# 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 (Partial - 2/8 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

#### ⏳ Remaining Services to Migrate:
3. **locations.service.ts** - Needs TypeORM migration
   - Current: Uses raw SQL queries
   - Todo: Convert to Repository pattern with QueryBuilder
   - Key features: Hierarchical locations, parent-child relationships

4. **lots.service.ts** - Needs TypeORM migration
   - Current: Uses raw SQL queries
   - Todo: Convert to Repository pattern
   - Key features: Expiration tracking, stock quantity aggregation

5. **pickings.service.ts** - Needs TypeORM migration (COMPLEX)
   - Current: Uses raw SQL with transactions
   - Todo: Convert to TypeORM with QueryRunner for transactions
   - Key features: Multi-line operations, status workflows, stock updates

6. **adjustments.service.ts** - Needs TypeORM migration (COMPLEX)
   - Current: Uses raw SQL with transactions
   - Todo: Convert to TypeORM with QueryRunner
   - Key features: Multi-line operations, theoretical vs counted quantities

7. **valuation.service.ts** - Needs TypeORM migration (COMPLEX)
   - Current: Uses raw SQL with client transactions
   - Todo: Convert to TypeORM while maintaining FIFO logic
   - Key features: Valuation layer management, FIFO consumption

8. **stock-quants.service.ts** - NEW SERVICE NEEDED
   - Currently no dedicated service (operations are in other services)
   - Should handle: Stock queries, reservations, availability checks

### 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** - Needs snake_case/camelCase handling
  - Current: Only accepts snake_case from frontend
  - Todo: Add transformers or accept both formats
  - Pattern: Use class-transformer decorators or manual mapping

### 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** - Simple, good next step
3. **Migrate lots.service.ts** - Simple, includes aggregations

### Medium Priority
4. **Create stock-quants.service.ts** - New service for stock operations
5. **Migrate pickings.service.ts** - Complex transactions
6. **Migrate adjustments.service.ts** - Complex transactions

### Lower Priority
7. **Migrate valuation.service.ts** - Most complex, FIFO logic
8. **Update controller for case handling** - Nice to have
9. **Add integration tests** - Verify TypeORM migration works correctly

## 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.
