/**
* Add a Newsfeed item.
*
* @static
* @param Model_User $user
* @param string $class e.g. 'user'
* @param string $type e.g. 'login'
* @param array $data Data to be user with item
* @return boolean
*/
protected static function add(Model_User $user, $class, $type, array $data = null)
{
$item = new Model_NewsfeedItem();
// Update item if previous added less than time window specified time
$update = DB::update($item->get_table_name())->set(array('stamp' => time()))->where('user_id', '=', $user->id)->and_where('class', '=', $class)->and_where('type', '=', $type)->and_where('stamp', '>', strtotime(Newsfeed::UPDATE_WINDOW));
$data ? $update->and_where('data', '=', @json_encode($data)) : $update->and_where('data', 'IS', null);
// Update any?
if ($update->execute()) {
return true;
}
// No new enough item found, insert
$item->set_fields(array('user_id' => $user->id, 'class' => $class, 'type' => $type, 'data' => $data, 'stamp' => time()));
$item->save();
return $item->loaded();
}
/**
* Aggregate repeating items, daily.
*
* @param Model_NewsfeedItem[] $items
* @return Model_NewsfeedItem[]
*/
protected function aggregate($items = null)
{
$aggregated = array();
$aggregate_types = array();
foreach ($items as $item) {
// Check if item type is aggregateable
$class = 'Newsfeeditem_' . $item->class;
if (!isset($aggregate_types[$class])) {
$aggregate_types[$class] = class_exists($class) ? Arr::get(get_class_vars($class), 'aggregate', array()) : array();
}
if (!in_array($item->type, $aggregate_types[$class])) {
// Not aggregateable
$aggregated[] = $item;
continue;
}
// Generate key
$key = $item->user_id . $item->class . $item->type . date('Ymd', $item->stamp);
if (isset($aggregated[$key])) {
// Aggregate to existing key
/** @var Model_NewsfeedItem $aggregate */
$aggregate = clone $aggregated[$key];
// Make it aggregated pseudo item if necessary
if (!$aggregate->is_aggregate()) {
$_aggregate = new Model_NewsfeedItem();
$_aggregate->is_aggregate(true);
$_aggregate->set_fields(array('user_id' => $aggregate->user_id, 'stamp' => $aggregate->stamp, 'class' => $aggregate->class, 'type' => $aggregate->type, 'data' => array(clone $aggregate)));
$aggregate = $_aggregate;
}
// Add current item
$data = $aggregate->data;
$duplicate = false;
foreach ($data as $_item) {
if ($_item->data == $item->data) {
$duplicate = true;
break;
}
}
if (!$duplicate) {
$data[] = $item;
$aggregate->data = $data;
$aggregated[$key] = $aggregate;
}
} else {
// New aggregateable key
$aggregated[$key] = $item;
}
}
return $aggregated;
}
