[Bug Fix] Correct PostSummonPhase Timing for Abilities and Entry Hazards (#2108)

* added test for spikes + forceOpponentToSwitch

* added conditionalQueue && pushConditionalPhase to fix entry hasard and abilities at post summon

* reduce timeout time to default

src/battle-scene.ts

@@ -168,6 +168,7 @@ export default class BattleScene extends SceneBase {
   public sessionSlotId: integer;
 
   public phaseQueue: Phase[];
+  public conditionalQueue: Array<[() => boolean, Phase]>;
   private phaseQueuePrepend: Phase[];
   private phaseQueuePrependSpliceIndex: integer;
   private nextCommandPhaseQueue: Phase[];
@@ -252,6 +253,7 @@ export default class BattleScene extends SceneBase {
     super("battle");
     this.phaseQueue = [];
     this.phaseQueuePrepend = [];
+    this.conditionalQueue = [];
     this.phaseQueuePrependSpliceIndex = -1;
     this.nextCommandPhaseQueue = [];
     this.updateGameInfo();
@@ -1843,6 +1845,21 @@ export default class BattleScene extends SceneBase {
     return this.standbyPhase;
   }
 
+  /**
+   * Adds a phase to the conditional queue and ensures it is executed only when the specified condition is met.
+   *
+   * This method allows deferring the execution of a phase until certain conditions are met, which is useful for handling
+   * situations like abilities and entry hazards that depend on specific game states.
+   *
+   * @param {Phase} phase - The phase to be added to the conditional queue.
+   * @param {() => boolean} condition - A function that returns a boolean indicating whether the phase should be executed.
+   *
+   */
+  pushConditionalPhase(phase: Phase, condition: () => boolean): void {
+    this.conditionalQueue.push([condition, phase]);
+  }
+
+
   pushPhase(phase: Phase, defer: boolean = false): void {
     (!defer ? this.phaseQueue : this.nextCommandPhaseQueue).push(phase);
   }
@@ -1886,6 +1903,21 @@ export default class BattleScene extends SceneBase {
       this.populatePhaseQueue();
     }
     this.currentPhase = this.phaseQueue.shift();
+
+    // Check if there are any conditional phases queued
+    if (this.conditionalQueue?.length) {
+      // Retrieve the first conditional phase from the queue
+      const conditionalPhase = this.conditionalQueue.shift();
+      // Evaluate the condition associated with the phase
+      if (conditionalPhase[0]()) {
+        // If the condition is met, add the phase to the front of the phase queue
+        this.unshiftPhase(conditionalPhase[1]);
+      } else {
+        // If the condition is not met, re-add the phase back to the front of the conditional queue
+        this.conditionalQueue.unshift(conditionalPhase);
+      }
+    }
+
     this.currentPhase.start();
   }
 

src/phases.ts

@@ -1024,6 +1024,15 @@ export class EncounterPhase extends BattlePhase {
     });
 
     if (this.scene.currentBattle.battleType !== BattleType.TRAINER) {
+      enemyField.map(p => this.scene.pushConditionalPhase(new PostSummonPhase(this.scene, p.getBattlerIndex()), () => {
+        // is the player party initialized ?
+        const a = !!this.scene.getParty()?.length;
+        // how many player pokemon are on the field ?
+        const amountOnTheField = this.scene.getParty().filter(p => p.isOnField()).length;
+        // if it's a double, there should be 2, otherwise 1
+        const b = this.scene.currentBattle.double ? amountOnTheField === 2 : amountOnTheField === 1;
+        return a && b;
+      }));
       const ivScannerModifier = this.scene.findModifier(m => m instanceof IvScannerModifier);
       if (ivScannerModifier) {
         enemyField.map(p => this.scene.pushPhase(new ScanIvsPhase(this.scene, p.getBattlerIndex(), Math.min(ivScannerModifier.getStackCount() * 2, 6))));
@@ -1479,10 +1488,6 @@ export class SummonPhase extends PartyMemberPokemonPhase {
 
     if (!this.loaded || this.scene.currentBattle.battleType === BattleType.TRAINER || (this.scene.currentBattle.waveIndex % 10) === 1) {
       this.scene.triggerPokemonFormChange(pokemon, SpeciesFormChangeActiveTrigger, true);
-    }
-    if (pokemon.isPlayer()) {
-      // postSummon for player only here, since we want the postSummon from opponent to be call in the turnInitPhase
-      // covering both wild & trainer battles
       this.queuePostSummon();
     }
   }
@@ -1797,13 +1802,6 @@ export class TurnInitPhase extends FieldPhase {
 
