# Phase 10: Production Management - COMPLETE ✅

## Overview
Phase 10 implements a comprehensive production management system with BOM (Bill of Materials) management and production order processing. The system supports creating production orders, checking raw material availability, and confirming production by consuming raw materials and creating finished goods with UID generation.

## Implementation Details

### 1. BOM (Bill of Materials) Service
**File:** `server/modules/production/services/boms.js`

Implemented the following functions:
- **createBOM**: Creates a new BOM with items for a finished good variant
  - Validates finished good variant exists and is type FG
  - Validates raw material products exist and are type RM
  - Ensures one BOM per variant
  - Creates BOM and all BOM items atomically
  
- **getBOM**: Retrieves a BOM by ID with all associations
  - Includes finished good variant and product
  - Includes all BOM items with raw material products
  
- **getBOMByVariant**: Retrieves a BOM by finished good variant ID
  - Useful for production order creation
  
- **updateBOM**: Updates a BOM (can replace items)
  - Validates new items
  - Deletes old items and creates new ones
  
- **deleteBOM**: Deletes a BOM (items cascade deleted)
  
- **listBOMs**: Lists BOMs with optional filters and pagination
  - Supports filtering by finished good variant ID
  - Paginated results

### 2. Production Order Service
**File:** `server/modules/production/services/productionOrders.js`

Implemented the following functions:
- **createProductionOrder**: Creates a new production order
  - Validates finished good variant exists and is type FG
  - Ensures BOM exists for the variant
  - Supports DRAFT and CONFIRMED status
  
- **getProductionOrder**: Retrieves a production order by ID with associations
  
- **listProductionOrders**: Lists production orders with optional filters and pagination
  - Supports filtering by finished good variant ID and status
  - Paginated results
  
- **checkAvailability**: Checks if sufficient raw materials are available
  - Calculates required quantity for each raw material (quantity_per_unit × production quantity)
  - Checks current inventory availability
  - Returns detailed availability report
  
- **confirmProduction**: Confirms production by consuming raw materials and creating finished goods
  - **Transaction-based**: Entire operation is atomic (all or nothing)
  - **Raw Material Consumption**:
    - Consumes raw materials from inventory (quantity-based)
    - Creates inventory movements with reason PRODUCTION_CONSUME
    - Validates sufficient stock before consuming
  - **Finished Good Creation**:
    - Option to generate UIDs for finished goods (default: true)
    - If UIDs generated: Creates InventoryItem records with UIDs and barcodes
    - Syncs quantity-based inventory with UID-based inventory
    - Creates inventory movements with reason PRODUCTION_OUTPUT
    - If UIDs not generated: Only updates quantity-based inventory
  - Updates production order status to CONFIRMED
  - Records confirmed_at timestamp

### 3. Controllers
**File:** `server/modules/production/controllers/index.js`

Implemented controllers for:
- BOM operations: createBOM, getBOM, getBOMByVariant, updateBOM, deleteBOM, listBOMs
- Production order operations: createProductionOrder, getProductionOrder, listProductionOrders, checkAvailability, confirmProduction

All controllers:
- Use asyncHandler for error handling
- Extract data from request (body, params, query)
- Call appropriate service functions
- Return standardized responses using successResponse helper
- Log operations using logger

### 4. Validations
**File:** `server/modules/production/validations/index.js`

Implemented comprehensive validation rules for:
- BOM creation: fg_variant_id (required), items array (required, min 1), item validation
- BOM retrieval: ID and variant ID validation
- BOM update: ID validation, optional items replacement
- BOM deletion: ID validation
- BOM listing: Optional filters and pagination
- Production order creation: fg_variant_id (required), quantity (required), optional status
- Production order retrieval: ID validation
- Production order listing: Optional filters and pagination
- Availability check: Production order ID validation
- Production confirmation: Production order ID validation, optional generateUIDs boolean

### 5. Routes
**File:** `server/modules/production/routes/index.js`

Implemented RESTful routes:

**BOM Routes:**
- `POST /api/production/boms` - Create BOM (manager, system_admin)
- `GET /api/production/boms` - List BOMs (authenticated)
- `GET /api/production/boms/:id` - Get BOM by ID (authenticated)
- `GET /api/production/boms/variant/:variantId` - Get BOM by variant ID (authenticated)
- `PUT /api/production/boms/:id` - Update BOM (manager, system_admin)
- `DELETE /api/production/boms/:id` - Delete BOM (manager, system_admin)

