/**
 * UAT-3: Browser gate (hard stop) — unit tests for the pure logic in
 * src/lib/core/browserGate.js.
 *
 * CAPTURE.md §Browsers:
 *   Phone: iOS Safari, Android Chrome.
 *   PC: Chrome, Edge, Firefox.
 *   Other clients get a hard stop.
 */
import { describe, it, expect } from 'vitest';
import { detectBrowser, isAllowed, checkBrowserGate } from '$lib/core/browserGate.js';

// --- representative user agents ------------------------------------
const UAs = {
  iosSafari:
    'Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/605.1.15',
  ipadSafari:
    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15',
  iosChrome:
    'Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/124.0.6336.69 Mobile/15E148 Safari/605.1.15',
  androidChrome:
    'Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.6331.115 Mobile Safari/537.36',
  desktopChrome:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36',
  desktopEdge:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0',
  desktopFirefox:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0',
  desktopOpera:
    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 OPR/110.0.0.0',
  androidOpera:
    'Mozilla/5.0 (Linux; Android 14) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36 OPR/110.0.0.0',
  androidSamsung:
    'Mozilla/5.0 (Linux; Android 14; SM-S918B) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/24.0 Chrome/124.0.0.0 Mobile Safari/537.36',
  iosSamsung:
    'Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/124.0.0.0 Mobile/15E148 SamsungBrowser/124.0.0.0',
  androidBrave:
    'Mozilla/5.0 (Linux; Android 14; SM-A546E) AppleWebKit/537.36 (KHTML, like Gecko) Version/14.0.0.5336 Mobile Safari/537.36',
  unknown:
    'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) CustomBrowser/9.9.0 Safari/537.36',
  blank: '',
};

describe('detectBrowser', () => {
  it('identifies iOS Safari on iPhone', () => {
    const b = detectBrowser(UAs.iosSafari);
    expect(b.name).toBe('iOS Safari');
    expect(b.platform).toBe('phone');
  });

  it('identifies iPad Safari (iPadOS 13+ reports as Macintosh)', () => {
    const b = detectBrowser(UAs.ipadSafari);
    expect(b.name).toBe('Safari');
    expect(b.platform).toBe('pc');
  });

  it('identifies Android Chrome', () => {
    const b = detectBrowser(UAs.androidChrome);
    expect(b.name).toBe('Android Chrome');
    expect(b.platform).toBe('phone');
  });

  it('identifies desktop Chrome', () => {
    const b = detectBrowser(UAs.desktopChrome);
    expect(b.name).toBe('Chrome');
    expect(b.platform).toBe('pc');
  });

  it('identifies desktop Edge (not Chrome)', () => {
    const b = detectBrowser(UAs.desktopEdge);
    expect(b.name).toBe('Microsoft Edge');
    expect(b.platform).toBe('pc');
  });

  it('identifies desktop Firefox', () => {
    const b = detectBrowser(UAs.desktopFirefox);
    expect(b.name).toBe('Firefox');
    expect(b.platform).toBe('pc');
  });

  it('identifies desktop Opera as its own browser (not Chrome)', () => {
    const b = detectBrowser(UAs.desktopOpera);
    expect(b.name).toBe('Opera');
    expect(b.platform).toBe('pc');
  });

  it('identifies Android Opera (OPR beats Chrome)', () => {
    const b = detectBrowser(UAs.androidOpera);
    expect(b.name).toBe('Opera');
    expect(b.platform).toBe('phone');
  });

  it('identifies Samsung Internet (SamsungBrowser beats Chrome)', () => {
    const b = detectBrowser(UAs.androidSamsung);
    expect(b.name).toBe('Samsung Internet');
    expect(b.platform).toBe('phone');
  });

  it('identifies iOS Samsung Internet as unsupported', () => {
    const b = detectBrowser(UAs.iosSamsung);
    expect(b.name).toBe('Samsung Internet');
    expect(b.platform).toBe('phone');
  });

  it('treats an unrecognized UA as Unknown', () => {
    const b = detectBrowser(UAs.unknown);
    expect(b.name).toBe('Unknown');
    expect(b.platform).toBe('pc');
  });

  it('handles blank / undefined user agents without throwing', () => {
    expect(detectBrowser(UAs.blank).name).toBe('Unknown');
    expect(detectBrowser(undefined).name).toBe('Unknown');
  });
});

describe('isAllowed', () => {
  it('allows iOS Safari on phone', () => {
    expect(isAllowed({ name: 'iOS Safari', platform: 'phone' })).toBe(true);
  });

  it('allows Android Chrome on phone', () => {
    expect(isAllowed({ name: 'Android Chrome', platform: 'phone' })).toBe(true);
  });

  it('allows Chrome on PC', () => {
    expect(isAllowed({ name: 'Chrome', platform: 'pc' })).toBe(true);
  });

  it('allows Edge on PC', () => {
    expect(isAllowed({ name: 'Microsoft Edge', platform: 'pc' })).toBe(true);
  });

  it('allows Firefox on PC', () => {
    expect(isAllowed({ name: 'Firefox', platform: 'pc' })).toBe(true);
  });

  it('rejects Opera', () => {
    expect(isAllowed({ name: 'Opera', platform: 'pc' })).toBe(false);
  });

  it('rejects Android Opera', () => {
    expect(isAllowed({ name: 'Opera', platform: 'phone' })).toBe(false);
  });

  it('rejects Samsung Internet', () => {
    expect(isAllowed({ name: 'Samsung Internet', platform: 'phone' })).toBe(false);
  });

  it('rejects Samsung Internet on iOS', () => {
    expect(isAllowed({ name: 'Samsung Internet', platform: 'phone' })).toBe(false);
  });

  it('rejects Brave', () => {
    expect(isAllowed({ name: 'Brave', platform: 'phone' })).toBe(false);
  });

  it('rejects Unknown', () => {
    expect(isAllowed({ name: 'Unknown', platform: 'pc' })).toBe(false);
  });

  it('rejects phone browsers on PC (impossible but rejected)', () => {
    expect(isAllowed({ name: 'iOS Safari', platform: 'pc' })).toBe(false);
    expect(isAllowed({ name: 'Android Chrome', platform: 'pc' })).toBe(false);
  });
});

describe('checkBrowserGate', () => {
  it('supports exactly the five spec browsers + Safari (iPad)', () => {
    for (const ua of [
      UAs.iosSafari,
      UAs.ipadSafari,
      UAs.androidChrome,
      UAs.desktopChrome,
      UAs.desktopEdge,
      UAs.desktopFirefox,
    ]) {
      expect(checkBrowserGate(ua).supported).toBe(true);
    }
  });

  it('hard-stops Opera, Samsung Internet, unknown, blank', () => {
    for (const ua of [
      UAs.desktopOpera,
      UAs.androidOpera,
      UAs.androidSamsung,
      UAs.iosSamsung,
      UAs.androidBrave,
      UAs.unknown,
      UAs.blank,
    ]) {
      expect(checkBrowserGate(ua).supported).toBe(false);
    }
  });

  it('returns the detected browser for the UI', () => {
    const r = checkBrowserGate(UAs.desktopOpera);
    expect(r.browser.name).toBe('Opera');
    expect(r.browser.platform).toBe('pc');
  });
});