import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
import { Transport } from "../src/transport";
import { mergeConfig } from "../src/config";
import { startPageTracking } from "../src/events";

// 有效停留（spec §4.3）：可见 + 30s 内有活动才按秒累计。
// 注意：startPageTracking 在 document/window 上注册的监听跨用例存留（匿名函数无法摘除），
// 故每个用例用独立 siteId，并按 body.site_id 过滤断言，避免旧 tracker 的 close 串扰计数。
// happy-dom 的 navigator.sendBeacon 会发真实网络请求——beforeEach 里整体 stubGlobal 替换
// （Task 14 注释警示），凡 close→flush(true) 路径均不得触网。

const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/;

let fetchMock: ReturnType<typeof vi.fn>;
let beacon: ReturnType<typeof vi.fn>;

function stubNavigator() {
  beacon = vi.fn().mockReturnValue(true);
  vi.stubGlobal("navigator", {
    userAgent:
      "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
    language: "zh-CN",
    hardwareConcurrency: 8,
    sendBeacon: beacon,
  });
}

function mkTransport(siteId: string) {
  return new Transport(
    mergeConfig({ siteId, endpoint: "/api/collect/batch", batchSize: 10, flushMs: 60000 })
  );
}

/** 从 beacon 调用里取指定 site 的请求体（过滤掉旧用例 tracker 的串扰批次） */
async function beaconBodies(siteId: string) {
  const out = [];
  for (const [, blob] of beacon.mock.calls as unknown as [string, Blob][]) {
    const body = JSON.parse(await blob.text());
    if (body.site_id === siteId) out.push(body);
  }
  return out as { site_id: string; events: { event_name: string; path: string; properties: Record<string, unknown> }[] }[];
}

describe("events / startPageTracking", () => {
  beforeEach(() => {
    localStorage.clear();
    vi.useFakeTimers();
    fetchMock = vi.fn().mockResolvedValue({ ok: true, status: 200 } as Response);
    vi.stubGlobal("fetch", fetchMock);
    stubNavigator();
  });
  afterEach(() => {
    vi.unstubAllGlobals();
    vi.useRealTimers(); // 旧 tracker 的 1s interval 挂在各自 fake clock 上，随钟一起废弃
    delete (document as { hidden?: boolean }).hidden; // 还原 happy-dom 原型 getter
    delete (document as { referrer?: string }).referrer;
  });

  it("page_view 含 path/title/referrer_domain/utm（path 同源清洗）", async () => {
    document.title = "落地页";
    Object.defineProperty(document, "referrer", {
      value: "https://news.example/article/1",
      configurable: true,
    });
    window.history.pushState({}, "", "/land?utm_source=ns&utm_medium=cpc&email=a@b.c");
    const t = mkTransport("site-pv");
    startPageTracking(t);
    t.flush();

    expect(fetchMock).toHaveBeenCalledTimes(1);
    const body = JSON.parse(fetchMock.mock.calls[0][1].body);
    const pv = body.events.find((e: { event_name: string }) => e.event_name === "page_view");
    expect(pv.event_id).toMatch(UUID_RE);
    expect(pv.occurred_at).toMatch(/^\d{4}-\d{2}-\d{2}T/);
    expect(pv.path).toBe("/land?utm_source=ns&utm_medium=cpc"); // email 参数被清洗，utm 保留
    expect(pv.title).toBe("落地页");
    expect(pv.properties).toEqual({
      referrer: "https://news.example/article/1",
      referrer_domain: "news.example",
      utm: { utm_source: "ns", utm_medium: "cpc" },
    });
  });

  it("有效停留：可见 + pointerdown 后 3s → close 发 page_stay(active_ms=3000)", async () => {
    window.history.pushState({}, "", "/p4");
    const t = mkTransport("site-t4");
    startPageTracking(t);
    document.dispatchEvent(new Event("pointerdown"));
    await vi.advanceTimersByTimeAsync(3000); // 1s interval 走 3 拍

