Refactor stats

Zennysoft.Game.Ma/src/Components/HealthComponent.cs

@@ -0,0 +1,59 @@
+using Chickensoft.Collections;
+using Chickensoft.Serialization;
+using System;
+using Zennysoft.Ma.Adapter;
+
+namespace Zennysoft.Game.Ma;
+
+public class HealthComponent : IHealthComponent
+{
+  [Save("current_hp")]
+  public IAutoProp<int> CurrentHP => _currentHP;
+
+  [Save("maximum_hp")]
+  public IAutoProp<int> MaximumHP => _maximumHP;
+
+  private readonly AutoProp<int> _currentHP;
+
+  private readonly AutoProp<int> _maximumHP;
+
+  public event Action? HealthReachedZero;
+  public event Action? DamageTaken;
+
+  public bool AtFullHealth => CurrentHP.Value == MaximumHP.Value;
+
+  public HealthComponent(int initialHP)
+  {
+    _maximumHP = new AutoProp<int>(initialHP);
+    _currentHP = new AutoProp<int>(initialHP);
+  }
+
+  public void Heal(int healAmount)
+  {
+    var cappedAmount = Math.Min(healAmount + _currentHP.Value, _maximumHP.Value);
+    _currentHP.OnNext(cappedAmount);
+  }
+
+  public void Damage(int damageAmount)
+  {
+    var cappedAmount = Math.Max(_currentHP.Value - damageAmount, 0);
+    _currentHP.OnNext(cappedAmount);
+
+    if (cappedAmount == 0)
+      HealthReachedZero?.Invoke();
+    else
+      DamageTaken?.Invoke();
+  }
+
+  public void SetHealth(int health)
+  {
+    var cappedAmount = Math.Min(health, _maximumHP.Value);
+    _currentHP.OnNext(cappedAmount);
+  }
+
+  public void RaiseMaximumHP(int raiseAmount)
+  {
+    _maximumHP.OnNext(raiseAmount);
+    Heal(raiseAmount);
+  }
+}