cleaned up code making it more general

src/data/move.ts

@@ -4934,32 +4934,42 @@ export class NeutralDamageAgainstFlyingTypeMultiplierAttr extends VariableMoveTy
   }
 }
 
+/**
+ * This class forces Freeze-Dry to be super effective against Water Type.
+ * It considers if target is Mono or Dual Type and calculates the new Multiplier accordingly
+ */
 export class FreezeDryAttr extends VariableMoveTypeMultiplierAttr {
+  /**
+   * If the target is Mono Type (Water only) then a 2x Multiplier is always forced.
+   * If target is Dual Type (containing Water) then only a 2x Multiplier is forced for the Water Type
+   *
+   * Additionally Freeze-Dry's effectiveness against water is always forced during {@linkcode InverseBattleChallenge}.
+   * The multiplier is recalculated for the non-Water Type in case of Dual Type targets containing Water Type.
+   *
+   * @param user The {@linkcode Pokemon} applying the move
+   * @param target The {@linkcode Pokemon} targeted by the move
+   * @param move The move used by the user
+   * @param args `[0]` a {@linkcode Utils.NumberHolder | NumberHolder} containing a type effectiveness multiplier
+   * @returns `true` if super effectiveness on water type is forced; `false` otherwise
+   */
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
     const multiplier = args[0] as Utils.NumberHolder;
-    if (target.isOfType(Type.WATER)) {
-      const effectivenessAgainstWater = new Utils.NumberHolder(getTypeDamageMultiplier(move.type, Type.WATER));
-      applyChallenges(user.scene.gameMode, ChallengeType.TYPE_EFFECTIVENESS, effectivenessAgainstWater);
-      if (effectivenessAgainstWater.value !== 0) {
-        /**
-         * During Normalize the given multiplier value against water Pkm is 1x but should be 2x.
-         *
-         * For more information about special interactions visit [Bulbapedia](https://bulbapedia.bulbagarden.net/wiki/Freeze-Dry_(move))
-         */
-        if (user.hasAbility(Abilities.NORMALIZE)) {
+    if (target.isOfType(Type.WATER) && multiplier.value !== 0) {
+      const multipleTypes = new Utils.BooleanHolder(target.getTypes().length > 1);
+
+      if (multipleTypes) {
+        const effectivenessAgainstTarget = new Utils.NumberHolder(getTypeDamageMultiplier(move.type, target.getTypes().filter(types => types !== Type.WATER)[0]));
+
+        applyChallenges(user.scene.gameMode, ChallengeType.TYPE_EFFECTIVENESS, effectivenessAgainstTarget);
+
+        multiplier.value = effectivenessAgainstTarget.value;
         multiplier.value *= 2;
         return true;
       }
 
-        /**
-         * If move is of type electric it already has super effectiveness against water types and multiplier does not need to recalculate its value.
-         */
-        if (user.getMoveType(move) !== Type.ELECTRIC) {
-          multiplier.value *= 2 / effectivenessAgainstWater.value;
-        }
+      multiplier.value = 2;
       return true;
     }
-    }
 
     return false;
   }

src/test/moves/freeze_dry.test.ts

@@ -192,4 +192,61 @@ describe("Moves - Freeze-Dry", () => {
 
     expect(enemy.getMoveEffectiveness).toHaveLastReturnedWith(2);
   });
+
+  it("should deal 2x damage to Water type during inverse battle under Normalize", async () => {
+    game.override
+      .moveset([ Moves.FREEZE_DRY ])
+      .ability(Abilities.NORMALIZE)
+      .enemySpecies(Species.MAGIKARP);
+    game.challengeMode.addChallenge(Challenges.INVERSE_BATTLE, 1, 1);
+
+    await game.challengeMode.startBattle();
+
+    const enemy = game.scene.getEnemyPokemon()!;
+    vi.spyOn(enemy, "getMoveEffectiveness");
+
+    game.move.select(Moves.FREEZE_DRY);
+    await game.setTurnOrder([ BattlerIndex.PLAYER, BattlerIndex.ENEMY ]);
+    await game.phaseInterceptor.to("MoveEffectPhase");
+
+    expect(enemy.getMoveEffectiveness).toHaveLastReturnedWith(2);
+  });
+
+  it("should deal 2x damage to Water type during inverse battle under Electrify", async () => {
+    game.override
+      .moveset([ Moves.FREEZE_DRY ])
+      .enemySpecies(Species.MAGIKARP)
+      .enemyMoveset([ Moves.ELECTRIFY ]);
+    game.challengeMode.addChallenge(Challenges.INVERSE_BATTLE, 1, 1);
+
+    await game.challengeMode.startBattle();
+
+    const enemy = game.scene.getEnemyPokemon()!;
+    vi.spyOn(enemy, "getMoveEffectiveness");
+
+    game.move.select(Moves.FREEZE_DRY);
+    await game.setTurnOrder([ BattlerIndex.ENEMY, BattlerIndex.PLAYER ]);
+    await game.phaseInterceptor.to("MoveEffectPhase");
+
+    expect(enemy.getMoveEffectiveness).toHaveLastReturnedWith(2);
+  });
+
+  it("should deal 1x damage to water/flying type during inverse battle under Electrify", async () => {
+    game.override
+      .enemyMoveset([ Moves.ELECTRIFY ])
+      .enemySpecies(Species.GYARADOS);
+
+    game.challengeMode.addChallenge(Challenges.INVERSE_BATTLE, 1, 1);
+
+    await game.challengeMode.startBattle();
+
+    const enemy = game.scene.getEnemyPokemon()!;
+    vi.spyOn(enemy, "getMoveEffectiveness");
+
+    game.move.select(Moves.FREEZE_DRY);
+    await game.setTurnOrder([ BattlerIndex.ENEMY, BattlerIndex.PLAYER ]);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(enemy.getMoveEffectiveness).toHaveReturnedWith(1);
+  });
 });