README

Framework-agnostic inventory and stock management package for Nexus ERP. Provides multi-valuation stock tracking (FIFO, Weighted Average, Standard Cost), lot tracking with FEFO enforcement, serial number management, stock reservations with auto-expiry, and inter-warehouse transfers.

Overview
Features
Installation
Quick Start
Core Concepts
Available Interfaces
Valuation Methods
Event-Driven Architecture
Progressive Disclosure
Documentation
Testing
Contributing
License

Overview

Nexus\Inventory is a pure PHP 8.3+ package providing comprehensive inventory and stock management capabilities. The package is framework-agnostic and integrates seamlessly with Laravel, Symfony, or vanilla PHP applications.

Key Capabilities:

Multi-Valuation Support: FIFO (O(n)), Weighted Average (O(1)), Standard Cost (O(1))
Lot Tracking: FEFO (First-Expiry-First-Out) enforcement for regulatory compliance (FDA, HACCP)
Serial Number Management: Tenant-scoped uniqueness with history tracking
Stock Reservations: Auto-expiry with configurable TTL (24-72 hours)
Inter-Warehouse Transfers: FSM-based workflow (pending → in_transit → completed)
Event-Driven GL Integration: 8 domain events for Finance package integration

Features

Stock Management

✅ Stock Receipt: Record incoming stock from purchase orders, production, transfers
✅ Stock Issue: Issue stock for sales orders, production consumption, scrap, adjustments
✅ Stock Adjustment: Cycle count, damage, found stock, obsolescence
✅ Stock Availability: Real-time calculation (quantity - reserved_quantity)

Lot Tracking (FEFO)

✅ Lot Creation: Lot number, quantity, expiry date, manufacture date
✅ FEFO Allocation: Automatic allocation from lots with earliest expiry date
✅ Expiry Detection: Configurable warning threshold (default: 30 days)
✅ Lot History: Track quantity received, quantity remaining, issue history

Serial Number Tracking

✅ Serial Registration: Register unique serial numbers per tenant
✅ Serial Uniqueness: Enforce tenant-scoped uniqueness (max 100 chars)
✅ Serial Issue Tracking: Track serial number issue/return history
✅ Serial Availability: Check if serial exists and is available

Stock Reservations

✅ Reservation Creation: Reserve stock for sales orders, work orders
✅ Configurable TTL: Auto-expire reservations after TTL (default: 48 hours)
✅ Auto-Expiry: Background job releases expired reservations
✅ Reservation Release: Manual release on fulfillment or cancellation

Inter-Warehouse Transfers

✅ Transfer Initiation: Create transfer order (pending state)
✅ Shipment Tracking: Record tracking number, shipment date
✅ FSM Workflow: pending → in_transit → completed/cancelled
✅ Stock Updates: Atomic stock decrement/increment on completion

Installation

composer require azaharizaman/nexus-inventory:"*@dev"

Requirements

PHP 8.3 or higher
azaharizaman/nexus-uom package (unit of measurement support)
PSR-3 logger implementation

Quick Start

Step 1: Implement Required Interfaces

// Implement StockLevelRepositoryInterface, ConfigurationInterface, EventPublisherInterface
// See docs/getting-started.md for complete examples

Step 2: Bind Interfaces in Your Container

// Laravel example
$this->app->singleton(StockManagerInterface::class, StockManager::class);
$this->app->singleton(StockLevelRepositoryInterface::class, DbStockLevelRepository::class);

Step 3: Use in Your Application

use Nexus\Inventory\Contracts\StockManagerInterface;
use Nexus\Inventory\Enums\IssueReason;
use Nexus\Currency\ValueObjects\Money;

public function __construct(
    private readonly StockManagerInterface $stockManager
) {}

// Receive stock from purchase order
public function receiveStock(): void
{
    $this->stockManager->receiveStock(
        tenantId: 'tenant-1',
        productId: 'product-123',
        warehouseId: 'warehouse-main',
        quantity: 100.0,
        unitCost: Money::of(25.50, 'MYR'),
        reference: 'PO-2024-001'
    );
    
    // StockReceivedEvent published → GL posts: DR Inventory Asset / CR GR-IR Clearing
}

// Issue stock for sales order
public function issueStock(): void
{
    $cogs = $this->stockManager->issueStock(
        tenantId: 'tenant-1',
        productId: 'product-123',
        warehouseId: 'warehouse-main',
        quantity: 30.0,
        reason: IssueReason::SALE,
        reference: 'SO-2024-005'
    );
    
    // StockIssuedEvent published → GL posts: DR COGS / CR Inventory Asset
    // $cogs contains calculated Cost of Goods Sold
}

Core Concepts

1. Stock Levels

Stock levels maintained per product per warehouse with three key metrics:

Quantity: Total physical stock
Reserved Quantity: Stock reserved for sales orders/work orders
Available Quantity: quantity - reserved_quantity

2. Valuation Methods

Three valuation engines available (see Valuation Methods below).

