process.env.DATABASE_PATH = ':memory:';
process.env.FRONTEND_DIST = './frontend/dist';
process.env.NODE_ENV = 'test';
// Intentionally do NOT set process.env.THEMES_DIR — this spec exercises the
// default path-resolution behaviour so the test fails if the default ever
// regresses to a CWD-relative path.

import { AdminGeneralService } from '../../backend/src/modules/admin/general.service';
import { THEME_IDS } from '../../backend/src/common/types/theme-ids';

function makeFakeThemeLoader() {
  return THEME_IDS.map((id) => ({
    id,
    name: id.charAt(0).toUpperCase() + id.slice(1),
    tokens: {} as any,
  }));
}

describe('AdminGeneralService.listThemes - default THEMES_DIR resolution (Job 894)', () => {
  const fakeSettings = { get: jest.fn(), set: jest.fn() } as any;
  const fakeHub = { emitEvent: jest.fn() } as any;
  const fakeThemes = { listThemes: () => makeFakeThemeLoader() } as any;
  // Mimic the production Nest ConfigService: .get('THEMES_DIR', './themes')
  // returns the literal default string when no env override is present.
  const fakeConfig = {
    get: jest.fn().mockImplementation((key: string, fallback?: any) => fallback),
  } as any;

  it('returns all 10 canonical themes when THEMES_DIR is left at its default', () => {
    const svc = new AdminGeneralService(fakeSettings, fakeThemes, fakeHub, fakeConfig);
    const themes = svc.listThemes();
    expect(themes.length).toBe(10);
    const ids = themes.map((t) => t.id).sort();
    expect(ids).toEqual([...THEME_IDS].sort());
  });

  it('maps every entry to { id, key, name } with id === key and a non-empty name', () => {
    const svc = new AdminGeneralService(fakeSettings, fakeThemes, fakeHub, fakeConfig);
    const themes = svc.listThemes();
    for (const t of themes) {
      expect(t.id).toBe(t.key);
      expect(typeof t.name).toBe('string');
      expect(t.name.length).toBeGreaterThan(0);
    }
  });

  it('produces the same 10-entry list on repeated calls (no I/O ordering surprises)', () => {
    const svc = new AdminGeneralService(fakeSettings, fakeThemes, fakeHub, fakeConfig);
    const a = svc.listThemes().map((t) => t.id).sort();
    const b = svc.listThemes().map((t) => t.id).sort();
    expect(b).toEqual(a);
    expect(a.length).toBe(10);
  });
});