feat: qrcode com contador de leituras

Controllers/QRController.cs

@@ -307,8 +307,8 @@ namespace QRRapidoApp.Controllers
             var isAuthenticated = User?.Identity?.IsAuthenticated ?? false;
 
             // DEBUG: Log detalhado dos parâmetros recebidos
-            _logger.LogInformation("🔍 [DEBUG] GenerateRapidWithLogo called - RequestId: {RequestId}, ApplyLogoColorization: {ApplyLogoColorization}, LogoSizePercent: {LogoSizePercent}, HasLogo: {HasLogo}", 
+            _logger.LogInformation("🔍 [DEBUG] GenerateRapidWithLogo called - RequestId: {RequestId}, EnableTracking: {EnableTracking}, Type: {Type}, ApplyLogoColorization: {ApplyLogoColorization}, LogoSizePercent: {LogoSizePercent}, HasLogo: {HasLogo}",
-                requestId, request.ApplyLogoColorization, request.LogoSizePercent, request.HasLogo);
+                requestId, request.EnableTracking, request.Type, request.ApplyLogoColorization, request.LogoSizePercent, request.HasLogo);
             
             using (_logger.BeginScope(new Dictionary<string, object>
             {

Controllers/TrackingController.cs

@@ -0,0 +1,138 @@
+using Microsoft.AspNetCore.Mvc;
+using QRRapidoApp.Services;
+using System.Diagnostics;
+
+namespace QRRapidoApp.Controllers
+{
+    /// <summary>
+    /// Controller for tracking QR code scans (Premium feature)
+    /// Handles redirect URLs and analytics
+    /// </summary>
+    [Route("t")]
+    public class TrackingController : ControllerBase
+    {
+        private readonly IUserService _userService;
+        private readonly ILogger<TrackingController> _logger;
+
+        public TrackingController(IUserService userService, ILogger<TrackingController> logger)
+        {
+            _userService = userService;
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// Track QR code scan and redirect to original URL
+        /// URL format: https://qrrapido.site/t/{trackingId}
+        /// </summary>
+        [HttpGet("{trackingId}")]
+        public async Task<IActionResult> TrackAndRedirect(string trackingId)
+        {
+            var stopwatch = Stopwatch.StartNew();
+
+            using (_logger.BeginScope(new Dictionary<string, object>
+            {
+                ["TrackingId"] = trackingId,
+                ["QRTracking"] = true
+            }))
+            {
+                _logger.LogInformation("QR tracking request - TrackingId: {TrackingId}", trackingId);
+
+                try
+                {
+                    // Get QR code from database
+                    var qr = await _userService.GetQRByTrackingIdAsync(trackingId);
+
+                    if (qr == null)
+                    {
+                        _logger.LogWarning("QR code not found for tracking - TrackingId: {TrackingId}", trackingId);
+                        return NotFound("QR code not found");
+                    }
+
+                    // Increment scan count and update last access (fire and forget for performance)
+                    _ = Task.Run(async () =>
+                    {
+                        try
+                        {
+                            await _userService.IncrementQRScanCountAsync(trackingId);
+                            _logger.LogDebug("QR scan count incremented - TrackingId: {TrackingId}, NewCount: {NewCount}",
+                                trackingId, qr.ScanCount + 1);
+                        }
+                        catch (Exception ex)
+                        {
+                            _logger.LogError(ex, "Error incrementing scan count - TrackingId: {TrackingId}", trackingId);
+                        }
+                    });
+
+                    stopwatch.Stop();
+                    _logger.LogInformation("QR redirect - TrackingId: {TrackingId}, Destination: {Destination}, ProcessingTime: {ProcessingTimeMs}ms",
+                        trackingId, qr.Content, stopwatch.ElapsedMilliseconds);
+
+                    // Redirect to original URL (HTTP 302 temporary redirect)
+                    return Redirect(qr.Content);
+                }
+                catch (Exception ex)
+                {
+                    stopwatch.Stop();
+                    _logger.LogError(ex, "QR tracking failed - TrackingId: {TrackingId}, ProcessingTime: {ProcessingTimeMs}ms",
+                        trackingId, stopwatch.ElapsedMilliseconds);
+
+                    // Return error page instead of exposing exception details
+                    return StatusCode(500, "Error processing QR code");
+                }
+            }
+        }
+
+        /// <summary>
+        /// Get analytics for a specific QR code (requires authentication)
+        /// </summary>
+        [HttpGet("analytics/{trackingId}")]
+        public async Task<IActionResult> GetAnalytics(string trackingId)
+        {
+            var userId = User?.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+
+            if (string.IsNullOrEmpty(userId))
+            {
+                _logger.LogWarning("Analytics request without authentication - TrackingId: {TrackingId}", trackingId);
+                return Unauthorized();
+            }
+
+            try
+            {
+                var qr = await _userService.GetQRByTrackingIdAsync(trackingId);
+
+                if (qr == null)
+                {
+                    _logger.LogWarning("Analytics request for non-existent QR - TrackingId: {TrackingId}", trackingId);
+                    return NotFound();
+                }
+
+                // Verify ownership
+                if (qr.UserId != userId)
+                {
+                    _logger.LogWarning("Analytics request for QR owned by different user - TrackingId: {TrackingId}, RequestingUser: {UserId}, Owner: {OwnerId}",
+                        trackingId, userId, qr.UserId);
+                    return Forbid();
+                }
+
+                _logger.LogInformation("Analytics retrieved - TrackingId: {TrackingId}, UserId: {UserId}, ScanCount: {ScanCount}",
+                    trackingId, userId, qr.ScanCount);
+
+                return Ok(new
+                {
+                    trackingId = qr.TrackingId,
+                    scanCount = qr.ScanCount,
+                    createdAt = qr.CreatedAt,
+                    lastAccessedAt = qr.LastAccessedAt,
+                    content = qr.Content,
+                    type = qr.Type
+                });
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error retrieving analytics - TrackingId: {TrackingId}, UserId: {UserId}",
+                    trackingId, userId);
+                return StatusCode(500);
+            }
+        }
+    }
+}

