[Item] Add Weather and Terrain Extender Item

src/data/ability.ts

@@ -848,7 +848,7 @@ export class PostDefendTerrainChangeAbAttr extends PostDefendAbAttr {
       if (simulated) {
         return pokemon.scene.arena.terrain?.terrainType !== (this.terrainType || undefined);
       } else {
-        return pokemon.scene.arena.trySetTerrain(this.terrainType, true);
+        return pokemon.scene.arena.trySetTerrain(this.terrainType, pokemon);
       }
     }
 
@@ -1031,7 +1031,7 @@ export class PostDefendWeatherChangeAbAttr extends PostDefendAbAttr {
       if (simulated) {
         return pokemon.scene.arena.weather?.weatherType !== this.weatherType;
       }
-      return pokemon.scene.arena.trySetWeather(this.weatherType, true);
+      return pokemon.scene.arena.trySetWeather(this.weatherType, pokemon);
     }
 
     return false;
@@ -2294,7 +2294,7 @@ export class PostSummonWeatherChangeAbAttr extends PostSummonAbAttr {
       if (simulated) {
         return pokemon.scene.arena.weather?.weatherType !== this.weatherType;
       } else {
-        return pokemon.scene.arena.trySetWeather(this.weatherType, true);
+        return pokemon.scene.arena.trySetWeather(this.weatherType, pokemon);
       }
     }
 
@@ -2315,7 +2315,7 @@ export class PostSummonTerrainChangeAbAttr extends PostSummonAbAttr {
     if (simulated) {
       return pokemon.scene.arena.terrain?.terrainType !== this.terrainType;
     } else {
-      return pokemon.scene.arena.trySetTerrain(this.terrainType, true);
+      return pokemon.scene.arena.trySetTerrain(this.terrainType, pokemon);
     }
   }
 }
@@ -2658,7 +2658,7 @@ export class PreSwitchOutClearWeatherAbAttr extends PreSwitchOutAbAttr {
     }
 
     if (turnOffWeather) {
-      pokemon.scene.arena.trySetWeather(WeatherType.NONE, false);
+      pokemon.scene.arena.trySetWeather(WeatherType.NONE, pokemon);
       return true;
     }
 
@@ -3768,7 +3768,7 @@ export class PostBiomeChangeWeatherChangeAbAttr extends PostBiomeChangeAbAttr {
       if (simulated) {
         return pokemon.scene.arena.weather?.weatherType !== this.weatherType;
       } else {
-        return pokemon.scene.arena.trySetWeather(this.weatherType, true);
+        return pokemon.scene.arena.trySetWeather(this.weatherType, pokemon);
       }
     }
 
@@ -3789,7 +3789,7 @@ export class PostBiomeChangeTerrainChangeAbAttr extends PostBiomeChangeAbAttr {
     if (simulated) {
       return pokemon.scene.arena.terrain?.terrainType !== this.terrainType;
     } else {
-      return pokemon.scene.arena.trySetTerrain(this.terrainType, true);
+      return pokemon.scene.arena.trySetTerrain(this.terrainType, pokemon);
     }
   }
 }
@@ -4190,7 +4190,7 @@ export class PostFaintClearWeatherAbAttr extends PostFaintAbAttr {
     }
 
     if (turnOffWeather) {
-      pokemon.scene.arena.trySetWeather(WeatherType.NONE, false);
+      pokemon.scene.arena.trySetWeather(WeatherType.NONE);
       return true;
     }
 

src/data/move.ts

@@ -2641,7 +2641,7 @@ export class WeatherChangeAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    return user.scene.arena.trySetWeather(this.weatherType, true);
+    return user.scene.arena.trySetWeather(this.weatherType, user);
   }
 
   getCondition(): MoveConditionFunc {
@@ -2660,7 +2660,7 @@ export class ClearWeatherAttr extends MoveEffectAttr {
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
     if (user.scene.arena.weather?.weatherType === this.weatherType) {
-      return user.scene.arena.trySetWeather(WeatherType.NONE, true);
+      return user.scene.arena.trySetWeather(WeatherType.NONE, user);
     }
 
