Add initial project files and configurations for Unity setup

Assets/Scripts/Core/Domain/GameSession.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using Core.Ports;
+
+namespace Core.Domain
+{
+    public class GameSession
+    {
+        private const string HighScoreKey = "HighScore";
+        
+        public int Score { get; private set; }
+        public int HighScore { get; private set; }
+        public bool IsGameOver { get; private set; }
+        
+        public event Action<int> OnScoreChanged;
+        public event Action<string> OnOrbSpawned;
+        public event Action OnOrbReset;
+        public event Action OnGameOver;
+
+        private readonly List<Tile> _tiles;
+        private readonly IPersistenceService _persistenceService;
+        private readonly Random _rng = new();
+        private int _playerFloorIndex = 0;
+
+        public GameSession(List<Tile> tiles, IPersistenceService persistenceService)
+        {
+            _tiles = tiles;
+            _persistenceService = persistenceService;
+            
+            Score = 0;
+            IsGameOver = false;
+            
+            HighScore = _persistenceService.Load(HighScoreKey, 0);
+        }
+
+        public void StartGame()
+        {
+            SpawnNextOrb();
+        }
+
+        public void OrbCollected()
+        {
+            if (IsGameOver) return;
+
+            Score += 10;
+            OnScoreChanged?.Invoke(Score);
+            SpawnNextOrb();
+        }
+
+        private void SpawnNextOrb()
+        { 
+            var validTiles = _tiles.FindAll(t => 
+                t.CurrentState == TileState.Stable && 
+                t.Floor == _playerFloorIndex
+            );
+            
+            if (validTiles.Count == 0)
+            {
+                validTiles = _tiles.FindAll(t => t.CurrentState == TileState.Stable);
+            }
+            
+            if (validTiles.Count == 0)
+            {
+                EndGame();
+                return;
+            }
+            
+            var pick = validTiles[_rng.Next(validTiles.Count)];
+            OnOrbSpawned?.Invoke(pick.Id);
+        }
+
+        public void EndGame()
+        {
+            if (IsGameOver) return;
+            
+            IsGameOver = true;
+            
+            if (Score > HighScore)
+            {
+                HighScore = Score;
+                _persistenceService.Save(HighScoreKey, HighScore);
+            }
+            
+            OnGameOver?.Invoke();
+        }
+
+        public void SetPlayerFloor(int floorIndex)
+        {
+            if (_playerFloorIndex == floorIndex) return;
+            
+            _playerFloorIndex = floorIndex;
+
+            if (IsGameOver) return;
+                
+            OnOrbReset?.Invoke();
+            SpawnNextOrb();
+        }
+    }
+}