Added tests for Last Resort regarding moveHistory

src/data/moves/move.ts

@@ -7781,17 +7781,27 @@ export class StatusIfBoostedAttr extends MoveEffectAttr {
   }
 }
 
+/**
+ * Attribute to fail move usage unless all of the user's other moves have been used at least once.
+ * Used by {@linkcode Moves.LAST_RESORT}.
+ */
 export class LastResortAttr extends MoveAttr {
+  // TODO: Verify behavior as Bulbapedia page is _extremely_ poorly documented
   getCondition(): MoveConditionFunc {
-    return (user: Pokemon, target: Pokemon, move: Move) => {
-      const uniqueUsedMoveIds = new Set<Moves>();
-      const movesetMoveIds = user.getMoveset().map(m => m.moveId);
-      user.getMoveHistory().map(m => {
-        if (m.move !== move.id && movesetMoveIds.find(mm => mm === m.move)) {
-          uniqueUsedMoveIds.add(m.move);
+    return (user: Pokemon, _target: Pokemon, move: Move) => {
+      const movesInMoveset = new Set<Moves>(user.getMoveset().map(m => m.moveId));
+      if (!movesInMoveset.delete(move.id) || !movesInMoveset.size) {
+        return false; // Last resort fails if used when not in user's moveset or no other moves exist
       }
-      });
-      return uniqueUsedMoveIds.size >= movesetMoveIds.length - 1;
+
+      const movesInHistory = new Set(
+        user.getMoveHistory()
+        .filter(m => !m.virtual) // TODO: Change to (m) => m < MoveUseType.INDIRECT after Dancer PR refactors virtual into enum
+        .map(m => m.move)
+      );
+
+      // Since `Set.intersection()` is only present in ESNext, we have to coerce it to an array to check inclusion
+      return [...movesInMoveset].every(m => movesInHistory.has(m))
     };
   }
 }
@@ -9009,6 +9019,7 @@ export function initMoves() {
       .soundBased()
       .target(MoveTarget.RANDOM_NEAR_ENEMY)
       .partial(), // Does not lock the user, does not stop Pokemon from sleeping
+      // Likely can make use of FrenzyAttr and an ArenaTag (just without the FrenzyMissFunc)
     new SelfStatusMove(Moves.STOCKPILE, PokemonType.NORMAL, -1, 20, -1, 0, 3)
       .condition(user => (user.getTag(StockpilingTag)?.stockpiledCount ?? 0) < 3)
       .attr(AddBattlerTagAttr, BattlerTagType.STOCKPILING, true),
@@ -9444,7 +9455,8 @@ export function initMoves() {
       .makesContact(true)
       .attr(PunishmentPowerAttr),
     new AttackMove(Moves.LAST_RESORT, PokemonType.NORMAL, MoveCategory.PHYSICAL, 140, 100, 5, -1, 0, 4)
-      .attr(LastResortAttr),
+      .attr(LastResortAttr)
+      .edgeCase(), // May or may not need to ignore remotely called moves depending on how it works
     new StatusMove(Moves.WORRY_SEED, PokemonType.GRASS, 100, 10, -1, 0, 4)
       .attr(AbilityChangeAttr, Abilities.INSOMNIA)
       .reflectable(),

src/field/pokemon.ts

@@ -7768,16 +7768,26 @@ export class PokemonSummonData {
   /** Array containing all berries eaten in the last turn; used by {@linkcode Abilities.CUD_CHEW} */
   public berriesEatenLast: BerryType[] = [];
 