Docs/QR-Analytics-Feature.md

@@ -0,0 +1,345 @@
+# 📊 QR Code Analytics - Premium Feature
+
+Sistema de rastreamento de leituras de QR codes para usuários premium.
+
+## 🎯 Visão Geral
+
+Permite que usuários premium acompanhem quantas vezes seus QR codes foram escaneados, com timestamps e histórico completo.
+
+### Como Funciona
+
+1. **Usuário premium** gera QR code com analytics habilitado
+2. QR code aponta para URL de redirect: `https://qrrapido.site/t/{trackingId}`
+3. Ao escanear, o sistema:
+   - Incrementa contador de leituras (`scanCount`)
+   - Atualiza timestamp da última leitura (`lastAccessedAt`)
+   - Redireciona para URL original (HTTP 302)
+
+---
+
+## 🔧 Implementação Técnica
+
+### Novos Componentes
+
+#### 1. **TrackingController** (`Controllers/TrackingController.cs`)
+
+Endpoints:
+- `GET /t/{trackingId}` - Redireciona e contabiliza leitura
+- `GET /t/analytics/{trackingId}` - Retorna analytics (requer autenticação)
+
+#### 2. **Campos no MongoDB**
+
+**QRCodeHistory** (campos já existentes, agora em uso):
+```csharp
+public int ScanCount { get; set; } = 0;           // Contador de leituras
+public DateTime LastAccessedAt { get; set; }       // Última leitura
+public bool IsDynamic { get; set; } = false;      // Se é trackable
+public string? TrackingId { get; set; }           // ID público (novo)
+```
+
+#### 3. **QRGenerationRequest** (novo campo)
+```csharp
+public bool EnableTracking { get; set; } = false; // Premium feature
+```
+
+#### 4. **UserService** (novos métodos)
+```csharp
+Task<QRCodeHistory?> GetQRByTrackingIdAsync(string trackingId);
+Task IncrementQRScanCountAsync(string trackingId);
+```
+
+---
+
+## 🚀 Como Usar
+
+### Backend (já implementado)
+
+#### Gerar QR com Analytics
+
+```csharp
+var request = new QRGenerationRequest
+{
+    Type = "url",
+    Content = "https://google.com",
+    IsPremium = true,
+    EnableTracking = true  // ✅ Habilita analytics
+};
+
+var result = await _qrService.GenerateRapidAsync(request);
+
+// result.TrackingId conterá o ID para analytics
+// QR code aponta para: https://qrrapido.site/t/{trackingId}
+```
+
+#### Consultar Analytics
+
+```csharp
+// Via UserService
+var qr = await _userService.GetQRByTrackingIdAsync("abc123def456");
+Console.WriteLine($"Leituras: {qr.ScanCount}");
+Console.WriteLine($"Última leitura: {qr.LastAccessedAt}");
+
+// Via API (requer autenticação)
+GET /t/analytics/abc123def456
+```
+
+**Response:**
+```json
+{
+  "trackingId": "abc123def456",
+  "scanCount": 42,
+  "createdAt": "2025-10-19T10:00:00Z",
+  "lastAccessedAt": "2025-10-20T15:30:00Z",
+  "content": "https://google.com",
+  "type": "url"
+}
+```
+
+---
+
+### Frontend (ainda não implementado)
+
+#### Opção 1: Checkbox no Gerador
+
+```html
+<!-- Em Views/Home/Index.cshtml -->
+<div class="form-check premium-feature">
+  <input type="checkbox" id="enableTracking" class="form-check-input">
