4 files changed, 129 insertions, 0 deletions
diff --git a/src/engine/systems/FacingDirection.ts b/src/engine/systems/FacingDirection.ts
new file mode 100644
index 0000000..f831bf6
--- /dev/null
+++ b/src/engine/systems/FacingDirection.ts
@@ -0,0 +1,63 @@
+import {
+  ComponentNames,
+  FacingDirection as FacingDirectionComponent,
+  BoundingBox,
+  Sprite,
+} from "../components";
+import { Game } from "../Game";
+import { System, SystemNames, Input } from ".";
+import { Direction, angleToDirection } from "../interfaces";
+
+export class FacingDirection extends System {
+  private input: Input;
+
+  constructor(input: Input) {
+    super(SystemNames.FacingDirection);
+
+    this.input = input;
+  }
+
+  public update(_dt: number, game: Game) {
+    const mousePosition = this.input.getMousePosition();
+    const mouseBoundingBox = new BoundingBox(mousePosition, {
+      width: 0,
+      height: 0,
+    });
+
+    game.forEachEntityWithComponent(
+      ComponentNames.FacingDirection,
+      (entity) => {
+        if (!entity.hasComponent(ComponentNames.BoundingBox)) {
+          return;
+        }
+
+        const boundingBox = entity.getComponent<BoundingBox>(
+          ComponentNames.BoundingBox,
+        )!;
+        const facingDirection = entity.getComponent<FacingDirectionComponent>(
+          ComponentNames.FacingDirection,
+        );
+
+        const { center } = boundingBox;
+        const angle = Math.atan2(
+          mousePosition.y - center.y,
+          mousePosition.x - center.x,
+        );
+
+        const mouseInBoundingBox =
+          boundingBox.isCollidingWith(mouseBoundingBox);
+        const direction = mouseInBoundingBox
+          ? Direction.NONE
+          : angleToDirection(angle);
+
+        facingDirection.setDirection(direction);
+
+        const oldSprite = entity.getComponent<Sprite>(ComponentNames.Sprite);
+        const sprite = facingDirection.directionSprites.get(direction)!;
+        sprite.fillTimingsFromSprite(oldSprite);
+
+        entity.addComponent(sprite);
+      },
+    );
+  }
+}
diff --git a/src/engine/systems/Input.ts b/src/engine/systems/Input.ts
new file mode 100644
index 0000000..9b88378
--- /dev/null
+++ b/src/engine/systems/Input.ts
@@ -0,0 +1,63 @@
+import { SystemNames, System } from ".";
+import { Game } from "..";
+import { ComponentNames } from "../components";
+import { Control } from "../components/Control";
+import { Action, KeyConstants } from "../config";
+import { Entity } from "../entities";
+import { Coord2D } from "../interfaces";
+
+export class Input extends System {
+  private keys: Set<string>;
+  private mousePosition: Coord2D;
+
+  constructor() {
+    super(SystemNames.Input);
+
+    this.keys = new Set();
+    this.mousePosition = { x: 0, y: 0 };
+  }
+
+  public clearKeys() {
+    this.keys.clear();
+  }
+
+  public keyPressed(key: string) {
+    this.keys.add(key);
+  }
+
+  public keyReleased(key: string) {
+    this.keys.delete(key);
+  }
+
+  public update(_dt: number, game: Game) {
+    game.forEachEntityWithComponent(ComponentNames.Control, (entity) =>
+      this.handleInput(entity),
+    );
+  }
+
+  public handleInput(entity: Entity) {
+    const controlComponent = entity.getComponent<Control>(
+      ComponentNames.Control,
+    );
+    if (!controlComponent.isControllable) return;
+
+    if (this.hasSomeKey(KeyConstants.ActionKeys.get(Action.INTERACT))) {
+      console.log("interact");
+    }
+  }
+
+  private hasSomeKey(keys?: string[]): boolean {
+    if (keys) {
+      return keys.some((key) => this.keys.has(key));
+    }
+    return false;
+  }
+
+  public setMousePosition(mousePosition: Coord2D) {
+    this.mousePosition = mousePosition;
+  }
+
+  public getMousePosition(): Coord2D {
+    return this.mousePosition;
+  }
+}
diff --git a/src/engine/systems/SystemNames.ts b/src/engine/systems/SystemNames.ts
index 41207a4..1ed9894 100644
--- a/src/engine/systems/SystemNames.ts
+++ b/src/engine/systems/SystemNames.ts
@@ -4,4 +4,5 @@ export namespace SystemNames {
   export const Input = "Input";
   export const Collision = "Collision";
   export const WallBounds = "WallBounds";
+  export const FacingDirection = "FacingDirection";
 }
diff --git a/src/engine/systems/index.ts b/src/engine/systems/index.ts
index bb87060..31c98ac 100644
--- a/src/engine/systems/index.ts
+++ b/src/engine/systems/index.ts
@@ -1,3 +1,5 @@
 export * from "./SystemNames";
 export * from "./System";
 export * from "./Render";
+export * from "./Input";
+export * from "./FacingDirection";