   start() {
     super.start();
-    const enemyField = this.scene.getEnemyField().filter(p => p.isActive()) as Pokemon[];
-    enemyField.map(p => {
-      if (p.battleSummonData.turnCount !== 1) {
-        return;
-      }
-      return this.scene.unshiftPhase(new PostSummonPhase(this.scene, p.getBattlerIndex()));
-    });
 
     this.scene.getPlayerField().forEach(p => {
       // If this pokemon is in play and evolved into something illegal under the current challenge, force a switch

src/test/moves/spikes.test.ts

@@ -0,0 +1,128 @@
+import {afterEach, beforeAll, beforeEach, describe, expect, it, vi} from "vitest";
+import Phaser from "phaser";
+import GameManager from "#app/test/utils/gameManager";
+import * as overrides from "#app/overrides";
+import {Abilities} from "#app/data/enums/abilities";
+import {Species} from "#app/data/enums/species";
+import {
+  CommandPhase
+} from "#app/phases";
+import {Moves} from "#app/data/enums/moves";
+
+
+describe("Moves - Spikes", () => {
+  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.scene.battleStyle = 1;
+    vi.spyOn(overrides, "SINGLE_BATTLE_OVERRIDE", "get").mockReturnValue(true);
+    vi.spyOn(overrides, "OPP_SPECIES_OVERRIDE", "get").mockReturnValue(Species.RATTATA);
+    vi.spyOn(overrides, "OPP_ABILITY_OVERRIDE", "get").mockReturnValue(Abilities.HYDRATION);
+    vi.spyOn(overrides, "OPP_PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(Abilities.HYDRATION);
+    vi.spyOn(overrides, "ABILITY_OVERRIDE", "get").mockReturnValue(Abilities.HYDRATION);
+    vi.spyOn(overrides, "PASSIVE_ABILITY_OVERRIDE", "get").mockReturnValue(Abilities.HYDRATION);
+    vi.spyOn(overrides, "STARTING_WAVE_OVERRIDE", "get").mockReturnValue(3);
+    vi.spyOn(overrides, "OPP_MOVESET_OVERRIDE", "get").mockReturnValue([Moves.SPLASH,Moves.SPLASH,Moves.SPLASH,Moves.SPLASH]);
+    vi.spyOn(overrides, "MOVESET_OVERRIDE", "get").mockReturnValue([Moves.SPIKES,Moves.SPLASH, Moves.ROAR]);
+  });
+
+  it("single - wild - stay on field - no damage", async() => {
+    // player set spikes on the field and do splash for 3 turns
+    // opponent do splash for 4 turns
+    // nobody should take damage
+    await game.runToSummon([
+      Species.MIGHTYENA,
+      Species.POOCHYENA,
+    ]);
+    await game.phaseInterceptor.to(CommandPhase, true);
+    const initialHp = game.scene.getParty()[0].hp;
+    expect(game.scene.getParty()[0].hp).toBe(initialHp);
+    game.doAttack(0);
+    await game.toNextTurn();
+    game.doAttack(1);
+    await game.toNextTurn();
+    game.doAttack(1);
+    await game.toNextTurn();
+    game.doAttack(1);
+    await game.toNextTurn();
+    game.doAttack(1);
+    await game.toNextTurn();
+    expect(game.scene.getParty()[0].hp).toBe(initialHp);
+    console.log(game.textInterceptor.logs);
+  }, 20000);
+
+  it("single - wild - take some damage", async() => {
+    // player set spikes on the field and switch back to back
+    // opponent do splash for 2 turns
+    // nobody should take damage
+    await game.runToSummon([
+      Species.MIGHTYENA,
+      Species.POOCHYENA,
+    ]);
+    await game.phaseInterceptor.to(CommandPhase, false);
+
+    const initialHp = game.scene.getParty()[0].hp;
+    await game.switchPokemon(1, false);
+    await game.phaseInterceptor.run(CommandPhase);
+    await game.phaseInterceptor.to(CommandPhase, false);
+
+    await game.switchPokemon(1, false);
+    await game.phaseInterceptor.run(CommandPhase);
+    await game.phaseInterceptor.to(CommandPhase, false);
+
+    expect(game.scene.getParty()[0].hp).toBe(initialHp);
+  }, 20000);
+
+  it("trainer - wild - force switch opponent - should take damage", async() => {
+    vi.spyOn(overrides, "STARTING_WAVE_OVERRIDE", "get").mockReturnValue(5);
+    // player set spikes on the field and do splash for 3 turns
+    // opponent do splash for 4 turns
+    // nobody should take damage
+    await game.runToSummon([
+      Species.MIGHTYENA,
+      Species.POOCHYENA,
+    ]);
+    await game.phaseInterceptor.to(CommandPhase, true);
+    const initialHpOpponent = game.scene.currentBattle.enemyParty[1].hp;
+    game.doAttack(0);
+    await game.toNextTurn();
+    game.doAttack(2);
+    await game.toNextTurn();
+    expect(game.scene.currentBattle.enemyParty[0].hp).toBeLessThan(initialHpOpponent);
+  }, 20000);
+
+  it("trainer - wild - force switch by himself opponent - should take damage", async() => {
+    vi.spyOn(overrides, "STARTING_WAVE_OVERRIDE", "get").mockReturnValue(5);
+    vi.spyOn(overrides, "STARTING_LEVEL_OVERRIDE", "get").mockReturnValue(5000);
+    vi.spyOn(overrides, "OPP_SPECIES_OVERRIDE", "get").mockReturnValue(0);
+    // turn 1: player set spikes, opponent do splash
+    // turn 2: player do splash, opponent switch pokemon
+    // opponent pokemon should trigger spikes and lose HP
+    await game.runToSummon([
+      Species.MIGHTYENA,
+      Species.POOCHYENA,
+    ]);
+    await game.phaseInterceptor.to(CommandPhase, true);
+    const initialHpOpponent = game.scene.currentBattle.enemyParty[1].hp;
+    game.doAttack(0);
+    await game.toNextTurn();
+
+    game.forceOpponentToSwitch();
+    game.doAttack(1);
+    await game.toNextTurn();
+    expect(game.scene.currentBattle.enemyParty[0].hp).toBeLessThan(initialHpOpponent);
+  }, 20000);
+
+});

