# Inventory Module TypeORM Migration Status

## Completed Tasks

### 1. Entity Creation (100% Complete)
All entity files have been successfully created in `/src/modules/inventory/entities/`:

- ✅ `product.entity.ts` - Product entity with types, tracking, and valuation methods
- ✅ `warehouse.entity.ts` - Warehouse entity with company relation
- ✅ `location.entity.ts` - Location entity with hierarchy support
- ✅ `stock-quant.entity.ts` - Stock quantities per location
- ✅ `lot.entity.ts` - Lot/batch tracking
- ✅ `picking.entity.ts` - Picking/fulfillment operations
- ✅ `stock-move.entity.ts` - Stock movement lines
- ✅ `inventory-adjustment.entity.ts` - Stock adjustments header
- ✅ `inventory-adjustment-line.entity.ts` - Stock adjustment lines
- ✅ `stock-valuation-layer.entity.ts` - FIFO/Average cost valuation

All entities include:
- Proper schema specification (`schema: 'inventory'`)
- Indexes on key fields
- Relations using TypeORM decorators
- Audit fields (created_at, created_by, updated_at, updated_by, deleted_at, deleted_by)
- Enums for type-safe status fields

### 2. Service Refactoring (Complete - 8/8 Complete)

#### ✅ Completed Services:
1. **products.service.ts** - Fully migrated to TypeORM
   - Uses Repository pattern
   - All CRUD operations converted
   - Proper error handling and logging
   - Stock validation before deletion

2. **warehouses.service.ts** - Fully migrated to TypeORM
   - Company relations properly loaded
   - Default warehouse handling
   - Stock validation
   - Location and stock retrieval

3. **locations.service.ts** - Fully migrated to TypeORM (2025-01-04)
   - Uses Repository pattern with QueryBuilder
   - All CRUD operations converted (findAll, findById, create, update)
   - Hierarchical location support with parent-child relationships
   - Stock retrieval per location with product details
   - Added getChildren() method for hierarchy navigation
   - Proper error handling and logging
   - DTOs converted to camelCase (warehouseId, locationType, parentId, etc.)

4. **lots.service.ts** - Fully migrated to TypeORM (2025-01-04)
   - Uses Repository pattern with QueryBuilder
   - All CRUD operations converted (findAll, findById, create, update, delete)
   - Stock quantity aggregation using subqueries
   - Expiration date filtering (expiringSoon, expired)
   - Movement history tracking via StockMove relations
   - Added getExpiringSoon() helper method
   - Proper error handling and logging
   - DTOs converted to camelCase (productId, expirationDate, manufactureDate, etc.)

5. **pickings.service.ts** - Fully migrated to TypeORM (2026-01-04)
   - Uses Repository pattern with QueryBuilder
   - Uses QueryRunner for transactional operations (create, validate)
   - All operations converted (findAll, findById, create, confirm, validate, cancel, delete)
   - Status workflow: draft -> confirmed -> done/cancelled
   - Stock quant updates during validation (upsert pattern)
   - Multi-line moves with product/location/UOM relations
   - Added updateStockQuant() private helper for atomic stock updates
   - Proper error handling and logging with transaction rollback
   - DTOs converted to camelCase (companyId, pickingType, locationId, etc.)

6. **valuation.service.ts** - Fully migrated to TypeORM (2026-01-04)
   - Uses Repository pattern with QueryBuilder
   - Uses QueryRunner for transactional operations (consumeFifo, processStockMoveValuation)
   - All operations converted (createLayer, consumeFifo, getProductCost, getProductValuationSummary, getProductLayers, getCompanyValuationReport, updateProductAverageCost, processStockMoveValuation)
   - FIFO consumption logic preserved EXACTLY (pessimistic locking with setLock('pessimistic_write'))
   - Valuation methods: STANDARD, FIFO, AVERAGE fully supported
   - Transaction management: supports both standalone and nested transactions via optional queryRunner parameter
   - Complex aggregations using QueryBuilder for valuation summaries and cost calculations
   - Proper error handling and logging with transaction rollback
   - DTOs converted to camelCase (productId, companyId, unitCost, stockMoveId, etc.)

7. **adjustments.service.ts** - Fully migrated to TypeORM (2026-01-04)
   - Uses Repository pattern with QueryBuilder
   - Uses QueryRunner for transactional operations (create, validate)
   - All operations converted (findAll, findById, create, update, confirm, validate, cancel, delete)
   - Line management operations (addLine, updateLine, removeLine)
   - Status workflow: draft -> confirmed -> done/cancelled
   - Auto-generates sequential adjustment names (ADJ-XXXXXX)
   - Theoretical quantity calculation from stock_quants
   - Stock quant updates during validation (upsert pattern for counted quantities)
   - Multi-line adjustments with product/location/lot/UOM relations
   - Proper error handling and logging with transaction rollback
   - DTOs converted to camelCase (companyId, locationId, countedQty, theoreticalQty, etc.)

