bp_media_messages_save_group_data( $message )

function bp_media_messages_save_group_data( &$message ) {

	if ( false === bp_disable_group_messages() ) {
		return;
	}

	$group                   = ( isset( $_POST ) && isset( $_POST['group'] ) && '' !== $_POST['group'] ) ? trim( $_POST['group'] ) : ''; // Group id.
	$message_users           = ( isset( $_POST ) && isset( $_POST['users'] ) && '' !== $_POST['users'] ) ? trim( $_POST['users'] ) : ''; // all - individual.
	$message_type            = ( isset( $_POST ) && isset( $_POST['type'] ) && '' !== $_POST['type'] ) ? trim( $_POST['type'] ) : ''; // open - private.
	$message_meta_users_list = ( isset( $_POST ) && isset( $_POST['message_meta_users_list'] ) && '' !== $_POST['message_meta_users_list'] ) ? trim( $_POST['message_meta_users_list'] ) : ''; // users list.
	$thread_type             = ( isset( $_POST ) && isset( $_POST['message_thread_type'] ) && '' !== $_POST['message_thread_type'] ) ? trim( $_POST['message_thread_type'] ) : ''; // new - reply.

	if ( '' === $message_meta_users_list && isset( $group ) && '' !== $group ) {
		$args = array(
			'per_page'            => 99999999999999,
			'group'               => $group,
			'exclude'             => array( bp_loggedin_user_id() ),
			'exclude_admins_mods' => false,
		);

		$group_members           = groups_get_group_members( $args );
		$members                 = wp_list_pluck( $group_members['members'], 'ID' );
		$message_meta_users_list = implode( ',', $members );
	}

	if ( isset( $group ) && '' !== $group ) {
		$thread_key = 'group_message_thread_id_' . $message->thread_id;
		bp_messages_update_meta( $message->id, 'group_id', $group );
		bp_messages_update_meta( $message->id, 'group_message_users', $message_users );
		bp_messages_update_meta( $message->id, 'group_message_type', $message_type );
		bp_messages_update_meta( $message->id, 'group_message_thread_type', $thread_type );
		bp_messages_update_meta( $message->id, 'group_message_fresh', 'yes' );
		bp_messages_update_meta( $message->id, $thread_key, $group );
		bp_messages_update_meta( $message->id, 'message_from', 'group' );
		bp_messages_update_meta( $message->id, 'message_sender', bp_loggedin_user_id() );
		bp_messages_update_meta( $message->id, 'message_users_ids', $message_meta_users_list );
		bp_messages_update_meta( $message->id, 'group_message_thread_id', $message->thread_id );
	} else {

		$args = array(
			'thread_id' => $message->thread_id,
			'per_page'  => 99999999999999,
		);

		if ( bp_thread_has_messages( $args ) ) {
			while ( bp_thread_messages() ) :
				bp_thread_the_message();

				$message_id    = bp_get_the_thread_message_id();
				$group         = bp_messages_get_meta( $message_id, 'group_id', true );
				$message_users = bp_messages_get_meta( $message_id, 'group_message_users', true );
				$message_type  = bp_messages_get_meta( $message_id, 'group_message_type', true );
				$thread_type   = bp_messages_get_meta( $message_id, 'group_message_thread_type', true );

				if ( $group ) {
					break;
				}
			endwhile;
		}

		if ( $group ) {

			$thread_key = 'group_message_thread_id_' . $message->thread_id;
			bp_messages_update_meta( $message->id, 'group_id', $group );
			bp_messages_update_meta( $message->id, 'group_message_users', $message_users );
			bp_messages_update_meta( $message->id, 'group_message_type', $message_type );
			bp_messages_update_meta( $message->id, 'group_message_thread_type', $thread_type );
			bp_messages_update_meta( $message->id, $thread_key, $group );
			bp_messages_update_meta( $message->id, 'message_sender', bp_loggedin_user_id() );
			bp_messages_update_meta( $message->id, 'message_from', 'personal' );
			bp_messages_update_meta( $message->id, 'group_message_thread_id', $message->thread_id );
		}
	}

}