+import { System } from '@serpentity/serpentity';
+
+import RenderableNode from '../nodes/renderable';
+
+const internals = {
+ kNoPixiError: 'No pixi application passed to render system. Make sure you set the `application` key in the config object when initializing.'
+};
+
+/**
+ * Renders renderable objects to console
+ *
+ * @extends {external:Serpentity.System}
+ * @class RenderSystem
+ * @param {object} config a configuration object to extend.
+ */
+export default class RenderSystem extends System {
+
+ constructor(config = {}) {
+
+ super();
+
+ /**
+ * The node collection of renderable entities
+ *
+ * @property {external:Serpentity.NodeCollection} renderables
+ * @instance
+ * @memberof RenderSystem
+ */
+ this.renderables = null;
+
+ /**
+ * The pixi engine we will use to render
+ *
+ * @property {external:PixiJs.Application} renderables
+ * @instance
+ * @memberof RenderSystem
+ */
+ this._application = config.application;
+
+ if (!this._application) {
+ throw new Error(internals.kNoPixiError);
+ }
+ }
+
+ /**
+ * Initializes system when added. Requests renderable nodes and
+ * attaches to event listeners to add / remove them to pixi stage
+ *
+ * @function added
+ * @memberof RenderSystem
+ * @instance
+ * @param {external:Serpentity.Engine} engine the serpentity engine to
+ * which we are getting added
+ */
+ added(engine) {
+
+ this.renderables = engine.getNodes(RenderableNode);
+ this.renderables.on('nodeAdded', (event) => {
+
+ this._application.stage.addChild(event.node.container.container);
+ });
+ this.renderables.on('nodeRemoved', (event) => {
+
+ this._application.stage.removeChild(event.node.container.container);
+ });
+ }
+
+ /**
+ * Clears system resources when removed.
+ *
+ * @function removed
+ * @instance
+ * @memberof RenderSystem
+ */
+ removed() {
+
+ this.renderables.removeAllListeners('nodeAdded');
+ this.renderables.removeAllListeners('nodeRemoved');
+ this.renderables = null;
+ }
+
+ /**
+ * Runs on every update of the loop. Prints the location of every
+ * renderable
+ *
+ * @function update
+ * @instance
+ * @param {Number} currentFrameDuration the duration of the current
+ * frame
+ * @memberof RenderSystem
+ */
+ update(currentFrameDuration) {
+
+ for (const renderable of this.renderables) {
+ renderable.container.container.position.x = renderable.position.x;
+ renderable.container.container.position.y = renderable.position.y;
+ }
+ }
+};