BuddyPress.org

WordPress Version 4.1
BuddyPress Version Version 2.1.1

I am new to buddypress and i am using the latest version. I have a custom post type called rewards and it has a custom taxonomy with it. I have created groups which matching names respective to the rewards taxonomy. Every time a new reward is create it will have one or more “groups” associated with them.

Now the following code works on the member’s main activity feed.

/* Tell Buddypress to add Rewards to activity stream */
function activity_publish_custom_post_types($post_types)
{
    $post_types[] = 'rewards';
    return $post_types;
    
}
add_filter('bp_blogs_record_post_post_types', 'activity_publish_custom_post_types',1);

/* Filter for action for post type reward*/
function rewards_activity_action($activity_action, $post, $post_permalink)
{
    global $bp;
    if ($post->post_type == 'rewards') {
        
        $activity_action = sprintf(__('%1$s posted a new reward : %2$s', 'buddypress'), bp_core_get_userlink((int) $post->post_author), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>');
       return $activity_action; 
    }
   
}

add_filter('bp_blogs_activity_new_post_action', 'rewards_activity_action', 1, 3);
add_filter('bp_activity_before_save', 'rewards_activity_content', 3);

/* Filter for content for post type reward before saved to database */
function rewards_activity_content($activity){

    global $post;

    if ($post->post_type == 'rewards') {

        $activity_id = (int) $activity->id;
        $post_id = (int) $activity->secondary_item_id;
        $user_id = (int) $activity->user_id;
      
        $post_type = get_post_type( $post_id );
        $thumbnail = get_the_post_thumbnail($post_id);

        
        $activity_content  = "<div class='post-id'>The post ID : {$post_id}</div>\n";
        $activity_content = "<div class='thumbnail'>{$thumbnail}</div>\n";
        $activity->content = $activity_content;

    }
}

My questions :-

1. within the rewards_activity_content function I cannot add the custom activity action name as such shown below

$activity->action = sprintf(__('%1$s posted a new reward : %2$s', 'buddypress'), bp_core_get_userlink((int) $post->post_author), '<a href="' . $post_permalink . '">' . $post->post_title . '</a>');

hence why i have created the rewards_activity_action function.

2. Based on the custom taxonomies that have been selected every time a new reward is created this needs to match the groups activity stream and a record needs to go in there for that particular group with the same
action and content name

Please tell me how I can acheive this