import * as path from 'path';
import * as fs from 'fs';
import * as os from 'os';
import { ThemeLoaderService } from '../../backend/src/common/utils/theme-loader.service';

describe('ThemeLoaderService', () => {
  const config = { get: jest.fn() } as any;
  // ThemeLoaderService now takes SettingsService for the configured-theme
  // validation step. We pass a stub that always returns 'classic' so the
  // existing tests focus on disk loading + lookup behavior.
  const settings = { get: jest.fn().mockResolvedValue('classic') } as any;

  it('falls back to default and warns on unknown theme id', () => {
    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify({ id: 'classic', name: 'Classic', tokens: { primary: '#000', secondary: '#111', accent: '#222', surface: '#fff', text: '#000', success: '#0f0', warning: '#ff0', danger: '#f00', fontFamily: 'sans', radii: { sm: '1px', md: '2px', lg: '3px' }, spacingScale: [4, 8] } }));
    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
    const svc = new ThemeLoaderService(config, settings);
    return svc.onModuleInit().then(() => {
      const t = svc.getTheme('does-not-exist');
      expect(t.id).toBe('classic');
      expect(t.tokens.primary).toBe('#000');
    });
  });

  it('loads a valid theme by id', () => {
    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
    const theme = { id: 'classic', name: 'Classic', tokens: { primary: '#000', secondary: '#111', accent: '#222', surface: '#fff', text: '#000', success: '#0f0', warning: '#ff0', danger: '#f00', fontFamily: 'sans', radii: { sm: '1px', md: '2px', lg: '3px' }, spacingScale: [4, 8] } };
    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify(theme));
    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
    const svc = new ThemeLoaderService(config, settings);
    return svc.onModuleInit().then(() => {
      const t = svc.getTheme('classic');
      expect(t.id).toBe('classic');
      expect(t.tokens.spacingScale).toEqual([4, 8]);
    });
  });

  it('skips invalid theme files', () => {
    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'themes-'));
    fs.writeFileSync(path.join(tmp, 'classic.json'), JSON.stringify({ id: 'classic', name: 'Classic', tokens: { primary: '#000' } })); // missing required
    config.get.mockImplementation((k: string, d: any) => (k === 'THEMES_DIR' ? tmp : d));
    const svc = new ThemeLoaderService(config, settings);
    return svc.onModuleInit().then(() => {
      // Falls back to builtins; classic should be findable via builtins
      const t = svc.getTheme('classic');
      expect(t).toBeDefined();
    });
  });
});