+  <label for="enableTracking">
+    <i class="fas fa-chart-line"></i> Habilitar Analytics
+    <span class="badge bg-warning">Premium</span>
+  </label>
+</div>
+```
+
+```javascript
+// Em wwwroot/js/qr-speed-generator.js
+const enableTracking = document.getElementById('enableTracking');
+
+formData.append('EnableTracking', enableTracking?.checked && this.isPremium);
+```
+
+#### Opção 2: Dashboard de Analytics
+
+```html
+<!-- Nova view: Views/Premium/Analytics.cshtml -->
+<div class="analytics-dashboard">
+  <h2>Meus QR Codes com Analytics</h2>
+
+  <div class="qr-list">
+    @foreach (var qr in Model.TrackableQRs)
+    {
+      <div class="qr-card">
+        <h3>@qr.Content</h3>
+        <p><strong>Leituras:</strong> @qr.ScanCount</p>
+        <p><strong>Última leitura:</strong> @qr.LastAccessedAt.ToString("dd/MM/yyyy HH:mm")</p>
+        <a href="/t/analytics/@qr.TrackingId">Ver detalhes</a>
+      </div>
+    }
+  </div>
+</div>
+```
+
+---
+
+## 📝 Limitações Conhecidas
+
+### 1. **Apenas QR codes de URL**
+- Tracking funciona apenas para `Type = "url"`
+- WiFi, vCard, SMS, etc. **não suportam** redirect
+
+**Razão**: Esses tipos não aceitam URLs customizadas
+
+**Solução futura**: Implementar pixel de tracking invisível ou API de scan manual
+
+### 2. **Redirect adiciona ~50-200ms**
+- Usuário experimenta pequeno delay ao escanear
+- Impacto: Mínimo para maioria dos casos
+
+**Otimização**: Redirect é assíncrono, contador atualiza em background
+
+### 3. **Bloqueadores de ads podem afetar**
+- Alguns bloqueadores podem marcar `/t/` como tracking
+- Probabilidade: Baixa (não usa cookies ou JS)
+
+---
+
+## 🔐 Segurança
+
+### Proteções Implementadas
+
+1. **Tracking ID não-sequencial**: GUID truncado (12 chars)
+2. **Validação de ownership**: Endpoint `/t/analytics/` verifica se QR pertence ao usuário
+3. **Fire-and-forget counting**: Não bloqueia redirect se MongoDB estiver lento
+4. **Logging completo**: Todas as leituras são logadas
+
+### Considerações de Privacidade
+
+- **Não coleta**: IP, device, localização (por enquanto)
+- **Apenas conta**: Quantidade de leituras + timestamp
+- **LGPD compliant**: Usuário premium pode deletar histórico a qualquer momento
+
+---
+
+## 📊 Exemplos de Uso
+
+### Caso 1: Rastreamento de Campanha
+
+```csharp
+// Gerar QR para campanha de marketing
+var campaign = new QRGenerationRequest
+{
+    Type = "url",
+    Content = "https://minhaloja.com/promo-verao",
+    IsPremium = true,
+    EnableTracking = true
+};
+
+var qr = await _qrService.GenerateRapidAsync(campaign);
+
+// Distribuir QR em materiais impressos
+// Depois consultar: await _userService.GetQRByTrackingIdAsync(qr.TrackingId);
+```
+
+### Caso 2: Validação de Engajamento
+
+```csharp
+// Verificar se QR code em outdoor teve leituras
+var qr = await _userService.GetQRByTrackingIdAsync("abc123def456");
+
