Refactored/recreated server system. Seperated into sub systems. Still wip

MoonlightServers.Daemon/ServerSystem/SubSystems/OnlineDetectionService.cs

@@ -0,0 +1,45 @@
+using System.Text.RegularExpressions;
+
+namespace MoonlightServers.Daemon.ServerSystem.SubSystems;
+
+public class OnlineDetectionService : ServerSubSystem
+{
+    // We are compiling the regex when the first output has been received
+    // and resetting it after the server has stopped to maximize the performance
+    // but allowing the startup detection string to change :>
+    
+    private Regex? CompiledRegex = null;
+    
+    public OnlineDetectionService(Server server, ILogger logger) : base(server, logger)
+    {
+        
+    }
+
+    public override Task Initialize()
+    {
+        var consoleSubSystem = Server.GetRequiredSubSystem<ConsoleSubSystem>();
+
+        consoleSubSystem.OnOutput += async line =>
+        {
+            if(StateMachine.State != ServerState.Starting)
+                return;
+
+            if (CompiledRegex == null)
+                CompiledRegex = new Regex(Configuration.OnlineDetection, RegexOptions.Compiled);
+            
+            if (Regex.Matches(line, Configuration.OnlineDetection).Count == 0)
+                return;
+            
+            await StateMachine.FireAsync(ServerTrigger.OnlineDetected);
+        };
+
+        StateMachine.Configure(ServerState.Offline)
+            .OnEntryAsync(_ =>
+            {
+                CompiledRegex = null;
+                return Task.CompletedTask;
+            });
+        
+        return Task.CompletedTask;
+    }
+}