Implements freeze, poisoned, badly poisoned

Plugins/PkmnLib.Plugin.Gen7/Scripts/Status/Poisoned.cs

@@ -3,5 +3,40 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Status;
 [Script(ScriptCategory.Status, "poisoned")]
 public class Poisoned : Script
 {
-    // TODO: Implement the Poisoned status effect.
+    private IPokemon? _pokemon;
+
+    /// <inheritdoc />
+    public override void OnAddedToParent(IScriptSource source)
+    {
+        if (source is not IPokemon pokemon)
+            throw new InvalidOperationException("Poisoned script can only be added to a Pokemon.");
+        _pokemon = pokemon;
+    }
+
+    public virtual float GetPoisonMultiplier() => 1f / 8f;
+
+    /// <inheritdoc />
+    public override void OnEndTurn(IBattle battle)
+    {
+        if (_pokemon == null)
+            return;
+        if (_pokemon.IsFainted)
+            return;
+
+        var damage = (uint)(_pokemon.MaxHealth * GetPoisonMultiplier());
+        if (damage == 0)
+            damage = 1;
+
+        var battleData = _pokemon.BattleData;
+        var eventBatchId = new EventBatchId();
+        battleData?.Battle.EventHook.Invoke(new DialogEvent("poisoned_damage", new Dictionary<string, object>
+        {
+            { "pokemon", _pokemon },
+            { "damage", damage },
+        })
+        {
+            BatchId = eventBatchId,
+        });
+        _pokemon.Damage(damage, DamageSource.Status, eventBatchId);
+    }
 }