Change affinity

src/items/throwable/ThrowableItem.cs

@@ -3,16 +3,17 @@ using Chickensoft.Introspection;
 using GameJamDungeon;
 using Godot;
 using System;
+using System.ComponentModel;
 
 [Meta(typeof(IAutoNode))]
 public partial class ThrowableItem : Node3D, IUsableItem
 {
   public override void _Notification(int what) => this.Notify(what);
 
-  [Dependency] public IGameRepo GameRepo => this.DependOn<IGameRepo>();
-
   [Dependency] public IGame Game => this.DependOn<IGame>();
 
+  [Dependency] public IGameRepo GameRepo => this.DependOn<IGameRepo>();
+
   public InventoryItemStats Info => ThrowableItemInfo;
 
   public int Count { get; }
@@ -26,10 +27,23 @@ public partial class ThrowableItem : Node3D, IUsableItem
 
   [Node] public Area3D Pickup { get; set; } = default!;
 
+  private ThrowableItemTag[] _affinityTypes;
+
+  private int _affinityIndex = 0;
+
   public void OnResolved()
   {
     Sprite.Texture = ThrowableItemInfo.Texture;
     Pickup.BodyEntered += OnEntered;
+    _affinityTypes =
+      [
+        ThrowableItemTag.InflictBaseDamage,
+        ThrowableItemTag.InflictHydricDamage,
+        ThrowableItemTag.InflictIgneousDamage,
+        ThrowableItemTag.InflictTelluricDamage,
+        ThrowableItemTag.InflictAeolicDamage,
+        ThrowableItemTag.InflictFerrumDamage
+      ];
   }
 
   public void Use()
@@ -38,6 +52,24 @@ public partial class ThrowableItem : Node3D, IUsableItem
       Game.HealHP(ThrowableItemInfo.HealHPAmount);
     if (ThrowableItemInfo.HealVTAmount > 0)
       Game.HealVT(ThrowableItemInfo.HealVTAmount);
+
+    if (ThrowableItemInfo.UsableItemTags.Contains(UsableItemTag.DoubleEXP))
+      Game.DoubleEXP(TimeSpan.FromSeconds(30));
+
+    if (ThrowableItemInfo.ThrowableItemTags.Contains(ThrowableItemTag.CanChangeAffinity))
+      ChangeAffinity();
+  }
+
+  private void ChangeAffinity()
+  {
+    ThrowableItemInfo.ThrowableItemTags.Remove(_affinityTypes[_affinityIndex]);
+    _affinityIndex = (_affinityIndex + 1) % (_affinityTypes.Length);
+    ThrowableItemInfo.ThrowableItemTags.Add(_affinityTypes[_affinityIndex]);
+
+    // TODO: Make this an inventory animation to cycle through elements.
+    ThrowableItemInfo.Description =
+      $"{GetDescription(_affinityTypes[_affinityIndex])} when thrown." +
+      $"{System.Environment.NewLine}Use item to change Affinity.";
   }
 
   public void OnEntered(Node3D body)
@@ -46,4 +78,19 @@ public partial class ThrowableItem : Node3D, IUsableItem
     if (isAdded)
       QueueFree();
   }
+
+  private static string GetDescription(ThrowableItemTag enumValue)
+  {
+    var field = enumValue.GetType().GetField(enumValue.ToString());
+    if (field == null)
+      return enumValue.ToString();
+
+    var attributes = field.GetCustomAttributes(typeof(DescriptionAttribute), false);
+    if (Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) is DescriptionAttribute attribute)
+    {
+      return attribute.Description;
+    }
+
+    return enumValue.ToString();
+  }
 }