src/test/utils/TextInterceptor.ts

@@ -7,6 +7,7 @@ export default class TextInterceptor {
   }
 
   showText(text: string, delay?: integer, callback?: Function, callbackDelay?: integer, prompt?: boolean, promptDelay?: integer): void {
+    console.log(text);
     this.logs.push(text);
   }
 

src/test/utils/gameManager.ts

@@ -29,6 +29,7 @@ import {Command} from "#app/ui/command-ui-handler";
 import ModifierSelectUiHandler from "#app/ui/modifier-select-ui-handler";
 import {Button} from "#app/enums/buttons";
 import PartyUiHandler, {PartyUiMode} from "#app/ui/party-ui-handler";
+import Trainer from "#app/field/trainer";
 
 /**
  * Class to manage the game state and transitions between phases.
@@ -192,6 +193,14 @@ export default class GameManager {
     }, () => this.isCurrentPhase(CommandPhase) || this.isCurrentPhase(NewBattlePhase));
   }
 
+  forceOpponentToSwitch() {
+    const originalMatchupScore = Trainer.prototype.getPartyMemberMatchupScores;
+    Trainer.prototype.getPartyMemberMatchupScores = () => {
+      Trainer.prototype.getPartyMemberMatchupScores = originalMatchupScore;
+      return [[1, 100], [1, 100]];
+    };
+  }
+
   /** Transition to the next upcoming {@linkcode CommandPhase} */
   async toNextTurn() {
     await this.phaseInterceptor.to(CommandPhase);
@@ -281,14 +290,16 @@ export default class GameManager {
     });
   }
 
-  async switchPokemon(pokemonIndex: number) {
+  async switchPokemon(pokemonIndex: number, toNext: boolean = true) {
     this.onNextPrompt("CommandPhase", Mode.COMMAND, () => {
       this.scene.ui.setMode(Mode.PARTY, PartyUiMode.SWITCH, (this.scene.getCurrentPhase() as CommandPhase).getPokemon().getFieldIndex(), null, PartyUiHandler.FilterNonFainted);
     });
     this.onNextPrompt("CommandPhase", Mode.PARTY, () => {
       (this.scene.getCurrentPhase() as CommandPhase).handleCommand(Command.POKEMON, pokemonIndex, false);
     });
-    await this.phaseInterceptor.run(CommandPhase);
-    await this.phaseInterceptor.to(CommandPhase);
+    if (toNext) {
+      await this.phaseInterceptor.run(CommandPhase);
+      await this.phaseInterceptor.to(CommandPhase);
+    }
   }
 }