     return false;
@@ -2677,7 +2677,7 @@ export class TerrainChangeAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    return user.scene.arena.trySetTerrain(this.terrainType, true, true);
+    return user.scene.arena.trySetTerrain(this.terrainType, user, true);
   }
 
   getCondition(): MoveConditionFunc {
@@ -2696,7 +2696,7 @@ export class ClearTerrainAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    return user.scene.arena.trySetTerrain(TerrainType.NONE, true, true);
+    return user.scene.arena.trySetTerrain(TerrainType.NONE, user, true);
   }
 }
 
@@ -5998,7 +5998,7 @@ export class ForceSwitchOutAttr extends MoveEffectAttr {
 
 export class ChillyReceptionAttr extends ForceSwitchOutAttr {
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    user.scene.arena.trySetWeather(WeatherType.SNOW, true);
+    user.scene.arena.trySetWeather(WeatherType.SNOW, user);
     return super.apply(user, target, move, args);
   }
 

src/data/mystery-encounters/encounters/fiery-fallout-encounter.ts

@@ -115,7 +115,7 @@ export const FieryFalloutEncounter: MysteryEncounter =
       // Load animations/sfx for Volcarona moves
       loadCustomMovesForEncounter(scene, [ Moves.FIRE_SPIN, Moves.QUIVER_DANCE ]);
 
-      scene.arena.trySetWeather(WeatherType.SUNNY, true);
+      scene.arena.trySetWeather(WeatherType.SUNNY); // TODO: This breaks the duration
 
       encounter.setDialogueToken("volcaronaName", getPokemonSpecies(Species.VOLCARONA).getName());
 

src/field/arena.ts

@@ -31,6 +31,7 @@ import { Abilities } from "#enums/abilities";
 import { SpeciesFormChangeRevertWeatherFormTrigger, SpeciesFormChangeWeatherTrigger } from "#app/data/pokemon-forms";
 import { CommonAnimPhase } from "#app/phases/common-anim-phase";
 import { ShowAbilityPhase } from "#app/phases/show-ability-phase";
+import { FieldEffectModifier } from "#app/modifier/modifier";
 
 export class Arena {
   public scene: BattleScene;
@@ -253,7 +254,7 @@ export class Arena {
    * @param hasPokemonSource boolean if the new weather is from a pokemon
    * @returns true if new weather set, false if no weather provided or attempting to set the same weather as currently in use
    */
-  trySetWeather(weather: WeatherType, hasPokemonSource: boolean): boolean {
+  trySetWeather(weather: WeatherType, user?: Pokemon): boolean {
     if (Overrides.WEATHER_OVERRIDE) {
       return this.trySetWeatherOverride(Overrides.WEATHER_OVERRIDE);
     }
@@ -264,7 +265,14 @@ export class Arena {
 
     const oldWeatherType = this.weather?.weatherType || WeatherType.NONE;
 
-    this.weather = weather ? new Weather(weather, hasPokemonSource ? 5 : 0) : null;
+    const weatherDuration = new Utils.NumberHolder(0);
+
+    if (!Utils.isNullOrUndefined(user)) {
+      weatherDuration.value = 5;
+      this.scene.applyModifier(FieldEffectModifier, user.isPlayer(), user, weatherDuration);
+    }
+
+    this.weather = weather ? new Weather(weather, weatherDuration.value) : null;
     this.eventTarget.dispatchEvent(new WeatherChangedEvent(oldWeatherType, this.weather?.weatherType!, this.weather?.turnsLeft!)); // TODO: is this bang correct?
 
