import { describe, expect, it } from "vitest";
import { EventBus } from "../src/http/sse.ts";
import { DEV_KEY, testApp } from "./helpers.ts";

describe("EventBus", () => {
  it("序号自增并按 after 补读,淘汰后标记 gap", () => {
    const bus = new EventBus(3);
    for (let i = 0; i < 5; i++) bus.publishSync("t", { i });
    expect(bus.latestSeq).toBe(5);
    expect(bus.sinceSync(3).events.map((e) => e.seq)).toEqual([4, 5]);
    expect(bus.sinceSync(3).gap).toBe(false);
    expect(bus.sinceSync(1).gap).toBe(true);
  });
});

describe("GET /api/v1/events", () => {
  it("需要鉴权", async () => {
    const { app } = testApp();
    expect((await app.request("/api/v1/events")).status).toBe(401);
  });

  it("补读 after 之后的事件", async () => {
    const { app, bus } = testApp();
    bus.publishSync("a", 1);
    bus.publishSync("b", 2);
    const ac = new AbortController();
    const res = await app.request("/api/v1/events?after=1", {
      headers: { Authorization: `Bearer ${DEV_KEY}` },
      signal: ac.signal,
    });
    expect(res.headers.get("content-type")).toContain("text/event-stream");
    const reader = res.body!.getReader();
    const { value } = await reader.read();
    const text = new TextDecoder().decode(value);
    expect(text).toContain("id: 2");
    expect(text).toContain("event: b");
    expect(text).not.toContain("event: a");
    ac.abort();
    await reader.cancel();
  });
});