Initial commit

Awperative/Kernel/Entities/Scenes/Behaviors.cs

@@ -0,0 +1,134 @@
+using System;
+using System.Collections.Generic;
+
+
+namespace Gravity.Kernel;
+
+
+public sealed partial class Scene
+{
+    
+    public List<Behavior> behaviors { get; private set; } = [];
+
+    //todo: use extern keyword to make transform ambiguous to support potential 3D games
+
+    
+    public Generic AddBehavior<Generic>(object[] args) where Generic : Behavior {
+
+        if (SingletonExists<Generic>())
+            throw new Exception("Cannot add behavior when singleton exists!");
+        
+        Generic behavior = (Generic) Activator.CreateInstance(typeof(Generic), args);
+        
+        if(behavior == null)
+            throw new Exception("Failed to create behavior!");
+        
+        behaviors.Add(behavior);
+        behavior.Initiate(this);
+        
+        BehaviorCreatedEvent?.Invoke(this, new BehaviorCreateEvent(behavior, this));
+        
+        return behavior;
+    }
+    
+    public Generic AddBehavior<Generic>() where Generic : Behavior {
+        
+        if (SingletonExists<Generic>())
+            throw new Exception("Cannot add behavior when singleton exists!");
+        
+        Generic behavior = (Generic) Activator.CreateInstance(typeof(Generic));
+        
+        if(behavior == null)
+            throw new Exception("Failed to create behavior!");
+        
+        behaviors.Add(behavior);
+        behavior.Initiate(this);
+        
+        BehaviorCreatedEvent?.Invoke(this, new BehaviorCreateEvent(behavior, this));
+        
+        return behavior;
+    }
+    
+    public Generic[] GetBehaviors<Generic>() where Generic : Behavior {
+        
+        List<Behavior> foundBehaviors = behaviors.FindAll(x => x.GetType() == typeof(Generic));
+        
+        if(foundBehaviors.Count == 0)
+            throw new Exception("Scene has no behaviors of that type!");
+        
+        return foundBehaviors.ToArray() as Generic[];
+    }
+    
+    public Generic GetBehavior<Generic>() where Generic : Behavior {
+        
+        Behavior foundBehavior = behaviors.Find(x => x.GetType() == typeof(Generic));
+        
+        if(foundBehavior == null)
+            throw new Exception("Scene has no behaviors of that type!");
+        
+        return foundBehavior as Generic;
+    }
+
+    public void RemoveBehaviors<Generic>() where Generic : Behavior {
+        
+        Behavior[] foundBehaviors = GetBehaviors<Generic>();
+        
+        if(foundBehaviors.Length == 0)
+            throw new Exception("Scene has no behaviors of that type!");
+
+        foreach (Behavior behavior in foundBehaviors) {
+            behavior.End();
+            behaviors.Remove(behavior);
+            BehaviorDestroyedEvent?.Invoke(this, new BehaviorDestroyEvent(behavior, this));
+        }
+    }
+    
+    public void RemoveBehavior<Generic>() where Generic : Behavior {
+        
+        Behavior foundBehavior = GetBehavior<Generic>();
+        
+        if(foundBehavior == null)
+            throw new Exception("Scene has no behaviors of that type!");
+        
+        foundBehavior.End();
+        behaviors.Remove(foundBehavior);
+        BehaviorDestroyedEvent?.Invoke(this ,new BehaviorDestroyEvent(foundBehavior, this));
+    }
+
+    public void RemoveBehavior(Behavior __behavior) {
+        __behavior.End();
+        behaviors.Remove(__behavior);
+        BehaviorDestroyedEvent?.Invoke(this, new BehaviorDestroyEvent(__behavior, this));
+    }
+
+    public Generic FindSingleton<Generic>() where Generic : Behavior
+    {
+        foreach (Behavior __behavior in behaviors)
+            if (__behavior.GetType() == typeof(Generic))
+                if(__behavior.EnforceSingleton)
+                    return (Generic) __behavior;
+                else
+                    throw new Exception("Behavior is not a singleton");
+        
+        throw new Exception("Behavior not found");
+        return null;
+    }
+
+    public bool SingletonExists<Generic>() where Generic : Behavior
+    {
+        
+        foreach (Behavior __behavior in behaviors)
+            if (__behavior.GetType() == typeof(Generic))
+                if (__behavior.EnforceSingleton)
+                    return true;
+                else
+                    return false;
+        
+        return false;
+    }
+    
+    public void RecompileBehaviorOrder() {
+        behaviors.Sort((a, b) => a.Priority.CompareTo(b.Priority));
+        behaviors.Reverse();
+    }
+}