
+    '#default_value' => faceted_search_variable_get($env_id, 'og_statistics_sort', FALSE),
+    '#description' => t('If <em>only</em> searching group content types enables sorting by the most recent node added to the group, rather than comment added to the group node itself.'),
+    '#weight' => -1,
+  );
+}
+}
+
+/**
+ * Implementation of hook_faceted_search_query_alter().
+ *
+ * This is quite late in the sequence, but were altering a facet
+ * (the content-type one) rather than making a new one we could hook
+ * in the sort(s) to. 
+ * @todo I guess there is a much better way of doing this! Like
+ * maybe inheriting content-type facet and extending it and making it
+ * sort an option?
+ */
+function og_statistics_faceted_search_query_alter($search, &$query) {
+  if (faceted_search_variable_get($search->_env_id, 'og_statistics_sort', FALSE)) { // change for a variable
+    $query->tables['default']['c']['table'] = 'og_statistics';
+    $query->fields['default']['score']['field'] = '%d * POW(2, (GREATEST(MAX(n.created), MAX(n.changed), MAX(c.last_node_timestamp)) - %d) * 6.43e-8)';
+  }
+}
+