src/sim/state.ts

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+import { GameDate, START_DATE } from './calendar';
+import { STARTING_CASH_CENTS } from './economy';
+import { createInventory, Inventory, ItemRef, itemKey } from './inventory';
+import { createLoyaltyState, LoyaltyState } from './loyalty';
+
+export const DAY_START_MINUTES = 8 * 60;
+export const OPEN_MINUTES = 9 * 60;
+export const CLOSE_MINUTES = 19 * 60;
+export const SHELF_SLOT_COUNT = 12;
+
+export interface DayStats {
+  revenueCents: number;
+  expensesCents: number;
+  salesCount: number;
+  lostRequests: number;
+  buyBacks: number;
+  trades: number;
+}
+
+export interface PendingOrder {
+  item: ItemRef;
+  qty: number;
+}
+
+export interface GameState {
+  saveVersion: 1;
+  date: GameDate;
+  minutes: number;
+  cash: number;
+  reputation: number; // 0-100
+  inventory: Inventory;
+  prices: Record<string, number>;
+  loyalty: LoyaltyState;
+  pendingOrders: PendingOrder[];
+  day: DayStats;
+  negativeMonthEnds: number;
+  bankrupt: boolean;
+  rngState: number;
+  nextCustomerId: number;
+  customerAccumulator: number;
+}
+
+export function emptyDayStats(): DayStats {
+  return { revenueCents: 0, expensesCents: 0, salesCount: 0, lostRequests: 0, buyBacks: 0, trades: 0 };
+}
+
+export function createNewGame(seed: number): GameState {
+  return {
+    saveVersion: 1,
+    date: { ...START_DATE },
+    minutes: DAY_START_MINUTES,
+    cash: STARTING_CASH_CENTS,
+    reputation: 20,
+    inventory: createInventory(SHELF_SLOT_COUNT),
+    prices: {},
+    loyalty: createLoyaltyState(),
+    pendingOrders: [],
+    day: emptyDayStats(),
+    negativeMonthEnds: 0,
+    bankrupt: false,
+    rngState: seed,
+    nextCustomerId: 1,
+    customerAccumulator: 0,
+  };
+}
+
+export function setPrice(state: GameState, item: ItemRef, cents: number): void {
+  if (cents <= 0) throw new Error('Price must be positive');
+  state.prices[itemKey(item)] = cents;
+}
+
+export function adjustReputation(state: GameState, delta: number): void {
+  state.reputation = Math.min(100, Math.max(0, state.reputation + delta));
+}

tests/sim/state.test.ts

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+import { describe, it, expect } from 'vitest';
+import { createNewGame, DAY_START_MINUTES, setPrice, SHELF_SLOT_COUNT } from '../../src/sim/state';
+import { START_DATE } from '../../src/sim/calendar';
+import { STARTING_CASH_CENTS } from '../../src/sim/economy';
+
+describe('state', () => {
+  it('creates a new game on 28/09/1990 at 8:00', () => {
+    const s = createNewGame(123);
+    expect(s.saveVersion).toBe(1);
+    expect(s.date).toEqual(START_DATE);
+    expect(s.minutes).toBe(DAY_START_MINUTES);
+    expect(s.cash).toBe(STARTING_CASH_CENTS);
+    expect(s.reputation).toBe(20);
+    expect(s.inventory.slots).toHaveLength(SHELF_SLOT_COUNT);
+    expect(s.rngState).toBe(123);
+    expect(s.bankrupt).toBe(false);
+  });
+
+  it('sets a positive price', () => {
+    const s = createNewGame(1);
+    setPrice(s, { gameId: 'tetris', condition: 'new' }, 2500);
+    expect(s.prices['tetris|new']).toBe(2500);
+    expect(() => setPrice(s, { gameId: 'tetris', condition: 'new' }, 0)).toThrow('Price must be positive');
+  });
+});