import { Writable } from "node:stream";
import { describe, expect, it } from "vitest";
import { createLogger } from "../src/index";

function captureLog() {
  let output = "";
  const destination = new Writable({
    write(chunk, _encoding, callback) {
      output += chunk.toString();
      callback();
    },
  });
  return { destination, read: () => JSON.parse(output.trim()) as Record<string, unknown> };
}

describe("structured application logging", () => {
  it("emits service metadata and redacts credential fields", () => {
    const capture = captureLog();
    const logger = createLogger("account-manager-test", { destination: capture.destination });

    logger.info({ token: "secret-token", apiKey: "secret-key", operation: "test" }, "Test event");

    expect(capture.read()).toMatchObject({
      service: "account-manager-test",
      token: "[Redacted]",
      apiKey: "[Redacted]",
      operation: "test",
      msg: "Test event",
    });
  });
});