    window.dispatchEvent(new Event("pagehide")); // 触发 close
    expect(fetchMock).not.toHaveBeenCalled(); // close 走 flush(true) → sendBeacon 而非 fetch
    const bodies = await beaconBodies("site-t4");
    expect(bodies).toHaveLength(1);
    expect(bodies[0].events.map((e) => e.event_name)).toEqual(["page_view", "page_stay"]);
    const stay = bodies[0].events[1];
    expect(stay.properties.active_ms).toBe(3000);
    expect(stay.path).toBe("/p4"); // 顶层 path 与 page_view 同源
    expect(stay.properties.path).toBe("/p4"); // properties.path 供服务端合并相邻 page_view
  });

  it("hidden 后不累计：visibilitychange→close 发 page_stay 并 flush(true)；再次 close 不重发", async () => {
    window.history.pushState({}, "", "/p5");
    const t = mkTransport("site-t5");
    startPageTracking(t);
    document.dispatchEvent(new Event("pointerdown"));
    await vi.advanceTimersByTimeAsync(2000); // 累计 2000

    Object.defineProperty(document, "hidden", { value: true, configurable: true });
    document.dispatchEvent(new Event("visibilitychange")); // close 第 1 次
    await vi.advanceTimersByTimeAsync(5000); // hidden 期间不累计（若累计则下步会多出一批）
    window.dispatchEvent(new Event("pagehide")); // close 第 2 次（双触发）

    const bodies = await beaconBodies("site-t5");
    expect(bodies).toHaveLength(1); // 第 2 次 close：activeMs=0 不发 stay，空队列 no-op
    const stay = bodies[0].events.find((e) => e.event_name === "page_stay")!;
    expect(stay.properties.active_ms).toBe(2000); // 恰为隐藏前累计值
    expect(fetchMock).not.toHaveBeenCalled();
  });

  it("30s 无活动不累计：单次活动后空闲 35s → active_ms 恰为 29000 后停止", async () => {
    window.history.pushState({}, "", "/pidle");
    const t = mkTransport("site-idle");
    startPageTracking(t);
    document.dispatchEvent(new Event("pointerdown")); // 仅此一次活动
    await vi.advanceTimersByTimeAsync(35_000);

    window.dispatchEvent(new Event("pagehide"));
    const bodies = await beaconBodies("site-idle");
    expect(bodies).toHaveLength(1);
    const stay = bodies[0].events.find((e) => e.event_name === "page_stay")!;
    // tick 于 +1s..+29s 时 Date.now()-lastAct<30000 成立（+30s 起等于 30000 不成立）
    expect(stay.properties.active_ms).toBe(29000);
  });

  it("隐藏→恢复→再隐藏：两段 stay 各自正确（第二段从 0 重新累计）", async () => {
    window.history.pushState({}, "", "/p6");
    const t = mkTransport("site-t6");
    startPageTracking(t);
    document.dispatchEvent(new Event("pointerdown"));
    await vi.advanceTimersByTimeAsync(2000); // 段 1：2000ms
    Object.defineProperty(document, "hidden", { value: true, configurable: true });
    document.dispatchEvent(new Event("visibilitychange")); // close → 第 1 批

    delete (document as { hidden?: boolean }).hidden; // 恢复可见（还原原型 getter）
    document.dispatchEvent(new Event("visibilitychange")); // 非 hidden → 不 close
    document.dispatchEvent(new Event("pointerdown")); // 新活动
    await vi.advanceTimersByTimeAsync(3000); // 段 2：3000ms
    Object.defineProperty(document, "hidden", { value: true, configurable: true });
    document.dispatchEvent(new Event("visibilitychange")); // close → 第 2 批

    const bodies = await beaconBodies("site-t6");
    expect(bodies).toHaveLength(2);
    const s1 = bodies[0].events.find((e) => e.event_name === "page_stay")!;
    const s2 = bodies[1].events.find((e) => e.event_name === "page_stay")!;
    expect(s1.properties.active_ms).toBe(2000);
    expect(s2.properties.active_ms).toBe(3000); // 从 0 重新起算，非 5000
    expect(bodies[1].events).toHaveLength(1); // 第 2 批只有 page_stay
  });
});