Basic event scheduler (#83)

Projects/Scripts/Engines/Events/BroadcastEvent.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Server.Engines.Events
+{
+  public class BroadcastEvent : IEvent
+  {
+    private int _hue = 0;
+    private string _text = "";
+    public static void Initialize()
+    {
+      /*
+      EventScheduler.Instance.ScheduleEvent(new BroadcastEvent(22, "Test Message Please Ignore 2min"), 0, 0, TimeSpan.FromMinutes(2.0));
+      EventScheduler.Instance.ScheduleEvent(new BroadcastEvent(33, "Test Message Please Ignore 3min"), 0, 0, TimeSpan.FromMinutes(3.0));
+      EventScheduler.Instance.ScheduleEvent(new BroadcastEvent(44, "Test Message Please Ignore 4min"), 0, 0, TimeSpan.FromMinutes(4.0));
+      */
+    }
+
+    public BroadcastEvent(int hue, string text)
+    {
+      _hue = hue;
+      _text = text;
+    }
+
+    public override string ToString()
+    {
+      return $"Broadcast: {_text}";
+    }
+
+    public void OnEventScheduled()
+    {
+      World.Broadcast(_hue, true, _text);
+    }
+  }
+}

Projects/Scripts/Engines/Events/EventScheduler.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Server.Engines.Events
+{
+  public interface IEvent
+  {
+    void OnEventScheduled();
+  }
+
+  public class EventScheduleEntry
+  {
+    public DateTime NextOccurrence { get; private set; }
+    public TimeSpan Interval { get; private set; }
+    private TimeSpan _offset;
+    private IEvent _event;
+
+    public EventScheduleEntry(IEvent e, DateTime firstSpawn, TimeSpan interval, TimeSpan offset)
+    {
+      _offset = offset;
+      _event = e;
+      Interval = interval;
+      NextOccurrence = firstSpawn;
+    }
+
+    public void Occur()
+    {
+      NextOccurrence += Interval;
+
+      _event?.OnEventScheduled();
+    }
+
+    public override string ToString()
+    {
+      return _event?.ToString();
+    }
+  }
+  public class EventScheduler : Timer
+  {
+    private static EventScheduler _instance;
+    private List<EventScheduleEntry> _schedule = new List<EventScheduleEntry>();
+
+    public static EventScheduler Instance => _instance ??= new EventScheduler();
+    public static List<IEvent> AvailableEvents { get; } = new List<IEvent>();
+
+    private EventScheduler() : base(TimeSpan.Zero, TimeSpan.FromSeconds(1.0))
+    {
+    }
+
+    public static void Initialize()
+    {
+      Instance.Start();
+    }
+
+    public void ScheduleEvent(IEvent e, int hour, int min)
+    {
+      ScheduleEvent(e, hour, min, TimeSpan.FromDays(1.0));
+    }
+
+    public void ScheduleEvent(IEvent e, int hour, int min, TimeSpan interval)
+    {
+      DateTime now = DateTime.UtcNow;
+      DateTime firstRun = new DateTime(now.Year, now.Month, now.Day, hour, min, 0);
+
+      while (now > firstRun)
+        firstRun += interval;
+
+      ScheduleEvent(new EventScheduleEntry(e, firstRun, interval, TimeSpan.FromHours(hour) + TimeSpan.FromMinutes(min)));
+    }
+
+    public void ScheduleEvent(EventScheduleEntry e)
+    {
+      _schedule.Add(e);
+    }
+
+    public void RemoveEvent(EventScheduleEntry entry)
+    {
+      _schedule.Remove(entry);
+    }
+
+    protected override void OnTick()
+    {
+      foreach (EventScheduleEntry entry in _schedule)
+        if (entry.NextOccurrence <= DateTime.UtcNow)
+          entry.Occur();
+    }
+  }
+}