# PRODUCTION.md

## Project Name

Modern Point of Sales (POS) & Inventory Management System

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# Project Goal

Build a scalable, production-ready Point of Sales (POS) and Inventory Management System using PHP and MySQL with a modern responsive UI.

The system must be fast, secure, modular, maintainable, and suitable for real business operations including retail stores, minimarkets, warehouses, and multi-branch environments.

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# Tech Stack

## Frontend

* HTML5
* CSS3
* Bootstrap 5
* JavaScript 
* AJAX
* DataTables

## Backend

* PHP 8+
* MVC Architecture
* REST-ready structure
* PDO Prepared Statements

## Database

* MySQL

## Environment

* XAMPP / Apache
* Production Linux Server Ready

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# Core Modules

## 1. Authentication & Security

* Login/logout
* Session management
* Force logout
* Idle timeout
* Role-based access control
* Password hashing
* Activity logging
* CSRF protection
* SQL injection prevention

Roles:

* Super Admin: Full access to all modules, system settings, and user management.
* Admin: Access to all modules, except sensitive system configurations and permanent record deletion.
* Manager: Access to Dashboard, Inventory (view/edit), Purchasing (view/approve), and Sales Reports.
* Cashier: Access to POS, Daily Cashier Report, and own transaction history only. No access to backoffice settings.
* Warehouse Staff: Access to Inventory (stock update, goods receipt, stock opname). No access to sales or financials.

### Module-Level Granular Permissions:

**1. Dashboard:**
* View operational metrics (stock alerts, pending PO): Admin, Manager, Warehouse Staff
* View financial metrics (revenue charts, profit): Super Admin, Admin, Manager

**2. POS (Point of Sales):**
* Process sales & print receipts: Super Admin, Cashier
* Void/Delete transaction: Super Admin, Admin, Manager
* Apply custom discounts/override prices: Super Admin, Admin, Manager

**3. Inventory Management:**
* View products & stock levels: All roles
* Add/Edit product master data: Super Admin, Admin, Manager
* Perform stock adjustment & stock opname: Super Admin, Admin, Warehouse Staff
* View product cost price (COGS): Super Admin, Admin, Manager

**4. Purchasing:**
* Create Purchase Orders (PO): Admin, Manager
* Approve PO: Super Admin, Admin, Manager
* Process Goods Receipt: Admin, Warehouse Staff

**5. Sales & Financial Reports:**
* View End-of-Day shift report: Cashier (own only), Manager, Admin
* View Profit/Loss & Analytics: Super Admin, Admin, Manager
* View Inventory Valuation: Super Admin, Admin, Manager

**6. Settings & Users:**
* Manage Users & Roles: Super Admin
* System Configuration: Super Admin

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# 2. Dashboard

Display:

* Daily sales
* Monthly sales
* Top products
* Low stock alerts
* Pending purchase orders
* Revenue chart
* Transaction statistics

Dashboard must load fast using AJAX.

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# 3. Point of Sales (POS)

Features:

* Barcode scanner support
* Product search
* Cart system
* Multi-payment support
* Discount support
* Tax calculation
* Receipt printing
* Hold/resume transaction
* Reprint receipt
* Return/refund system
* Keyboard shortcut optimized

Requirements:

* Fast transaction processing
* Real-time stock deduction
* Transaction rollback protection

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# 4. Inventory Management

Features:

* Product master
* Categories
* Brands
* Unit management
* Multi warehouse
* Stock adjustment
* Stock transfer
* Stock opname
* Inventory history log
* Batch & expiry support (optional)

## Inventory Management
- Product Master Data (SKU, Barcode, Name, Category, Unit, Images, Prices)
- Multi-Warehouse Architecture (Track stock independently across multiple locations/warehouses)
- Stock Adjustments & Transfers between warehouses
- Low Stock Alerts

Inventory must update automatically after:

* Sales
* Purchase
* Returns
* Adjustments

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# 5. Purchasing Module

Features:

* Supplier management
* Purchase orders
* Goods receipt
* Purchase return
* Outstanding PO tracking

## Purchasing & Goods Receipt
- Supplier Management
- Purchase Order Creation & Approval Flow
- Goods Receipt (GR) Module: Receive PO items into specific warehouses, dynamically updating `product_stocks`.ds receipt
* Purchase return
* Outstanding PO tracking

Workflow:
PO → Approval → Goods Receipt → Inventory Update

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# 6. Sales Management

Features:

* Invoice management
* Customer database
* Member points
* Customer history
* Sales return
* Sales analytics

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# 7. Financial Reports

Reports:

* Daily sales report
* Monthly sales report
* Profit/loss
* Inventory valuation
* Cashier closing
* Product movement
* Best-selling items

Export:

* Excel
* PDF
* Print-friendly format

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# Database Standards

Requirements:

* Normalized database
* Proper indexing
* Foreign key constraints
* Soft delete support
* Audit columns

Standard Columns:

* created_at
* updated_at
* deleted_at
* created_by
* updated_by

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# Coding Standards

## PHP

* Use MVC structure
* Reusable helper functions
* Use service/repository pattern when needed
* No duplicated code
* Use environment configuration

## SQL

* PDO prepared statements only
* No inline SQL concatenation
* Optimize joins
* Proper indexing

## JavaScript

* Modular scripts
* Avoid inline JS
* Use AJAX for CRUD operations

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# UI/UX Requirements

Style:

* Modern admin dashboard
* Clean layout
* Minimalist design
* Dark/light mode ready
* Responsive design

Components:

* Sidebar navigation
* Top navbar
* Cards
* Modals
* Toast notifications
* Loading indicators

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# Folder Structure

/app
/controllers
/models
/views
/services
/helpers

/public
/assets
/css
/js
/images

/config

/database
/migrations
/seeds

/routes

/storage
/logs
/uploads

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# Performance Requirements

* Fast page load
* Optimized SQL queries
* Lazy loading when necessary
* Pagination for large data
* Cache configuration ready

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# Security Requirements

Mandatory:

* Password hashing
* Session regeneration
* Input validation
* Output escaping
* CSRF protection
* SQL injection prevention
* XSS prevention

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# API Requirements

Prepare REST API structure for:

* Mobile app integration
* External systems
* Future integrations

API Standards:

* JSON response
* Token authentication
* Proper HTTP status codes

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# Production Readiness

The system must:

* Support thousands of transactions
* Be maintainable
* Be scalable
* Follow clean architecture
* Be deployment ready

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# Deliverables

Generate:

* Full source code
* Database schema
* SQL file
* ERD
* API structure
* UI design
* Sample data
* Installation guide
* Documentation

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# Additional Notes

Priority:

1. Stability
2. Security
3. Performance
4. Clean code
5. User experience

All modules must be interconnected and production-ready.