// @vitest-environment jsdom

/**
 * 「注销竞态」回归用例（tauri-apps/tauri#15799）：
 * 运行模块切换版本时会重渲染并成对触发 AGC 的事件订阅/注销，`React.StrictMode`
 * 更是挂载即注销。tauri 2.11 的库内注销脚本会先读监听注册表条目，而条目由注册
 * eval 异步写入，于是「订阅后立刻注销」会抛
 * `undefined is not an object (evaluating 'listeners[eventId].handlerId')`，
 * 且抛在 invoke 之前 → 后端订阅泄漏。这里用与 tauri 2.11 等价的替身锁死行为。
 */

import { afterEach, describe, expect, it, vi } from 'vitest';

import {
  canSubscribeTauriEvents,
  subscribeTauriEvent,
} from '../src/services/tauriEventSubscription';
import { createTauriEventFake, type TauriEventFake } from './tauriEventFake';

let fake: TauriEventFake | null = null;

afterEach(() => {
  fake?.restore();
  fake = null;
  vi.restoreAllMocks();
});

describe('subscribeTauriEvent', () => {
  it('注册 eval 还没落地就注销：不抛错、不读注册表条目、不漏后端订阅', async () => {
    fake = createTauriEventFake();
    fake.install();

    const handler = vi.fn();
    const unsubscribe = await subscribeTauriEvent(
      'game-creator-agent-progress',
      handler,
    );
    expect(fake.pendingRegistrationEvals()).toBe(1);

    // 注册 eval 还没落地（tauri 2.11 的竞态窗口）：注销必须安全。
    unsubscribe();

    expect(fake.racyUnregisterViolations).toEqual([]);
    expect(fake.racyUnregisterCalls).toBe(0);
    expect(fake.listeners).toEqual([]);
    expect(fake.jsCallbackCount()).toBe(0);
    expect(fake.unlistenInvokeCounts.get('game-creator-agent-progress')).toBe(
      1,
    );
  });

  it('同一事件已有注册条目落地时，注销还没落地的订阅也不该抛', async () => {
    fake = createTauriEventFake();
    fake.install();

    // 先让第一个订阅的注册 eval 落地：该事件的监听对象因此存在。
    const firstUnsubscribe = await subscribeTauriEvent(
      'game-creator-agent-runtime-update',
      vi.fn(),
    );
    fake.flushRegistrationEvals();

    // 重订阅（StrictMode 二次挂载 / 依赖变化都会重订阅），它的注册 eval 还没落地。
    // 这就是报错现场：事件对象存在、新 eventId 的条目不存在。
    const secondUnsubscribe = await subscribeTauriEvent(
      'game-creator-agent-runtime-update',
      vi.fn(),
    );
    secondUnsubscribe();

    expect(fake.racyUnregisterViolations).toEqual([]);
    expect(
      fake.unlistenInvokeCounts.get('game-creator-agent-runtime-update'),
    ).toBe(1);
    expect(fake.listeners).toHaveLength(1);
    expect(fake.jsCallbackCount()).toBe(1);

    firstUnsubscribe();
    expect(fake.listeners).toEqual([]);
    expect(fake.jsCallbackCount()).toBe(0);
  });

  it('重复注销只摘一次后端订阅', async () => {
    fake = createTauriEventFake();
    fake.install();

    const unsubscribe = await subscribeTauriEvent(
      'game-creator-manifest-invalidated',
      vi.fn(),
    );
    unsubscribe();
    unsubscribe();
    unsubscribe();

    expect(
      fake.unlistenInvokeCounts.get('game-creator-manifest-invalidated'),
    ).toBe(1);
    expect(fake.racyUnregisterViolations).toEqual([]);
  });

  it('注册 eval 落地后事件能投递，注销后不再投递', async () => {
    fake = createTauriEventFake();
    fake.install();

    const handler = vi.fn();
    const unsubscribe = await subscribeTauriEvent<{ message: string }>(
      'game-creator-agent-progress',
      handler,
    );
    fake.flushRegistrationEvals();

    fake.emit('game-creator-agent-progress', { message: '正在生成' });
    expect(handler).toHaveBeenCalledTimes(1);
    expect(handler.mock.calls[0][0]).toMatchObject({
      event: 'game-creator-agent-progress',
      payload: { message: '正在生成' },
    });

    unsubscribe();
    fake.emit('game-creator-agent-progress', { message: '不该再收到' });
    expect(handler).toHaveBeenCalledTimes(1);
  });

  it('真实 WebView 内不经过会读注册表的库内注销脚本', async () => {
    fake = createTauriEventFake();
    fake.install();

    const unsubscribe = await subscribeTauriEvent(
      'planning-session-v2-stream',
      vi.fn(),
    );
    unsubscribe();

    // 库内 listen 一次都没用到：AGC 自己走 event 插件 invoke。
    expect(fake.bridgeListenCalls).toBe(0);
    expect(fake.racyUnregisterCalls).toBe(0);
    expect(fake.racyUnregisterViolations).toEqual([]);
  });

  it('没有原生 internals 时回落到注入的事件桥接（jsdom 替身 / 浏览器预览）', async () => {
    fake = createTauriEventFake();
    fake.install();
    // 只留全局桥，模拟各套件里 `event: { listen }` 的替身环境。
    delete (window as unknown as Record<string, unknown>).__TAURI_INTERNALS__;

    expect(canSubscribeTauriEvents()).toBe(true);
    const handler = vi.fn();
    const unsubscribe = await subscribeTauriEvent(
      'game-creator-agent-progress',
      handler,
    );
    expect(fake.bridgeListenCalls).toBe(1);

    fake.emit('game-creator-agent-progress', { message: 'hi' });
    fake.flushRegistrationEvals();
    fake.emit('game-creator-agent-progress', { message: 'hi' });
    expect(handler).toHaveBeenCalledTimes(1);

    unsubscribe();
    unsubscribe();
    expect(fake.unlistenInvokeCounts.get('game-creator-agent-progress')).toBe(
      1,
    );
  });

  it('没有任何桥接时返回空操作', async () => {
    delete (window as unknown as Record<string, unknown>).__TAURI__;
    delete (window as unknown as Record<string, unknown>).__TAURI_INTERNALS__;

    expect(canSubscribeTauriEvents()).toBe(false);
    const unsubscribe = await subscribeTauriEvent(
      'error-report-updated',
      vi.fn(),
    );
    expect(typeof unsubscribe).toBe('function');
    expect(() => unsubscribe()).not.toThrow();
  });
});