Add inventory

js/game/inventory.mjs

@@ -0,0 +1,62 @@
+import {modules} from '../data.mjs';
+import {images as assets} from '../assets.mjs';
+
+export const items = new Map();
+export let currentItem = null;
+
+export function init() {
+	items.clear();
+	addItem('capsule', 'small');
+	addItem('thruster', 'light');
+}
+
+export function getTiles() {
+	let list = Array.from(items.values());
+	list.sort((a, b) => toId(...a.ident) < toId(...b.ident));
+	return list;
+}
+
+export function addItem(type, id) {
+	let mapId = toId(type, id);
+	if (!items.has(mapId)) items.set(mapId, new Tile(type, id));
+	let tile = items.get(mapId);
+	tile.increase();
+}
+
+export function removeItem(type, id) {
+	let mapId = toId(type, id);
+	if (!items.has(mapId)) return;
+	let tile = items.get(mapId);
+	tile.decrease();
+}
+
+export function selectItem(type, id) {
+	currentItem = items.get(toId(type, id));
+}
+
+function toId(type, id) {
+	return `${type}.${id}`;
+}
+
+class Tile {
+	constructor(type, id, q = 0) {
+		this.type = type;
+		this.id = id;
+		this.mapId = toId(type, id);
+		this.quantity = q;
+		this.image = assets.modules[type][id];
+		if (type === 'thruster') this.image = this.image.off;
+	}
+
+	get ident() {
+		return [this.type, this.id];
+	}
+
+	increase() {
+		this.quantity++;
+	}
+
+	decrease() {
+		this.quantity = Math.max(0, this.quantity - 1);
+	}
+}