import { beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
import { CalendarSourceUnreachableError, isNetworkUnreachableError } from '../calendar.service';
import type { ExchangeProvider as ExchangeProviderType } from './exchange.provider';

/**
 * ExchangeProvider.testConnection (quick-261005): Zeitgrenze fuer EWS und
 * getrennte Meldung „nicht erreichbar“.
 *
 * httpntlm wird per CommonJS-`require` geladen — `vi.mock` greift dort nicht.
 * Wie in `inbox/exchange-inbox.provider.spec.ts` wird deshalb Nodes
 * `require.cache` vor dem ersten Laden des Providers mit einem Stub belegt.
 */

const httpntlmPath = require.resolve('httpntlm');

const httpntlmPost = vi.fn((_opts: any, cb: (err: Error | null, res: any) => void) => {
  cb(new Error('httpntlmPost not configured for this test'), null);
});

require.cache[httpntlmPath] = {
  id: httpntlmPath,
  filename: httpntlmPath,
  loaded: true,
  exports: { post: httpntlmPost },
} as any;

let ExchangeProvider: typeof ExchangeProviderType;

beforeAll(async () => {
  ({ ExchangeProvider } = await import('./exchange.provider'));
});

beforeEach(() => {
  httpntlmPost.mockReset();
});

const SOURCE = {
  id: 'src-1',
  url: 'https://owa.example.invalid/EWS/Exchange.asmx',
  username: 'kalender',
  password: 'geheim',
  domain: 'CONTOSO',
  exchangeMode: 'ews',
};

function failWith(code: string) {
  httpntlmPost.mockImplementation((_opts, cb) => {
    const err = Object.assign(new Error(`fail ${code}`), { code });
    cb(err, null);
  });
}

describe('ExchangeProvider.testConnection (EWS)', () => {
  it('uebergibt httpntlm eine Zeitgrenze von 15 Sekunden', async () => {
    httpntlmPost.mockImplementation((_opts, cb) => cb(null, { statusCode: 200, body: '' }));

    await new ExchangeProvider().testConnection(SOURCE);

    expect(httpntlmPost).toHaveBeenCalled();
    expect(httpntlmPost.mock.calls[0][0].timeout).toBe(15_000);
  });

  it.each([
    'TIMEOUT',
    'ETIMEDOUT',
    'ECONNREFUSED',
    'ENOTFOUND',
    'EHOSTUNREACH',
  ])('Netzfehler %s -> CalendarSourceUnreachableError', async (code) => {
    failWith(code);
    await expect(new ExchangeProvider().testConnection(SOURCE)).rejects.toBeInstanceOf(
      CalendarSourceUnreachableError,
    );
  });

  it('keine Rueckmeldung von httpntlm (Verbindungsaufbau haengt) -> nach 15 s nicht erreichbar', async () => {
    vi.useFakeTimers();
    try {
      httpntlmPost.mockImplementation(() => {
        /* ruft nie zurueck — wie ein unbeantworteter Verbindungsaufbau */
      });
      const pending = new ExchangeProvider().testConnection(SOURCE);
      const assertion = expect(pending).rejects.toBeInstanceOf(CalendarSourceUnreachableError);
      await vi.advanceTimersByTimeAsync(14_999);
      await vi.advanceTimersByTimeAsync(1);
      await assertion;
    } finally {
      vi.useRealTimers();
    }
  });

  it('erreichbar, aber Anmeldung abgelehnt (401) -> false, kein Wurf', async () => {
    httpntlmPost.mockImplementation((_opts, cb) => cb(null, { statusCode: 401, body: '' }));
    await expect(new ExchangeProvider().testConnection(SOURCE)).resolves.toBe(false);
  });

  it('sonstiger Fehler ohne Netzkennung -> false', async () => {
    httpntlmPost.mockImplementation((_opts, cb) => cb(new Error('kaputt'), null));
    await expect(new ExchangeProvider().testConnection(SOURCE)).resolves.toBe(false);
  });
});

describe('isNetworkUnreachableError', () => {
  it('erkennt Kennung direkt und in cause, sonst nicht', () => {
    expect(isNetworkUnreachableError({ code: 'ETIMEDOUT' })).toBe(true);
    expect(isNetworkUnreachableError({ cause: { code: 'ECONNREFUSED' } })).toBe(true);
    expect(isNetworkUnreachableError(new Error('x'))).toBe(false);
    expect(isNetworkUnreachableError(null)).toBe(false);
  });
});