[Bug] Prevent pokemon with 0 HP from being statused (#5137)

* [Bug] Prevent pokemon with 0 HP from being statused

* Update test

* Move check to `trySetStatus()` and update test

src/field/pokemon.ts

@@ -3606,6 +3606,9 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     if (!this.canSetStatus(effect, asPhase, false, sourcePokemon)) {
       return false;
     }
+    if (this.isFainted() && effect !== StatusEffect.FAINT) {
+      return false;
+    }
 
     /**
      * If this Pokemon falls asleep or freezes in the middle of a multi-hit attack,

src/test/data/status_effect.test.ts

@@ -400,4 +400,42 @@ describe("Status Effects", () => {
       expect(player.getLastXMoves(1)[0].result).toBe(MoveResult.SUCCESS);
     });
   });
+
+  describe("Behavior", () => {
+    let phaserGame: Phaser.Game;
+    let game: GameManager;
+
+    beforeAll(() => {
+      phaserGame = new Phaser.Game({
+        type: Phaser.HEADLESS,
+      });
+    });
+
+    afterEach(() => {
+      game.phaseInterceptor.restoreOg();
+    });
+
+    beforeEach(() => {
+      game = new GameManager(phaserGame);
+      game.override
+        .moveset([ Moves.SPLASH ])
+        .ability(Abilities.BALL_FETCH)
+        .battleType("single")
+        .disableCrits()
+        .enemySpecies(Species.MAGIKARP)
+        .enemyAbility(Abilities.BALL_FETCH)
+        .enemyMoveset(Moves.NUZZLE)
+        .enemyLevel(2000);
+    });
+
+    it("should not inflict a 0 HP mon with a status", async () => {
+      await game.classicMode.startBattle([ Species.FEEBAS, Species.MILOTIC ]);
+
+      const player = game.scene.getPlayerPokemon()!;
+      player.hp = 0;
+
+      expect(player.trySetStatus(StatusEffect.BURN)).toBe(false);
+      expect(player.status?.effect).not.toBe(StatusEffect.BURN);
+    });
+  });
 });

src/utils.ts

@@ -349,14 +349,14 @@ export class IntegerHolder extends NumberHolder {
   }
 }
 
-/** @deprecated Use {@linkcode NumberHolder}*/
-export class FixedInt extends IntegerHolder {
-  constructor(value: integer) {
-    super(value);
+export class FixedInt {
+  public readonly value: number;
+
+  constructor(value: number) {
+    this.value = value;
   }
 }
 
-/** @deprecated */
 export function fixedInt(value: integer): integer {
   return new FixedInt(value) as unknown as integer;
 }