Implements terrain

Plugins/PkmnLib.Plugin.Gen7/Scripts/Terrain/ElectricTerrain.cs

@@ -3,5 +3,36 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Terrain;
 [Script(ScriptCategory.Terrain, "electric_terrain")]
 public class ElectricTerrain : Script
 {
-    // TODO: Implement Terrain
+    private static bool IsAffectedByTerrain(IPokemon pokemon) =>
+        !pokemon.IsFloating;
+
+    /// <inheritdoc />
+    public override void ChangeBasePower(IExecutingMove move, IPokemon target, byte hit, ref ushort basePower)
+    {
+        if (!IsAffectedByTerrain(move.User))
+            return;
+        var type = move.GetHitData(target, hit).Type;
+        if (type?.Name == "electric")
+            basePower = basePower.MultiplyOrMax(1.5f);
+    }
+
+    /// <inheritdoc />
+    public override void PreventStatusChange(IPokemon pokemon, StringKey status, bool selfInflicted,
+        ref bool preventStatus)
+    {
+        if (!IsAffectedByTerrain(pokemon))
+            return;
+        if (status == ScriptUtils.ResolveName<Status.Sleep>())
+            preventStatus = true;
+    }
+
+    /// <inheritdoc />
+    public override void PreventVolatileAdd(IScriptSource parent, Script script, ref bool preventVolatileAdd)
+    {
+        if (parent is IPokemon pokemon && !IsAffectedByTerrain(pokemon))
+            return;
+
+        if (script is Pokemon.YawnEffect)
+            preventVolatileAdd = true;
+    }
 }