**Production Order Routes:**
- `POST /api/production/orders` - Create production order (manager, system_admin, cashier)
- `GET /api/production/orders` - List production orders (authenticated)
- `GET /api/production/orders/:id` - Get production order by ID (authenticated)
- `GET /api/production/orders/:id/check-availability` - Check RM availability (authenticated)
- `POST /api/production/orders/:id/confirm` - Confirm production (manager, system_admin)

All routes:
- Use authentication middleware
- Use role-based access control where appropriate
- Include request validation
- Have Swagger documentation

### 6. Service Integration
**File:** `server/modules/production/services/index.js`

Exports all production services in a clean, organized structure:
- BOM services (createBOM, getBOM, getBOMByVariant, updateBOM, deleteBOM, listBOMs)
- Production order services (createProductionOrder, getProductionOrder, listProductionOrders, checkAvailability, confirmProduction)

### 7. Routes Integration
**File:** `server/routes/index.js`

Added production routes to main routes file:
- `router.use('/production', productionRoutes)`

## Key Features

### 1. Atomic Production Confirmation
Production confirmation is fully transactional:
- All raw materials are consumed atomically
- All finished goods are created atomically
- If any step fails, entire operation is rolled back
- Ensures data consistency

### 2. Raw Material Availability Check
Before confirming production:
- System checks availability of all required raw materials
- Calculates required quantity based on BOM (quantity_per_unit × production quantity)
- Returns detailed availability report
- Prevents production if insufficient raw materials

### 3. Dual Inventory Support
Production confirmation supports both inventory tracking methods:
- **UID-Based**: Generates unique UIDs and barcodes for finished goods (if track_inventory is enabled)
- **Quantity-Based**: Updates quantity-based inventory for finished goods
- Both methods are synchronized

### 4. Inventory Movement Tracking
All inventory changes are tracked:
- **PRODUCTION_CONSUME**: Raw material consumption movements
- **PRODUCTION_OUTPUT**: Finished good creation movements
- Includes reference to production order ID
- Includes user ID (for production confirmation)

### 5. BOM Validation
Comprehensive validation ensures:
- Finished good variants must belong to FG products
- Raw materials must be RM products
- One BOM per finished good variant
- All quantities are positive

## API Endpoints Summary

### BOM Endpoints
- `POST /api/production/boms` - Create BOM
- `GET /api/production/boms` - List BOMs
- `GET /api/production/boms/:id` - Get BOM by ID
- `GET /api/production/boms/variant/:variantId` - Get BOM by variant ID
- `PUT /api/production/boms/:id` - Update BOM
- `DELETE /api/production/boms/:id` - Delete BOM

### Production Order Endpoints
- `POST /api/production/orders` - Create production order
- `GET /api/production/orders` - List production orders
- `GET /api/production/orders/:id` - Get production order by ID
- `GET /api/production/orders/:id/check-availability` - Check RM availability
- `POST /api/production/orders/:id/confirm` - Confirm production

## Testing Checklist

- [x] Create BOM for a finished good variant
- [x] Retrieve BOM by ID
- [x] Retrieve BOM by variant ID
- [x] Update BOM (replace items)
- [x] Delete BOM
- [x] List BOMs with filters
- [x] Create production order
- [x] Retrieve production order
- [x] List production orders with filters
- [x] Check raw material availability
- [x] Confirm production (with UID generation)
- [x] Confirm production (without UID generation)
- [x] Verify raw materials are consumed
- [x] Verify finished goods are created
- [x] Verify inventory movements are created
- [x] Verify transaction rollback on error

## Dependencies

- Phase 2: Products (Product, ProductVariant models)
- Phase 6: Inventory (Inventory, InventoryItem, InventoryMovement models and services)
- BOM and ProductionOrder models (already existed)

## Notes

1. **Transaction Safety**: Production confirmation uses Sequelize transactions to ensure atomicity
2. **Inventory Synchronization**: UID-based and quantity-based inventory are kept in sync during production
3. **Error Handling**: Comprehensive error handling with appropriate error messages
4. **Validation**: All inputs are validated before processing
5. **Audit Trail**: All inventory changes are tracked through InventoryMovement records
6. **Role-Based Access**: Appropriate role-based access control for sensitive operations

## Next Steps

Phase 10 is complete. The production management system is fully functional and integrated with the inventory system. All endpoints are operational and ready for use.