-  /** The number of turns the pokemon has passed since entering the battle */
+  /**
+   * The number of turns this pokemon has spent in the active position since entering the battle.
+   * Currently exclusively used for positioning the battle cursor.
+   */
   public turnCount = 1;
-  /** The number of turns the pokemon has passed since the start of the wave */
+  /**
+   * The number of turns this pokemon has spent in the active position since starting a new wave.
+   * Used for most "first turn only" conditions ({@linkcode Moves.FAKE_OUT | Fake Out}, {@linkcode Moves.FIRST_IMPRESSION | First Impression}, etc.)
+   */
   public waveTurnCount = 1;
-  /** The list of moves the pokemon has used since entering the battle */
+  /**
+   * An array of all moves this pokemon has used since entering the battle.
+   * Used for most moves and abilities that check prior move usage or copy already-used moves.
+   */
   public moveHistory: TurnMove[] = [];
 
   constructor(source?: PokemonSummonData | Partial<PokemonSummonData>) {
     if (!isNullOrUndefined(source)) {
       Object.assign(this, source)
+      // TODO: Do we need these mapping statements?
       this.moveset &&= this.moveset.map(m => PokemonMove.loadMove(m))
       this.tags &&= this.tags.map(t => loadBattlerTag(t))
     }

src/phases/switch-summon-phase.ts

@@ -67,7 +67,8 @@ export class SwitchSummonPhase extends SummonPhase {
         !(this.player ? globalScene.getPlayerParty() : globalScene.getEnemyParty())[this.slotIndex])
     ) {
       if (this.player) {
-        return this.switchAndSummon();
+        this.switchAndSummon();
+        return;
       }
       globalScene.time.delayedCall(750, () => this.switchAndSummon());
       return;

test/moves/fake_out.test.ts

@@ -26,64 +26,71 @@ describe("Moves - Fake Out", () => {
       .moveset([Moves.FAKE_OUT, Moves.SPLASH])
       .enemyMoveset(Moves.SPLASH)
       .enemyLevel(10)
-      .startingLevel(10) // prevent LevelUpPhase from happening
+      .startingLevel(1) // prevent LevelUpPhase from happening
       .disableCrits();
   });
 
-  it("can only be used on the first turn a pokemon is sent out in a battle", async () => {
+  it("should only work the first turn a pokemon is sent out in a battle", async () => {
     await game.classicMode.startBattle([Species.FEEBAS]);
 
-    const enemy = game.scene.getEnemyPokemon()!;
+    const corv = game.scene.getEnemyPokemon()!;
 
     game.move.select(Moves.FAKE_OUT);
     await game.toNextTurn();
 
-    expect(enemy.hp).toBeLessThan(enemy.getMaxHp());
-    const postTurnOneHp = enemy.hp;
+    expect(corv.hp).toBeLessThan(corv.getMaxHp());
+    const postTurnOneHp = corv.hp;
 
     game.move.select(Moves.FAKE_OUT);
     await game.toNextTurn();
 
-    expect(enemy.hp).toBe(postTurnOneHp);
-  }, 20000);
+    expect(corv.hp).toBe(postTurnOneHp);
+  });
 
   // This is a PokeRogue buff to Fake Out
-  it("can be used at the start of every wave even if the pokemon wasn't recalled", async () => {
+  it("should succeed at the start of each new wave, even if user wasn't recalled", async () => {
     await game.classicMode.startBattle([Species.FEEBAS]);
 
-    const enemy = game.scene.getEnemyPokemon()!;
-    enemy.damageAndUpdate(enemy.getMaxHp() - 1);
-
+    // set hp to 1 for easy knockout
+    game.scene.getEnemyPokemon()!.hp = 1;
     game.move.select(Moves.FAKE_OUT);
     await game.toNextWave();
 
     game.move.select(Moves.FAKE_OUT);
     await game.toNextTurn();
 
-    expect(game.scene.getEnemyPokemon()!.isFullHp()).toBe(false);
-  }, 20000);
+    const corv = game.scene.getEnemyPokemon()!;
+    expect(corv).toBeDefined();
+    expect(corv?.hp).toBeLessThan(corv?.getMaxHp());
+  });
 