+if (qr.ScanCount > 100)
+{
+    Console.WriteLine("Outdoor teve boa visibilidade!");
+}
+else if (qr.ScanCount == 0)
+{
+    Console.WriteLine("QR pode estar ilegível ou mal posicionado");
+}
+```
+
+---
+
+## 🛠️ Configuração
+
+### appsettings.json
+
+```json
+{
+  "App": {
+    "BaseUrl": "https://qrrapido.site"  // ✅ Usado para gerar URLs de tracking
+  }
+}
+```
+
+### appsettings.Development.json
+
+```json
+{
+  "App": {
+    "BaseUrl": "https://localhost:52428"  // ✅ Para testes locais
+  }
+}
+```
+
+---
+
+## 🧪 Testando Localmente
+
+### 1. Gerar QR com Tracking
+
+```bash
+# POST /api/QR/GenerateRapid
+curl -X POST https://localhost:52428/api/QR/GenerateRapid \
+  -H "Content-Type: application/json" \
+  -d '{
+    "type": "url",
+    "content": "https://google.com",
+    "isPremium": true,
+    "enableTracking": true
+  }'
+```
+
+**Response:**
+```json
+{
+  "qrCodeBase64": "iVBORw0KG...",
+  "trackingId": "a1b2c3d4e5f6",
+  "success": true
+}
+```
+
+### 2. Simular Leitura do QR
+
+```bash
+# Abrir no navegador (ou curl)
+curl -L https://localhost:52428/t/a1b2c3d4e5f6
+# Deve redirecionar para https://google.com
+```
+
+### 3. Verificar Contador
+
+```bash
+# Acessar MongoDB ou via API
+curl https://localhost:52428/t/analytics/a1b2c3d4e5f6 \
+  -H "Authorization: Bearer {token}"
+```
+
+**Response:**
+```json
+{
+  "trackingId": "a1b2c3d4e5f6",
+  "scanCount": 1,
+  "lastAccessedAt": "2025-10-20T10:00:00Z"
+}
+```
+
+---
+
+## 📈 Próximos Passos (Features Futuras)
+
+### Analytics Avançado
+- [ ] Gráfico de leituras por dia/semana/mês
+- [ ] Geo-localização (IP → País/Cidade)
+- [ ] Tipo de device (mobile/desktop)
+- [ ] Browser/OS usado para escanear
+
+### UI/UX
+- [ ] Dashboard de analytics no painel premium
+- [ ] Exportar dados para CSV/Excel
+- [ ] Notificações quando QR atingir X leituras
+
+### Performance
+- [ ] Cache Redis para evitar queries MongoDB em cada scan
+- [ ] Batch updates (atualizar contador a cada N leituras)
+
+---
+
+## 📚 Referências
+
+- **Tracking URLs**: Mesma estratégia usada por bit.ly, tinyurl, etc.
+- **HTTP 302 Redirect**: Padrão para preservar SEO e funcionalidade
+- **Fire-and-forget**: Pattern do ASP.NET Core para operações assíncronas não-bloqueantes
+
+---
+
+## 🐛 Troubleshooting
+
+### Problema: "QR code not found"
+- Verificar se `trackingId` existe no MongoDB
+- Verificar se QR foi salvo com `IsDynamic = true`
+
+### Problema: Contador não incrementa
+- Verificar logs do `TrackingController`
+- Verificar conectividade MongoDB
+- Verificar se `IncrementQRScanCountAsync` está sendo chamado
+
+### Problema: Redirect não funciona
+- Verificar se URL original está salva em `Content`
+- Verificar se `BaseUrl` está configurado corretamente
+- Verificar logs de erro no controller
+
+---
+
+**Implementado em**: 2025-10-20
+**Versão**: 1.0.0
+**Status**: ✅ Backend completo, Frontend pendente

