fixes #1381 orphans calculation is done only when needed by ajax call

include/ws_functions/pwg.php

@@ -555,4 +555,116 @@ SELECT
   fclose($f);
 }
 
+
+/**
+ * API method
+ * Return the number of orphan photos if an album is deleted
+ */
+
+function ws_images_calculateOrphansOnAlbumDeletion($param, &$service)
+{
+  global $conf;
+
+  $category_id = $param['category_id'][0];
+
+  $query = '
+SELECT DISTINCT 
+    category_id
+  FROM 
+    '.IMAGE_CATEGORY_TABLE.'
+  WHERE 
+    category_id = '.$category_id.'
+  LIMIT 1';
+  $result = pwg_query($query);
+  $category['has_images'] = pwg_db_num_rows($result)>0 ? true : false;
+
+  // number of sub-categories
+  $subcat_ids = get_subcat_ids(array($category_id));
+
+  $category['nb_subcats'] = count($subcat_ids) - 1;
+
+  // total number of images under this category (including sub-categories)
+  $query = '
+SELECT DISTINCT
+    (image_id)
+  FROM 
+    '.IMAGE_CATEGORY_TABLE.'
+  WHERE 
+    category_id IN ('.implode(',', $subcat_ids).')
+  ;';
+  $image_ids_recursive = query2array($query, null, 'image_id');
+
+  $category['nb_images_recursive'] = count($image_ids_recursive);
+
+  // number of images that would become orphan on album deletion
+  $category['nb_images_becoming_orphan'] = 0;
+  $category['nb_images_associated_outside'] = 0;
+
+  if ($category['nb_images_recursive'] > 0)
+  {
+    // if we don't have "too many" photos, it's faster to compute the orphans with MySQL
+    if ($category['nb_images_recursive'] < 1000)
+    {
+      $query = '
+  SELECT DISTINCT
+      (image_id)
+    FROM 
+      '.IMAGE_CATEGORY_TABLE.'
+    WHERE 
+      category_id 
+    NOT IN 
+      ('.implode(',', $subcat_ids).')
+    AND 
+      image_id 
+    IN 
+      ('.implode(',', $image_ids_recursive).')
+  ;';
+
+    $image_ids_associated_outside = query2array($query, null, 'image_id');
+    $category['nb_images_associated_outside'] = count($image_ids_associated_outside);
+
+    $image_ids_becoming_orphan = array_diff($image_ids_recursive, $image_ids_associated_outside);
+    $category['nb_images_becoming_orphan'] = count($image_ids_becoming_orphan);
+  }
+  // else it's better to avoid sending a huge SQL request, we compute the orphan list with PHP
+    else
+    {
+    $image_ids_recursive_keys = array_flip($image_ids_recursive);
+
+    $query = '
+  SELECT
+      image_id
+    FROM 
+      '.IMAGE_CATEGORY_TABLE.'
+    WHERE 
+      category_id 
+    NOT IN 
+      ('.implode(',', $subcat_ids).')
+  ;';
+    $image_ids_associated_outside = query2array($query, null, 'image_id');
+    $image_ids_not_orphan = array();
+
+    foreach ($image_ids_associated_outside as $image_id)
+    {
+      if (isset($image_ids_recursive_keys[$image_id]))
+      {
+        $image_ids_not_orphan[] = $image_id;
+      }
+    }
+
+    $category['nb_images_associated_outside'] = count(array_unique($image_ids_not_orphan));
+    $image_ids_becoming_orphan = array_diff($image_ids_recursive, $image_ids_not_orphan);
+    $category['nb_images_becoming_orphan'] = count($image_ids_becoming_orphan);
+  }
+}
+
+  $output[] = array(
+    'nb_images_associated_outside' => $category['nb_images_associated_outside'],
+    'nb_images_becoming_orphan' => $category['nb_images_becoming_orphan'],
+    'nb_images_recursive' => $category['nb_images_recursive'],
+  );
+  
+  return $output;
+}
+
 ?>