# RSX Architecture Documentation

## Overview

RSX (RSpade eXtension) is a path-agnostic development framework built on top of Laravel that provides a modern, attribute-driven development experience. Developers can organize their code freely without worrying about file paths, imports, or directory structures.

## Core Philosophy

1. **Path Independence**: Files reference each other by class name, not file path
2. **Attribute-Driven**: PHP 8 attributes for routing, caching, middleware, and more
3. **Automatic Discovery**: All files are automatically indexed and made available
4. **Zero Configuration**: Works out of the box with sensible defaults
5. **Performance First**: Fast in development, optimized in production
6. **Opinionated Design**: Strong conventions for consistent development

## Three-Tier Architecture

RSX follows a clear three-tier directory structure philosophy:

### 1. Framework Layer: `/app/RSpade/`

This directory contains framework and library code that should NOT be modified by users.

**Purpose**: Core RSX functionality that powers the path-agnostic environment

**Key Components**:

#### Core System (`/app/RSpade/Core/`)
- **Manifest.php** - File indexing and discovery system
  - Scans directories for PHP classes
  - Builds comprehensive class map
  - Handles file-based and memory caching
  - Supports incremental rebuilds
  
- **Autoloader.php** - SPL autoloader for RSX classes
  - Integrates with Manifest for class loading
  - Supports path-agnostic class resolution
  - Falls back to PSR-4 for non-RSX classes

#### Dispatch System (`/app/RSpade/Core/Dispatch/`)
- **Dispatcher.php** - Central request dispatcher
  - Routes HTTP requests to appropriate handlers
  - Processes attributes before and after execution
  - Handles static assets, API requests, and controllers
  - Integrates with Laravel's request/response cycle

- **RouteResolver.php** - URL pattern matching
  - Converts route patterns to regex
  - Extracts parameters from URLs
  - Handles optional parameters and wildcards
  - Sorts routes by specificity

- **AttributeProcessor.php** - Attribute handling
  - Chain of Responsibility pattern
  - Processes attributes before/after method execution
  - Supports custom processors
  - Handles caching, rate limiting, CORS, etc.

- **ApiHandler.php** - API request processing
  - JSON-only responses (opinionated design)
  - Internal API execution without HTTP overhead
  - Session stack management for nested calls
  - Pagination, filtering, and sorting support

- **AssetHandler.php** - Static file serving
  - Serves files from `/rsx/*/public/` directories
  - Proper MIME type detection
  - Cache headers for performance
  - Security checks for path traversal

#### Attributes (`/app/RSpade/Core/Attributes/`)
- **Route.php** - HTTP route definition
  ```php
  #[Route('/api/users', methods: ['GET', 'POST'])]
  ```

- **Cache.php** - Response caching
  ```php
  #[Cache(ttl: 3600, key: 'user-list', tags: ['users'])]
  ```

- **RateLimit.php** - Request throttling
  ```php
  #[RateLimit(max_attempts: 60, decay_minutes: 1)]
  ```

- **Middleware.php** - Middleware application
  ```php
  #[Middleware(['auth', 'verified'])]
  ```

- **Cors.php** - Cross-Origin Resource Sharing
  ```php
  #[Cors(allowed_origins: ['https://app.example.com'])]
  ```

- **ApiVersion.php** - API versioning
  ```php
  #[ApiVersion('v2', deprecated: false)]
  ```

#### Processors (`/app/RSpade/Core/Processors/`)
- **CacheProcessor.php** - Handles Cache attributes
- **RateLimitProcessor.php** - Handles RateLimit attributes
- **MiddlewareProcessor.php** - Handles Middleware attributes
- **CorsProcessor.php** - Handles CORS preflight and headers

#### Base Classes (`/app/RSpade/Core/Base/`)
- **Rsx_Controller** - Base controller with dispatch integration
- **Rsx_Model_Abstract** - Base model with manifest awareness
- **Rsx_Api** - Base API controller with JSON responses
- **Rsx_Service** - Base service class
- **Rsx_Component** - Base UI component class

### 2. Application Layer: `/app/*` (other directories)

Standard Laravel application directories that users can modify.

