class TestScript : public WorldScript
{
public:
    TestScript(): WorldScript("TestScript")
    {
        events.ScheduleEvent(1, 30 * MINUTE * IN_MILLISECONDS);
    }

    void OnUpdate(uint32 diff) override
    {
        while (uint32 id = events.ExecuteEvent())
        {
            switch (id)
            {
            case 1:
                // spawn code here
                break;
            }
        }
    }

    EventMap events;
};