import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { errorMessage, PREVIEW_FAILED, LetterPreviewAdapter } from './letter-preview.adapter';

// Minimal Response stand-in — errorMessage only calls `.json()`. Avoids stubbing
// globalThis.fetch to reach this trust boundary (TE-002).
const fakeResponse = (body: unknown): Response =>
  ({ json: () => Promise.resolve(body) }) as unknown as Response;

describe('errorMessage (TE-002 trust boundary)', () => {
  it('surfaces the ProblemDetails detail when present', async () => {
    expect(await errorMessage(fakeResponse({ detail: 'Geen toegang.', status: 403 }))).toBe(
      'Geen toegang.',
    );
  });

  it('falls back to PREVIEW_FAILED when the body has no detail', async () => {
    expect(await errorMessage(fakeResponse({ status: 500 }))).toBe(PREVIEW_FAILED);
  });

  it('falls back to PREVIEW_FAILED when the body is not JSON', async () => {
    const res = { json: () => Promise.reject(new Error('not json')) } as unknown as Response;
    expect(await errorMessage(res)).toBe(PREVIEW_FAILED);
  });
});

// isDevMode() reads the `ngDevMode` global the Angular CLI defines away in a
// production build. There is no ambient type for it in app code, so this is
// accessed through an untyped bag rather than a `declare const`.
const globals = globalThis as Record<string, unknown>;
const originalNgDevMode = globals['ngDevMode'];
const setDevMode = (on: boolean) => {
  globals['ngDevMode'] = on;
};

describe('LetterPreviewAdapter.preview (BIO-012)', () => {
  const okResponse = () =>
    ({ ok: true, blob: () => Promise.resolve(new Blob()) }) as unknown as Response;

  afterEach(() => {
    globals['ngDevMode'] = originalNgDevMode;
    vi.unstubAllGlobals();
    history.pushState({}, '', '/');
    sessionStorage.clear();
  });

  it('sends no X-Role/X-Subject headers outside isDevMode()', async () => {
    setDevMode(false);
    history.pushState({}, '', '/?subject=111222333');
    const fetchSpy = vi.fn().mockResolvedValue(okResponse());
    vi.stubGlobal('fetch', fetchSpy);

    await new LetterPreviewAdapter().preview();

    expect(fetchSpy.mock.calls[0][1].headers).toEqual({});
  });

  it('sends X-Role (and X-Subject when known) under isDevMode()', async () => {
    setDevMode(true);
    history.pushState({}, '', '/?subject=111222333');
    const fetchSpy = vi.fn().mockResolvedValue(okResponse());
    vi.stubGlobal('fetch', fetchSpy);

    await new LetterPreviewAdapter().preview();

    const headers = fetchSpy.mock.calls[0][1].headers as Record<string, string>;
    expect(headers['X-Role']).toBeDefined();
    expect(headers['X-Subject']).toBe('111222333');
  });
});