import { describe, it, expect, beforeEach, afterEach, jest } from '@jest/globals';
import AuthService from '../services/AuthService';
import UserService from '../services/UserService';
import ProductService from '../services/ProductService';
import OrderService from '../services/OrderService';
import AdService from '../services/AdService';
import CertificateService from '../services/CertificateService';
import ComplianceService from '../services/ComplianceService';
import db from '../config/database';

describe('Unit Test Cases', () => {
  // 认证服务测试
  describe('AuthService', () => {
    let authService: AuthService;

    beforeEach(() => {
      authService = new AuthService();
    });

    it('should authenticate user with valid credentials', async () => {
      // 模拟数据库查询
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: '1',
        username: 'testuser',
        password_hash: '$2b$10$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW' // password123
      }]);

      const result = await authService.authenticate('testuser', 'password123');
      expect(result.success).toBe(true);
      expect(result.token).toBeDefined();
    });

    it('should reject authentication with invalid credentials', async () => {
      // 模拟数据库查询返回空
      jest.spyOn(db, 'select').mockResolvedValue([]);

      const result = await authService.authenticate('testuser', 'wrongpassword');
      expect(result.success).toBe(false);
      expect(result.error).toBe('Invalid credentials');
    });

    it('should validate JWT token', async () => {
      const token = 'valid-token';
      const result = await authService.validateToken(token);
      expect(result).toBeDefined();
    });
  });

  // 用户服务测试
  describe('UserService', () => {
    let userService: UserService;

    beforeEach(() => {
      userService = new UserService();
    });

    it('should create user successfully', async () => {
      const userData = {
        username: 'newuser',
        email: 'newuser@example.com',
        password: 'password123',
        full_name: 'New User',
        role: 'OPERATOR',
        tenant_id: '1'
      };

      jest.spyOn(db, 'insert').mockResolvedValue(['1']);
      jest.spyOn(db, 'select').mockResolvedValue([]);

      const result = await userService.createUser(userData);
      expect(result.success).toBe(true);
      expect(result.userId).toBe('1');
    });

    it('should get user by ID', async () => {
      const userId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: userId,
        username: 'testuser',
        email: 'testuser@example.com'
      }]);

      const user = await userService.getUserById(userId);
      expect(user).toBeDefined();
      expect(user.id).toBe(userId);
    });

    it('should update user information', async () => {
      const userId = '1';
      const updateData = { full_name: 'Updated Name' };

      jest.spyOn(db, 'update').mockResolvedValue([1]);

      const result = await userService.updateUser(userId, updateData);
      expect(result.success).toBe(true);
    });
  });

  // 商品服务测试
  describe('ProductService', () => {
    let productService: ProductService;

    beforeEach(() => {
      productService = new ProductService();
    });

    it('should create product successfully', async () => {
      const productData = {
        title: 'Test Product',
        description: 'Test Description',
        price: 99.99,
        cost_price: 50.00,
        stock: 100,
        sku: 'TEST-001',
        category: 'Electronics',
        brand: 'Test Brand',
        tenant_id: '1',
        shop_id: '1',
        platform: 'Amazon',
        product_id: 'AMZ123',
        attributes: {},
        images: []
      };

      jest.spyOn(db, 'insert').mockResolvedValue(['1']);

      const result = await productService.createProduct(productData);
      expect(result.success).toBe(true);
      expect(result.productId).toBe('1');
    });

    it('should get product by ID', async () => {
      const productId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: productId,
        title: 'Test Product',
        price: 99.99
      }]);

      const product = await productService.getProductById(productId);
      expect(product).toBeDefined();
      expect(product.id).toBe(productId);
    });

    it('should update product stock', async () => {
      const productId = '1';
      const quantity = 50;

      jest.spyOn(db, 'update').mockResolvedValue([1]);

      const result = await productService.updateStock(productId, quantity);
      expect(result.success).toBe(true);
    });
  });

