import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { renderHook, act, waitFor } from "@testing-library/react";

// 顶层 mock（Vitest 会提升这些），使用 doMock 以兼容 resetModules
vi.mock("../api/modules/workspace", () => ({
  workspaceApi: { getWatchUrl: vi.fn().mockReturnValue("http://test/watch") },
}));
vi.mock("../api/authHeaders", () => ({
  buildAuthHeaders: vi.fn().mockReturnValue({}),
}));

// 创建一个永远挂起的 fetch（用于不关心 SSE 内容的测试）
function makePendingFetchMock() {
  return vi.fn().mockReturnValue(new Promise(() => {}));
}

describe("useWorkspaceWatch — connection lifecycle", () => {
  let useWorkspaceWatch: typeof import("./useWorkspaceWatch").useWorkspaceWatch;

  beforeEach(async () => {
    vi.clearAllMocks();
    vi.resetModules();

    vi.doMock("../api/modules/workspace", () => ({
      workspaceApi: {
        getWatchUrl: vi.fn().mockReturnValue("http://test/watch"),
      },
    }));
    vi.doMock("../api/authHeaders", () => ({
      buildAuthHeaders: vi.fn().mockReturnValue({}),
    }));

    ({ useWorkspaceWatch } = await import("./useWorkspaceWatch"));
  });

  afterEach(() => {
    // 恢复原始 fetch（防止 mock 泄漏）
    vi.restoreAllMocks();
  });

  // ─── 测试 1：disabled 时不调用 fetch ───────────────────────────────────────
  it("disabled 时不调用 fetch", async () => {
    const mockFetch = makePendingFetchMock();
    vi.stubGlobal("fetch", mockFetch);

    const { unmount } = renderHook(() => useWorkspaceWatch(vi.fn(), false));

    // 等一个 tick，确保 effect 已执行
    await act(async () => {});

    expect(mockFetch).not.toHaveBeenCalled();
    unmount();
  });

  // ─── 测试 2：enabled 时会调用 fetch ───────────────────────────────────────
  it("enabled 时挂载后会调用 fetch", async () => {
    const mockFetch = makePendingFetchMock();
    vi.stubGlobal("fetch", mockFetch);

    const { unmount } = renderHook(() => useWorkspaceWatch(vi.fn(), true));

    await waitFor(() => {
      expect(mockFetch).toHaveBeenCalledWith(
        "http://test/watch",
        expect.objectContaining({ method: "GET" }),
      );
    });

    unmount();
  });

  // ─── 测试 7：最后一个 listener unmount 后断开连接（abort 被调用）──────────
  it("最后一个 listener unmount 后 AbortController.abort 被调用", async () => {
    const mockFetch = makePendingFetchMock();
    vi.stubGlobal("fetch", mockFetch);

    const abortSpy = vi.spyOn(AbortController.prototype, "abort");

    const { unmount } = renderHook(() => useWorkspaceWatch(vi.fn(), true));

    await waitFor(() => expect(mockFetch).toHaveBeenCalled());

    act(() => {
      unmount();
    });

    expect(abortSpy).toHaveBeenCalled();
  });

  // ─── 测试 8：enabled 从 false 变为 true 时启动连接 ────────────────────────
  it("enabled 从 false 变为 true 时启动连接", async () => {
    const mockFetch = makePendingFetchMock();
    vi.stubGlobal("fetch", mockFetch);

    const { rerender, unmount } = renderHook(
      ({ enabled }: { enabled: boolean }) =>
        useWorkspaceWatch(vi.fn(), enabled),
      { initialProps: { enabled: false } },
    );

    await act(async () => {});
    expect(mockFetch).not.toHaveBeenCalled();

    rerender({ enabled: true });

    await waitFor(() => {
      expect(mockFetch).toHaveBeenCalledWith(
        "http://test/watch",
        expect.objectContaining({ method: "GET" }),
      );
    });

    unmount();
  });
});