**Purpose**: Traditional Laravel application code

**Examples**:
- `/app/Http/Controllers/` - Laravel controllers
- `/app/Models/` - Eloquent models
- `/app/Console/Commands/` - Artisan commands
- `/app/Services/` - Business logic services

### 3. User Development Space: `/rsx/`

Path-agnostic RSX development directory.

**Purpose**: User-created RSX components that are automatically discovered

**Convention-based Structure** (optional):
```
/rsx/
├── controllers/      # HTTP controllers
├── api/             # API endpoints
├── models/          # Data models
├── services/        # Business logic
├── components/      # UI components
├── views/           # Blade templates
├── js/              # JavaScript modules
├── styles/          # SCSS/CSS files
└── */public/        # Public assets (served directly)
```

## Request Flow

### 1. HTTP Request Arrives
```
Browser/Client → Laravel → RSX Dispatcher
```

### 2. Dispatcher Processing
```
Dispatcher → AssetHandler (if static file)
          → RouteResolver → Find matching route
          → AttributeProcessor → Process before attributes
          → HandlerFactory → Create handler instance
          → Execute handler method
          → AttributeProcessor → Process after attributes
          → Response
```

### 3. Attribute Processing Pipeline
```
Request → RateLimitProcessor → MiddlewareProcessor → CacheProcessor → Handler
       ← CorsProcessor ← CacheProcessor ← Response
```

## Key Features

### 1. Attribute-Driven Development

```php
namespace Rsx\Api;

use App\RSpade\Core\Base\Rsx_Api;
use App\RSpade\Core\Attributes\{Route, Cache, RateLimit, Cors};

#[Cors(allowed_origins: ['https://app.example.com'])]
class UserApi extends Rsx_Api
{
    #[Route('/api/users', methods: ['GET'])]
    #[Cache(ttl: 300, tags: ['users'])]
    #[RateLimit(max_attempts: 60)]
    public static function list_users($params)
    {
        return ['users' => User::all()];
    }
    
    #[Route('/api/users/:id', methods: ['GET'])]
    public static function get_user($params)
    {
        return User::find($params['id']);
    }
}
```

### 2. Path-Agnostic Class Loading

```php
// No need for use statements or full paths
class OrderController extends Rsx_Controller
{
    public function process_order($params)
    {
        // Classes are auto-discovered
        $order = new OrderModel();
        $payment = new PaymentService();
        
        return $payment->process($order);
    }
}
```

### 3. Internal API Execution (Future)

```php
// Call API endpoints internally without HTTP overhead
$result = API::execute('UserApi.get_profile', ['user_id' => 123]);

// Nested calls maintain separate session contexts
// UserApi → OrderApi → PaymentApi (each with own session)
```

### 4. Smart Asset Serving

Any file in `/rsx/*/public/` is automatically served:
- `/rsx/shop/public/logo.png` → `/rsx/shop/public/logo.png`
- Proper MIME types and cache headers
- No configuration needed

## Manifest System

The Manifest is the heart of RSX's path-agnostic architecture:

### Building
```bash
php artisan rsx:manifest:build     # Full rebuild
php artisan rsx:manifest:rebuild   # Force rebuild
php artisan rsx:manifest:clear     # Clear cache
```

### Manifest Structure
```json
{
    "classes": {
        "UserController": {
            "file": "/rsx/controllers/UserController.php",
            "type": "controller",
            "namespace": "Rsx\\Controllers"
        }
    },
    "routes": {
        "controllers": {
            "/users": {
                "GET": {
                    "class": "UserController",
                    "method": "index"
                }
            }
        }
    },
    "metadata": {
        "build_time": "2024-01-01 12:00:00",
        "file_count": 150,
        "route_count": 45
    }
}
```

## Performance Optimizations

### 1. Two-Level Caching
- **Memory Cache**: In-process array cache for current request
- **File Cache**: Persistent cache across requests
- **Automatic invalidation**: Based on file modification times

### 2. Route Compilation
```bash
php artisan rsx:routes:cache    # Compile routes for production
php artisan rsx:routes:clear   # Clear route cache
```