  // 订单服务测试
  describe('OrderService', () => {
    let orderService: OrderService;

    beforeEach(() => {
      orderService = new OrderService();
    });

    it('should create order successfully', async () => {
      const orderData = {
        tenant_id: '1',
        shop_id: '1',
        platform: 'Amazon',
        platform_order_id: 'AMZ-ORDER-001',
        customer_id: '1',
        customer_name: 'Test Customer',
        customer_email: 'customer@example.com',
        customer_phone: '1234567890',
        shipping_address: '123 Test St',
        billing_address: '123 Test St',
        subtotal: 199.98,
        shipping_fee: 10.00,
        tax: 15.00,
        total: 224.98,
        currency: 'USD',
        payment_method: 'CREDIT_CARD',
        items: [
          {
            product_id: '1',
            quantity: 2,
            unit_price: 99.99
          }
        ]
      };

      jest.spyOn(db, 'transaction').mockImplementation(async (callback) => {
        return await callback({});
      });

      const result = await orderService.createOrder(orderData);
      expect(result.success).toBe(true);
      expect(result.orderId).toBeDefined();
    });

    it('should get order by ID', async () => {
      const orderId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: orderId,
        platform_order_id: 'AMZ-ORDER-001',
        total: 224.98,
        status: 'PENDING'
      }]);

      const order = await orderService.getOrderById(orderId);
      expect(order).toBeDefined();
      expect(order.id).toBe(orderId);
    });

    it('should update order status', async () => {
      const orderId = '1';
      const status = 'PAID';

      jest.spyOn(db, 'update').mockResolvedValue([1]);

      const result = await orderService.updateOrderStatus(orderId, status);
      expect(result.success).toBe(true);
    });
  });

  // 广告服务测试
  describe('AdService', () => {
    let adService: AdService;

    beforeEach(() => {
      adService = new AdService();
    });

    it('should create advertisement successfully', async () => {
      const adData = {
        tenant_id: '1',
        shop_id: '1',
        name: 'Test Ad',
        campaign_id: '1',
        ad_group_id: '1',
        product_id: '1',
        platform: 'Google',
        budget: 100.00,
        bid: 1.00,
        ad_type: 'SEARCH',
        start_date: new Date(),
        status: 'ACTIVE'
      };

      jest.spyOn(db, 'insert').mockResolvedValue(['1']);

      const result = await adService.createAdvertisement(adData);
      expect(result.success).toBe(true);
      expect(result.adId).toBe('1');
    });

    it('should get advertisement by ID', async () => {
      const adId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: adId,
        name: 'Test Ad',
        status: 'ACTIVE'
      }]);

      const ad = await adService.getAdvertisementById(adId);
      expect(ad).toBeDefined();
      expect(ad.id).toBe(adId);
    });

    it('should update ad status', async () => {
      const adId = '1';
      const status = 'PAUSED';

      jest.spyOn(db, 'update').mockResolvedValue([1]);

      const result = await adService.updateAdStatus(adId, status);
      expect(result.success).toBe(true);
    });
  });

  // 证书服务测试
  describe('CertificateService', () => {
    let certificateService: CertificateService;

    beforeEach(() => {
      certificateService = new CertificateService();
    });

    it('should create certificate successfully', async () => {
      const certData = {
        tenant_id: '1',
        shop_id: '1',
        certificate_name: 'Test Certificate',
        certificate_type: 'CE',
        issuing_authority: 'Test Authority',
        certificate_number: 'CE-001',
        issue_date: new Date('2026-01-01'),
        expiry_date: new Date('2027-01-01'),
        file_path: '/path/to/cert.pdf',
        file_hash: 'hash123'
      };

      jest.spyOn(db, 'insert').mockResolvedValue(['1']);

      const result = await certificateService.createCertificate(certData);
      expect(result.success).toBe(true);
      expect(result.certificateId).toBe('1');
    });

    it('should get certificate by ID', async () => {
      const certId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: certId,
        certificate_name: 'Test Certificate',
        status: 'VALID'
      }]);

      const cert = await certificateService.getCertificateById(certId);
      expect(cert).toBeDefined();
      expect(cert.id).toBe(certId);
    });

    it('should check certificate validity', async () => {
      const certId = '1';
      jest.spyOn(db, 'select').mockResolvedValue([{
        id: certId,
        expiry_date: new Date('2027-01-01')
      }]);

      const result = await certificateService.checkValidity(certId);
      expect(result.valid).toBe(true);
    });
  });

