import type { PlanStateStore } from '../../src/scenario/engine/IndexedDbPlanStore.js';

/**
 * In-memory PlanStateStore that survives across RudderClient instances — lets a
 * test simulate a page reload: drive scenario A on one client, construct a fresh
 * client sharing the same `backing`, call `scenarios.restore()`, and assert the
 * run resumed mid-DAG.
 */
export function createMemoryPlanStore(backing: { value: string | null } = { value: null }): PlanStateStore {
  return {
    get state() {
      return backing.value;
    },
    set state(v: string | null) {
      backing.value = v;
    },
    async load() {
      /* state already in `backing` */
    },
    async save(s: string | null) {
      backing.value = s;
    },
  };
}

/** Deterministic, collision-free crypto.randomUUID() stub for scenario run IDs. */
export function stubDeterministicUuid(): void {
  let n = 0;
  const existing = (globalThis as { crypto?: Crypto }).crypto ?? ({} as Crypto);
  Object.defineProperty(globalThis, 'crypto', {
    configurable: true,
    value: {
      ...existing,
      randomUUID: () => {
        n += 1;
        const hex = n.toString(16).padStart(12, '0');
        return `00000000-0000-4000-a000-${hex}` as `${string}-${string}-${string}-${string}-${string}`;
      },
    },
  });
}