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azaharizaman/nexus-inventory
============================

Framework-agnostic inventory and stock management for Nexus ERP

v0.1.0-alpha1(2mo ago)023MITPHP ^8.3

Since May 5Compare

[ Source](https://github.com/azaharizaman/nexus-inventory)[ Packagist](https://packagist.org/packages/azaharizaman/nexus-inventory)[ RSS](/packages/azaharizaman-nexus-inventory/feed)WikiDiscussions Synced 3w ago

READMEChangelogDependencies (1)Versions (2)Used By (3)

Nexus\\Inventory
================

[](#nexusinventory)

[![PHP Version](https://camo.githubusercontent.com/ef0054230522e542bc1f908ac005c6c75888dea255bac910f9015e12095e31d7/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f7068702d253545382e332d626c7565)](https://www.php.net)[![License](https://camo.githubusercontent.com/f8df3091bbe1149f398a5369b2c39e896766f9f6efba3477c63e9b4aa940ef14/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6c6963656e73652d4d49542d677265656e)](LICENSE)![Status](https://camo.githubusercontent.com/d7a82d8a52dd62006b36d74273a0dc57b9c07fae375b5b7bf71967990f9381d4/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f7374617475732d50726f64756374696f6e25323052656164792d627269676874677265656e)![Implementation](https://camo.githubusercontent.com/208ae0869a6f9b28d9dbff421b4ac0143cc1abebd1d7d45bd896049221a9bdb6/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f696d706c656d656e746174696f6e2d3130302532352d73756363657373)![Test Coverage](https://camo.githubusercontent.com/7c2a9f747d45f7f67d8698b4815ebcddc4b6b3816de31c4e2e7f60d6d1bfaeef/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f636f7665726167652d302532352d637269746963616c)

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.

---

Table of Contents
-----------------

[](#table-of-contents)

- [Overview](#overview)
- [Features](#features)
- [Installation](#installation)
- [Quick Start](#quick-start)
- [Core Concepts](#core-concepts)
- [Available Interfaces](#available-interfaces)
- [Valuation Methods](#valuation-methods)
- [Event-Driven Architecture](#event-driven-architecture)
- [Progressive Disclosure](#progressive-disclosure)
- [Documentation](#documentation)
- [Testing](#testing)
- [Contributing](#contributing)
- [License](#license)

---

Overview
--------

[](#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
--------

[](#features)

### Stock Management

[](#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-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-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

[](#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

[](#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
------------

[](#installation)

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

### Requirements

[](#requirements)

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

---

Quick Start
-----------

[](#quick-start)

### Step 1: Implement Required Interfaces

[](#step-1-implement-required-interfaces)

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

### Step 2: Bind Interfaces in Your Container

[](#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

[](#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
-------------

[](#core-concepts)

### 1. Stock Levels

[](#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

[](#2-valuation-methods)

Three valuation engines available (see [Valuation Methods](#valuation-methods) below).

### 3. Lot Tracking (FEFO)

[](#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

[](#4-stock-reservations)

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

### 5. Stock Transfers

[](#5-stock-transfers)

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

---

Available Interfaces
--------------------

[](#available-interfaces)

### Core Service Managers

[](#core-service-managers)

#### `StockManagerInterface`

[](#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`

[](#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`

[](#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`

[](#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`

[](#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

[](#repository-interfaces)

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

### Configuration Interface

[](#configuration-interface)

- `ConfigurationInterface` - Product-specific and global configuration

### Event Publisher Interface

[](#event-publisher-interface)

- `EventPublisherInterface` - Domain event publishing

---

Valuation Methods
-----------------

[](#valuation-methods)

### FIFO (First-In-First-Out)

[](#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

[](#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

[](#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
-------------------------

[](#event-driven-architecture)

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

EventTriggered WhenGL Impact`StockReceivedEvent`Stock receivedDR Inventory Asset / CR GR-IR Clearing`StockIssuedEvent`Stock issuedDR COGS / CR Inventory Asset`StockAdjustedEvent`Stock adjustedDR/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
----------------------

[](#progressive-disclosure)

This package has **optional dependencies** for advanced features:

### Event Sourcing (Recommended for Large Enterprises)

[](#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

[](#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
-------------

[](#documentation)

### Getting Started

[](#getting-started)

- **[Getting Started Guide](docs/getting-started.md)** - Installation, configuration, first integration
- **[API Reference](docs/api-reference.md)** - Complete interface documentation
- **[Integration Guide](docs/integration-guide.md)** - Laravel, Symfony, Vanilla PHP examples

### Code Examples

[](#code-examples)

- **[Basic Usage](docs/examples/basic-usage.php)** - Stock receipt, issue, adjustment
- **[Advanced Usage](docs/examples/advanced-usage.php)** - Lot tracking, serial management, reservations, transfers

### Implementation Documentation

[](#implementation-documentation)

- **[IMPLEMENTATION\_SUMMARY.md](IMPLEMENTATION_SUMMARY.md)** - Implementation metrics and progress
- **[REQUIREMENTS.md](REQUIREMENTS.md)** - Complete requirements (92 requirements, 100% complete)
- **[VALUATION\_MATRIX.md](VALUATION_MATRIX.md)** - Package valuation ($163,385)

---

Testing
-------

[](#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](TEST_SUITE_SUMMARY.md) for complete test plan.

**Run Tests (after implementation):**

```
composer test
composer test:coverage
```

---

Contributing
------------

[](#contributing)

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

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

---

License
-------

[](#license)

MIT License. See [LICENSE](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)

###  Health Score

33

—

LowBetter than 72% of packages

Maintenance84

Actively maintained with recent releases

Popularity2

Limited adoption so far

Community7

Small or concentrated contributor base

Maturity35

Early-stage or recently created project

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Unknown

Total

1

Last Release

81d ago

### Community

Maintainers

![](https://avatars.githubusercontent.com/u/117408?v=4)[Azahari Zaman](/maintainers/azaharizaman)[@azaharizaman](https://github.com/azaharizaman)

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```
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