import { describe, expect, it } from "vitest";

import { parseLogLine } from "./parse-log-line.js";

describe("parseLogLine", () => {

it("parses structured JSON log lines", () => {

const line = JSON.stringify({

time: "2026-01-09T01:38:41.523Z",

0: '{"subsystem":"gateway/channels/demo-channel"}',

1: "connected",

_meta: {

name: '{"subsystem":"gateway/channels/demo-channel"}',

logLevelName: "INFO",

},

});

const parsed = parseLogLine(line);

expect(parsed?.time).toBe("2026-01-09T01:38:41.523Z");

expect(parsed?.level).toBe("info");

expect(parsed?.subsystem).toBe("gateway/channels/demo-channel");

expect(parsed?.message).toBe('{"subsystem":"gateway/channels/demo-channel"} connected');

expect(parsed?.raw).toBe(line);

});

it("falls back to meta timestamp when top-level time is missing", () => {

const line = JSON.stringify({

0: "hello",

_meta: {

name: '{"subsystem":"gateway"}',

logLevelName: "WARN",

date: "2026-01-09T02:10:00.000Z",

},

});

const parsed = parseLogLine(line);

expect(parsed?.time).toBe("2026-01-09T02:10:00.000Z");

expect(parsed?.level).toBe("warn");

});

it("returns null for invalid JSON", () => {

expect(parseLogLine("not-json")).toBeNull();

});

});