### 3. Lazy Loading
- Classes are only loaded when actually used
- Manifest is loaded once per request
- Attributes are extracted on-demand

## Testing Framework

RSX includes comprehensive testing infrastructure:

### Test Organization
```
/tests/RsxFramework/
├── Unit/           # Isolated class tests
├── Integration/    # Component interaction tests
├── EndToEnd/       # Complete flow tests
└── Commands/       # Artisan command tests
```

### Running Tests
```bash
php artisan test                    # All tests (color-free output)
php artisan test tests/RsxFramework # Framework tests only
php artisan test --coverage         # With coverage report
```

## Artisan Commands

### Manifest Management
```bash
php artisan rsx:manifest:build      # Build manifest
php artisan rsx:manifest:show       # Display manifest
php artisan rsx:manifest:stats      # Show statistics
php artisan rsx:manifest:watch      # Watch for changes
```

### Route Management
```bash
php artisan rsx:routes              # List all routes
php artisan rsx:routes:list         # Detailed route list
php artisan rsx:routes:cache        # Cache routes
php artisan rsx:routes:clear        # Clear route cache
```

### Development Tools
```bash
php artisan rsx:make:controller     # Create RSX controller
php artisan rsx:make:api           # Create API endpoint
php artisan rsx:make:model         # Create RSX model
```

## Configuration

### Environment Variables
```env
RSX_CACHE_ENABLED=true          # Enable manifest caching
RSX_CACHE_TTL=3600             # Cache TTL in seconds
RSX_AUTO_BUILD=true            # Auto-build manifest if missing
RSX_WATCH_ENABLED=false        # Enable file watching
```

### Configuration File
```php
// config/rsx.php
return [
    'manifest' => [
        'cache_enabled' => env('RSX_CACHE_ENABLED', true),
        'cache_ttl' => env('RSX_CACHE_TTL', 3600),
    ],
    'dispatch' => [
        'api_json_only' => true,  # APIs always return JSON
        'asset_cache_ttl' => 86400,
    ],
];
```

## Best Practices

### 1. Use Attributes Wisely
- Apply at class level for all methods
- Apply at method level for specific routes
- Combine multiple attributes for complex behavior

### 2. Organize by Feature
```
/rsx/shop/
├── controllers/
├── models/
├── services/
└── public/

/rsx/blog/
├── controllers/
├── models/
└── public/
```

### 3. Keep Controllers Thin
- Business logic in services
- Data access in models
- Controllers for request/response only

### 4. Leverage Caching
- Use Cache attribute for expensive operations
- Set appropriate TTL values
- Use cache tags for invalidation

### 5. Rate Limiting
- Always add rate limiting to public APIs
- Use different limits for authenticated vs anonymous
- Consider using custom key resolvers

## Migration from Laravel

### Step 1: Move Controllers
```bash
# Move Laravel controller to RSX
mv app/Http/Controllers/UserController.php rsx/controllers/
```

### Step 2: Add Attributes
```php
// Before (Laravel)
Route::get('/users', [UserController::class, 'index']);

// After (RSX)
#[Route('/users', methods: ['GET'])]
public function index($params) { }
```

### Step 3: Update References
```php
// Before
use App\Http\Controllers\UserController;

// After - no import needed!
$controller = new UserController();
```

## Troubleshooting

### Manifest Not Building
```bash
php artisan rsx:manifest:rebuild --verbose
```

### Routes Not Found
```bash
php artisan rsx:routes:list | grep "your-route"
```

### Class Not Loading
```bash
php artisan rsx:manifest:show | grep "YourClass"
```

### Cache Issues
```bash
php artisan rsx:manifest:clear
php artisan rsx:routes:clear
php artisan cache:clear
```

## Future Roadmap

1. **GraphQL Support** - Automatic GraphQL schema from attributes
2. **WebSocket Integration** - Real-time features with attributes
3. **Module System** - Package RSX modules for reuse
4. **Hot Reload** - Automatic reload during development
5. **IDE Integration** - Full IntelliSense for RSX classes
6. **Distributed Caching** - Redis/Memcached for manifest
7. **API Documentation** - Auto-generate from attributes
8. **Database Migrations** - Attribute-based migrations