// 运行：node sse-demo.ts —— 验证解析器能处理被切开的分块、多行 data、心跳注释
import { createSSEParser, parseFinal, type SSEEvent } from "./sse.ts";

const events: SSEEvent[] = [];
const feed = createSSEParser((e) => events.push(e));

const stream = [
  ": ping\n\n",
  "id: 1\nevent: progress\ndata: {\"step\":\"检索资料\"}\n\n",
  "id: 2\nevent: token\ndata: 签收 7 天内",
  "可以无理由退货\n\nid: 3\nevent: tok",
  "en\ndata: 。\n\n",
  "id: 4\nevent: final\ndata: {\"answer\":\"签收 7 天内可以无理由退货。\",\n",
  "data: \"citations\":[{\"id\":1,\"title\":\"退货政策\"}]}\n\n",
];
for (const chunk of stream) feed(chunk);

console.log(events.map((e) => `${e.id}:${e.event}`).join(" "));
const text = events.filter((e) => e.event === "token").map((e) => e.data).join("");
const last = events.at(-1);
const final = last ? parseFinal(last.data) : null;
console.log("拼接文本：", text, "引用：", final?.citations);
if (text !== "签收 7 天内可以无理由退货。" || events.length !== 4 || final?.citations[0]?.title !== "退货政策") {
  throw new Error("断言失败");
}