Models/QRCodeHistory.cs

@@ -36,6 +36,9 @@ namespace QRRapidoApp.Models
         [BsonElement("isDynamic")]
         public bool IsDynamic { get; set; } = false;
 
+        [BsonElement("trackingId")]
+        public string? TrackingId { get; set; } // Public ID for tracking URL (premium feature)
+
         [BsonElement("size")]
         public int Size { get; set; } = 300;
 

Models/ViewModels/QRGenerationRequest.cs

@@ -28,6 +28,12 @@ namespace QRRapidoApp.Models.ViewModels
         /// Se deve aplicar a cor do QR code no logo (Premium feature)
         /// </summary>
         public bool ApplyLogoColorization { get; set; } = false;
+
+        /// <summary>
+        /// Se deve habilitar analytics de leitura (Premium feature)
+        /// Quando habilitado, o QR code usa URL de redirect para contabilizar leituras
+        /// </summary>
+        public bool EnableTracking { get; set; } = false;
     }
 
     public class QRGenerationResult
@@ -42,5 +48,6 @@ namespace QRRapidoApp.Models.ViewModels
         public bool Success { get; set; } = true;
         public string? ErrorMessage { get; set; }
         public LogoReadabilityInfo? ReadabilityInfo { get; set; } // Nova propriedade para análise de legibilidade
+        public string? TrackingId { get; set; } // Tracking ID for analytics (Premium feature)
     }
 }

Resources/SharedResource.en.resx

@@ -783,4 +783,23 @@
   <data name="AnonymousUserLimit" xml:space="preserve">
     <value>Anonymous users: 3 QR codes per day</value>
   </data>
+  <!-- Premium Features -->
+  <data name="AdvancedCustomization" xml:space="preserve">
+    <value>Advanced customization (colors, corners)</value>
+  </data>
+  <data name="LogoSupport" xml:space="preserve">
+    <value>Logo and image support</value>
+  </data>
+  <data name="HistoryAndDownloads" xml:space="preserve">
+    <value>Unlimited history and downloads</value>
+  </data>
+  <data name="QRReadCounter" xml:space="preserve">
+    <value>QR code scan counter</value>
+  </data>
+  <data name="EnableTracking" xml:space="preserve">
+    <value>Enable scan counter</value>
+  </data>
+  <data name="TrackingInfo" xml:space="preserve">
+    <value>QR code will use redirect URL to count scans</value>
+  </data>
 </root>

Resources/SharedResource.es-PY.resx

@@ -2041,6 +2041,15 @@
   <data name="HistoryAndDownloads" xml:space="preserve">
     <value>Historial y descargas ilimitadas</value>
   </data>
+  <data name="QRReadCounter" xml:space="preserve">
+    <value>Contador de lecturas de códigos QR</value>
+  </data>
+  <data name="EnableTracking" xml:space="preserve">
+    <value>Habilitar contador de lecturas</value>
+  </data>
+  <data name="TrackingInfo" xml:space="preserve">
+    <value>El código QR usará URL de redireccionamiento para contabilizar lecturas</value>
+  </data>
   <!-- FAQ Updates -->
   <data name="FAQ_StaticQRExplanation" xml:space="preserve">
     <value>Todos los códigos QR generados por QR Rápido son estáticos y permanentes. Esto significa que el contenido está codificado directamente en el código QR y no puede ser modificado después de la generación. Este enfoque garantiza máxima privacidad, ya que no rastreamos escaneos, y funciona sin conexión sin depender de servidores externos.</value>

Resources/SharedResource.pt-BR.resx

@@ -2131,6 +2131,15 @@
   <data name="HistoryAndDownloads" xml:space="preserve">
     <value>Histórico e downloads ilimitados</value>
   </data>
+  <data name="QRReadCounter" xml:space="preserve">
+    <value>Contador de leituras de QR codes</value>
+  </data>
+  <data name="EnableTracking" xml:space="preserve">
+    <value>Habilitar contador de leituras</value>
+  </data>
+  <data name="TrackingInfo" xml:space="preserve">
+    <value>QR code usará URL de redirect para contabilizar leituras</value>
+  </data>
   <!-- FAQ Updates -->
   <data name="FAQ_StaticQRExplanation" xml:space="preserve">
     <value>Todos os QR codes gerados pelo QR Rápido são estáticos e permanentes. Isso significa que o conteúdo é codificado diretamente no QR code e não pode ser alterado após a geração. Essa abordagem garante máxima privacidade, pois não rastreamos scans, e funciona offline sem depender de servidores externos.</value>

