working lasers

Assets/Station46/Modules/Laser/Scripts/LaserReceiver.cs

@@ -0,0 +1,70 @@
+using System;
+using UnityEngine;
+using Logger = EscapeRoomEngine.Engine.Runtime.Utilities.Logger;
+using LogType = EscapeRoomEngine.Engine.Runtime.Utilities.LogType;
+
+namespace Station46.Modules.Laser.Scripts
+{
+    public enum LaserEventType
+    {
+        Hit, Left
+    }
+
+    public static class LaserEventExtensions
+    {
+        public static string Description(this LaserEventType type, LaserReceiver receiver)
+        {
+            var action = type switch
+            {
+                LaserEventType.Hit => "hit",
+                LaserEventType.Left => "left",
+                _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
+            };
+
+            return $"{receiver} was {action}";
+        }
+    }
+
+    public delegate void LaserEventHandler(LaserReceiver source, LaserEventType e);
+    
+    public class LaserReceiver : MonoBehaviour
+    {
+        public event LaserEventHandler LaserEvent;
+        
+        private int _hitCount;
+
+        /// <summary>
+        /// Use this when a laser has just been pointed at this.
+        /// </summary>
+        public void Hit()
+        {
+            if (_hitCount == 0)
+            {
+                OnLaserEvent(LaserEventType.Hit);
+            }
+            _hitCount++;
+        }
+
+        /// <summary>
+        /// Use this when a laser is no longer pointing at this.
+        /// </summary>
+        public void Leave()
+        {
+            if (_hitCount > 0)
+            {
+                _hitCount--;
+            }
+            if (_hitCount == 0)
+            {
+                OnLaserEvent(LaserEventType.Left);
+            }
+        }
+
+        private void OnLaserEvent(LaserEventType type)
+        {
+            Logger.Log(type.Description(this), LogType.PuzzleDetail);
+            
+            LaserEvent?.Invoke(this, type);
+        }
+    }
+}