Fixes and reworking of item use

PkmnLib.Dynamic/ScriptHandling/ItemScript.cs

@@ -36,7 +36,7 @@ public abstract class ItemScript : IDeepCloneable
     /// <summary>
     /// Returns whether the item requires a target to be used.
     /// </summary>
-    public virtual bool RequiresTarget => false;
+    public virtual ItemTargetType TargetType => ItemTargetType.None;
 
     /// <summary>
     /// Returns whether the item is usable on the given target.

PkmnLib.Dynamic/ScriptHandling/PokeballScript.cs

@@ -29,7 +29,7 @@ public abstract class PokeballScript : ItemScript
     public override bool IsItemUsable => true;
 
     /// <inheritdoc />
-    public override bool RequiresTarget => true;
+    public override ItemTargetType TargetType => ItemTargetType.FoePokemon;
 
     /// <inheritdoc />
     public override bool IsTargetValid(IPokemon target) =>

PkmnLib.Dynamic/ScriptHandling/ScriptExecution.cs

@@ -100,8 +100,8 @@ public static class ScriptExecution
     /// <summary>
     /// Executes a script on an item.
     /// </summary>
-    public static void RunItemScript(this IItem item, ScriptResolver scriptResolver, IPokemon? target,
-        EventHook eventHook)
+    public static void RunItemScript(this IItem item, ScriptResolver scriptResolver, IPokemon? target, IPokemon user,
+        IBattle battle, EventHook eventHook)
     {
         if (!scriptResolver.TryResolveBattleItemScript(item, out var itemScript))
         {
@@ -111,16 +111,20 @@ public static class ScriptExecution
             return;
 
         itemScript.OnInitialize(item.BattleEffect!.Parameters);
-        var requiresTarget = itemScript.RequiresTarget;
-        if (requiresTarget)
-        {
-            if (target == null)
-                throw new ArgumentNullException(nameof(target), "Item script requires a target.");
-            itemScript.OnUseWithTarget(target, eventHook);
-        }
-        else
+        var targetType = itemScript.TargetType;
+        if (targetType == ItemTargetType.None)
         {
             itemScript.OnUse(eventHook);
         }
+        else
+        {
+            if (target == null)
+                throw new ArgumentNullException(nameof(target), "Item script requires a target.");
+            if (!targetType.IsValidTarget(battle, user, target))
+                throw new InvalidOperationException("Item script target is not valid for the required target type.");
+            if (!itemScript.IsTargetValid(target))
+                throw new InvalidOperationException("Item script target is not valid.");
+            itemScript.OnUseWithTarget(target, eventHook);
+        }
     }
 }