feat: add webhook notifications for invoice status changes

Implements INotificationService with Teams/Slack-compatible WebhookNotificationService.
Fires on ValidateInvoice and ChangeInvoiceStatus. Silently skipped if WebhookUrl not configured.

DoliMiddlewareApi/Program.cs

@@ -3,6 +3,7 @@ using DoliMiddlewareApi.Exceptions;
 using DoliMiddlewareApi.Services;
 using DoliMiddlewareApi.Services.Auth;
 using DoliMiddlewareApi.Services.Clients;
+using DoliMiddlewareApi.Services.Notifications;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.Extensions.Caching.Memory;
@@ -46,7 +47,7 @@ builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
     });
 
 builder.Services.AddAuthorization();
-
+    
 // CORS Configuration
 builder.Services.AddCors(options =>
 {
@@ -123,6 +124,15 @@ builder.Services.AddMemoryCache();
 // HttpContext accessor para acceder a User.Claims en servicios
 builder.Services.AddHttpContextAccessor();
 
+builder.Services.AddHttpClient("Webhook");
+
+// =========================================
+// NOTIFICACIONES — Webhook (Teams / Slack)
+// Configura Notifications:WebhookUrl en appsettings o variable de entorno
+// Si no está configurado, las notificaciones se ignoran silenciosamente
+// =========================================
+builder.Services.AddScoped<INotificationService, WebhookNotificationService>();
+
 var app = builder.Build();
 
 // =========================================

DoliMiddlewareApi/Services/InvoiceService.cs

@@ -7,10 +7,11 @@ using DoliMiddlewareApi.Dtos.query;
 using DoliMiddlewareApi.Exceptions;
 using DoliMiddlewareApi.Mappers;
 using DoliMiddlewareApi.Services.Clients;
+using DoliMiddlewareApi.Services.Notifications;
 
 namespace DoliMiddlewareApi.Services;
 
-public class InvoiceService(IDolibarrApiClient apiClient)
+public class InvoiceService(IDolibarrApiClient apiClient, INotificationService notifications)
 {
     public async Task<InvoiceDetailDto> GetInvoiceAsync(int id)
     {
@@ -121,13 +122,17 @@ public class InvoiceService(IDolibarrApiClient apiClient)
         var normalized = status.Trim().ToLowerInvariant();
         var endpoint = normalized switch
         {
-            "draft" => $"invoices/{id}/settodraft",
+            "draft"  => $"invoices/{id}/settodraft",
             "unpaid" => $"invoices/{id}/settounpaid",
-            "paid" => $"invoices/{id}/settopaid",
+            "paid"   => $"invoices/{id}/settopaid",
             _ => throw new ValidationException("Estado invalido. Usa: draft, unpaid, paid.")
         };
 
         await apiClient.PostAsync(endpoint, new { });
+
+        // Notificación a Teams/Slack — fire and forget desde el punto de vista del caller
+        var invoice = await apiClient.GetResourceAsync<InvoiceDetailResponse>($"invoices/{id}");
+        await notifications.NotifyInvoiceStatusChangedAsync(id, invoice.@ref ?? $"#{id}", normalized);
     }
 
     public async Task ValidateInvoiceAsync(int id)
@@ -136,6 +141,8 @@ public class InvoiceService(IDolibarrApiClient apiClient)
         if (invoice.statut != "0") throw new ForbiddenException("Solo se pueden validar facturas en borrador (draft)");
 
         await apiClient.PostAsync($"invoices/{id}/validate", new { });
+
+        await notifications.NotifyInvoiceStatusChangedAsync(id, invoice.@ref ?? $"#{id}", "unpaid");
     }
 
     public async Task DeleteInvoiceAsync(int id)

DoliMiddlewareApi/Services/Notifications/INotificationService.cs

@@ -0,0 +1,6 @@
+namespace DoliMiddlewareApi.Services.Notifications;
+
+public interface INotificationService
+{
+    Task NotifyInvoiceStatusChangedAsync(int invoiceId, string invoiceRef, string newStatus);
+}

