More abilities

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/PreventStatLowering.cs

@@ -5,26 +5,37 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
 [Script(ScriptCategory.Ability, "prevent_stat_lowering")]
 public class PreventStatLowering : Script
 {
-    private Statistic _statistic;
+    /// <summary>
+    /// The statistic that this ability prevents from being lowered.
+    /// Null means it prevents all stat lowering.
+    /// </summary>
+    private Statistic? _statistic;
 
     /// <inheritdoc />
     public override void OnInitialize(IReadOnlyDictionary<StringKey, object?>? parameters)
     {
         if (parameters is null)
             throw new ArgumentNullException(nameof(parameters), "Parameters cannot be null.");
-        if (!parameters.TryGetValue("stat", out var statObj) || statObj is not string statStr)
-            throw new ArgumentException("Parameter 'stat' is required and must be a string.", nameof(parameters));
-        if (!Enum.TryParse(statStr, true, out Statistic stat))
-            throw new ArgumentException($"Invalid statistic '{statStr}' provided.", nameof(statStr));
-
-        _statistic = stat;
+        if (parameters.TryGetValue("stat", out var statObj) && statObj is string statStr)
+        {
+            if (!Enum.TryParse(statStr, true, out Statistic stat))
+                throw new ArgumentException($"Invalid statistic '{statStr}' provided.", nameof(statStr));
+            _statistic = stat;
+        }
     }
 
     /// <inheritdoc />
     public override void PreventStatBoostChange(IPokemon target, Statistic stat, sbyte amount, bool selfInflicted,
         ref bool prevent)
     {
+        if (_statistic is not null && _statistic != stat)
+            return;
+        if (amount >= 0)
+            return;
         if (!selfInflicted)
-            prevent = false;
+        {
+            target.BattleData?.Battle.EventHook.Invoke(new AbilityTriggerEvent(target));
+            prevent = true;
+        }
     }
 }