import { test, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import { isMacOS, mobileOrTablet } from './user-agent';

// `ua()` reads `window.navigator.userAgent` lazily on every call, so we can swap
// the global mock per test case and restore it afterwards.
const UA = {
  mac: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36',
  windows:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36',
  linux:
    'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36',
  iphone:
    'Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1',
  ipad: 'Mozilla/5.0 (iPad; CPU OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1',
  android:
    'Mozilla/5.0 (Linux; Android 13; Pixel 7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Mobile Safari/537.36',
};

const g = globalThis as unknown as { window?: unknown };
const originalWindow = g.window;

const setUserAgent = (userAgent: string) => {
  g.window = { navigator: { userAgent } };
};

afterEach(() => {
  g.window = originalWindow;
});

test('isMacOS returns true for a Mac user agent (handles both macOS and legacy Mac OS)', () => {
  setUserAgent(UA.mac);
  assert.equal(isMacOS(), true);
});

test('isMacOS returns false for non-Mac user agents', () => {
  setUserAgent(UA.windows);
  assert.equal(isMacOS(), false);
  setUserAgent(UA.linux);
  assert.equal(isMacOS(), false);
  setUserAgent(UA.android);
  assert.equal(isMacOS(), false);
});

test('mobileOrTablet is true for an iPhone', () => {
  setUserAgent(UA.iphone);
  assert.equal(mobileOrTablet(), true);
});

test('mobileOrTablet is true for an iPad', () => {
  setUserAgent(UA.ipad);
  assert.equal(mobileOrTablet(), true);
});

test('mobileOrTablet is true for an Android device', () => {
  setUserAgent(UA.android);
  assert.equal(mobileOrTablet(), true);
});

test('mobileOrTablet is false for desktop user agents', () => {
  setUserAgent(UA.mac);
  assert.equal(mobileOrTablet(), false);
  setUserAgent(UA.windows);
  assert.equal(mobileOrTablet(), false);
  setUserAgent(UA.linux);
  assert.equal(mobileOrTablet(), false);
});