have arena tags check their sides. (#447)

* have arena traps check their sides.

* make sure we check the right tags layers

src/data/move.ts

@@ -2876,7 +2876,7 @@ export class AddArenaTagAttr extends MoveEffectAttr {
   public tagType: ArenaTagType;
   public turnCount: integer;
   private failOnOverlap: boolean;
-  private selfSideTarget: boolean;
+  public selfSideTarget: boolean;
 
   constructor(tagType: ArenaTagType, turnCount?: integer, failOnOverlap: boolean = false, selfSideTarget: boolean = false) {
     super(true, MoveEffectTrigger.POST_APPLY, true);
@@ -2909,9 +2909,10 @@ export class AddArenaTagAttr extends MoveEffectAttr {
 export class AddArenaTrapTagAttr extends AddArenaTagAttr {
   getCondition(): MoveConditionFunc {
     return (user, target, move) => {
-      if (move.category !== MoveCategory.STATUS || !user.scene.arena.getTag(this.tagType))
+      const side = (this.selfSideTarget ? user : target).isPlayer() ? ArenaTagSide.PLAYER : ArenaTagSide.ENEMY;
+      if (move.category !== MoveCategory.STATUS || !user.scene.arena.getTagOnSide(this.tagType, side))
         return true;
-      const tag = user.scene.arena.getTag(this.tagType) as ArenaTrapTag;
+      const tag = user.scene.arena.getTagOnSide(this.tagType, side) as ArenaTrapTag;
       return tag.layers < tag.maxLayers;
     };
   }

src/field/arena.ts

@@ -492,7 +492,7 @@ export class Arena {
 	}
 
   addTag(tagType: ArenaTagType, turnCount: integer, sourceMove: Moves, sourceId: integer, side: ArenaTagSide = ArenaTagSide.BOTH, targetIndex?: BattlerIndex): boolean {
-    const existingTag = this.getTag(tagType);
+    const existingTag = this.getTagOnSide(tagType, side);
     if (existingTag) {
       existingTag.onOverlap(this);
       return false;