-  it("can be used again if recalled and sent back out", async () => {
-    game.override.startingWave(4);
+  // This is a PokeRogue buff to Fake Out
+  it("should succeed at the start of each new wave, even if user wasn't recalled", async () => {
+    await game.classicMode.startBattle([Species.FEEBAS]);
+
+    // set hp to 1 for easy knockout
+    game.scene.getEnemyPokemon()!.hp = 1;
+    game.move.select(Moves.FAKE_OUT);
+    await game.toNextWave();
+
+    game.move.select(Moves.FAKE_OUT);
+    await game.toNextTurn();
+
+    const corv = game.scene.getEnemyPokemon()!;
+    expect(corv).toBeDefined();
+    expect(corv.hp).toBeLessThan(corv.getMaxHp());
+  });
+
+  it("should succeed if recalled and sent back out", async () => {
     await game.classicMode.startBattle([Species.FEEBAS, Species.MAGIKARP]);
 
-    const enemy1 = game.scene.getEnemyPokemon()!;
-
-    game.move.select(Moves.FAKE_OUT);
-    await game.phaseInterceptor.to("MoveEndPhase");
-
-    expect(enemy1.hp).toBeLessThan(enemy1.getMaxHp());
-
-    await game.doKillOpponents();
-    await game.toNextWave();
-
     game.move.select(Moves.FAKE_OUT);
     await game.toNextTurn();
 
-    const enemy2 = game.scene.getEnemyPokemon()!;
+    const corv = game.scene.getEnemyPokemon()!;
 
-    expect(enemy2.hp).toBeLessThan(enemy2.getMaxHp());
-    enemy2.hp = enemy2.getMaxHp();
+    expect(corv.hp).toBeLessThan(corv.getMaxHp());
+    corv.hp = corv.getMaxHp();
 
     game.doSwitchPokemon(1);
     await game.toNextTurn();
@@ -94,6 +101,6 @@ describe("Moves - Fake Out", () => {
     game.move.select(Moves.FAKE_OUT);
     await game.toNextTurn();
 
-    expect(enemy2.hp).toBeLessThan(enemy2.getMaxHp());
-  }, 20000);
+    expect(corv.hp).toBeLessThan(corv.getMaxHp());
+  });
 });

