/**
* Saves the like of an object.
*
* @param \wcf\data\like\object\ILikeObject $likeable
* @param \wcf\data\user\User $user
* @param integer $likeValue
* @param integer $time
* @return array
*/
public function like(ILikeObject $likeable, User $user, $likeValue, $time = TIME_NOW)
{
// verify if object is already liked by user
$like = Like::getLike($likeable->getObjectType()->objectTypeID, $likeable->getObjectID(), $user->userID);
// get like object
$likeObject = LikeObject::getLikeObject($likeable->getObjectType()->objectTypeID, $likeable->getObjectID());
// if vote is identically just revert the vote
if ($like->likeID && $like->likeValue == $likeValue) {
return $this->revertLike($like, $likeable, $likeObject, $user);
}
try {
WCF::getDB()->beginTransaction();
// like data
$cumulativeLikes = 0;
$newValue = $oldValue = null;
$users = array();
// update existing object
if ($likeObject->likeObjectID) {
$likes = $likeObject->likes;
$dislikes = $likeObject->dislikes;
$cumulativeLikes = $likeObject->cumulativeLikes;
// previous (dis-)like already exists
if ($like->likeID) {
$oldValue = $like->likeValue;
// revert like and replace it with a dislike
if ($like->likeValue == Like::LIKE) {
$likes--;
$dislikes++;
$cumulativeLikes -= 2;
$newValue = Like::DISLIKE;
} else {
// revert dislike and replace it with a like
$likes++;
$dislikes--;
$cumulativeLikes += 2;
$newValue = Like::LIKE;
}
} else {
if ($likeValue == Like::LIKE) {
$likes++;
$cumulativeLikes++;
$newValue = Like::LIKE;
} else {
$dislikes++;
$cumulativeLikes--;
$newValue = Like::DISLIKE;
}
}
// build update date
$updateData = array('likes' => $likes, 'dislikes' => $dislikes, 'cumulativeLikes' => $cumulativeLikes);
if ($likeValue == 1) {
$users = unserialize($likeObject->cachedUsers);
if (count($users) < 3) {
$users[$user->userID] = array('userID' => $user->userID, 'username' => $user->username);
$updateData['cachedUsers'] = serialize($users);
}
} else {
if ($likeValue == -1) {
$users = unserialize($likeObject->cachedUsers);
if (isset($users[$user->userID])) {
unset($users[$user->userID]);
$updateData['cachedUsers'] = serialize($users);
}
}
}
// update data
$likeObjectEditor = new LikeObjectEditor($likeObject);
$likeObjectEditor->update($updateData);
} else {
$cumulativeLikes = $likeValue;
$newValue = $likeValue;
$users = array();
if ($likeValue == 1) {
$users = array($user->userID => array('userID' => $user->userID, 'username' => $user->username));
}
// create cache
$likeObject = LikeObjectEditor::create(array('objectTypeID' => $likeable->getObjectType()->objectTypeID, 'objectID' => $likeable->getObjectID(), 'objectUserID' => $likeable->getUserID() ?: null, 'likes' => $likeValue == Like::LIKE ? 1 : 0, 'dislikes' => $likeValue == Like::DISLIKE ? 1 : 0, 'cumulativeLikes' => $cumulativeLikes, 'cachedUsers' => serialize($users)));
}
// update owner's like counter
if ($likeable->getUserID()) {
if ($like->likeID) {
$userEditor = new UserEditor(new User($likeable->getUserID()));
$userEditor->updateCounters(array('likesReceived' => $like->likeValue == Like::LIKE ? -1 : 1));
} else {
if ($likeValue == Like::LIKE) {
$userEditor = new UserEditor(new User($likeable->getUserID()));
$userEditor->updateCounters(array('likesReceived' => 1));
}
}
}
if (!$like->likeID) {
// save like
$like = LikeEditor::create(array('objectID' => $likeable->getObjectID(), 'objectTypeID' => $likeable->getObjectType()->objectTypeID, 'objectUserID' => $likeable->getUserID() ?: null, 'userID' => $user->userID, 'time' => $time, 'likeValue' => $likeValue));
if ($likeValue == Like::LIKE && $likeable->getUserID()) {
UserActivityPointHandler::getInstance()->fireEvent('com.woltlab.wcf.like.activityPointEvent.receivedLikes', $like->likeID, $likeable->getUserID());
$likeable->sendNotification($like);
}
} else {
$likeEditor = new LikeEditor($like);
$likeEditor->update(array('time' => $time, 'likeValue' => $likeValue));
if ($likeable->getUserID()) {
if ($likeValue == Like::DISLIKE) {
UserActivityPointHandler::getInstance()->removeEvents('com.woltlab.wcf.like.activityPointEvent.receivedLikes', array($likeable->getUserID() => 1));
} else {
UserActivityPointHandler::getInstance()->fireEvent('com.woltlab.wcf.like.activityPointEvent.receivedLikes', $like->likeID, $likeable->getUserID());
$likeable->sendNotification($like);
}
}
}
// update object's like counter
$likeable->updateLikeCounter($cumulativeLikes);
WCF::getDB()->commitTransaction();
} catch (DatabaseException $e) {
WCF::getDB()->rollBackTransaction();
}
return array('data' => $this->loadLikeStatus($likeObject, $user), 'like' => $like, 'newValue' => $newValue, 'oldValue' => $oldValue, 'users' => $users);
}
