import { beforeEach, describe, expect, it, vi } from 'vitest';
import { resolvePageRenderData, resolvePreviewRenderData } from '#web-runtime/api/render-data';
import { createEmptySiteSettings } from '#web-runtime/data/normalize';
import type { PageDocument, SiteSettings } from '#web-runtime/types';

const { resolvePage, getSettings, getPreview } = vi.hoisted(() => ({
  resolvePage: vi.fn(),
  getSettings: vi.fn(),
  getPreview: vi.fn()
}));

vi.mock('#web-runtime/api/web-runtime-api', () => ({
  getWebRuntimeAPI: () => ({ resolvePage, getSettings, getPreview })
}));

function page(overrides: Partial<PageDocument> = {}): PageDocument {
  return {
    id: '7',
    status: 'published',
    locale: 'en',
    path: 'about',
    groupKey: 'about',
    layout: 'landing',
    title: 'About us',
    seo: { title: 'About us', description: '' },
    breadcrumbs: [],
    blocks: [],
    publishedAt: null,
    updatedAt: null,
    ...overrides
  };
}

function settings(locale = 'en'): SiteSettings {
  return {
    locale,
    header: {
      menus: [],
      ctaItems: [
        {
          linkType: 'external',
          pageId: '',
          externalUrl: 'https://example.com',
          openInNewTab: false,
          label: 'CTA',
          variant: 'primary'
        }
      ]
    },
    footer: { copyright: '© Crux', menus: [] },
    legal: { privacyPath: 'privacy', termsPath: 'terms' }
  };
}

beforeEach(() => {
  resolvePage.mockReset();
  getSettings.mockReset();
  getPreview.mockReset();
});

// resolvePageRenderData is wrapped in React cache(); outside an RSC render
// react's cache has no store and calls straight through, but each test still
// uses a distinct locale/path pair so results can never leak between tests.

describe('resolvePageRenderData', () => {
  it('returns null when the backend cannot resolve the page', async () => {
    resolvePage.mockResolvedValue(null);

    expect(await resolvePageRenderData('en', 'missing')).toBeNull();
    expect(getSettings).not.toHaveBeenCalled();
  });

  it('refuses to render a page that is not published (the unpublish gate)', async () => {
    resolvePage.mockResolvedValue({
      page: page({ status: 'draft', path: 'draft-page' }),
      languageAlternatives: []
    });

    expect(await resolvePageRenderData('en', 'draft-page')).toBeNull();
    expect(getSettings).not.toHaveBeenCalled();
  });

  it('trims the locale and normalizes the path before asking the backend', async () => {
    resolvePage.mockResolvedValue(null);

    await resolvePageRenderData('  en  ', '/about/team/');

    expect(resolvePage).toHaveBeenCalledWith({ locale: 'en', path: 'about/team' });
  });

  it('uses the settings bundled into the resolution without a second request', async () => {
    const bundled = settings();
    resolvePage.mockResolvedValue({
      page: page({ path: 'bundled' }),
      settings: bundled,
      languageAlternatives: [{ locale: 'de', path: 'gebuendelt' }]
    });

    const data = await resolvePageRenderData('en', 'bundled');

    expect(data?.settings).toBe(bundled);
    expect(data?.languageAlternatives).toEqual([{ locale: 'de', path: 'gebuendelt' }]);
    expect(getSettings).not.toHaveBeenCalled();
  });

  it('fetches settings separately when the resolution has none', async () => {
    const fetched = settings();
    resolvePage.mockResolvedValue({ page: page({ path: 'fetched' }), languageAlternatives: [] });
    getSettings.mockResolvedValue(fetched);

    const data = await resolvePageRenderData('en', 'fetched');

    expect(getSettings).toHaveBeenCalledWith('en');
    expect(data?.settings).toBe(fetched);
  });

  it('falls back to empty settings when the backend has none at all', async () => {
    resolvePage.mockResolvedValue({ page: page({ path: 'bare' }), languageAlternatives: [] });
    getSettings.mockResolvedValue(null);

    const data = await resolvePageRenderData('en', 'bare');

    expect(data?.settings).toEqual(createEmptySiteSettings('en'));
  });

  it('returns the resolved page unchanged', async () => {
    const resolved = page({ path: 'unchanged' });
    resolvePage.mockResolvedValue({
      page: resolved,
      settings: settings(),
      languageAlternatives: []
    });

    const data = await resolvePageRenderData('en', 'unchanged');

    expect(data?.page).toBe(resolved);
  });
});

describe('resolvePreviewRenderData', () => {
  it('returns null for an empty token without calling the backend', async () => {
    expect(await resolvePreviewRenderData('')).toBeNull();
    expect(getPreview).not.toHaveBeenCalled();
  });

  it('returns null when the token resolves to nothing', async () => {
    getPreview.mockResolvedValue(null);

    expect(await resolvePreviewRenderData('token-1')).toBeNull();
    expect(getPreview).toHaveBeenCalledWith('token-1');
  });

  it('renders a draft: previews deliberately skip the published gate', async () => {
    getPreview.mockResolvedValue({
      page: page({ status: 'draft' }),
      settings: settings(),
      languageAlternatives: []
    });

    const data = await resolvePreviewRenderData('token-2');

    expect(data?.page.status).toBe('draft');
  });

  it('falls back to empty settings in the locale of the previewed page', async () => {
    getPreview.mockResolvedValue({
      page: page({ locale: 'de', status: 'draft' }),
      languageAlternatives: []
    });

    const data = await resolvePreviewRenderData('token-3');

    expect(data?.settings).toEqual(createEmptySiteSettings('de'));
  });
});