import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import fs from 'fs';
import path from 'path';
import { loadWaasConfigs, FALLBACK_SITE_CONFIG, FALLBACK_THEME_CONFIG, FALLBACK_SMTP_CONFIG } from '../src/utils/configLoader';
import { THEME_PRESETS } from '../src/utils/themePresets';

describe('WaaS Engine Core Unit Tests', () => {
  const testDataDir = path.join(process.cwd(), 'app', 'test_data');

  beforeEach(() => {
    process.env.DATA_DIR = testDataDir;
    if (fs.existsSync(testDataDir)) {
      fs.rmSync(testDataDir, { recursive: true, force: true });
    }
  });

  afterEach(() => {
    if (fs.existsSync(testDataDir)) {
      fs.rmSync(testDataDir, { recursive: true, force: true });
    }
  });

  it('1. Should return fallbacks when JSON files do not exist (Zero-Crash Guarantee)', () => {
    const configs = loadWaasConfigs('');
    expect(configs.siteConfig.siteName).toBe(FALLBACK_SITE_CONFIG.siteName);
    expect(configs.themeConfig.activePreset).toBe(FALLBACK_THEME_CONFIG.activePreset);
    expect(configs.smtpConfig.host).toBe(FALLBACK_SMTP_CONFIG.host);
  });

  it('2. Should dynamically merge custom site.config.json', () => {
    fs.mkdirSync(testDataDir, { recursive: true });
    const customSite = { siteName: 'Custom Test Agency', hero: { title: 'Custom Title' } };
    fs.writeFileSync(path.join(testDataDir, 'site.config.json'), JSON.stringify(customSite), 'utf8');

    const configs = loadWaasConfigs('');
    expect(configs.siteConfig.siteName).toBe('Custom Test Agency');
    expect(configs.siteConfig.hero.title).toBe('Custom Title');
    expect(configs.siteConfig.hero.badge).toBe(FALLBACK_SITE_CONFIG.hero.badge);
  });

  it('3. Should have 10 valid Theme Presets with root CSS color tokens', () => {
    const presetKeys = Object.keys(THEME_PRESETS);
    expect(presetKeys.length).toBe(10);
    expect(THEME_PRESETS.corporateDark.colors.bg).toBe('#0B0F19');
    expect(THEME_PRESETS.corporateDark.colors.accent).toBe('#38BDF8');
  });

  it('4. Should support dynamic UIComponent elements in SectionConfig', () => {
    const heroElements = FALLBACK_SITE_CONFIG.hero.elements || [];
    expect(heroElements.length).toBeGreaterThan(0);
    expect(heroElements[0].type).toBe('badge');
  });

  it('5. Should load device-specific configs for desktop, mobile, tablet with fallback', () => {
    fs.mkdirSync(testDataDir, { recursive: true });
    fs.writeFileSync(path.join(testDataDir, 'site.mobile.config.json'), JSON.stringify({ siteName: 'Mobile Site' }), 'utf8');
    fs.writeFileSync(path.join(testDataDir, 'site.tablet.config.json'), JSON.stringify({ siteName: 'Tablet Site' }), 'utf8');
    fs.writeFileSync(path.join(testDataDir, 'site.desktop.config.json'), JSON.stringify({ siteName: 'Desktop Site' }), 'utf8');

    const mobileConfig = loadWaasConfigs('Mozilla/5.0 (iPhone; CPU iPhone OS 14_0 like Mac OS X)');
    expect(mobileConfig.siteConfig.siteName).toBe('Mobile Site');

    const tabletConfig = loadWaasConfigs('Mozilla/5.0 (iPad; CPU OS 14_0 like Mac OS X)');
    expect(tabletConfig.siteConfig.siteName).toBe('Tablet Site');

    const desktopConfig = loadWaasConfigs('Mozilla/5.0 (Windows NT 10.0; Win64; x64)');
    expect(desktopConfig.siteConfig.siteName).toBe('Desktop Site');
  });
});