Implement move wish (#323)

* implement wish move

* Serene grace implementation idea

* only do the thingy if it actually gets effected.

* Revert "only do the thingy if it actually gets effected."

This reverts commit 4b084658d2.

* Revert "Serene grace implementation idea"

This reverts commit 4dd2504bc7.

* Fixes for Wish implementation

---------

Co-authored-by: Flashfyre <flashfireex@gmail.com>

src/data/arena-tag.ts

@@ -1,10 +1,10 @@
 import { Arena } from "../field/arena";
 import { Type } from "./type";
 import * as Utils from "../utils";
-import { MoveCategory, StatChangeAttr, allMoves } from "./move";
+import { MoveCategory, allMoves } from "./move";
 import { getPokemonMessage } from "../messages";
 import Pokemon, { HitResult, PokemonMove } from "../field/pokemon";
-import { MoveEffectPhase, StatChangePhase } from "../phases";
+import { MoveEffectPhase, PokemonHealPhase, StatChangePhase} from "../phases";
 import { StatusEffect } from "./status-effect";
 import { BattlerIndex } from "../battle";
 import { Moves } from "./enums/moves";
@@ -146,6 +146,31 @@ class AuroraVeilTag extends WeakenMoveScreenTag {
   }
 }
 
+class WishTag extends ArenaTag {
+  private battlerIndex: BattlerIndex;
+  private triggerMessage: string;
+  private healHp: number;
+
+  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+    super(ArenaTagType.WISH, turnCount, Moves.WISH, sourceId, side);
+  }
+
+  onAdd(arena: Arena): void {
+    const user = arena.scene.getPokemonById(this.sourceId);
+    this.battlerIndex = user.getBattlerIndex();
+    this.triggerMessage = getPokemonMessage(user, '\'s wish\ncame true!');
+    this.healHp = Math.max(Math.floor(user.getMaxHp() / 2), 1);
+  }
+  
+  onRemove(arena: Arena): void {
+    const target = arena.scene.getField()[this.battlerIndex];
+    if (target?.isActive(true)) {
+      arena.scene.queueMessage(this.triggerMessage);
+      arena.scene.unshiftPhase(new PokemonHealPhase(target.scene, target.getBattlerIndex(), this.healHp, null, true, false));
+    }
+  }
+}
+
 export class WeakenMoveTypeTag extends ArenaTag {
   private weakenedType: Type;
 
@@ -472,6 +497,8 @@ export function getArenaTag(tagType: ArenaTagType, turnCount: integer, sourceMov
     case ArenaTagType.FUTURE_SIGHT:
     case ArenaTagType.DOOM_DESIRE:
       return new DelayedAttackTag(tagType, sourceMove, sourceId, targetIndex);
+    case ArenaTagType.WISH:
+      return new WishTag(turnCount, sourceId, side);
     case ArenaTagType.STEALTH_ROCK:
       return new StealthRockTag(sourceId, side);
     case ArenaTagType.STICKY_WEB:

src/data/enums/arena-tag-type.ts

@@ -8,6 +8,7 @@ export enum ArenaTagType {
   MIST = "MIST",
   FUTURE_SIGHT = "FUTURE_SIGHT",
   DOOM_DESIRE = "DOOM_DESIRE",
+  WISH = "WISH",
   STEALTH_ROCK = "STEALTH_ROCK",
   STICKY_WEB = "STICKY_WEB",
   TRICK_ROOM = "TRICK_ROOM",

src/data/move.ts

@@ -4493,8 +4493,8 @@ export function initMoves() {
       .attr(AbilityCopyAttr),
     new SelfStatusMove(Moves.WISH, Type.NORMAL, -1, 10, -1, 0, 3)
       .triageMove()
-      .unimplemented(),
-    new SelfStatusMove(Moves.ASSIST, Type.NORMAL, -1, 20, -1, 0, 3)
+      .attr(AddArenaTagAttr, ArenaTagType.WISH, 2, true),
+  new SelfStatusMove(Moves.ASSIST, Type.NORMAL, -1, 20, -1, 0, 3)
       .attr(RandomMovesetMoveAttr, true)
       .ignoresVirtual(),
     new SelfStatusMove(Moves.INGRAIN, Type.GRASS, -1, 20, -1, 0, 3)