3. Lot Tracking (FEFO)

First-Expiry-First-Out (FEFO) enforcement ensures stock is issued from lots with earliest expiry date. Meets FDA and HACCP compliance requirements.

4. Stock Reservations

Temporary stock holds with configurable TTL. Auto-expire via background job if not fulfilled/cancelled within TTL.

5. Stock Transfers

Finite State Machine workflow: pending → in_transit → completed/cancelled

Available Interfaces

Core Service Managers

`StockManagerInterface`

Primary interface for stock movements (receive, issue, adjust).

Key Methods:

receiveStock() - Record incoming stock
issueStock() - Issue stock (returns COGS)
adjustStock() - Adjust stock levels (cycle count, damage, etc.)
getAvailableStock() - Get available stock quantity
getTotalStock() - Get total stock quantity

`LotManagerInterface`

Lot tracking and FEFO enforcement.

Key Methods:

createLot() - Create new lot with expiry date
allocateFromLots() - FEFO allocation algorithm
getAvailableLots() - Get lots ordered by expiry date
getExpiringLots() - Get lots expiring within threshold

`SerialNumberManagerInterface`

Serial number tracking and uniqueness enforcement.

Key Methods:

registerSerial() - Register unique serial number
issueSerial() - Mark serial as issued
isAvailable() - Check serial availability
getHistory() - Get serial history

`ReservationManagerInterface`

Stock reservations with TTL.

Key Methods:

reserve() - Create reservation with TTL
release() - Release reservation (fulfilled/cancelled)
expireReservations() - Expire stale reservations (background job)
getActiveReservations() - Query active reservations

`TransferManagerInterface`

Inter-warehouse transfers with FSM.

Key Methods:

initiateTransfer() - Create transfer order (pending)
startShipment() - Transition to in_transit
completeTransfer() - Complete transfer (update stock levels)
cancelTransfer() - Cancel transfer
getStatus() - Get current transfer status

Repository Interfaces

StockLevelRepositoryInterface - Stock level persistence
LotRepositoryInterface - Lot persistence
SerialNumberRepositoryInterface - Serial number persistence
ReservationRepositoryInterface - Reservation persistence
TransferRepositoryInterface - Transfer persistence

Configuration Interface

ConfigurationInterface - Product-specific and global configuration

Event Publisher Interface

EventPublisherInterface - Domain event publishing

Valuation Methods

FIFO (First-In-First-Out)

Performance: O(n) for stock issues
Best For: Perishables, pharmaceuticals, food & beverage
Accuracy: Matches physical flow of goods

Example:

use Nexus\Inventory\Core\Engine\FifoEngine;

$valuationEngine = new FifoEngine($stockLevelRepo);

Weighted Average

Performance: O(1) for both receipts and issues
Best For: Commodities, bulk materials, chemicals
Calculation: new_avg = ((old_qty × old_avg) + (new_qty × new_cost)) / (old_qty + new_qty)

Example:

use Nexus\Inventory\Core\Engine\WeightedAverageEngine;

$valuationEngine = new WeightedAverageEngine($stockLevelRepo);

Standard Cost

Performance: O(1) for both receipts and issues
Best For: Manufacturing, electronics, variance analysis
Behavior: Uses fixed standard cost, ignores actual receipt costs

Example:

use Nexus\Inventory\Core\Engine\StandardCostEngine;

$valuationEngine = new StandardCostEngine($stockLevelRepo, $config);

Event-Driven Architecture

The package publishes 8 domain events for integration with other packages:

Event	Triggered When	GL Impact
`StockReceivedEvent`	Stock received	DR Inventory Asset / CR GR-IR Clearing
`StockIssuedEvent`	Stock issued	DR COGS / CR Inventory Asset
`StockAdjustedEvent`	Stock adjusted	DR/CR Inventory Asset (variance)
`LotCreatedEvent`	Lot created	-
`LotAllocatedEvent`	FEFO allocation	-
`SerialRegisteredEvent`	Serial registered	-
`ReservationCreatedEvent`	Reservation created	-
`ReservationExpiredEvent`	Reservation expired	-

