🚀 Didi - Advanced Employee Management System Frontend

A comprehensive React TypeScript frontend for managing employees, departments, roles, and permissions with advanced role-based access control.

📋 Overview

Didi is a feature-rich Employee Management System frontend built with React, TypeScript, and Tailwind CSS. It provides complete role-based access control with three user types (ADMIN, MANAGER, USER) and integrates seamlessly with a Spring Boot backend using comprehensive REST APIs.

✨ Advanced Features

🔐 Authentication & Authorization

• JWT-based authentication with secure token management
• Role-based access control (ADMIN, MANAGER, USER)
• Secure login and registration with validation
• Password change functionality
• Automatic token refresh handling
• Server-side logout integration

👥 Complete Employee Management

• ADMIN: Full CRUD operations on employees
• MANAGER: Read-only access to all employees
• USER: View and edit own profile only
• Advanced employee search and filtering
• Pagination with customizable page sizes
• Department-based filtering
• Detailed employee profiles with comprehensive information
• Employee creation and editing forms with validation
• Salary management and hire date tracking

🏢 Department Management

• ADMIN: Full CRUD operations on departments
• MANAGER: Read-only access to departments
• Department listing with inline editing
• Department creation with code validation
• Real-time validation and error handling

👤 Advanced Profile Management

• Comprehensive user profile editing
• Employee information integration
• Password change functionality
• Role-specific field access
• Real-time form validation

🔧 Admin Panel (ADMIN Only)

• Role Management: Create, edit, delete system roles
• Permission Management: Manage fine-grained permissions
• Role-Permission Assignment: Flexible permission assignment
• Advanced admin controls
• System administration tools

📊 Enhanced Role-Based Dashboards

• Admin Dashboard: System statistics, recent hires, employee counts, admin tools
• Manager Dashboard: Team overview, department statistics, employee metrics
• User Dashboard: Personal profile, quick actions, employee information

🛠️ Advanced Technology Stack

• Frontend: React 19.1.0 with TypeScript
• Routing: React Router DOM 7.6.3 with protected routes
• Styling: Tailwind CSS 3.3.5 with custom components
• Forms: React Hook Form 7.53.0 with advanced validation
• HTTP Client: Axios 1.10.0 with interceptors
• Notifications: React Hot Toast 2.4.1
• Icons: Heroicons React 2.1.1
• UI Components: Headless UI 2.1.0
• State Management: React Context with role-based permissions

🏗️ Advanced Project Structure

src/
├── components/
│   ├── auth/              # Authentication components
│   │   ├── LoginForm.tsx
│   │   └── SignupForm.tsx
│   ├── common/            # Shared components
│   │   ├── ProtectedRoute.tsx
│   │   └── ToastProvider.tsx
│   └── layout/            # Layout components
│       ├── DashboardLayout.tsx
│       └── Sidebar.tsx
├── context/
│   └── AuthContext.tsx    # Advanced authentication context
├── pages/                 # Complete page components
│   ├── AdminPanel.tsx     # Role & permission management
│   ├── DashboardPage.tsx  # Role-based dashboards
│   ├── DepartmentListPage.tsx
│   ├── EmployeeDetailsPage.tsx
│   ├── EmployeeFormPage.tsx
│   ├── EmployeeListPage.tsx
│   ├── LoginPage.tsx
│   ├── ProfilePage.tsx
│   └── SignupPage.tsx
├── services/              # Complete API services
│   ├── api.ts            # Advanced Axios configuration
│   ├── auth.ts           # Authentication services
│   ├── departmentService.ts
│   ├── employeeService.ts
│   ├── permissionService.ts
│   ├── roleService.ts
│   └── userProfileService.ts
├── types/                 # Comprehensive TypeScript definitions
│   └── index.ts
└── App.tsx               # Advanced routing with role protection

🚀 Getting Started

Prerequisites

• Node.js 16.x or higher
• npm or yarn
• Spring Boot backend running on http://localhost:9090

Installation

1. Clone the repository

git clone <repository-url>
cd didi

2. Install dependencies

npm install

3. Configure environment variables (optional) Create a .env file in the root directory:

REACT_APP_API_BASE_URL=http://localhost:9090
REACT_APP_JWT_TOKEN_KEY=employee_management_token
REACT_APP_REFRESH_TOKEN_KEY=employee_management_refresh_token

4. Start the development server

npm start

The application will open at http://localhost:3000.

