import assert from "node:assert/strict";
import { test } from "node:test";
import { parseSse } from "../src/lib/sse";

test("parseSse extracts event + data blocks separated by blank lines", () => {
  const { messages, rest } = parseSse('event:message\ndata:{"a":1}\n\nevent:message\ndata:hello\n\n');
  assert.equal(rest, "");
  assert.equal(messages.length, 2);
  assert.equal(messages[0].event, "message");
  assert.equal(messages[0].data, '{"a":1}');
  assert.equal(messages[1].data, "hello");
});

test("parseSse keeps a trailing partial event in rest", () => {
  const { messages, rest } = parseSse("event:message\ndata:par");
  assert.equal(messages.length, 0);
  assert.equal(rest, "event:message\ndata:par");
});

test("parseSse joins multi-line data fields with newline", () => {
  const { messages } = parseSse("data:line1\ndata:line2\n\n");
  assert.equal(messages.length, 1);
  assert.equal(messages[0].data, "line1\nline2");
});

test("parseSse normalizes CRLF-delimited events", () => {
  const { messages, rest } = parseSse("data:hello\r\n\r\n");
  assert.equal(rest, "");
  assert.equal(messages.length, 1);
  assert.equal(messages[0].data, "hello");
});