/**
 * 广播的跨进程桥 —— **别的后端动了同一张单,这边的浏览器也得知道**。
 *
 * 2026-08-24 用户报的第三件事:「一直卡在 AI 推进中,刷新后才发现已经推完了」。
 * 推送本身没坏 —— 坏在 `createBroadcaster()` 是进程内的一个 Set:那会儿本机与
 * 局域网另一台各跑一个后端连同一个库,单子被那一台推着走,这一台的浏览器一个字没收到。
 *
 * 这里钉两条:①自己推的顺手 NOTIFY 出去;②**别人发的才在本地转发,自己发的不收** ——
 * 不然一条推送在两个进程之间来回弹。
 */
import { describe, expect, it } from 'vitest';
import { bridgeBroadcaster, TOUCH_CHANNEL } from '../broadcast-bridge.ts';
import { createBroadcaster } from '../broadcast.ts';

/** 假连接池:记下 NOTIFY 出去的载荷,并留一个口子把「别人的通知」塞进来 */
function fakePool() {
  const notified: Array<{ channel: string; payload: string }> = [];
  let onNotification: ((m: { channel: string; payload?: string }) => void) | undefined;
  const client = {
    on(event: string, handler: (arg: never) => void) {
      if (event === 'notification') onNotification = handler as never;
    },
    query: async () => ({ rows: [] }),
    release: () => undefined,
  };
  return {
    notified,
    /** 模拟别的进程(或自己)发来一条 */
    deliver(wire: Record<string, unknown> | string) {
      // 字符串原样送 —— 「载荷坏了」那条用例要的是真·不是 JSON 的字节
      onNotification?.({ channel: TOUCH_CHANNEL, payload: typeof wire === 'string' ? wire : JSON.stringify(wire) });
    },
    get armed() {
      return onNotification !== undefined;
    },
    pool: {
      query: async (_sql: string, params: unknown[]) => {
        notified.push({ channel: String(params[0]), payload: String(params[1]) });
        return { rows: [] };
      },
      connect: async () => client,
    },
  };
}

const settle = (): Promise<void> => new Promise((r) => setTimeout(r, 0));

describe('bridgeBroadcaster', () => {
  it('本地推一条 → 顺手 NOTIFY 到库上(带着「谁发的」)', async () => {
    const fake = fakePool();
    const bus = createBroadcaster();
    bridgeBroadcaster(fake.pool as never, bus);
    bus.publish({ kind: 'task', id: 't-1', reason: 'advanced' });
    await settle();

    expect(fake.notified).toHaveLength(1);
    expect(fake.notified[0]?.channel).toBe(TOUCH_CHANNEL);
    const wire = JSON.parse(fake.notified[0]?.payload ?? '{}') as Record<string, unknown>;
    expect(wire['id']).toBe('t-1');
    expect(typeof wire['from']).toBe('string'); // 认「谁发的」靠它
  });

  it('**别的进程发来的,在本地转发一次** —— 这正是那一台推进、这一台刷新的那条路', async () => {
    const fake = fakePool();
    const bus = createBroadcaster();
    bridgeBroadcaster(fake.pool as never, bus);
    await settle();
    expect(fake.armed).toBe(true);

    const got: string[] = [];
    bus.subscribe((t) => got.push(`${t.kind}:${t.id}:${t.reason}`));
    fake.deliver({ kind: 'task', id: 't-9', reason: 'advanced', from: '别的机器' });
    expect(got).toEqual(['task:t-9:advanced']);
  });

  it('**自己发的不再收** —— 否则一条推送在两个进程之间来回弹', async () => {
    const fake = fakePool();
    const bus = createBroadcaster();
    bridgeBroadcaster(fake.pool as never, bus);
    bus.publish({ kind: 'task', id: 't-1', reason: 'advanced' });
    await settle();
    const self = (JSON.parse(fake.notified[0]?.payload ?? '{}') as { from?: string }).from;

    const got: string[] = [];
    bus.subscribe((t) => got.push(t.id));
    fake.deliver({ kind: 'task', id: 't-1', reason: 'advanced', from: self });
    expect(got).toEqual([]);
  });

  it('载荷坏了只丢这一条,连接照旧活着', async () => {
    const fake = fakePool();
    const bus = createBroadcaster();
    bridgeBroadcaster(fake.pool as never, bus);
    await settle();
    const got: string[] = [];
    bus.subscribe((t) => got.push(t.id));

    expect(() => fake.deliver('这不是 JSON')).not.toThrow();
    // 是 JSON 但形状不对的也得丢掉 —— 频道全库公用,谁都能往里发一句话
    expect(() => fake.deliver('"光秃秃一个字符串"')).not.toThrow();
    expect(() => fake.deliver({ 没有: 'kind 与 id' })).not.toThrow();
    fake.deliver({ kind: 'task', id: 't-3', reason: 'advanced', from: '别处' });
    expect(got).toEqual(['t-3']);
  });
});