  // 合规服务测试
  describe('ComplianceService', () => {
    let complianceService: ComplianceService;

    beforeEach(() => {
      complianceService = new ComplianceService();
    });

    it('should check product compliance', async () => {
      const productData = {
        product_id: '1',
        platform: 'Amazon',
        category: 'Electronics',
        certificates: ['CE', 'FCC']
      };

      jest.spyOn(db, 'select').mockResolvedValue([{
        required_certificates: ['CE', 'FCC'],
        prohibited_items: []
      }]);

      const result = await complianceService.checkProductCompliance(productData);
      expect(result.compliant).toBe(true);
    });

    it('should identify non-compliant product', async () => {
      const productData = {
        product_id: '1',
        platform: 'Amazon',
        category: 'Electronics',
        certificates: ['CE'] // Missing FCC
      };

      jest.spyOn(db, 'select').mockResolvedValue([{
        required_certificates: ['CE', 'FCC'],
        prohibited_items: []
      }]);

      const result = await complianceService.checkProductCompliance(productData);
      expect(result.compliant).toBe(false);
      expect(result.missingCertificates).toContain('FCC');
    });

    it('should check certificate requirements', async () => {
      const platform = 'Amazon';
      const category = 'Electronics';

      jest.spyOn(db, 'select').mockResolvedValue([{
        required_certificates: ['CE', 'FCC']
      }]);

      const requirements = await complianceService.getCertificateRequirements(platform, category);
      expect(requirements).toContain('CE');
      expect(requirements).toContain('FCC');
    });
  });

  // 清理测试
  afterEach(() => {
    jest.clearAllMocks();
  });
});

// 工具函数测试
describe('Utility Functions', () => {
  it('should format currency correctly', () => {
    const amount = 1234.56;
    const formatted = new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: 'USD'
    }).format(amount);
    expect(formatted).toBe('$1,234.56');
  });

  it('should validate email format', () => {
    const validEmail = 'test@example.com';
    const invalidEmail = 'test@';
    
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    expect(emailRegex.test(validEmail)).toBe(true);
    expect(emailRegex.test(invalidEmail)).toBe(false);
  });

  it('should generate random ID', () => {
    const id = Math.random().toString(36).substr(2, 9);
    expect(id).toHaveLength(9);
  });
});

// 数据验证测试
describe('Data Validation', () => {
  it('should validate required fields', () => {
    const validateRequired = (obj: any, fields: string[]) => {
      const errors: string[] = [];
      fields.forEach(field => {
        if (!obj[field]) {
          errors.push(`${field} is required`);
        }
      });
      return errors;
    };

    const data = { name: 'Test', email: '' };
    const errors = validateRequired(data, ['name', 'email']);
    expect(errors).toContain('email is required');
    expect(errors).not.toContain('name is required');
  });

  it('should validate number range', () => {
    const validateRange = (value: number, min: number, max: number) => {
      return value >= min && value <= max;
    };

    expect(validateRange(5, 1, 10)).toBe(true);
    expect(validateRange(0, 1, 10)).toBe(false);
    expect(validateRange(11, 1, 10)).toBe(false);
  });

  it('should validate date format', () => {
    const validateDate = (dateString: string) => {
      const date = new Date(dateString);
      return !isNaN(date.getTime());
    };

    expect(validateDate('2026-03-18')).toBe(true);
    expect(validateDate('invalid-date')).toBe(false);
  });
});
