BP_Messages_Thread::get_messages( int $thread_id,  $before = null,  $perpage = 10 )

	public static function get_messages( $thread_id = 0, $before = null, $perpage = 10 ) {
		$thread_id = (int) $thread_id;
		$cache_key = "{$thread_id}{$before}{$perpage}";
		$messages  = wp_cache_get( $cache_key, 'bp_messages_threads' );

		if ( false === $messages || static::$noCache ) {
			// if current user isn't the recpient, then return empty array
			if ( ! static::is_thread_recipient( $thread_id ) ) {
				wp_cache_set( $cache_key, [], 'bp_messages_threads' );
				return [];
			}

			global $wpdb;
			$bp = buddypress();
			$last_deleted_id = static::$last_deleted_message ? static::$last_deleted_message->id : 0;
			$last_deleted_timestamp = static::$last_deleted_message? static::$last_deleted_message->date_sent : '0000-00-00 00:00:00';

			if ( ! $before ) {
				$before = bp_core_current_time();
				// $before = gmdate( 'Y-m-d H:i:s', ( time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS + 1 ) ) );
			}

			// Always sort by DESC by default.
			$messages = $wpdb->get_results( $sql =  $wpdb->prepare(
				"SELECT * FROM {$bp->messages->table_name_messages}
				WHERE thread_id = %d
				AND id > %d
				AND date_sent > %s
				AND date_sent <= %s
				ORDER BY date_sent DESC, id DESC
				LIMIT %d
			", $thread_id, $last_deleted_id, $last_deleted_timestamp, $before, $perpage ) );

			wp_cache_set( $cache_key, (array) $messages, 'bp_messages_threads' );
		}

		// Integer casting.
		foreach ( $messages as $key => $data ) {
			$messages[ $key ]->id        = (int) $messages[ $key ]->id;
			$messages[ $key ]->thread_id = (int) $messages[ $key ]->thread_id;
			$messages[ $key ]->sender_id = (int) $messages[ $key ]->sender_id;
		}

		return $messages;
	}