import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
import { getVisitorId, getSessionId, touchActivity } from "../src/identity";

describe("identity", () => {
  beforeEach(() => {
    localStorage.clear();
    vi.useFakeTimers();
  });
  afterEach(() => {
    vi.restoreAllMocks();
    vi.useRealTimers();
  });

  it("visitor_id 持久化且格式正确", () => {
    const v = getVisitorId();
    expect(v).toBe(getVisitorId());
    expect(v).toMatch(/^[0-9a-f-]{36}$/);
  });

  it("30 分钟无活动切新会话；窗口内 touch 续期", () => {
    const s1 = getSessionId();
    vi.advanceTimersByTime(10 * 60_000);
    touchActivity();
    vi.advanceTimersByTime(10 * 60_000);
    expect(getSessionId()).toBe(s1); // 20min 内有活动 → 同会话
    vi.advanceTimersByTime(31 * 60_000); // 再过 31min 无活动
    expect(getSessionId()).not.toBe(s1);
  });

  it("localStorage 抛异常时内存降级不冒泡且功能可用", () => {
    // 探测确认：vitest happy-dom 环境下 window === globalThis，且 localStorage
    // 是 window 上的自有可配置 accessor——spy 其 getter 即可让模块内裸
    // localStorage 引用在访问时抛异常（等效隐私模式/禁存储）。
    const spy = vi.spyOn(window, "localStorage", "get").mockImplementation(() => {
      throw new DOMException("denied");
    });

    const v = getVisitorId();
    expect(v).toMatch(/^[0-9a-f-]{36}$/);
    const s = getSessionId();
    expect(s).toMatch(/^[0-9a-f-]{36}$/);
    expect(getSessionId()).toBe(s); // 纯内存降级下会话仍连续
    expect(() => touchActivity()).not.toThrow();

    // 还原后（内存态无法迁移到 localStorage 是预期）混用两套存储不抛
    spy.mockRestore();
    expect(() => getSessionId()).not.toThrow();
  });
});