🔑 Default Test Credentials

Use these credentials to test different user roles:

Role	Username	Password	Access Level
Admin	admin	admin123	Full system access + Admin Panel
Manager	manager	manager123	Read-only access to employees/departments
User	user	user123	Personal profile access only

🎯 Advanced User Roles & Permissions

👑 ADMIN (Full System Access)

• Employee Management: Create, read, update, delete all employees
• Department Management: Full CRUD operations on departments
• Role Management: Create and manage system roles
• Permission Management: Assign and manage permissions
• Admin Panel: Access to advanced administration tools
• System Statistics: View comprehensive system analytics
• All Navigation: Access to all application areas

👨‍💼 MANAGER (Read-Only Management)

• Employee Viewing: Read-only access to all employee profiles
• Department Viewing: Read-only access to all departments
• Team Statistics: Access to team and department analytics
• Limited Navigation: Employee and department sections only
• No CRUD Operations: Cannot create, edit, or delete records

👤 USER (Personal Access)

• Personal Profile: View and update own information
• Limited Editing: Can only edit phone number and basic profile
• Employee Info: View own employee record (if exists)
• Minimal Navigation: Dashboard and profile only
• No System Access: Cannot view other users or system data

📱 Complete Pages & Features

Authentication Pages

• Login Page: JWT authentication with comprehensive validation
• Signup Page: User registration with password requirements and validation

Dashboard Pages

• Admin Dashboard: System overview, employee metrics, recent hires, quick actions
• Manager Dashboard: Team statistics, department breakdown, employee summary
• User Dashboard: Personal information, profile summary, quick actions

Employee Management (Full CRUD)

• Employee List: Advanced pagination, search, department filtering
• Employee Details: Comprehensive employee information display
• Employee Form: Create/edit forms with extensive validation
• Profile Management: Personal profile editing with role-based permissions

Department Management

• Department List: Inline editing, modal-based CRUD operations
• Department Forms: Creation and editing with code validation
• Department Assignment: Employee-department relationship management

Advanced Administration (ADMIN Only)

• Role Management: Create, edit, delete system roles
• Permission Assignment: Flexible permission-role mapping
• System Administration: Advanced admin controls
• User Role Assignment: Manage user role assignments

🔧 Complete API Integration

The frontend integrates with the Spring Boot backend using these endpoint modules:

Authentication Module (/auth)

POST /auth/login           // User login with JWT
POST /auth/register        // User registration
POST /auth/logout          // Server-side logout
POST /auth/refresh-token   // Token refresh
POST /auth/change-password // Password change

Employee Management (/api/v1/employees)

GET    /api/v1/employees                    // Paginated employee list
GET    /api/v1/employees/search             // Employee search
GET    /api/v1/employees/{id}               // Employee details
GET    /api/v1/employees/profile            // Current user profile
GET    /api/v1/employees/department/{id}    // Employees by department
POST   /api/v1/employees                    // Create employee (ADMIN)
PUT    /api/v1/employees/{id}               // Update employee (ADMIN)
PUT    /api/v1/employees/profile            // Update own profile
DELETE /api/v1/employees/{id}               // Delete employee (ADMIN)

Department Management (/api/v1/departments)

GET    /api/v1/departments     // All departments
GET    /api/v1/departments/{id} // Department details
POST   /api/v1/departments     // Create department (ADMIN)
PUT    /api/v1/departments/{id} // Update department (ADMIN)
DELETE /api/v1/departments/{id} // Delete department (ADMIN)

