import {
  renderTelegramText,
  TELEGRAM_TEMPLATES,
  TelegramTemplateCode,
} from './telegram-texts';

const ORIGIN = 'https://app.example.org';

describe('TELEGRAM_TEMPLATES', () => {
  it('has the exact texts of the bot replies', () => {
    expect(TELEGRAM_TEMPLATES).toEqual({
      LINKED:
        'Verbunden mit ApiCore. Hier kommen deine Erinnerungen. /stop beendet das.',
      LINK_INVALID:
        'Der Link ist ungültig oder abgelaufen. Bitte in ApiCore neu verbinden.',
      STOPPED: 'Abgemeldet. Du bekommst keine Nachrichten mehr.',
      HELP: 'Dieser Bot schickt Erinnerungen aus ApiCore. Verbinden geht nur in ApiCore unter Profil > Benachrichtigungen. /stop beendet.',
    } satisfies Record<TelegramTemplateCode, string>);
  });
});

describe('renderTelegramText', () => {
  it('sends the message, a blank line and the app link', () => {
    const text = renderTelegramText(
      { message: 'Heute fällig: Futter bestellen', link: '/tasks' },
      true,
      ORIGIN,
    );

    expect(text).toBe(
      'Heute fällig: Futter bestellen\n\nhttps://app.example.org/tasks',
    );
  });

  it('falls back to /dashboard without a link', () => {
    const text = renderTelegramText({ message: 'm', link: null }, true, ORIGIN);

    expect(text).toBe('m\n\nhttps://app.example.org/dashboard');
  });

  it('without details only says there is a new message, plus the link', () => {
    const text = renderTelegramText(
      { message: 'Heute fällig: Schwarmzelle Völker', link: '/tasks' },
      false,
      ORIGIN,
    );

    expect(text).toBe(
      'Neue Meldung in ApiCore.\n\nhttps://app.example.org/tasks',
    );
    expect(text).not.toContain('Schwarm');
  });

  it('tolerates a trailing slash of the origin', () => {
    const text = renderTelegramText(
      { message: 'm', link: '/tasks' },
      true,
      `${ORIGIN}/`,
    );

    expect(text.endsWith('https://app.example.org/tasks')).toBe(true);
  });

  it('cuts a long message to at most 600 characters and keeps the link whole', () => {
    const text = renderTelegramText(
      { message: 'ä'.repeat(2000), link: '/tasks' },
      true,
      ORIGIN,
    );

    expect([...text].length).toBeLessThanOrEqual(600);
    expect(text.endsWith('\n\nhttps://app.example.org/tasks')).toBe(true);
    expect(text).toContain('…\n\n');
  });

  it('counts code points, not UTF-16 units', () => {
    const text = renderTelegramText(
      { message: '🐝'.repeat(1000), link: '/tasks' },
      true,
      ORIGIN,
    );

    expect([...text].length).toBeLessThanOrEqual(600);
    expect(text).not.toMatch(/[\ud800-\udbff](?![\udc00-\udfff])/);
  });

  it('removes control characters and invisible characters from the message', () => {
    const text = renderTelegramText(
      { message: 'a\u0007b‮c​d\r\ne', link: '/tasks' },
      true,
      ORIGIN,
    );

    expect(text).toBe('abcd\ne\n\nhttps://app.example.org/tasks');
  });

  it('without an origin sends the text alone, no link', () => {
    expect(
      renderTelegramText({ message: 'Hallo', link: '/tasks' }, true, null),
    ).toBe('Hallo');
    expect(
      renderTelegramText({ message: 'Hallo', link: '/tasks' }, false, null),
    ).toBe('Neue Meldung in ApiCore.');
  });
});