Services/IUserService.cs

@@ -28,5 +28,9 @@ namespace QRRapidoApp.Services
         Task MarkPremiumCancelledAsync(string userId, DateTime cancelledAt);
         Task<List<User>> GetUsersForHistoryCleanupAsync(DateTime cutoffDate);
         Task DeleteUserHistoryAsync(string userId);
+
+        // QR Code Tracking (Analytics) - Premium feature
+        Task<QRCodeHistory?> GetQRByTrackingIdAsync(string trackingId);
+        Task IncrementQRScanCountAsync(string trackingId);
     }
 }

Services/QRRapidoService.cs

@@ -45,6 +45,30 @@ namespace QRRapidoApp.Services
             {
                 await _semaphore.WaitAsync();
 
+                // Generate tracking ID for premium users with tracking enabled
+                string? trackingId = null;
+                string originalContent = request.Content;
+
+                // DEBUG: Log all conditions
+                _logger.LogInformation("[TRACKING DEBUG] IsPremium: {IsPremium}, EnableTracking: {EnableTracking}, Type: {Type}",
+                    request.IsPremium, request.EnableTracking, request.Type);
+
+                if (request.IsPremium && request.EnableTracking && request.Type == "url")
+                {
+                    // Only URL type QR codes can use tracking (redirect functionality)
+                    trackingId = Guid.NewGuid().ToString("N").Substring(0, 12); // 12-char tracking ID
+                    var baseUrl = _config.GetValue<string>("App:BaseUrl", "https://qrrapido.site");
+                    request.Content = $"{baseUrl}/t/{trackingId}";
+
+                    _logger.LogInformation("✅ Tracking enabled for QR - TrackingId: {TrackingId}, OriginalURL: {OriginalURL}",
+                        trackingId, originalContent);
+                }
+                else
+                {
+                    _logger.LogWarning("❌ Tracking NOT enabled - IsPremium: {IsPremium}, EnableTracking: {EnableTracking}, Type: {Type}",
+                        request.IsPremium, request.EnableTracking, request.Type);
+                }
+
                 // Cache key based on content and settings
                 var cacheKey = GenerateCacheKey(request);
                 var cached = await _cache.GetStringAsync(cacheKey);
@@ -59,13 +83,13 @@ namespace QRRapidoApp.Services
                     {
                         cachedResult.GenerationTimeMs = stopwatch.ElapsedMilliseconds;
                         cachedResult.FromCache = true;
-                        
+
                         // Se não tem análise de legibilidade no cache, gerar agora
                         if (cachedResult.ReadabilityInfo == null)
                         {
                             cachedResult.ReadabilityInfo = await _readabilityAnalyzer.AnalyzeAsync(request, request.Size);
                         }
-                        
+
                         return cachedResult;
                     }
                 }
@@ -86,9 +110,16 @@ namespace QRRapidoApp.Services
                     Size = qrCode.Length,
                     RequestSettings = request,
                     Success = true,
-                    ReadabilityInfo = readabilityInfo
+                    ReadabilityInfo = readabilityInfo,
+                    TrackingId = trackingId // Include tracking ID if enabled
                 };
 
+                // Restore original content if tracking was enabled
+                if (trackingId != null)
+                {
+                    request.Content = originalContent;
+                }
+
                 // Cache for configurable time
                 var cacheExpiration = TimeSpan.FromMinutes(_config.GetValue<int>("Performance:CacheExpirationMinutes", 60));
                 await _cache.SetStringAsync(cacheKey, JsonSerializer.Serialize(result), new DistributedCacheEntryOptions

Services/UserService.cs

@@ -231,7 +231,9 @@ namespace QRRapidoApp.Services
                     GenerationTimeMs = qrResult.GenerationTimeMs,
                     FromCache = qrResult.FromCache,
                     IsActive = true,
-                    LastAccessedAt = DateTime.UtcNow
+                    LastAccessedAt = DateTime.UtcNow,
+                    TrackingId = qrResult.TrackingId, // Save tracking ID for analytics
+                    IsDynamic = !string.IsNullOrEmpty(qrResult.TrackingId) // Mark as dynamic if tracking is enabled
                 };
 
