# User Management & Permissions System - Implementation Summary

## ✅ What Was Implemented

### 1. Settings Page (Admin Only)
**Location**: `client/settings.php`

**Features**:
- Two-tab interface: User Management & Module Access
- Add new users with role and permission selection
- Edit existing users (name, email, role, status, permissions)
- Delete users (with self-protection)
- View all users in the same PSP
- Professional UI matching My Care branding

### 2. Permission-Based Navigation
**Location**: `client/header.php`

**Features**:
- Dynamic menu that shows/hides based on user permissions
- Admin users see all modules + Settings
- Regular users only see modules they have access to
- Overview (Dashboard) always visible to everyone

### 3. Access Control Functions
**Location**: `client/function.php`

**Functions Added**:
```php
hasPermission($pdo, $clientId, 'module_name')
requirePermission($pdo, $clientId, 'module_name')
```

### 4. Module Protection
**Protected Pages**:
- ✅ `client/de/index.php` - Enrollment (requires 'enrollment' permission)
- ✅ `client/pharmacy/index.php` - Patient Calls (requires 'calls' permission)
- ✅ `client/reimbursement/index.php` - Reimbursement (requires 'reimbursement' permission)
- ✅ `client/tasks.php` - Tasks (requires 'tasks' permission)
- ✅ `client/files.php` - Documents (requires 'documents' permission)
- ✅ `client/reports.php` - Reports (requires 'reports' permission)

### 5. Database Structure
**Updated**: `client/database_setup.sql`

**New Columns in tblclient**:
- `userRole` - enum('admin', 'user')
- `permissions` - TEXT (JSON format)

**Migration Script**: `client/database_migration_permissions.sql`

### 6. User Experience
- Access denied alerts on dashboard
- Cannot delete own account
- PSP-based user isolation
- Active/Inactive status toggle
- Professional modal dialogs for add/edit

## 📋 Available Permissions

| Permission | Module | Description |
|------------|--------|-------------|
| `enrollment` | Enrollment | Patient data entry and management |
| `calls` | Patient Calls | Pharmacy call tracking |
| `reimbursement` | Reimbursement | Reimbursement management |
| `tasks` | Tasks | Task management |
| `documents` | Documents | File management |
| `reports` | Reports | Reporting and analytics |

## 🔐 Security Features

1. **Server-Side Validation**: All checks happen on the server
2. **Admin Override**: Admins automatically have all permissions
3. **PSP Isolation**: Users only see/manage users in their PSP
4. **Self-Protection**: Cannot delete your own account
5. **Direct URL Protection**: Accessing restricted URLs redirects to dashboard

## 🎨 UI Components

### Settings Page Tabs
```
┌─────────────────────────────────────────┐
│ [User Management] [Module Access]       │
├─────────────────────────────────────────┤
│                                          │
│  Users Table:                            │
│  - Name, Email, Role, Status, Created   │
│  - Edit & Delete buttons                │
│  - Add User button                       │
│                                          │
└─────────────────────────────────────────┘
```

### Add/Edit User Modal
```
┌─────────────────────────────────────────┐
│  Add New User                        [X] │
├─────────────────────────────────────────┤
│  Name: [________________]                │
│  Email: [________________]               │
│  Role: [Admin ▼]                         │
│                                          │
│  Module Permissions:                     │
│  ☑ Enrollment      ☑ Patient Calls      │
│  ☑ Reimbursement   ☐ Tasks              │
│  ☐ Documents       ☐ Reports             │
│                                          │
│  [Add User] [Cancel]                     │
└─────────────────────────────────────────┘
```

### Navigation Menu (Permission-Based)
```
Admin sees:
[Overview] [Enrollment] [Patient Calls] [Reimbursement] [Tasks] [Documents] [Reports] [Settings]

User with limited permissions sees:
[Overview] [Enrollment] [Patient Calls]
```

## 📝 Usage Example

### Scenario: Add a data entry specialist

1. Admin logs in
2. Clicks "Settings" in navigation
3. Clicks "Add User"
4. Fills in:
   - Name: "Jane Smith"
   - Email: "jane@example.com"
   - Role: "User"
   - Permissions: ✅ Enrollment only
5. Clicks "Add User"
6. Jane receives login credentials
7. Jane logs in and only sees: Overview + Enrollment

## 🚀 Next Steps

To use this system:

1. **For new installations**: Run `database_setup.sql`
2. **For existing installations**: Run `database_migration_permissions.sql`
3. Login as admin
4. Go to Settings
5. Add users and assign permissions
6. Users login and see only their allowed modules

## 📄 Documentation Files

- `PERMISSIONS_SETUP_GUIDE.md` - Detailed setup and usage guide
- `PERMISSIONS_SUMMARY.md` - This file (quick reference)
- `database_migration_permissions.sql` - Migration script for existing installations
- `database_setup.sql` - Updated with permission columns

## ✨ Key Benefits

1. **Granular Control**: Assign specific modules to each user
2. **Security**: Server-side permission checks prevent unauthorized access
3. **Flexibility**: Easy to add/remove permissions as needs change
4. **User-Friendly**: Clean UI for managing users
5. **Scalable**: Supports multiple users per PSP
6. **Professional**: Matches My Care branding and design standards
