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

public/js/engine/research.js

@@ -0,0 +1,38 @@
+// Research: labs (bought with funds) produce research points slowly over time;
+// points buy nodes of a small tree. Research survives a legacy restart.
+
+export function labCost(state, ctx) {
+  const r = ctx.rules.research;
+  return Math.ceil(r.labBaseCost * r.labCostGrowth ** state.labs);
+}
+
+export function rpPerSecond(state, ctx, mods) {
+  return state.labs * ctx.rules.research.rpPerLabPerSecond * mods.rp;
+}
+
+export function buyLab(state, ctx) {
+  const { labMax } = ctx.rules.research;
+  const cost = labCost(state, ctx);
+  if (state.labs >= labMax || state.funds < cost) return false;
+  state.funds -= cost;
+  state.labs += 1;
+  return true;
+}
+
+/** 'owned' | 'available' | 'locked' */
+export function researchStatus(state, node) {
+  if (state.research.includes(node.id)) return 'owned';
+  return node.requires.every((id) => state.research.includes(id)) ? 'available' : 'locked';
+}
+
+export function buyResearch(state, ctx, id) {
+  const node = ctx.researchById.get(id);
+  if (!node || researchStatus(state, node) !== 'available' || state.rp < node.cost) return false;
+  state.rp -= node.cost;
+  state.research.push(id);
+  return true;
+}
+
+export function stepResearch(state, ctx, dt, mods) {
+  state.rp += rpPerSecond(state, ctx, mods) * dt;
+}