                 await _context.QRCodeHistory.InsertOneAsync(qrHistory);
@@ -448,5 +450,52 @@ namespace QRRapidoApp.Services
             var update = Builders<User>.Update.Set(u => u.StripeCustomerId, stripeCustomerId);
             await _context.Users.UpdateOneAsync(u => u.Id == userId, update);
         }
+
+        /// <summary>
+        /// Get QR code by tracking ID (for analytics)
+        /// </summary>
+        public async Task<QRCodeHistory?> GetQRByTrackingIdAsync(string trackingId)
+        {
+            try
+            {
+                return await _context.QRCodeHistory
+                    .Find(q => q.TrackingId == trackingId && q.IsActive)
+                    .FirstOrDefaultAsync();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error getting QR by tracking ID {TrackingId}: {ErrorMessage}", trackingId, ex.Message);
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// Increment scan count for QR code analytics
+        /// </summary>
+        public async Task IncrementQRScanCountAsync(string trackingId)
+        {
+            try
+            {
+                var filter = Builders<QRCodeHistory>.Filter.Eq(q => q.TrackingId, trackingId);
+                var update = Builders<QRCodeHistory>.Update
+                    .Inc(q => q.ScanCount, 1)
+                    .Set(q => q.LastAccessedAt, DateTime.UtcNow);
+
+                var result = await _context.QRCodeHistory.UpdateOneAsync(filter, update);
+
+                if (result.ModifiedCount > 0)
+                {
+                    _logger.LogDebug("QR scan count incremented - TrackingId: {TrackingId}", trackingId);
+                }
+                else
+                {
+                    _logger.LogWarning("Failed to increment scan count - TrackingId not found: {TrackingId}", trackingId);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error incrementing scan count for {TrackingId}: {ErrorMessage}", trackingId, ex.Message);
+            }
+        }
     }
 }

Views/Home/Index.cshtml

@@ -682,7 +682,7 @@
                                                     <div class="col-md-6 mb-3">
                                                         <div class="premium-upgrade-box p-3 border rounded bg-light">
                                                             <h6 class="fw-bold mb-2">
-                                                                <i class="fas fa-crown text-warning"></i> 
+                                                                <i class="fas fa-crown text-warning"></i>
                                                                 Logo Personalizado - Premium
                                                             </h6>
                                                             <p class="mb-2 small">Adicione sua marca aos QR Codes! Agora com tamanho configurável (10-25%) e colorização automática.</p>
@@ -692,6 +692,23 @@
                                                         </div>
                                                     </div>
                                                 }
+
+                                                @* Analytics/Tracking - Premium Feature *@
+                                                @if (isPremium)
+                                                {
+                                                    <div class="col-12 mb-3">
+                                                        <div class="form-check">
+                                                            <input type="checkbox" id="enable-tracking" class="form-check-input" value="true">
+                                                            <label class="form-check-label" for="enable-tracking">
+                                                                <i class="fas fa-chart-line text-primary"></i> @Localizer["EnableTracking"]
+                                                                <span class="badge bg-primary">Premium</span>
+                                                            </label>
+                                                            <div class="form-text">
+                                                                <i class="fas fa-info-circle"></i> @Localizer["TrackingInfo"]
+                                                            </div>
+                                                        </div>
+                                                    </div>
+                                                }
                                                 
                                                 <div class="col-md-6 mb-3">
                                                     <label class="form-label">@Localizer["BorderStyle"]</label>
@@ -1195,6 +1212,7 @@
                             <li><i class="fas fa-check text-success"></i> @Localizer["AdvancedCustomization"]</li>
                             <li><i class="fas fa-check text-success"></i> @Localizer["LogoSupport"]</li>
                             <li><i class="fas fa-check text-success"></i> @Localizer["HistoryAndDownloads"]</li>
+                            <li><i class="fas fa-chart-line text-success"></i> @Localizer["QRReadCounter"]</li>
                             <li><i class="fas fa-check text-success"></i> @Localizer["PrioritySupport"]</li>
                         </ul>
                         <div class="text-center">

Views/Pagamento/SelecaoPlano.cshtml

@@ -76,6 +76,7 @@
                 <li class="list-group-item border-0"><i class="fas fa-check-circle text-success me-2"></i>@Localizer["AdvancedCustomization"]</li>
                 <li class="list-group-item border-0"><i class="fas fa-check-circle text-success me-2"></i>@Localizer["LogoSupport"]</li>
                 <li class="list-group-item border-0"><i class="fas fa-check-circle text-success me-2"></i>@Localizer["HistoryAndDownloads"]</li>
+                <li class="list-group-item border-0"><i class="fas fa-chart-line text-success me-2"></i>@Localizer["QRReadCounter"]</li>
                 <li class="list-group-item border-0"><i class="fas fa-check-circle text-success me-2"></i>@Localizer["PrioritySupport"]</li>
             </ul>
         </div>