Example Event Listener (Laravel):

// Listen to StockIssuedEvent for GL integration
public function handleStockIssued(StockIssuedEvent $event): void
{
    $this->glManager->postJournalEntry(
        tenantId: $event->tenantId,
        entries: [
            ['account' => '5000', 'debit' => $event->cogs], // COGS
            ['account' => '1200', 'credit' => $event->cogs'], // Inventory Asset
        ]
    );
}

Progressive Disclosure

This package has optional dependencies for advanced features:

Event Sourcing (Recommended for Large Enterprises)

composer require azaharizaman/nexus-event-stream:"*@dev"

Benefits:

Full stock movement replay capability
Temporal queries ("What was stock level on 2024-10-15?")
Audit trail with complete history

Machine Learning Forecasting

composer require azaharizaman/nexus-machine-learning:"*@dev"

Benefits:

Demand forecasting
Stock optimization recommendations
Reorder point suggestions

Requirements: Minimum 90 days of historical stock movement data

Core inventory features work without these dependencies.

Documentation

Getting Started

Getting Started Guide - Installation, configuration, first integration
API Reference - Complete interface documentation
Integration Guide - Laravel, Symfony, Vanilla PHP examples

Code Examples

Basic Usage - Stock receipt, issue, adjustment
Advanced Usage - Lot tracking, serial management, reservations, transfers

Implementation Documentation

IMPLEMENTATION_SUMMARY.md - Implementation metrics and progress
REQUIREMENTS.md - Complete requirements (92 requirements, 100% complete)
VALUATION_MATRIX.md - Package valuation ($163,385)

Testing

Current Status: 🚨 0% coverage (CRITICAL PRIORITY)

Planned Tests: 85 tests (70 unit + 15 integration)

Test Breakdown:

StockManager: 12 tests
FIFO Engine: 8 tests
Weighted Average Engine: 6 tests
Standard Cost Engine: 7 tests
LotManager: 10 tests
SerialNumberManager: 8 tests
ReservationManager: 10 tests
TransferManager: 9 tests
Integration Tests: 15 tests

Target Coverage: 90%+

See: TEST_SUITE_SUMMARY.md for complete test plan.

Run Tests (after implementation):

composer test
composer test:coverage

Contributing

This package is part of the Nexus ERP monorepo. Contributions welcome following architectural guidelines:

Framework Agnosticism: No framework-specific dependencies in src/
Interface-Driven: All external dependencies via interfaces
Strict Types: declare(strict_types=1); in all files
PHP 8.3+: Use modern PHP features (enums, readonly, constructor promotion)
Test Coverage: Maintain 90%+ coverage

License

MIT License. See LICENSE file for details.

Package Maintainer: Nexus Architecture Team
Last Updated: November 25, 2024
Package Version: 1.0.0
Status: Production Ready (100% implementation, 0% test coverage - tests pending)

azaharizaman / nexus-inventory

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README

Table of Contents

Overview

Features

Stock Management

Lot Tracking (FEFO)

Serial Number Tracking

Stock Reservations

Inter-Warehouse Transfers

Installation

Requirements

Quick Start

Step 1: Implement Required Interfaces

Step 2: Bind Interfaces in Your Container

Step 3: Use in Your Application

Core Concepts

1. Stock Levels

2. Valuation Methods

3. Lot Tracking (FEFO)

4. Stock Reservations

5. Stock Transfers

Available Interfaces

Core Service Managers

StockManagerInterface

LotManagerInterface

SerialNumberManagerInterface

ReservationManagerInterface

TransferManagerInterface

Repository Interfaces

Configuration Interface

Event Publisher Interface

Valuation Methods

FIFO (First-In-First-Out)

Weighted Average

Standard Cost

Event-Driven Architecture

Progressive Disclosure

Event Sourcing (Recommended for Large Enterprises)

Machine Learning Forecasting

Documentation

Getting Started

Code Examples

Implementation Documentation

Testing

Contributing

License

`StockManagerInterface`

`LotManagerInterface`

`SerialNumberManagerInterface`

`ReservationManagerInterface`

`TransferManagerInterface`