test/moves/last-resort.test.ts

@@ -0,0 +1,166 @@
+import { BattlerIndex } from "#app/battle";
+import { MoveResult } from "#app/field/pokemon";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import GameManager from "#test/testUtils/gameManager";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Moves - Last Resort", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  function expectLastResortFail() {
+    expect(game.scene.getPlayerPokemon()?.getLastXMoves()[0]).toEqual(
+      expect.objectContaining({
+        move: Moves.LAST_RESORT,
+        result: MoveResult.FAIL,
+      }),
+    );
+  }
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .ability(Abilities.BALL_FETCH)
+      .battleStyle("single")
+      .disableCrits()
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(Moves.SPLASH);
+  });
+
+  it("should fail unless all other moves (excluding itself) has been used at least once", async () => {
+    game.override.moveset([Moves.LAST_RESORT, Moves.SPLASH, Moves.GROWL, Moves.GROWTH]);
+    await game.classicMode.startBattle([Species.BLISSEY]);
+
+    const blissey = game.scene.getPlayerPokemon()!;
+    expect(blissey).toBeDefined();
+
+    // Last resort by itself
+    game.move.select(Moves.LAST_RESORT);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expectLastResortFail();
+
+    // Splash (1/3)
+    blissey.pushMoveHistory({ move: Moves.SPLASH, targets: [BattlerIndex.PLAYER] });
+    game.move.select(Moves.LAST_RESORT);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expectLastResortFail();
+
+    // Growl (2/3)
+    blissey.pushMoveHistory({ move: Moves.GROWL, targets: [BattlerIndex.ENEMY] });
+    game.move.select(Moves.LAST_RESORT);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expectLastResortFail(); // Were last resort itself counted, it would error here
+
+    // Growth (3/3)
+    blissey.pushMoveHistory({ move: Moves.GROWTH, targets: [BattlerIndex.PLAYER] });
+    game.move.select(Moves.LAST_RESORT);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(game.scene.getPlayerPokemon()?.getLastXMoves()[0]).toEqual(
+      expect.objectContaining({
+        move: Moves.LAST_RESORT,
+        result: MoveResult.SUCCESS,
+      }),
+    );
+  });
+
+  it("should disregard virtually invoked moves", async () => {
+    game.override
+      .moveset([Moves.LAST_RESORT, Moves.SWORDS_DANCE, Moves.ABSORB, Moves.MIRROR_MOVE])
+      .enemyMoveset([Moves.SWORDS_DANCE, Moves.ABSORB])
+      .ability(Abilities.DANCER)
+      .enemySpecies(Species.ABOMASNOW); // magikarp has 50% chance to be okho'd on absorb crit
+    await game.classicMode.startBattle([Species.BLISSEY]);
+
+    // use mirror move normally to trigger absorb virtually
+    game.move.select(Moves.MIRROR_MOVE);
+    await game.forceEnemyMove(Moves.ABSORB);
+    await game.toNextTurn();
+
+    game.move.select(Moves.LAST_RESORT);
+    await game.forceEnemyMove(Moves.SWORDS_DANCE); // goes first to proc dancer ahead of time
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expectLastResortFail();
+  });
+
+  it("should fail if no other moves in moveset", async () => {
+    game.override.moveset(Moves.LAST_RESORT);
+    await game.classicMode.startBattle([Species.BLISSEY]);
+
+    game.move.select(Moves.LAST_RESORT);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expectLastResortFail();
+  });
+
+  it("should work if invoked virtually when all other moves have been used", async () => {
+    game.override.moveset([Moves.LAST_RESORT, Moves.SLEEP_TALK]).ability(Abilities.COMATOSE);
+    await game.classicMode.startBattle([Species.KOMALA]);
+
+    game.move.select(Moves.SLEEP_TALK);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.getPlayerPokemon()?.getLastXMoves(-1)).toEqual([
+      expect.objectContaining({
+        move: Moves.LAST_RESORT,
+        result: MoveResult.SUCCESS,
+        virtual: true,
+      }),
+      expect.objectContaining({
+        move: Moves.SLEEP_TALK,
+        result: MoveResult.SUCCESS,
+      }),
+    ]);
+  });
+
+  it("should preserve usability status on reload", async () => {
+    game.override.moveset([Moves.LAST_RESORT, Moves.SPLASH]).ability(Abilities.COMATOSE);
+    await game.classicMode.startBattle([Species.BLISSEY]);
+
+    game.move.select(Moves.SPLASH);
+    await game.doKillOpponents();
+    await game.toNextWave();
+
+    const oldMoveHistory = game.scene.getPlayerPokemon()?.summonData.moveHistory;
+    await game.reload.reloadSession();
+
+    const newMoveHistory = game.scene.getPlayerPokemon()?.summonData.moveHistory;
+    expect(oldMoveHistory).toEqual(newMoveHistory);
+
+    // use last resort and it should kill the karp just fine
+    game.move.select(Moves.LAST_RESORT);
+    game.scene.getEnemyPokemon()!.hp = 1;
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.isVictory()).toBe(true);
+  });
+
+  it("should fail if used while not in moveset", async () => {
+    game.override.moveset(Moves.MIRROR_MOVE).enemyMoveset([Moves.ABSORB, Moves.LAST_RESORT]);
+    await game.classicMode.startBattle([Species.BLISSEY]);
+
+    // ensure enemy last resort succeeds
+    game.move.select(Moves.MIRROR_MOVE);
+    await game.forceEnemyMove(Moves.ABSORB);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.MIRROR_MOVE);
+    await game.forceEnemyMove(Moves.LAST_RESORT);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expectLastResortFail();
+  });
+});