     if (this.weather) {
@@ -312,14 +320,21 @@ export class Arena {
     });
   }
 
-  trySetTerrain(terrain: TerrainType, hasPokemonSource: boolean, ignoreAnim: boolean = false): boolean {
+  trySetTerrain(terrain: TerrainType, user?: Pokemon, ignoreAnim: boolean = false): boolean {
     if (this.terrain?.terrainType === (terrain || undefined)) {
       return false;
     }
 
     const oldTerrainType = this.terrain?.terrainType || TerrainType.NONE;
 
-    this.terrain = terrain ? new Terrain(terrain, hasPokemonSource ? 5 : 0) : null;
+    const terrainDuration = new Utils.NumberHolder(0);
+
+    if (!Utils.isNullOrUndefined(user)) {
+      terrainDuration.value = 5;
+      this.scene.applyModifier(FieldEffectModifier, user.isPlayer(), user, terrainDuration);
+    }
+
+    this.terrain = terrain ? new Terrain(terrain, terrainDuration.value) : null;
     this.eventTarget.dispatchEvent(new TerrainChangedEvent(oldTerrainType, this.terrain?.terrainType!, this.terrain?.turnsLeft!)); // TODO: are those bangs correct?
 
     if (this.terrain) {
@@ -683,9 +698,9 @@ export class Arena {
   resetArenaEffects(): void {
     // Don't reset weather if a Biome's permanent weather is active
     if (this.weather?.turnsLeft !== 0) {
-      this.trySetWeather(WeatherType.NONE, false);
+      this.trySetWeather(WeatherType.NONE);
     }
-    this.trySetTerrain(TerrainType.NONE, false, true);
+    this.trySetTerrain(TerrainType.NONE, undefined, true);
     this.removeAllTags();
   }
 