User Profile Management (/users)

GET /users/me    // Current user profile
PUT /users/me    // Update user profile

Role Management (/api/roles) - ADMIN Only

GET    /api/roles     // All roles
GET    /api/roles/{id} // Role details
POST   /api/roles     // Create role
PUT    /api/roles/{id} // Update role
DELETE /api/roles/{id} // Delete role

Permission Management (/api/permissions) - ADMIN Only

GET    /api/permissions     // All permissions
GET    /api/permissions/{id} // Permission details
POST   /api/permissions     // Create permission
PUT    /api/permissions/{id} // Update permission
DELETE /api/permissions/{id} // Delete permission

🎨 Advanced UI/UX Features

• Responsive Design: Mobile-first design with tablet and desktop optimization
• Role-based Navigation: Dynamic sidebar and menu based on user permissions
• Advanced Loading States: Skeleton screens and progress indicators
• Comprehensive Error Handling: Toast notifications and error boundaries
• Real-time Form Validation: Instant feedback with detailed error messages
• Consistent Design System: Tailwind CSS with custom component library
• Accessibility: WCAG 2.1 compliant interface
• Performance Optimized: Code splitting and lazy loading

🔄 Advanced State Management

• Authentication State: Global auth context with role checking
• Permission System: Granular permission checking utilities
• Token Management: Automatic JWT handling with refresh logic
• Error Handling: Centralized error management with user feedback
• Form State: Advanced form management with validation
• API Caching: Intelligent caching for improved performance

📊 Performance & Security Features

• Code Splitting: Optimized bundle sizes with lazy loading
• JWT Security: Secure token storage and automatic refresh
• API Interceptors: Request/response interceptors for error handling
• CSRF Protection: Cross-site request forgery protection
• Input Validation: Client and server-side validation
• Error Boundaries: Graceful error handling and recovery

🧪 Testing & Development

The project includes comprehensive testing setup:

• React Testing Library: Component testing
• Jest: Unit testing framework
• TypeScript: Type safety and IntelliSense
• ESLint: Code quality and consistency

Run tests:

npm test

Build for production:

npm run build

🔍 Advanced Troubleshooting

Common Issues & Solutions

1. API Connection Issues

   • Ensure backend is running on http://localhost:9090
   • Check CORS configuration on backend
   • Verify API endpoints match documentation
   • Check network tab for failed requests

2. Authentication Problems

   • Clear localStorage: localStorage.clear()
   • Check JWT token expiration
   • Verify user credentials and roles
   • Check browser console for auth errors

3. Permission Issues

   • Verify user roles in JWT token
   • Check role-based route protection
   • Ensure proper permission assignment
   • Review admin panel configuration

4. Build Errors

   • Clear node_modules: rm -rf node_modules && npm install
   • Check TypeScript configuration
   • Verify all imports are correct
   • Update dependencies if needed

📈 Future Enhancements

Planned Advanced Features

• Real-time notifications with WebSocket
• Advanced analytics and reporting
• Bulk operations for employee management
• CSV/Excel import/export functionality
• Advanced search with filters
• Activity logging and audit trails
• Multi-tenant support
• Advanced dashboard customization
• Email notification system
• Mobile app (React Native)

Technical Improvements

• PWA capabilities with offline support
• Advanced caching strategies
• Performance monitoring
• E2E testing with Cypress
• Internationalization (i18n)
• Dark mode theme
• Advanced accessibility features
• SEO optimization

📄 API Documentation

For complete API documentation, see API_ENDPOINTS_REFERENCE.md which includes:

• All endpoint specifications
• Request/response examples
• Error handling guidelines
• Authentication requirements
• Role-based access details

🤝 Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📞 Support

For support and questions:

• Create an issue in the repository
• Check the API documentation
• Review the troubleshooting guide
• Contact the development team

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Built with ❤️ using React, TypeScript, and Tailwind CSS

A complete, production-ready Employee Management System with advanced role-based access control.