1 files changed, 178 insertions, 2 deletions
diff --git a/src/engine/entities/FunctionApplication.ts b/src/engine/entities/FunctionApplication.ts
index 31e3490..24e4eec 100644
--- a/src/engine/entities/FunctionApplication.ts
+++ b/src/engine/entities/FunctionApplication.ts
@@ -1,7 +1,183 @@
-import { Entity, EntityNames } from ".";
+import {
+  Entity,
+  EntityNames,
+  FunctionBox,
+  Key,
+  Particles,
+  makeLambdaTermHighlightComponent,
+} from ".";
+import {
+  BoundingBox,
+  Colliding,
+  ComponentNames,
+  Grid,
+  LambdaTerm,
+  Sprite,
+} from "../components";
+import {
+  Failure,
+  IMAGES,
+  LambdaTransformSound,
+  SOUNDS,
+  SPRITE_SPECS,
+  SpriteSpec,
+  Sprites,
+} from "../config";
+import { Coord2D, Direction } from "../interfaces";
+import { Game } from "..";
+import { Grid as GridSystem, SystemNames } from "../systems";
+import { colors } from "../utils";
+import {
+  DebrujinifiedLambdaTerm,
+  SymbolTable,
+  emitNamed,
+  interpret,
+} from "../../interpreter";
 
 export class FunctionApplication extends Entity {
-  constructor() {
+  private static spriteSpec = SPRITE_SPECS.get(Sprites.BUBBLE) as SpriteSpec;
+
+  private symbolTable: SymbolTable;
+
+  constructor(gridPosition: Coord2D, lambdaTerm: string) {
     super(EntityNames.FunctionApplication);
+
+    this.symbolTable = new SymbolTable();
+    this.symbolTable.add("key");
+
+    const dimension = {
+      width: FunctionApplication.spriteSpec.width,
+      height: FunctionApplication.spriteSpec.height,
+    };
+    this.addComponent(
+      new BoundingBox(
+        {
+          x: 0,
+          y: 0,
+        },
+        dimension,
+        0,
+      ),
+    );
+
+    this.addComponent(new Grid(gridPosition));
+
+    this.addComponent(new LambdaTerm(lambdaTerm));
+
+    this.addComponent(
+      new Sprite(
+        IMAGES.get(FunctionApplication.spriteSpec.sheet)!,
+        { x: 0, y: 0 },
+        dimension,
+        FunctionApplication.spriteSpec.msPerFrame,
+        FunctionApplication.spriteSpec.frames,
+      ),
+    );
+
+    this.addComponent(new Colliding(this.handleCollision.bind(this)));
+
+    this.addComponent(makeLambdaTermHighlightComponent(this));
+  }
+
+  public handleCollision(game: Game, entity: Entity) {
+    if (entity.name !== EntityNames.FunctionBox) {
+      return;
+    }
+
+    const entityGrid = entity.getComponent<Grid>(ComponentNames.Grid);
+    if (entityGrid.movingDirection !== Direction.NONE) {
+      // prevent recursive functionBox -> application creation
+      return;
+    }
+
+    const grid = this.getComponent<Grid>(ComponentNames.Grid);
+    const gridSystem = game.getSystem<GridSystem>(SystemNames.Grid);
+    const fail = () => {
+      entityGrid.movingDirection = gridSystem.oppositeDirection(
+        entityGrid.previousDirection,
+      );
+      entity.addComponent(entityGrid);
+
+      const failureSound = SOUNDS.get(Failure.name)!;
+      failureSound.play();
+    };
+
+    const applicationTerm = this.getComponent<LambdaTerm>(
+      ComponentNames.LambdaTerm,
+    );
+    const functionTerm = entity.getComponent<LambdaTerm>(
+      ComponentNames.LambdaTerm,
+    );
+    const newCode = applicationTerm.code.replace("_INPUT", functionTerm.code);
+    let result: DebrujinifiedLambdaTerm | null = null;
+    try {
+      result = interpret(newCode, this.symbolTable);
+    } catch (e) {
+      console.error(e);
+      fail();
+      return;
+    }
+
+    const { dimension } = gridSystem;
+    const nextPosition = gridSystem.getNewGridPosition(
+      grid.gridPosition,
+      entityGrid.previousDirection,
+    );
+
+    let applicationResultingEntity: Entity | null = null; // this should be its own function
+    if ("abstraction" in result) {
+      const code = emitNamed(result);
+
+      applicationResultingEntity = new FunctionBox(grid.gridPosition, code);
+    } else if ("name" in result) {
+      const { name } = result;
+      if (name === "key") {
+        applicationResultingEntity = new Key(grid.gridPosition);
+      }
+    } else {
+      fail();
+      return;
+    }
+
+    game.removeEntity(entity.id);
+    if (applicationResultingEntity) {
+      const grid = applicationResultingEntity.getComponent<Grid>(
+        ComponentNames.Grid,
+      );
+      grid.movingDirection = entityGrid.previousDirection;
+      applicationResultingEntity.addComponent(grid);
+
+      game.addEntity(applicationResultingEntity);
+    }
+
+    this.playTransformSound();
+    const particles = new Particles({
+      center: gridSystem.gridToScreenPosition(nextPosition),
+      spawnerDimensions: {
+        width: dimension.width / 2,
+        height: dimension.height / 2,
+      },
+      particleCount: 10,
+      spawnerShape: "circle",
+      particleShape: "circle",
+      particleMeanSpeed: 0.25,
+      particleSpeedVariance: 0.15,
+      particleMeanLife: 150,
+      particleMeanSize: 2,
+      particleSizeVariance: 1,
+      particleLifeVariance: 20,
+      particleColors: [
+        colors.lightAqua,
+        colors.blue,
+        colors.green,
+        colors.lightGreen,
+      ],
+    });
+    game.addEntity(particles);
+  }
+
+  private playTransformSound() {
+    const audio = SOUNDS.get(LambdaTransformSound.name)!;
+    audio.play();
   }
 }