BuddyPress.org

/**
* Plugin Name:BuddyPress Post Comment Notifier
* Description: Mod of Brajesh Singh's BuddyPress Activity Comment Notifier to work for Blog Post Comments
*
*/

// we are not much concerned with the slug, it is not visible
define("BP_COMMENT_NOTIFIER_SLUG","pc_notification");

//register a dummy notifier component, I don't want to do it, but bp has no other mechanism for passing the notification data to function, so we need the format_notification_function
function pc_notifier_setup_globals() {
global $bp, $current_blog;
$bp->pc_notifier=new stdClass();
$bp->pc_notifier->id = 'pc_notifier';//I asume others are not going to use this is
$bp->pc_notifier->slug = BP_COMMENT_NOTIFIER_SLUG;
$bp->pc_notifier->notification_callback = 'pc_notifier_format_notifications';//show the notification
/* Register this in the active components array */
$bp->active_components[$bp->pc_notifier->slug] = $bp->pc_notifier->id;

do_action( 'pc_notifier_setup_globals' );
}
add_action( 'bp_setup_globals', 'pc_notifier_setup_globals' );

/**
* storing notification for users
* notify all the users who have commented, or who was the original poster of the update, when someone comments
* hook to bp_blogs_comment_recorded action
*/
function pc_notifier_notify($activity_id) {
global $bp;

$activity = new BP_Activity_Activity($activity_id);
$comment = get_comment($activity->secondary_item_id);
$users = pc_notifier_find_involved_persons($comment->comment_post_ID);
$link = get_permalink($comment->comment_post_ID);

if($activity->hide_sitewide) return;

if(!in_array($activity->user_id, $users)&&($bp->loggedin_user->id!=$activity->user_id)) array_push ($users, $activity->user_id);

foreach((array)$users as $user_id){
bp_core_add_notification( $activity_id, $user_id, $bp->pc_notifier->id, 'new_post_comment_'.$activity_id );
}

}
add_action("bp_blogs_comment_recorded","pc_notifier_notify",10,1); // hook to bp_blogs_comment_recorded for adding notification

/** our notification format function which shows notification to user
*
* @global $bp
* @param $action
* @param $activity_id
* @param $secondary_item_id
* @param $total_items
* @return
* @since 1.0.2
* @desc format and show the notification to the user
*/
function pc_notifier_format_notifications( $action, $activity_id, $secondary_item_id, $total_items, $format='string' ) {

global $bp;
$glue = '';
$user_names = array();
$activity = new BP_Activity_Activity( $activity_id );
$comment = get_comment($activity->secondary_item_id);
$link = get_permalink($comment->comment_post_ID);
$comment_post = get_post($comment->comment_post_ID);

if ( $activity->user_id == $bp->loggedin_user->id ) $text = __("your post");
else $text = sprintf(__("%s"), $comment_post->post_title);

$pc_action = 'new_post_comment_'.$activity_id;

if ( $action == $pc_action ) {

$users = pc_notifier_find_involved_persons($comment->comment_post_ID);

$total_user = $count = count($users);//how many unique users have commented

if ( $count > 2 ) {
$users = array_slice($users, $count-2);//just show name of two poster, rest should be as and 'n' other also commeted
$count = $count-2;
$glue=", ";
}
else if ( $total_user == 2 ) $glue = " and ";//if there are 2 unique users , say x and y commented

foreach ( (array)$users as $user_id )
$user_names[] = bp_core_get_user_displayname($user_id);

if ( !empty($user_names) )
$commenting_users = join($glue,$user_names);

if ( $total_user > 2 )
$text = $commenting_users." and ".$count." others commented on ".$comment_post->post_title;
else
$text = $commenting_users." commented on ".$comment_post->post_title;

if ( $format == 'string' )
return apply_filters('bp_activity_multiple_new_comment_notification','comment_ID.'">'.$text.'');
else {
$link .= '#comment-'.$comment->comment_ID;
return array('link'=>$link,'text'=>$text);
}

}

return false;

}

/*
* Remove activity for the comments on new_blog_post & new_blog_comment activity item.
* Since these items do not have a single activity view and are linked to the single post screen, we will do the needed on single post view
*/

function pc_notifier_remove_notification_for_blog_posts(){
if( !( is_user_logged_in() && is_singular() ) )
return;

global $bp,$wpdb;
$blog_id = (int)$wpdb->blogid;
$post = wp_get_single_post();
$activity_id = bp_activity_get_activity_id(
array(
'user_id' => $post->post_author,
'component' => $bp->blogs->id,
'type' => "new_blog_post",
'item_id' => $blog_id,
'secondary_item_id' => $post->ID
)
);
//delete the notification for activity comment on new_blog_post
if( !empty($activity_id) )
bp_core_delete_notifications_by_item_id( $bp->loggedin_user->id, $activity_id, $bp->pc_notifier->id, 'new_post_comment_'.$activity_id );

//for replies on blog comments in activity stream
$comments = pc_notifier_get_all_blog_post_comment_ids($post->ID);//get all the comment ids as array

//added in v 1.0.3 for better database performance, no more looping to get individual activity ids
$activities = pc_notifier_get_activity_ids(
array(
"type"=>"new_blog_comment",
"component" => $bp->blogs->id,
"item_id"=>$blog_id,
"secondary_ids"=>$comments
)
);

foreach( (array)$activities as $pc_id )
bp_core_delete_notifications_by_item_id( $bp->loggedin_user->id, $pc_id, $bp->pc_notifier->id, 'new_post_comment_'.$pc_id );

}
add_action("wp_head","pc_notifier_remove_notification_for_blog_posts");

/**
* @since v 1.0.2
* @desc delete notification when an activity is deleted, thanks to @kat_uk for pointing the issue
* @param pc_ids:we get an arry of activity ids
*/
function bp_pc_clear_notification_on_activity_delete($pc_ids){
global $bp;

foreach ( (array)$pc_ids as $activity_id )
bp_core_delete_all_notifications_by_type( $activity_id, $bp->pc_notifier->id, 'new_post_comment_'.$activity_id, $secondary_item_id = false );
}
add_action("bp_activity_deleted_activities","bp_pc_clear_notification_on_activity_delete");

/************************************ HELPER FUNCTIONS ********************************************************/

// find all users who commented on the post
function pc_notifier_find_involved_persons($comment_post_ID){
global $bp,$wpdb;

return $wpdb->get_col($wpdb->prepare("SELECT DISTINCT(user_id) from {$wpdb->comments} where comment_post_ID=%d and user_id!=%d",$comment_post_ID,$bp->loggedin_user->id));
}

// return an array of comment ids for the post
function pc_notifier_get_all_blog_post_comment_ids($post_id) {
global $wpdb;

return $wpdb->get_col($wpdb->prepare("SELECT comment_ID as id FROM {$wpdb->comments} WHERE comment_post_ID = %d AND comment_approved = '1' ORDER BY comment_date", $post_id));
}

// get activity ids when type, component, secondary_ids, item_id is specified
function pc_notifier_get_activity_ids($params){
global $bp,$wpdb;
extract($params);
$list="(".join(",", $secondary_ids).")";//create a set to use in the query;

return $wpdb->get_col($wpdb->prepare("SELECT id from {$bp->activity->table_name} where type=%s and component=%s and item_id=%d and secondary_item_id in {$list}",$type,$component,$item_id));
}