DoliMiddlewareApi/Services/Notifications/WebhookNotificationService.cs

@@ -0,0 +1,126 @@
+using System.Text;
+using System.Text.Json;
+
+namespace DoliMiddlewareApi.Services.Notifications;
+
+/// <summary>
+/// Envía notificaciones a un webhook de Teams o Slack cuando cambia el estado de una factura.
+/// Compatible con Teams (Adaptive Cards) y Slack (Block Kit).
+/// Configurar la URL en appsettings: Notifications:WebhookUrl
+/// </summary>
+public class WebhookNotificationService(
+    IHttpClientFactory httpClientFactory,
+    IConfiguration configuration,
+    ILogger<WebhookNotificationService> logger) : INotificationService
+{
+    private static readonly Dictionary<string, (string label, string color)> StatusMeta = new()
+    {
+        ["draft"]  = ("Borrador",  "#8a7dff"),
+        ["unpaid"] = ("Pendiente de pago", "#ffb454"),
+        ["paid"]   = ("Pagada ✓",  "#5dd39e"),
+    };
+
+    public async Task NotifyInvoiceStatusChangedAsync(int invoiceId, string invoiceRef, string newStatus)
+    {
+        var webhookUrl = configuration["Notifications:WebhookUrl"];
+        if (string.IsNullOrWhiteSpace(webhookUrl))
+            return; // Notificaciones desactivadas — no hay webhook configurado
+
+        var (label, color) = StatusMeta.GetValueOrDefault(newStatus, (newStatus, "#888"));
+
+        var payload = BuildPayload(invoiceId, invoiceRef, label, color);
+
+        try
+        {
+            var client = httpClientFactory.CreateClient("Webhook");
+            var content = new StringContent(
+                JsonSerializer.Serialize(payload),
+                Encoding.UTF8,
+                "application/json");
+
+            var response = await client.PostAsync(webhookUrl, content);
+
+            if (!response.IsSuccessStatusCode)
+                logger.LogWarning(
+                    "Webhook respondió {Status} para factura {InvoiceId}",
+                    response.StatusCode, invoiceId);
+        }
+        catch (Exception ex)
+        {
+            // Nunca rompemos el flujo principal por un fallo en notificaciones
+            logger.LogError(ex,
+                "Error enviando notificación para factura {InvoiceId}", invoiceId);
+        }
+    }
+
+    /// <summary>
+    /// Construye un payload compatible con Teams (Adaptive Card via Incoming Webhook)
+    /// y con Slack (message payload básico con attachments).
+    /// Teams espera { "type": "message", "attachments": [...] } con Adaptive Card.
+    /// Slack espera { "text": "...", "attachments": [...] }.
+    /// Detectamos por URL cuál usar.
+    /// </summary>
+    private object BuildPayload(int invoiceId, string invoiceRef, string label, string color)
+    {
+        var webhookUrl = configuration["Notifications:WebhookUrl"] ?? "";
+
+        if (webhookUrl.Contains("slack.com"))
+        {
+            return new
+            {
+                text = $"🧾 Factura *{invoiceRef}* ha cambiado de estado",
+                attachments = new[]
+                {
+                    new
+                    {
+                        color,
+                        fields = new[]
+                        {
+                            new { title = "Factura", value = invoiceRef, @short = true },
+                            new { title = "Estado",  value = label,      @short = true },
+                        }
+                    }
+                }
+            };
+        }
+
+        // Teams — Adaptive Card
+        return new
+        {
+            type = "message",
+            attachments = new[]
+            {
+                new
+                {
+                    contentType = "application/vnd.microsoft.card.adaptive",
+                    content = new
+                    {
+                        type    = "AdaptiveCard",
+                        version = "1.4",
+                        body = new object[]
+                        {
+                            new
+                            {
+                                type   = "TextBlock",
+                                text   = "🧾 Estado de factura actualizado",
+                                weight = "Bolder",
+                                size   = "Medium"
+                            },
+                            new
+                            {
+                                type  = "FactSet",
+                                facts = new[]
+                                {
+                                    new { title = "Factura", value = invoiceRef },
+                                    new { title = "ID",      value = invoiceId.ToString() },
+                                    new { title = "Estado",  value = label },
+                                }
+                            }
+                        },
+                        msteams = new { width = "Full" }
+                    }
+                }
+            }
+        };
+    }
+}

DoliMiddlewareApi/appsettings.json

@@ -15,5 +15,7 @@
     "Secret": "mi-super-secreto-jwt-aqui-cambiar-en-produccion",
     "Issuer": "DoliMiddleware",
     "Audience": "DoliClients"
-  }
-}
+  },
+  "Notifications":{
+    "WebhookUrl": ""
+}}