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

public/js/engine/achievements.js

@@ -0,0 +1,35 @@
+// Achievements: permanent small bonuses for milestones. Each one reads a
+// single statistic, so adding one is a line in data/achievements.json (plus
+// its title in the core locale files).
+
+export function statValue(state, stat) {
+  switch (stat) {
+    case 'lifetimeProduced':
+      return state.lifetimeProduced;
+    case 'generatorsOwned':
+      return Object.values(state.generators).reduce((sum, n) => sum + n, 0);
+    case 'upgradesOwned':
+      return state.upgrades.length;
+    case 'researchOwned':
+      return state.research.length;
+    case 'prestiges':
+      return state.legacy.prestiges;
+    case 'chips':
+      return state.chips;
+    default:
+      return state.stats[stat] ?? 0; // investProfit, gambleWins, contractsDone, eventsClaimed...
+  }
+}
+
+/** Grant every achievement whose condition is now met. Returns the new ids. */
+export function checkAchievements(state, ctx) {
+  const granted = [];
+  for (const a of ctx.achievements) {
+    if (state.achievements.includes(a.id)) continue;
+    if (statValue(state, a.condition.stat) >= a.condition.min) {
+      state.achievements.push(a.id);
+      granted.push(a.id);
+    }
+  }
+  return granted;
+}