feat: New features (research, invest, gambling, new game+, trophies)

public/js/engine/modifiers.js

@@ -0,0 +1,36 @@
+// Gathers every source of bonuses for the current state and folds them.
+
+import { foldEffects } from './effects.js';
+import { chipDemandBonus } from './formulas.js';
+
+/** All `{ effect, times }` entries that apply to `state`. */
+export function collectEffects(state, ctx) {
+  const entries = [];
+
+  for (const id of state.upgrades) entries.push({ effect: ctx.upgradesById.get(id)?.effect });
+  for (const id of state.research) entries.push({ effect: ctx.researchById.get(id)?.effect });
+  for (const id of state.achievements) entries.push({ effect: ctx.achievementsById.get(id)?.effect });
+
+  for (const [id, level] of Object.entries(state.legacy.perks)) {
+    entries.push({ effect: ctx.perksById.get(id)?.effect, times: level });
+  }
+
+  // Every legacy point ever earned gives a small passive bonus.
+  const passive = 1 + ctx.rules.legacy.passivePerPoint;
+  entries.push({ effect: { type: 'global_mult', value: passive }, times: state.legacy.earned });
+  entries.push({ effect: { type: 'demand_mult', value: passive }, times: state.legacy.earned });
+
+  // Chips make the brand more attractive, with diminishing returns.
+  entries.push({
+    effect: { type: 'demand_mult', value: chipDemandBonus(state.chips, ctx.rules.gamble) },
+  });
+
+  // Temporary buffs from events and contracts.
+  for (const buff of state.events.buffs) entries.push({ effect: { type: buff.type, value: buff.value } });
+
+  return entries;
+}
+
+export function modifiersFor(state, ctx) {
+  return foldEffects(collectEffects(state, ctx));
+}