# Project Body Documentation

## 1. System Architecture

### 1.1 Backend Architecture

-   MVC Architecture
-   Service Layer Pattern
-   Repository Pattern
-   Event-Driven Architecture

### 1.2 Frontend Architecture

-   Component-Based Structure
-   State Management
-   Responsive Design
-   Progressive Enhancement

## 2. Core Features Implementation

### 2.1 Authentication System

```php
// Implementation of multi-authentication
use Laravel\Sanctum\HasApiTokens;

class User extends Authenticatable
{
    use HasApiTokens, HasFactory, Notifiable;

    protected $fillable = [
        'name',
        'email',
        'password',
        'role'
    ];
}
```

### 2.2 Booking System

```php
class BookingService
{
    public function createBooking(array $data)
    {
        DB::transaction(function () use ($data) {
            // Create booking
            $booking = Booking::create([...]);

            // Update room status
            $room->update(['status' => 'occupied']);

            // Send notifications
            event(new BookingCreated($booking));
        });
    }
}
```

## 3. Database Structure

### 3.1 Core Tables

-   users
-   rooms
-   bookings
-   payments
-   services

### 3.2 Relationship Diagram

```
User 1:N Booking
Room 1:N Booking
Booking 1:1 Payment
Room 1:N Service
```

## 4. API Structure

### 4.1 RESTful Endpoints

```php
Route::prefix('api/v1')->group(function () {
    Route::apiResource('rooms', RoomController::class);
    Route::apiResource('bookings', BookingController::class);
    Route::apiResource('guests', GuestController::class);
});
```

### 4.2 Authentication Middleware

```php
Route::middleware(['auth:sanctum', 'verified'])->group(function () {
    // Protected routes
});
```

## 5. Security Implementation

### 5.1 Data Protection

```php
class BookingController extends Controller
{
    public function store(BookingRequest $request)
    {
        // Validation and sanitization
        $validated = $request->validated();

        // Authorization
        $this->authorize('create', Booking::class);

        // Processing
        return $this->bookingService->createBooking($validated);
    }
}
```

### 5.2 Error Handling

```php
class Handler extends ExceptionHandler
{
    public function register(): void
    {
        $this->reportable(function (Throwable $e) {
            // Log errors
        });

        $this->renderable(function (Exception $e) {
            // Custom error responses
        });
    }
}
```

## 6. Testing Strategy

### 6.1 Unit Tests

```php
class BookingTest extends TestCase
{
    public function test_can_create_booking()
    {
        $response = $this->post('/api/bookings', [
            'room_id' => 1,
            'guest_id' => 1,
            'check_in' => now(),
            'check_out' => now()->addDays(2)
        ]);

        $response->assertStatus(201);
    }
}
```

### 6.2 Feature Tests

```php
class RoomAvailabilityTest extends TestCase
{
    public function test_room_availability_check()
    {
        $room = Room::factory()->create();

        $response = $this->get("/api/rooms/{$room->id}/availability");

        $response->assertJson([
            'available' => true
        ]);
    }
}
```

## 7. Deployment Process

### 7.1 Deployment Steps

1. Code freeze and review
2. Run automated tests
3. Build assets
4. Database migrations
5. Deploy to staging
6. Testing in staging
7. Production deployment
8. Post-deployment verification

### 7.2 Monitoring

```php
// Health check implementation
Route::get('/health', function () {
    return [
        'status' => 'healthy',
        'database' => DB::connection()->getPdo() ? 'connected' : 'failed',
        'cache' => Cache::connection()->ping() ? 'connected' : 'failed',
        'version' => config('app.version')
    ];
});
```

## 8. Performance Optimization

### 8.1 Caching Strategy

```php
class RoomController extends Controller
{
    public function index()
    {
        return Cache::remember('rooms.all', 3600, function () {
            return Room::with('amenities')->get();
        });
    }
}
```

### 8.2 Query Optimization

```php
class BookingRepository
{
    public function getActiveBookings()
    {
        return Booking::with(['room', 'guest'])
            ->where('status', 'active')
            ->whereDate('check_out', '>=', now())
            ->get();
    }
}
```