generate simple room

Assets/Escape Room Engine/Engine/Scripts/Engine.cs

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+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace Escape_Room_Engine.Engine.Scripts
+{
+    public class Engine : MonoBehaviour
+    {
+        public static Engine DefaultEngine => FindObjectOfType<Engine>();
+
+        public Material roomMaterial;
+
+        public int NumberOfRooms => _rooms.Count;
+
+        private List<Room> _rooms = new(1);
+
+        public void GenerateRoom()
+        {
+            // get the last entrance from the newest room or create a spawn passage with no entrance door for where the player will start
+            var entrance = NumberOfRooms > 0 ? _rooms[0].exit : new Passage();
+            
+            var room = new Room(entrance);
+            _rooms.Add(room);
+            
+            GenerateSpace(room, entrance); // TODO: rooms with more than one space
+            room.InstantiateRoom(transform, (_rooms.Count - 1).ToString());
+        }
+
+        void GenerateSpace(Room room, Passage from)
+        {
+            var exit = new Passage();
+            var size = new SpaceSize(Random.Range(2, 6), Random.Range(2, 6)); // TODO: no hardcoded space size
+            var space = new Space(size, from, exit);
+            room.AddSpace(space, exit);
+        }
+
+        /// <summary>
+        /// Dispose of the oldest room to save resources.
+        /// </summary>
+        public void DisposeOldestRoom()
+        {
+            if (NumberOfRooms > 0)
+            {
+                _rooms[NumberOfRooms - 1].Destroy();
+                _rooms.RemoveAt(NumberOfRooms - 1);
+            }
+        }
+    }
+}