1 files changed, 86 insertions, 0 deletions
diff --git a/client/lib/systems/Input.ts b/client/lib/systems/Input.ts
new file mode 100644
index 0000000..92932dd
--- /dev/null
+++ b/client/lib/systems/Input.ts
@@ -0,0 +1,86 @@
+import {
+  Jump,
+  Forces,
+  Acceleration,
+  ComponentNames,
+  Velocity,
+  Mass,
+} from "../components";
+import { KeyConstants, PhysicsConstants } from "../config";
+import type { Entity } from "../entities";
+import { Action } from "../interfaces";
+import { System, SystemNames } from "./";
+
+export class Input extends System {
+  private keys: Set<string>;
+  private actionTimeStamps: Map<Action, number>;
+
+  constructor() {
+    super(SystemNames.Input);
+
+    this.keys = new Set<number>();
+    this.actionTimeStamps = new Map<Action, number>();
+  }
+
+  public keyPressed(key: string) {
+    this.keys.add(key);
+  }
+
+  public keyReleased(key: string) {
+    this.keys.delete(key);
+  }
+
+  private hasSomeKey(keys: string[]): boolean {
+    return keys.some((key) => this.keys.has(key));
+  }
+
+  public update(
+    dt: number,
+    entityMap: Map<number, Entity>,
+    componentEntities: Map<string, Set<number>>
+  ) {
+    componentEntities.get(ComponentNames.Control)?.forEach((entityId) => {
+      const entity = entityMap.get(entityId);
+      if (!entity.hasComponent(ComponentNames.Velocity)) {
+        return;
+      }
+
+      const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
+
+      if (this.hasSomeKey(KeyConstants.ActionKeys.get(Action.MOVE_RIGHT))) {
+        velocity.dCartesian.dx = PhysicsConstants.PLAYER_MOVE_VEL;
+      } else if (
+        this.hasSomeKey(KeyConstants.ActionKeys.get(Action.MOVE_LEFT))
+      ) {
+        velocity.dCartesian.dx = -PhysicsConstants.PLAYER_MOVE_VEL;
+      } else {
+        velocity.dCartesian.dx = 0;
+      }
+    });
+
+    componentEntities.get(ComponentNames.Jump)?.forEach((entityId) => {
+      const entity = entityMap.get(entityId);
+      const jump = entity.getComponent<Jump>(ComponentNames.Jump);
+      const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
+
+      if (this.hasSomeKey(KeyConstants.ActionKeys.get(Action.JUMP))) {
+        if (jump.canJump) {
+          this.actionTimeStamps.set(Action.JUMP, performance.now());
+
+          velocity.dCartesian.dy = PhysicsConstants.PLAYER_JUMP_INITIAL_VEL;
+          jump.canJump = false;
+        }
+
+        if (
+          performance.now() - this.actionTimeStamps.get(Action.JUMP) <
+          PhysicsConstants.MAX_JUMP_TIME_MS
+        ) {
+          const mass = entity.getComponent<Mass>(ComponentNames.Mass).mass;
+          entity.getComponent<Forces>(ComponentNames.Forces)?.forces.push({
+            fCartesian: { fy: mass * PhysicsConstants.PLAYER_JUMP_ACC },
+          });
+        }
+      }
+    });
+  }
+}