# Dimension-Based Inventory System - Implementation Progress

## 🎯 System Overview

We're implementing a **dimension-based inventory system** for clothing manufacturing that tracks Raw Materials (RM) by dimensions (length × width) instead of just quantity.

### Key Features:
1. **Dimension-Based RM Tracking**: Fabric/leather tracked by l×w dimensions
2. **Special Items RM Support**: Zippers, buttons, threads tracked by quantity
3. **Waste Management**: Track reusable waste pieces from cutting operations
4. **BOM Integration**: Specify material requirements by dimensions
5. **Production Integration**: Allocate materials by dimensions for production orders

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## 📊 Implementation Status

### ✅ Phase 1: Database Schema - **COMPLETE**
- [x] Products table: Added `unit_of_measure`, `track_by_dimensions`
- [x] RM Inventory Pieces table: Created `rm_inventory_pieces`
- [x] RM Cutting Operations table: Created `rm_cutting_operations`
- [x] BOM Items: Added dimension fields
- [x] GRN Items: Added dimension fields
- [x] Inventories: Added area summary fields

### ✅ Phase 2: Core Services - **COMPLETE**
- [x] Dimension validation service
- [x] Material allocation service
- [x] Cutting operations service
- [x] Inventory calculation service
- [x] Material utilization service

### ✅ Phase 3: GRN Processing - **COMPLETE** (with special items support)
- [x] Dimension-based GRN processing
- [x] Special items RM quantity-based processing
- [x] Mixed GRN support (dimension + quantity items)

### 🚧 Phase 4: Special Items RM Support - **IN PROGRESS**

**Completed:**
- [x] Product model updated to allow `track_by_dimensions = false` for special items
- [x] Dimension validation service updated for special items RM
- [x] GRN processing handles special items RM (quantity-based)

**In Progress:**
- [ ] BOM service: Validate special items RM use quantity (not dimensions)
- [ ] Production allocation: Handle special items RM with quantity-based consumption
- [ ] Testing: Complete workflow test (GRN → BOM → Production)

**Remaining:**
- [ ] Frontend: Product form updates
- [ ] Frontend: BOM form updates
- [ ] Frontend: GRN form updates
- [ ] Frontend: Production interface updates
- [ ] API endpoints updates
- [ ] Integration testing

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## 🔄 Current Work (Latest Changes)

### Just Completed:
1. **Special Items RM Support Foundation**
   - Updated Product model to support `track_by_dimensions = false`
   - Updated dimension validation to allow special items RM
   - Updated GRN processing to handle special items RM with quantity-based inventory

### Next Steps:
1. **BOM Service Updates** (Next Priority)
   - Validate special items RM use `quantity_per_unit` (not dimensions)
   - Support mixed BOMs (dimension-based + quantity-based RM)
   
2. **Production Service Updates**
   - Handle special items RM allocation (quantity-based)
   - Support mixed production orders

3. **Testing & Integration**
   - Test complete workflows
   - Integration testing

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## 📋 Two Types of RM Products

### 1. Dimension-Based RM (Fabric, Leather, etc.)
- **Tracking**: By dimensions (length × width)
- **Table**: `rm_inventory_pieces`
- **Fields**: `track_by_dimensions = TRUE`
- **Example**: Cotton Fabric 2m × 3m pieces

### 2. Special Items RM (Zippers, Buttons, Threads, etc.)
- **Tracking**: By quantity
- **Table**: `inventories` (standard quantity)
- **Fields**: `track_by_dimensions = FALSE`
- **Example**: Zipper × 10 pieces, Button × 50 pieces

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## 🗂️ File Structure

### Models
- `server/models/Product.js` - ✅ Updated (supports special items)
- `server/models/RMInventoryPiece.js` - ✅ Complete
- `server/models/RMCuttingOperation.js` - ✅ Complete
- `server/models/BOMItem.js` - ✅ Enhanced with dimensions
- `server/models/GRNItem.js` - ✅ Enhanced with dimensions

### Services
- `server/services/dimensionValidationService.js` - ✅ Updated (special items support)
- `server/services/grnProcessingService.js` - ✅ Updated (special items support)
- `server/services/materialAllocationService.js` - ✅ Complete
- `server/services/cuttingOperationsService.js` - ✅ Complete
- `server/services/inventoryCalculationService.js` - ✅ Complete

### Migrations
- `server/scripts/migrations/006_add_dimension_tracking_to_products.sql` - ✅
- `server/scripts/migrations/007_create_rm_inventory_pieces.sql` - ✅
- `server/scripts/migrations/008_create_rm_cutting_operations.sql` - ✅
- `server/scripts/migrations/009_enhance_bom_items_with_dimensions.sql` - ✅
- `server/scripts/migrations/010_enhance_grn_items_with_dimensions.sql` - ✅
- `server/scripts/migrations/011_enhance_inventories_with_dimension_summary.sql` - ✅

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## 📝 Git Commits

Recent commits:
- `517a035` - feat: add special items RM support (zippers, buttons, etc.)
- `953ff05` - docs: add special items RM support documentation
- `5c26da7` - docs: add critical implementation notes - RM dimension tracking is mandatory

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## 🎯 Next Milestone

**Current Focus**: Complete special items RM support across all modules

**Priority Tasks**:
1. ✅ Product model - DONE
2. ✅ GRN processing - DONE
3. ⏳ BOM service updates - NEXT
4. ⏳ Production service updates
5. ⏳ Testing

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## 📚 Documentation

- **Design**: `DIMENSION_BASED_INVENTORY_DESIGN.md`
- **Requirements**: `todos/specs/dimension-based-inventory/requirements.md`
- **Tasks**: `todos/specs/dimension-based-inventory/tasks.md`
- **Design (detailed)**: `todos/specs/dimension-based-inventory/design.md`

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**Last Updated**: $(date)
**Status**: Special Items RM Support - In Progress (60% complete)
