feat: First iteration, multi themes, I18N

public/js/engine/effects.js

@@ -0,0 +1,38 @@
+// Upgrade effects. To add a new effect type: register it here, add its
+// `effect.<type>` string to the core locale files, and use it in upgrades.json.
+
+export function newModifiers() {
+  return {
+    click: 1,
+    generators: {},
+    global: 1,
+    demand: 1,
+    value: 1,
+    materialEfficiency: 1,
+    batchDiscount: 1,
+    autoBuyMaterial: false,
+  };
+}
+
+const APPLY = {
+  click_mult: (m, e) => void (m.click *= e.value),
+  generator_mult: (m, e) => void (m.generators[e.target] = (m.generators[e.target] ?? 1) * e.value),
+  global_mult: (m, e) => void (m.global *= e.value),
+  demand_mult: (m, e) => void (m.demand *= e.value),
+  value_mult: (m, e) => void (m.value *= e.value),
+  material_efficiency: (m, e) => void (m.materialEfficiency *= e.value),
+  batch_discount: (m, e) => void (m.batchDiscount *= e.value),
+  auto_buy_material: (m) => void (m.autoBuyMaterial = true),
+};
+
+export const EFFECT_TYPES = Object.keys(APPLY);
+
+/** Fold every owned upgrade into a single set of multipliers. */
+export function computeModifiers(ownedIds, upgradesById) {
+  const m = newModifiers();
+  for (const id of ownedIds) {
+    const effect = upgradesById.get(id)?.effect;
+    if (effect) APPLY[effect.type]?.(m, effect);
+  }
+  return m;
+}