/**
 * The device labeller behind the security screen.
 *
 * The cases that matter are the impostors: every Chromium browser claims to be
 * Chrome, every iOS browser claims to be Safari, and Edge claims both. A parser
 * that gets the obvious strings right and these wrong is a parser that labels
 * most of the world "Chrome".
 */
import { describe, expect, it } from 'vitest';
import { describeDevice } from '../src/lib/user-agent';

const UA = {
  chromeWindows:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36',
  edgeWindows:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0',
  safariIphone:
    'Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Mobile/15E148 Safari/604.1',
  chromeAndroid:
    'Mozilla/5.0 (Linux; Android 15; Pixel 9) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Mobile Safari/537.36',
  firefoxMac:
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:130.0) Gecko/20100101 Firefox/130.0',
};

describe('describeDevice', () => {
  it('reads the plain cases', () => {
    expect(describeDevice(UA.chromeWindows)).toBe('Chrome on Windows');
    expect(describeDevice(UA.firefoxMac)).toBe('Firefox on Mac');
  });

  it('does not call Edge "Chrome", though Edge says it is', () => {
    expect(describeDevice(UA.edgeWindows)).toBe('Edge on Windows');
  });

  it('does not call an iPhone a Mac, though it says "like Mac OS X"', () => {
    expect(describeDevice(UA.safariIphone)).toBe('Safari on iPhone');
  });

  it('prefers Android over the Linux it is built on', () => {
    expect(describeDevice(UA.chromeAndroid)).toBe('Chrome on Android');
  });

  it('returns what it knows when it only knows half', () => {
    expect(describeDevice('Mozilla/5.0 (Windows NT 10.0)')).toBe('Windows');
    expect(describeDevice('Firefox/130.0')).toBe('Firefox');
  });

  it('says nothing rather than guessing', () => {
    expect(describeDevice(null)).toBeNull();
    expect(describeDevice(undefined)).toBeNull();
    expect(describeDevice('')).toBeNull();
    expect(describeDevice('curl/8.7.1')).toBeNull();
  });
});