wwwroot/js/qr-speed-generator.js

@@ -1,9 +1,14 @@
 // QR Rapido Speed Generator
-class QRRapidoGenerator { 
+class QRRapidoGenerator {
     constructor() {
         this.startTime = 0;
         this.currentQR = null;
         this.timerInterval = null;
+
+        // Initialize premium status from hidden input
+        this.isPremium = this.checkUserPremium();
+        console.log('[INIT] QRRapidoGenerator - isPremium:', this.isPremium);
+
         this.languageStrings = {
             'pt-BR': {
                 tagline: 'Gere QR codes em segundos!',
@@ -737,6 +742,9 @@ class QRRapidoGenerator {
         const finalBackgroundColor = userBackgroundColor || (styleSettings.backgroundColor || '#FFFFFF');
         
         // Common data for both endpoints
+        const trackingEnabled = this.getTrackingEnabled();
+        console.log('[DEBUG] getTrackingEnabled() returned:', trackingEnabled, 'type:', typeof trackingEnabled);
+
         const commonData = {
             type: actualType,
             content: encodedContent,
@@ -747,9 +755,12 @@ class QRRapidoGenerator {
             margin: parseInt(document.getElementById('qr-margin').value),
             cornerStyle: document.getElementById('corner-style')?.value || 'square',
             optimizeForSpeed: true,
-            language: this.currentLang
+            language: this.currentLang,
+            enableTracking: trackingEnabled // Analytics feature for premium users
         };
 
+        console.log('[DEBUG] commonData.enableTracking:', commonData.enableTracking);
+
         // Add dynamic QR data if it's a URL type
         if (type === 'url') {
             let dynamicData;
@@ -772,11 +783,15 @@ class QRRapidoGenerator {
             // Use FormData for requests with logo
             const formData = new FormData();
             
-            // Add all common data to FormData
+            // Add all common data to FormData with PascalCase for ASP.NET Core model binding
             Object.keys(commonData).forEach(key => {
-                formData.append(key, commonData[key]);
+                // Convert camelCase to PascalCase for FormData (ASP.NET Core compatibility)
+                const pascalKey = key.charAt(0).toUpperCase() + key.slice(1);
+                const value = commonData[key];
+                console.log('[DEBUG] FormData.append:', pascalKey, '=', value, 'type:', typeof value);
+                formData.append(pascalKey, value);
             });
-            
+
             // NOVOS PARÂMETROS DE LOGO APRIMORADO
             const logoSettings = this.getLogoSettings();
             formData.append('LogoSizePercent', logoSettings.logoSizePercent.toString());
@@ -808,13 +823,38 @@ class QRRapidoGenerator {
     getLogoSettings() {
         const logoSizeSlider = document.getElementById('logo-size-slider');
         const logoColorizeToggle = document.getElementById('logo-colorize-toggle');
-        
+
         return {
             logoSizePercent: parseInt(logoSizeSlider?.value || '20'),
             applyColorization: logoColorizeToggle?.checked || false
         };
     }
 
+    // Function to check if tracking is enabled (Premium feature)
+    getTrackingEnabled() {
+        const trackingCheckbox = document.getElementById('enable-tracking');
+
+        // DEBUG: Log each condition separately
+        console.log('[DEBUG] getTrackingEnabled() - Checkbox exists:', !!trackingCheckbox);
+        console.log('[DEBUG] getTrackingEnabled() - Checkbox checked:', trackingCheckbox?.checked);
+        console.log('[DEBUG] getTrackingEnabled() - this.isPremium:', this.isPremium);
+
+        // Only return true if checkbox exists, is checked, and user is premium
+        // IMPORTANT: Always return boolean (not undefined) for FormData compatibility
+        const result = !!(trackingCheckbox && trackingCheckbox.checked && this.isPremium);
+        console.log('[DEBUG] getTrackingEnabled() - Final result:', result);
+        return result;
+    }
+
+    // Check if user has premium status
+    checkUserPremium() {
+        const premiumStatus = document.getElementById('user-premium-status');
+        if (premiumStatus) {
+            return premiumStatus.value === 'premium';
+        }
+        return false;
+    }
+
     // Função auxiliar para obter conteúdo baseado no tipo
     getContentForType(type) {
         if (type === 'url') {