refactor (#6)

Reviewed-on: #6

scripts/State/SessionState.cs

@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.State;
+
+/// <summary>
+/// Data for the current gameplay session.
+/// Reset when player dies or completes a level.
+/// </summary>
+public class SessionState
+{
+    /// <summary>
+    /// Current level index being played.
+    /// </summary>
+    public int CurrentLevel { get; set; }
+
+    /// <summary>
+    /// Coins collected during this session (not yet saved).
+    /// </summary>
+    public int CoinsCollected { get; set; }
+
+    /// <summary>
+    /// Skills unlocked during this session (not yet saved).
+    /// </summary>
+    public List<SkillData> SkillsUnlocked { get; set; } = new();
+
+    /// <summary>
+    /// Creates a fresh session state.
+    /// </summary>
+    public static SessionState CreateDefault() => new()
+    {
+        CurrentLevel = 0,
+        CoinsCollected = 0,
+        SkillsUnlocked = new List<SkillData>()
+    };
+
+    /// <summary>
+    /// Resets session state to defaults.
+    /// </summary>
+    public void Reset()
+    {
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+
+    /// <summary>
+    /// Resets completely including level.
+    /// </summary>
+    public void ResetAll()
+    {
+        CurrentLevel = 0;
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+}