import { mkdtempSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { afterEach, describe, expect, it, vi } from "vitest";
import * as machineId from "../src/machineId.js";

function tempInstallIdPath(): string {
  const dir = mkdtempSync(join(tmpdir(), "origin-client-test-"));
  return join(dir, "install-id");
}

describe("resolveMachineId", () => {
  afterEach(() => {
    machineId.machineIdDetector.current = machineId.detectOsMachineId;
  });

  it("prefers an explicit override", () => {
    machineId.machineIdDetector.current = () => "os-machine-id";
    expect(machineId.resolveMachineId("explicit-id", tempInstallIdPath())).toBe("explicit-id");
  });

  it("uses the OS machine id when available", () => {
    machineId.machineIdDetector.current = () => "os-machine-id";
    expect(machineId.resolveMachineId(undefined, tempInstallIdPath())).toBe("os-machine-id");
  });

  it("falls back to a generated id and persists it across calls", () => {
    machineId.machineIdDetector.current = () => undefined;
    const path = tempInstallIdPath();

    const first = machineId.resolveMachineId(undefined, path);
    expect(first.length).toBeGreaterThan(0);

    const second = machineId.resolveMachineId(undefined, path);
    expect(second).toBe(first);
  });

  it("logs a warning when the OS id is unavailable", () => {
    machineId.machineIdDetector.current = () => undefined;
    const warn = vi.fn();
    machineId.resolveMachineId(undefined, tempInstallIdPath(), { warn });
    expect(warn).toHaveBeenCalled();
  });
});