src/modifier/modifier-type.ts

@@ -11,7 +11,7 @@ import { Type } from "#app/data/type";
 import Pokemon, { EnemyPokemon, PlayerPokemon, PokemonMove } from "#app/field/pokemon";
 import { getPokemonNameWithAffix } from "#app/messages";
 import {
-  AddPokeballModifier, AddVoucherModifier, AttackTypeBoosterModifier, BaseStatModifier, BerryModifier, BoostBugSpawnModifier, BypassSpeedChanceModifier, ContactHeldItemTransferChanceModifier, CritBoosterModifier, DamageMoneyRewardModifier, DoubleBattleChanceBoosterModifier, EnemyAttackStatusEffectChanceModifier, EnemyDamageBoosterModifier, EnemyDamageReducerModifier, EnemyEndureChanceModifier, EnemyFusionChanceModifier, EnemyStatusEffectHealChanceModifier, EnemyTurnHealModifier, EvolutionItemModifier, EvolutionStatBoosterModifier, EvoTrackerModifier, ExpBalanceModifier, ExpBoosterModifier, ExpShareModifier, ExtraModifierModifier, FlinchChanceModifier, FusePokemonModifier, GigantamaxAccessModifier, HealingBoosterModifier, HealShopCostModifier, HiddenAbilityRateBoosterModifier, HitHealModifier, IvScannerModifier, LevelIncrementBoosterModifier, LockModifierTiersModifier, MapModifier, MegaEvolutionAccessModifier, MoneyInterestModifier, MoneyMultiplierModifier, MoneyRewardModifier, MultipleParticipantExpBonusModifier, PokemonAllMovePpRestoreModifier, PokemonBaseStatFlatModifier, PokemonBaseStatTotalModifier, PokemonExpBoosterModifier, PokemonFormChangeItemModifier, PokemonFriendshipBoosterModifier, PokemonHeldItemModifier, PokemonHpRestoreModifier, PokemonIncrementingStatModifier, PokemonInstantReviveModifier, PokemonLevelIncrementModifier, PokemonMoveAccuracyBoosterModifier, PokemonMultiHitModifier, PokemonNatureChangeModifier, PokemonNatureWeightModifier, PokemonPpRestoreModifier, PokemonPpUpModifier, PokemonStatusHealModifier, PreserveBerryModifier, RememberMoveModifier, ResetNegativeStatStageModifier, ShinyRateBoosterModifier, SpeciesCritBoosterModifier, SpeciesStatBoosterModifier, SurviveDamageModifier, SwitchEffectTransferModifier, TempCritBoosterModifier, TempStatStageBoosterModifier, TerastallizeAccessModifier, TerastallizeModifier, TmModifier, TurnHealModifier, TurnHeldItemTransferModifier, TurnStatusEffectModifier, type EnemyPersistentModifier, type Modifier, type PersistentModifier, TempExtraModifierModifier
+  AddPokeballModifier, AddVoucherModifier, AttackTypeBoosterModifier, BaseStatModifier, BerryModifier, BoostBugSpawnModifier, BypassSpeedChanceModifier, ContactHeldItemTransferChanceModifier, CritBoosterModifier, DamageMoneyRewardModifier, DoubleBattleChanceBoosterModifier, EnemyAttackStatusEffectChanceModifier, EnemyDamageBoosterModifier, EnemyDamageReducerModifier, EnemyEndureChanceModifier, EnemyFusionChanceModifier, EnemyStatusEffectHealChanceModifier, EnemyTurnHealModifier, EvolutionItemModifier, EvolutionStatBoosterModifier, EvoTrackerModifier, ExpBalanceModifier, ExpBoosterModifier, ExpShareModifier, ExtraModifierModifier, FlinchChanceModifier, FusePokemonModifier, GigantamaxAccessModifier, HealingBoosterModifier, HealShopCostModifier, HiddenAbilityRateBoosterModifier, HitHealModifier, IvScannerModifier, LevelIncrementBoosterModifier, LockModifierTiersModifier, MapModifier, MegaEvolutionAccessModifier, MoneyInterestModifier, MoneyMultiplierModifier, MoneyRewardModifier, MultipleParticipantExpBonusModifier, PokemonAllMovePpRestoreModifier, PokemonBaseStatFlatModifier, PokemonBaseStatTotalModifier, PokemonExpBoosterModifier, PokemonFormChangeItemModifier, PokemonFriendshipBoosterModifier, PokemonHeldItemModifier, PokemonHpRestoreModifier, PokemonIncrementingStatModifier, PokemonInstantReviveModifier, PokemonLevelIncrementModifier, PokemonMoveAccuracyBoosterModifier, PokemonMultiHitModifier, PokemonNatureChangeModifier, PokemonNatureWeightModifier, PokemonPpRestoreModifier, PokemonPpUpModifier, PokemonStatusHealModifier, PreserveBerryModifier, RememberMoveModifier, ResetNegativeStatStageModifier, ShinyRateBoosterModifier, SpeciesCritBoosterModifier, SpeciesStatBoosterModifier, SurviveDamageModifier, SwitchEffectTransferModifier, TempCritBoosterModifier, TempStatStageBoosterModifier, TerastallizeAccessModifier, TerastallizeModifier, TmModifier, TurnHealModifier, TurnHeldItemTransferModifier, TurnStatusEffectModifier, type EnemyPersistentModifier, type Modifier, type PersistentModifier, TempExtraModifierModifier, FieldEffectModifier
 } from "#app/modifier/modifier";
 import { ModifierTier } from "#app/modifier/modifier-tier";
 import Overrides from "#app/overrides";
@@ -1490,6 +1490,8 @@ export const modifierTypes = {
     return new BerryModifierType(randBerryType);
   }),
 
+  DOMAIN_EXPANDER: () => new ModifierType("modifierType:ModifierType.DOMAIN_EXPANDER", "domain_expander", (type, args) => new FieldEffectModifier(type, (args[0] as Pokemon).id)),
+
   TM_COMMON: () => new TmModifierTypeGenerator(ModifierTier.COMMON),
   TM_GREAT: () => new TmModifierTypeGenerator(ModifierTier.GREAT),
   TM_ULTRA: () => new TmModifierTypeGenerator(ModifierTier.ULTRA),

src/modifier/modifier.ts

@@ -1995,6 +1995,29 @@ export class ResetNegativeStatStageModifier extends PokemonHeldItemModifier {
   }
 }
 
