import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { runInNewContext } from 'node:vm';
import { describe, expect, it } from 'vitest';
import indexHtml from '../index.html?raw';
import { initialLang } from './i18n/i18n';
import { initialTheme } from './shell/theme';

const publicFile = (name: string) => readFileSync(resolve(import.meta.dirname, '../public', name));

/** Breite, Höhe und Farbtyp aus dem IHDR-Block eines PNG (Farbtyp 2 = RGB ohne Alphakanal, 6 = RGBA). */
function pngInfo(buf: Buffer) {
  expect(buf.subarray(0, 8).toString('hex')).toBe('89504e470d0a1a0a');
  expect(buf.subarray(12, 16).toString('ascii')).toBe('IHDR');
  return { width: buf.readUInt32BE(16), height: buf.readUInt32BE(20), colorType: buf[25] };
}

describe('Name und Kopfbereich', () => {
  it('Titel und Meta-Angaben nennen AirCard-IOS', () => {
    // Statisch englisch, damit Link-Vorschauen englisch sind; der Router setzt danach den Titel in der gewählten Sprache.
    expect(indexHtml).toContain('<title>AirCard-IOS – Card designs for Apple Wallet</title>');
    expect(indexHtml).toContain(
      '<meta name="description" content="Explore community card designs for AirCard-iOS, create your own and download it as PNG." />',
    );
    expect(indexHtml).toContain('<meta name="theme-color" content="#0F1828" />');
    expect(indexHtml).toContain('<meta name="apple-mobile-web-app-title" content="AirCard-IOS" />');
  });

  it('Icon-Links: SVG, 32-px-PNG, Apple-Touch-Icon', () => {
    expect(indexHtml).toContain('<link rel="icon" href="/favicon.svg?v=2" type="image/svg+xml" />');
    expect(indexHtml).toContain('<link rel="icon" href="/favicon-32.png?v=2" sizes="32x32" type="image/png" />');
    expect(indexHtml).toContain('<link rel="apple-touch-icon" href="/apple-touch-icon.png?v=2" />');
  });

  it('Kopfzeile: dekoratives Logo (28 x 28) links vom Namen, beides im Markenlink', () => {
    expect(indexHtml).toContain(
      '<a class="brand" href="/" data-link><img src="/favicon.svg?v=2" alt="" width="28" height="28" /><span>AirCard-IOS</span></a>',
    );
  });

  it('Fußzeile ist leer: ihren Text setzt mountFooter in der gewählten Sprache', () => {
    expect(indexHtml).toContain('<footer id="app-footer"></footer>');
    expect(indexHtml).not.toContain('Inoffizielles Hobbyprojekt');
  });
});

describe('Icon-Dateien', () => {
  it('favicon-32.png ist 32 x 32', () => {
    expect(pngInfo(publicFile('favicon-32.png'))).toMatchObject({ width: 32, height: 32 });
  });

  it('apple-touch-icon.png ist 180 x 180 und deckend (RGB ohne Alphakanal, kein transparenter Rand)', () => {
    expect(pngInfo(publicFile('apple-touch-icon.png'))).toEqual({ width: 180, height: 180, colorType: 2 });
  });
});

describe('Inline-Skript für Hell/Dunkel und Sprache in index.html', () => {
  const script = /<script>([\s\S]*?)<\/script>/.exec(indexHtml)?.[1] ?? '';

  /** Was der Browser zur Sprache hergibt: der gespeicherte Wert von `aircard.lang`, `navigator.languages` und `navigator.language`. */
  interface BrowserLang {
    stored?: string | null;
    languages?: readonly string[];
    language?: string;
  }

  /**
   * Führt das Skript in einer leeren Umgebung aus (kein Browser) und liefert, was es gesetzt hat.
   * `stored` ist der Wert von `aircard.theme`; die Sprache steht in `browser`.
   */
  function run(stored: string | null, prefersDark: boolean, storageThrows = false, browser: BrowserLang = {}) {
    const attributes: Record<string, string> = {};
    const sandbox: Record<string, unknown> = {
      localStorage: {
        getItem: (key: string) => {
          if (storageThrows) throw new Error('gesperrt');
          return key === 'aircard.lang' ? (browser.stored ?? null) : stored;
        },
      },
      window: {
        matchMedia: () => ({ matches: prefersDark }),
        navigator: { languages: browser.languages, language: browser.language },
      },
      document: { documentElement: { setAttribute: (name: string, value: string) => (attributes[name] = value) } },
    };
    runInNewContext(script, sandbox);
    return { attributes, sandbox };
  }

  it('ist da und läuft ohne Browser-Umgebung durch', () => {
    expect(script).toContain('data-theme');
    expect(() => run(null, true)).not.toThrow();
  });

  it('legt keine globale Variable an (Skript steckt in einer sofort aufgerufenen Funktion)', () => {
    const { sandbox } = run('dark', false);
    expect(Object.keys(sandbox).sort()).toEqual(['document', 'localStorage', 'window']);
    expect('theme' in sandbox).toBe(false);
    expect('lang' in sandbox).toBe(false);
  });

  it.each([
    ['dark', false],
    ['light', true],
    ['dark', true],
    ['light', false],
    ['blau', true],
    ['blau', false],
    ['', true],
    [null, true],
    [null, false],
  ] as const)('gleiche Regel wie initialTheme(): gespeichert %j, Systemvorgabe dunkel %s', (stored, prefersDark) => {
    expect(run(stored, prefersDark).attributes['data-theme']).toBe(initialTheme(stored, prefersDark));
  });

  it('gesperrter localStorage: es gilt die Systemvorgabe', () => {
    expect(run(null, true, true).attributes['data-theme']).toBe('dark');
    expect(run(null, false, true).attributes['data-theme']).toBe('light');
  });

  it.each([
    [null, ['de-DE', 'en']],
    [null, ['en-US', 'de']],
    ['en', ['de-DE']],
    ['de', ['en-US']],
    ['xx', ['de-AT']],
    ['xx', ['fr-FR']],
    ['', ['de']],
    [null, ['DE']],
    [null, ['de_CH']],
    [null, []],
  ] as const)('setzt <html lang> nach derselben Regel wie initialLang(): gespeichert %j, Browsersprachen %j', (stored, languages) => {
    const { attributes } = run(null, true, false, { stored, languages });
    expect(attributes.lang).toBe(initialLang(stored, languages));
  });

  it('ohne navigator.languages gilt navigator.language (wie currentLang), ohne beides Englisch', () => {
    expect(run(null, true, false, { language: 'de-CH' }).attributes.lang).toBe('de');
    expect(run(null, true, false, { language: 'en-GB' }).attributes.lang).toBe('en');
    expect(run(null, true, false, { languages: [], language: 'de' }).attributes.lang).toBe('de');
    expect(run(null, true, false, {}).attributes.lang).toBe('en');
  });

  it('gesperrter localStorage: es gilt die Browsersprache', () => {
    expect(run(null, true, true, { stored: 'en', languages: ['de-DE'] }).attributes.lang).toBe('de');
    expect(run(null, true, true, { stored: 'de', languages: ['en-US'] }).attributes.lang).toBe('en');
  });

  it('die gespeicherte Sprache hat mit dem Theme nichts zu tun (und umgekehrt)', () => {
    const { attributes } = run('light', false, false, { stored: 'en', languages: ['de'] });
    expect(attributes['data-theme']).toBe('light');
    expect(attributes.lang).toBe('en');
  });
});