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ONDServer/Enemies/MovementOpportunity.cs

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+using System.Diagnostics;
+
+namespace ONDServer.Enemies;
+
+public class MovementOpportunity {
+    public int Interval{ get; set; }
+    // public double ChanceDenominator;
+    public double MovementChance{
+        get;
+        set{
+            field = value;
+            GuaranteeSuccess(value >= 1);
+        }
+    }
+
+    public bool Running => stopwatch.IsRunning;
+    
+    private Stopwatch stopwatch = new();
+    private long stopwatchOffset = 0;
+    
+    private Random random = new();
+
+    public MovementOpportunity(int intervalMs, double movementChance) {
+        Interval = intervalMs;
+        MovementChance = movementChance;
+    }
+
+    public MovementOpportunity(int intervalMs) {
+        Interval = intervalMs;
+        MovementChance = 1;
+    }
+
+    public void Start() {
+        stopwatch.Start();
+    }
+    public void Stop() {
+        stopwatch.Stop();
+    }
+
+    public bool Check() {
+        if (stopwatch.ElapsedMilliseconds - stopwatchOffset >= Interval){
+            int overshoot = (int)(stopwatch.ElapsedMilliseconds - stopwatchOffset - Interval);
+            stopwatchOffset = stopwatch.ElapsedMilliseconds - overshoot;
+            // stopwatch.Restart();
+            return true;
+        }
+        return false;
+    }
+
+    public bool Roll() => roll();
+    private Func<bool> roll = () => true;
+    
+    public bool CheckAndRoll() {
+        if (Check()) return Roll();
+        return false;
+    }
+
+    public void GuaranteeSuccess(bool value) {
+        roll = value ? () => true : () => random.NextDouble() <= MovementChance;
+    }
+
+}