+export class FieldEffectModifier extends PokemonHeldItemModifier {
+  constructor(type: ModifierType, pokemonId: number, stackCount?: number) {
+    super(type, pokemonId, stackCount);
+  }
+
+  override apply(_pokemon: Pokemon, fieldDuration: NumberHolder): boolean {
+    fieldDuration.value += 2 * this.stackCount;
+    return true;
+  }
+
+  override matchType(modifier: Modifier): boolean {
+    return modifier instanceof FieldEffectModifier;
+  }
+
+  override clone(): FieldEffectModifier {
+    return new FieldEffectModifier(this.type, this.pokemonId, this.stackCount);
+  }
+
+  override getMaxHeldItemCount(_pokemon?: Pokemon): number {
+    return 2;
+  }
+}
+
 export abstract class ConsumablePokemonModifier extends ConsumableModifier {
   public pokemonId: number;
 

src/phases/encounter-phase.ts

@@ -541,7 +541,7 @@ export class EncounterPhase extends BattlePhase {
    */
   trySetWeatherIfNewBiome(): void {
     if (!this.loaded) {
-      this.scene.arena.trySetWeather(getRandomWeatherType(this.scene.arena), false);
+      this.scene.arena.trySetWeather(getRandomWeatherType(this.scene.arena));
     }
   }
 }

src/phases/new-biome-encounter-phase.ts

@@ -44,6 +44,6 @@ export class NewBiomeEncounterPhase extends NextEncounterPhase {
    * Set biome weather.
    */
   trySetWeatherIfNewBiome(): void {
-    this.scene.arena.trySetWeather(getRandomWeatherType(this.scene.arena), false);
+    this.scene.arena.trySetWeather(getRandomWeatherType(this.scene.arena));
   }
 }

src/phases/turn-end-phase.ts

@@ -52,12 +52,12 @@ export class TurnEndPhase extends FieldPhase {
     this.scene.arena.lapseTags();
 
     if (this.scene.arena.weather && !this.scene.arena.weather.lapse()) {
-      this.scene.arena.trySetWeather(WeatherType.NONE, false);
+      this.scene.arena.trySetWeather(WeatherType.NONE);
       this.scene.arena.triggerWeatherBasedFormChangesToNormal();
     }
 
     if (this.scene.arena.terrain && !this.scene.arena.terrain.lapse()) {
-      this.scene.arena.trySetTerrain(TerrainType.NONE, false);
+      this.scene.arena.trySetTerrain(TerrainType.NONE);
     }
 
     this.end();

src/test/abilities/forecast.test.ts

@@ -172,7 +172,7 @@ describe("Abilities - Forecast", () => {
 
     expect(castform.formIndex).toBe(SNOWY_FORM);
 
-    game.scene.arena.trySetWeather(WeatherType.FOG, false);
+    game.scene.arena.trySetWeather(WeatherType.FOG);
     game.move.select(Moves.SPLASH);
     game.move.select(Moves.SPLASH, 1);
     await game.phaseInterceptor.to("TurnStartPhase");

src/test/moves/dive.test.ts

@@ -124,7 +124,7 @@ describe("Moves - Dive", () => {
 
     await game.phaseInterceptor.to("TurnEndPhase");
     await game.phaseInterceptor.to("TurnStartPhase", false);
-    game.scene.arena.trySetWeather(WeatherType.HARSH_SUN, false);
+    game.scene.arena.trySetWeather(WeatherType.HARSH_SUN);
 
     await game.phaseInterceptor.to("MoveEndPhase");
     expect(playerPokemon.getLastXMoves(1)[0].result).toBe(MoveResult.FAIL);