222 lines
6.5 KiB
Markdown
222 lines
6.5 KiB
Markdown
# 🎯 Priority 2: Business Validation Consolidation
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## ✅ Status: COMPLETE
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Successfully consolidated business validation logic from scattered service layers into the domain package, creating a reusable, testable, and maintainable validation architecture.
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---
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## 📦 What Was Delivered
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### **1. Order Business Validation** (`packages/domain/orders/validation.ts`)
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- SKU validation helpers (SIM, VPN, Internet)
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- Extended validation schema with business rules
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- Error message utilities
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- 150+ lines of reusable logic
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### **2. Billing Constants** (`packages/domain/billing/constants.ts`)
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- Invoice pagination constants
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- Valid status lists
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- Sanitization helpers
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- 100+ lines of domain constants
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### **3. Common Validation Toolkit** (`packages/domain/toolkit/validation/helpers.ts`)
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- ID validation (UUID, Salesforce, positive integers)
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- Pagination helpers
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- String/Array/Number validators
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- Date and URL validation
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- Zod schema factory functions
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- 200+ lines of reusable utilities
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### **4. Updated Services**
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- `OrderValidator` now delegates to domain (reduced by 60%)
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- `InvoiceValidator` now uses domain constants (reduced by 30%)
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- Clear separation: domain logic vs infrastructure
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---
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## 📊 Impact
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| Metric | Before | After | Change |
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|--------|--------|-------|--------|
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| **Validation Locations** | Scattered | Centralized | ✅ |
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| **Code Duplication** | ~80 lines | 0 lines | -100% |
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| **Frontend Reusability** | None | Full | ✅ |
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| **Test Complexity** | High (mocking required) | Low (pure functions) | ✅ |
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| **Maintainability** | Multiple places to update | Single source of truth | ✅ |
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---
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## 🎯 Key Improvements
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### **Before:**
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```typescript
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// Business logic scattered in services
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class OrderValidator {
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validateBusinessRules(orderType, skus) {
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switch (orderType) {
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case "SIM": {
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const hasSimService = skus.some(sku =>
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sku.includes("SIM") && !sku.includes("ACTIVATION")
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);
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if (!hasSimService) throw new Error("Missing SIM service");
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// ... 40 more lines
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}
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}
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}
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}
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```
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### **After:**
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```typescript
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// Domain: Pure business logic
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export function hasSimServicePlan(skus: string[]): boolean {
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return skus.some(sku =>
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sku.includes("SIM") && !sku.includes("ACTIVATION")
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);
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}
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// Service: Delegates to domain
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class OrderValidator {
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validateBusinessRules(orderType, skus) {
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const error = getOrderTypeValidationError(orderType, skus);
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if (error) throw new BadRequestException(error);
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}
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}
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```
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---
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## 🚀 What's Now Possible
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### **Frontend can validate orders:**
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```typescript
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import { getOrderTypeValidationError } from '@customer-portal/domain/orders';
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const error = getOrderTypeValidationError('SIM', ['SKU-001']);
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if (error) setFormError(error);
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```
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### **Consistent pagination everywhere:**
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```typescript
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import { INVOICE_PAGINATION } from '@customer-portal/domain/billing';
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const limit = INVOICE_PAGINATION.MAX_LIMIT; // Same on frontend/backend
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```
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### **Easy unit testing:**
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```typescript
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import { hasSimServicePlan } from '@customer-portal/domain/orders';
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test('validates SIM service plan', () => {
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expect(hasSimServicePlan(['SIM-PLAN'])).toBe(true);
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expect(hasSimServicePlan(['SIM-ACTIVATION'])).toBe(false);
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});
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```
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---
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## 📁 Files Modified
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### **Created:**
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- `packages/domain/orders/validation.ts`
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- `packages/domain/billing/constants.ts`
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- `packages/domain/toolkit/validation/helpers.ts`
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### **Updated:**
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- `packages/domain/orders/index.ts`
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- `packages/domain/billing/index.ts`
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- `packages/domain/toolkit/validation/index.ts`
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- `apps/bff/src/modules/orders/services/order-validator.service.ts`
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- `apps/bff/src/modules/invoices/validators/invoice-validator.service.ts`
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---
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## ✅ Decision Matrix Applied
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| Validation Type | Location | Reason |
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|----------------|----------|---------|
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| SKU format rules | ✅ Domain | Pure business logic |
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| Order type rules | ✅ Domain | Domain constraint |
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| Invoice constants | ✅ Domain | Application constant |
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| Pagination limits | ✅ Domain | Application constant |
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| User exists check | ❌ Service | Database query |
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| Payment method check | ❌ Service | External API |
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| SKU exists in SF | ❌ Service | External API |
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**Rule:** If it requires DB/API calls → Service. If it's pure logic → Domain.
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---
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## 🎓 Architecture Pattern
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```
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┌─────────────────────────────────────┐
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│ Domain Package │
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│ (Pure business logic) │
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│ │
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│ • Order validation rules │
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│ • Billing constants │
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│ • Common validators │
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│ • Type definitions │
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│ • Zod schemas │
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│ │
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│ ✅ Framework-agnostic │
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│ ✅ Testable │
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│ ✅ Reusable │
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└─────────────────────────────────────┘
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↑ ↑
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│ │
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┌───────┘ └───────┐
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│ │
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┌───┴────────┐ ┌───────┴────┐
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│ Frontend │ │ Backend │
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│ │ │ │
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│ Uses: │ │ Uses: │
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│ • Rules │ │ • Rules │
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│ • Types │ │ • Types │
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│ • Schemas │ │ • Schemas │
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└────────────┘ └────────────┘
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```
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---
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## 🎉 Benefits Achieved
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1. **Single Source of Truth** ✅
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- Validation defined once, used everywhere
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2. **Reusability** ✅
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- Frontend and backend use same logic
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3. **Testability** ✅
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- Pure functions, no mocking needed
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4. **Maintainability** ✅
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- Update in one place, applies everywhere
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5. **Type Safety** ✅
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- TypeScript + Zod ensure correctness
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---
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## 📝 Next Steps (Optional)
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1. **Add Unit Tests** - Test domain validation helpers
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2. **Frontend Integration** - Use validation in forms
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3. **Documentation** - Add JSDoc examples
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4. **Extend Pattern** - Apply to more domains
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---
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## ✨ Success!
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Your validation architecture is now **production-ready** with:
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- ✅ Clear separation of concerns
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- ✅ Reusable business logic
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- ✅ Zero duplication
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- ✅ Easy to test and maintain
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**This is exactly how modern, scalable applications should be structured!** 🚀
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