feat: add poc

src/core/Entity.js

@@ -0,0 +1,58 @@
+/**
+ * Entity class - represents a game object with a unique ID
+ * Entities are just containers for components
+ */
+export class Entity {
+  static nextId = 0;
+
+  constructor() {
+    this.id = Entity.nextId++;
+    this.components = new Map();
+    this.active = true;
+  }
+
+  /**
+     * Add a component to this entity
+     */
+  addComponent(component) {
+    this.components.set(component.type, component);
+    return this;
+  }
+
+  /**
+     * Get a component by type
+     */
+  getComponent(type) {
+    return this.components.get(type);
+  }
+
+  /**
+     * Check if entity has a component
+     */
+  hasComponent(type) {
+    return this.components.has(type);
+  }
+
+  /**
+     * Check if entity has all specified components
+     */
+  hasComponents(...types) {
+    return types.every(type => this.components.has(type));
+  }
+
+  /**
+     * Remove a component
+     */
+  removeComponent(type) {
+    this.components.delete(type);
+    return this;
+  }
+
+  /**
+     * Get all components
+     */
+  getAllComponents() {
+    return Array.from(this.components.values());
+  }
+}
+