Add Psychic Terrain priority block effect and terrain messages

src/data/terrain.ts

@@ -1,3 +1,4 @@
+import Move from "./move";
 import { Type } from "./type";
 
 export enum TerrainType {
@@ -42,6 +43,15 @@ export class Terrain {
 
     return 1;
   }
+
+  isMoveTerrainCancelled(move: Move): boolean {
+    switch (this.terrainType) {
+      case TerrainType.PSYCHIC:
+        return move.priority > 0;
+    }
+
+    return false;
+  }
 }
 
 export function getTerrainColor(terrainType: TerrainType): [ integer, integer, integer ] {

src/data/weather.ts

@@ -194,15 +194,35 @@ export function getWeatherClearMessage(weatherType: WeatherType): string {
 }
 
 export function getTerrainStartMessage(terrainType: TerrainType): string {
-  return terrainType
+  switch (terrainType) {
-    ? `The terrain became ${Utils.toReadableString(TerrainType[terrainType])}!`
+    case TerrainType.MISTY:
-    : null;
+      return 'Mist swirled around the battlefield!';
+    case TerrainType.ELECTRIC:
+      return 'An electric current ran across the battlefield!';
+    case TerrainType.GRASSY:
+      return 'Grass grew to cover the battlefield!';
+    case TerrainType.PSYCHIC:
+      return 'The battlefield got weird!';
+  }
 }
 
 export function getTerrainClearMessage(terrainType: TerrainType): string {
-  return terrainType
+  switch (terrainType) {
-    ? `The ${Utils.toReadableString(TerrainType[terrainType])} terrain faded.`
+    case TerrainType.MISTY:
-    : null;
+      return 'The mist disappeared from the battlefield.';
+    case TerrainType.ELECTRIC:
+      return 'The electricity disappeared from the battlefield.';
+    case TerrainType.GRASSY:
+      return 'The grass disappeared from the battlefield.';
+    case TerrainType.PSYCHIC:
+      return 'The weirdness disappeared from the battlefield!';
+  }
+}
+
+export function getTerrainBlockMessage(pokemon: Pokemon, terrainType: TerrainType): string {
+  if (terrainType === TerrainType.MISTY)
+    return getPokemonMessage(pokemon, ` surrounds itself with a protective mist!`);
+  return getPokemonMessage(pokemon, ` is protected by the ${Utils.toReadableString(TerrainType[terrainType])} Terrain!`);
 }
 
 interface WeatherPoolEntry {

src/field/arena.ts

@@ -298,6 +298,10 @@ export class Arena {
     return this.weather && !this.weather.isEffectSuppressed(this.scene) && this.weather.isMoveWeatherCancelled(move);
   }
 
+  isMoveTerrainCancelled(move: Move) {
+    return this.terrain && this.terrain.isMoveTerrainCancelled(move);
+  }
+
   getAttackTypeMultiplier(attackType: Type, grounded: boolean): number {
     let weatherMultiplier = 1;
     if (this.weather && !this.weather.isEffectSuppressed(this.scene))

src/phases.ts

@@ -26,7 +26,7 @@ import { BattlerTagType } from "./data/enums/battler-tag-type";
 import { getPokemonMessage } from "./messages";
 import { Starter } from "./ui/starter-select-ui-handler";
 import { Gender } from "./data/gender";
-import { Weather, WeatherType, getRandomWeatherType, getWeatherDamageMessage, getWeatherLapseMessage } from "./data/weather";
+import { Weather, WeatherType, getRandomWeatherType, getTerrainBlockMessage, getWeatherDamageMessage, getWeatherLapseMessage } from "./data/weather";
 import { TempBattleStat } from "./data/temp-battle-stat";
 import { ArenaTagSide, ArenaTrapTag, MistTag, TrickRoomTag } from "./data/arena-tag";
 import { ArenaTagType } from "./data/enums/arena-tag-type";
@@ -2040,13 +2040,18 @@ export class MovePhase extends BattlePhase {
 
       // Assume conditions affecting targets only apply to moves with a single target
       let success = this.move.getMove().applyConditions(this.pokemon, targets[0], this.move.getMove());
+      let failedText = null;
       if (success && this.scene.arena.isMoveWeatherCancelled(this.move.getMove()))
         success = false;
+      else if (success && this.scene.arena.isMoveTerrainCancelled(this.move.getMove())) {
+        success = false;
+        failedText = getTerrainBlockMessage(targets[0], this.scene.arena.terrain.terrainType);
+      }
       if (success)
         this.scene.unshiftPhase(this.getEffectPhase());
       else {
         this.pokemon.pushMoveHistory({ move: this.move.moveId, targets: this.targets, result: MoveResult.FAIL, virtual: this.move.virtual });
-        this.showFailedText();
+        this.showFailedText(failedText);
       }
       
       this.end();
@@ -2109,8 +2114,8 @@ export class MovePhase extends BattlePhase {
     this.scene.queueMessage(getPokemonMessage(this.pokemon, ` used\n${this.move.getName()}!`), 500);
   }
 
-  showFailedText(): void {
+  showFailedText(failedText: string = null): void {
-    this.scene.queueMessage('But it failed!');
+    this.scene.queueMessage(failedText || 'But it failed!');
   }
 
   end() {