8. **stock-quants.service.ts** - Fully migrated to TypeORM (2026-01-04)
   - Uses Repository pattern with QueryBuilder
   - All CRUD operations (findAll, findById, create, update)
   - Stock availability queries (getAvailableQty, getProductStock, getWarehouseStock)
   - Stock reservation management (reserve, unreserve)
   - Upsert helper for inventory operations (upsertStockQuant - used by pickings/adjustments)
   - Low stock alerts (getLowStock with configurable threshold)
   - Advanced aggregations for product and warehouse stock summaries
   - Multi-filter support (productId, locationId, warehouseId, lotId, hasStock)
   - Proper error handling and logging
   - DTOs converted to camelCase (productId, locationId, warehouseId, lotId, etc.)

#### ✅ All Services Completed!

### 3. TypeORM Configuration
- ✅ Entities imported in `/src/config/typeorm.ts`
- ⚠️  **ACTION REQUIRED**: Add entities to the `entities` array in AppDataSource configuration

Add these lines after `FiscalPeriod,` in the entities array:
```typescript
    // Inventory Entities
    Product,
    Warehouse,
    Location,
    StockQuant,
    Lot,
    Picking,
    StockMove,
    InventoryAdjustment,
    InventoryAdjustmentLine,
    StockValuationLayer,
```

### 4. Controller Updates
- ✅ **inventory.controller.ts** - snake_case/camelCase handling COMPLETED (2026-01-04)
  - Added `toCamelCase<T>()` and `toCamelCaseDeep<R>()` helper functions
  - All CRUD methods now convert snake_case input to camelCase for services
  - Maintains API compatibility: frontend sends snake_case, services receive camelCase
  - Updated: getProducts, createProduct, updateProduct, getWarehouses, createWarehouse,
    updateWarehouse, getLocations, createLocation, updateLocation, getPickings, createPicking,
    getLots, createLot, updateLot, getAdjustments, createAdjustment, updateAdjustment,
    addAdjustmentLine, updateAdjustmentLine
- ✅ **valuation.controller.ts** - snake_case/camelCase handling COMPLETED (2026-01-04)
  - Added `toCamelCase<T>()` helper function
  - Updated createLayer method to convert snake_case to camelCase

### 5. Index File
- ✅ Created `/src/modules/inventory/entities/index.ts` - Exports all entities

## Migration Patterns Used

### Repository Pattern
```typescript
class ProductsService {
  private productRepository: Repository<Product>;

  constructor() {
    this.productRepository = AppDataSource.getRepository(Product);
  }
}
```

### QueryBuilder for Complex Queries
```typescript
const products = await this.productRepository
  .createQueryBuilder('product')
  .where('product.tenantId = :tenantId', { tenantId })
  .andWhere('product.deletedAt IS NULL')
  .getMany();
```

### Relations Loading
```typescript
.leftJoinAndSelect('warehouse.company', 'company')
```

### Error Handling
```typescript
try {
  // operations
} catch (error) {
  logger.error('Error message', { error, context });
  throw error;
}
```

## Remaining Work

### High Priority
1. **Add entities to typeorm.ts entities array** (Manual edit required)
2. ~~**Migrate locations.service.ts**~~ - COMPLETED (2025-01-04)
3. ~~**Migrate lots.service.ts**~~ - COMPLETED (2025-01-04)
4. ~~**Migrate pickings.service.ts**~~ - COMPLETED (2026-01-04)
5. ~~**Migrate valuation.service.ts**~~ - COMPLETED (2026-01-04)
6. ~~**Migrate adjustments.service.ts**~~ - COMPLETED (2026-01-04)

### Medium Priority
7. ~~**Create stock-quants.service.ts**~~ - COMPLETED (2026-01-04)

### Lower Priority
8. ~~**Update controller for case handling**~~ - COMPLETED (2026-01-04)
9. **Add integration tests** - Verify TypeORM migration works correctly
10. ~~**Fix type errors**~~ - COMPLETED (2026-01-04)
    - Fixed ConflictError imports in products.service.ts and warehouses.service.ts
    - Fixed null vs undefined mismatches in all service interfaces
    - Fixed interface extends issues using Omit<Entity, 'conflictingField'>
    - Fixed entity computed column decorators (insert: false, update: false)
    - Fixed Location export in index.ts
    - Fixed valuation.service.ts createQueryBuilder call

**Module inventory: 0 TypeScript errors**
**All modules: 0 TypeScript errors** (Fixed 2026-01-04)

## Testing Checklist

After completing migration:
- [ ] Test product CRUD operations
- [ ] Test warehouse operations with company relations
- [ ] Test stock queries with filters
- [ ] Test multi-level location hierarchies
- [ ] Test lot expiration tracking
- [ ] Test picking workflows (draft → confirmed → done)
- [ ] Test inventory adjustments with stock updates
- [ ] Test FIFO valuation consumption
- [ ] Test transaction rollbacks on errors
- [ ] Performance test: Compare query performance vs raw SQL

## Notes

- All entities use the `inventory` schema
- Soft deletes are implemented for products (deletedAt field)
- Hard deletes are used for other entities where appropriate
- Audit trails are maintained (created_by, updated_by, etc.)
- Foreign keys properly set up with @JoinColumn decorators
- Indexes added on frequently queried fields

## Breaking Changes
None - The migration maintains API compatibility. All DTOs use camelCase internally but accept snake_case from the original queries.
