First commit, done on M6 from the PLAN.MD

2026-10-25 17:34:44 +01:00
parent d5dc2a3901
commit 04193e2013
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+// Headless balance runner. No DOM, no fetch: works in the browser (sim.html) and in Node.
+
+import {
+  createGame, advanceDay, summarize, setBudget, confirmBudget, ensureCard, answerCard, nextFloat, dismissAlert,
+} from "../js/engine/index.js";
+
+// A strategy decides what to do at each quarterly review (review) and how to answer
+// each weekly card (answer, default: a coin flip from the game's own RNG).
+export const STRATEGIES = {
+  baseline: { label: "Baseline (change nothing)", review: () => ({}) },
+  yesMan: { label: "Yes to every card", review: () => ({}), answer: () => "yes" },
+  noMan: { label: "No to every card", review: () => ({}), answer: () => "no" },
+  spendthrift: {
+    label: "Spendthrift (all budgets x1.4)",
+    review: (state) => ({ alloc: scaled(state, 1.4) }),
+  },
+  austerity: {
+    label: "Austerity (all budgets x0.75)",
+    review: (state) => ({ alloc: scaled(state, 0.75) }),
+  },
+  policeState: {
+    label: "Police state (police x3, army x1.5)",
+    review: (state) => ({ alloc: { police: state.sectors.police.need * 3, army: state.sectors.army.need * 1.5 } }),
+  },
+  taxTheRich: {
+    label: "Tax hike (income +10, corporate +10)",
+    review: (state) => ({ taxes: { income: state.ref.taxes.income + 10, corporate: state.ref.taxes.corporate + 10 } }),
+  },
+  // Deliberately bad play: each should be able to end the term early.
+  ruin: {
+    label: "Ruin (all budgets x2, taxes cut to 15/12/10)",
+    review: (state) => ({ alloc: scaled(state, 2), taxes: { income: 15, corporate: 12, vat: 10 } }),
+  },
+  starve: {
+    label: "Starve (all budgets x0.25, taxes up)",
+    review: (state) => ({
+      alloc: scaled(state, 0.25),
+      taxes: { income: state.ref.taxes.income + 15, corporate: state.ref.taxes.corporate + 10, vat: state.ref.taxes.vat + 10 },
+    }),
+  },
+  tyrant: {
+    label: "Tyrant (police x3, army x2, justice and social x0.3)",
+    review: (state) => ({
+      alloc: {
+        ...scaled(state, 0.7),
+        police: state.sectors.police.need * 3,
+        army: state.sectors.army.need * 2,
+        justice: state.sectors.justice.need * 0.3,
+        social: state.sectors.social.need * 0.3,
+      },
+    }),
+  },
+  neglectArmy: {
+    label: "Neglect the army (army x0.1, the rest x1.1)",
+    review: (state) => ({ alloc: { ...scaled(state, 1.1), army: state.sectors.army.need * 0.1 } }),
+  },
+};
+
+function scaled(state, k) {
+  const out = {};
+  for (const [id, s] of Object.entries(state.sectors)) out[id] = s.need * (state.ref.ratio[id] * k);
+  return out;
+}
+
+// Runs one game to the end of `years` (or the end of the term) and samples every `sampleEvery` days.
+export function runSim({ scenario, balance, cards = [], strategy, years = 1, seed = 1, sampleEvery = 30 }) {
+  const state = createGame({ scenario, balance, seed, pronouns: "they" });
+  const maxDay = Math.min(balance.time.termDays, Math.round(years * 365));
+  const rows = [];
+  const strat = STRATEGIES[strategy];
+
+  const sample = () => rows.push(summarize(state, balance));
+  sample();
+
+  while (!state.over && state.day < maxDay) {
+    if (state.pending.review) {
+      const res = setBudget(state, balance, strat.review(state));
+      if (!res.ok) throw new Error(`strategy ${strategy} produced an invalid budget: ${res.errors.join(", ")}`);
+      confirmBudget(state);
+    }
+    while (state.pending.alert) dismissAlert(state);
+    if (state.pending.weeklyCard) {
+      const card = ensureCard(state, balance, cards);
+      if (card) {
+        const choice = strat.answer ? strat.answer(state, card) : nextFloat(state) < 0.5 ? "yes" : "no";
+        answerCard(state, balance, cards, choice);
+      }
+    }
+    advanceDay(state, balance);
+    if (state.day % sampleEvery === 0) sample();
+  }
+  sample();
+  return { rows, final: rows[rows.length - 1], over: state.over };
+}