[AI:Coder, HUMAN:-, MODEL: Claude 3.7 Sonnet] (#1) Add CustomerOverdueOrdersData DTO, extend ICustomerService, and implement GetCustomersWithOverdueOrders

Author: florinc

Modules/Contracts/Sales/CustomerOverdueOrdersData.cs

@@ -0,0 +1,8 @@
+namespace Contracts.Sales;
+
+public sealed class CustomerOverdueOrdersData
+{
+    public required string CustomerName { get; init; }
+    public int OverdueOrderCount { get; init; }
+    public DateTime OldestOverdueOrderDate { get; init; }
+}

Modules/Contracts/Sales/ICustomerService.cs

@@ -7,4 +7,6 @@ public interface ICustomerService
     CustomerData[] GetCustomersWithOrdersStartingWith(string prefix);
 
     CustomerData[] GetCustomersWithOrdersContaining(string fragment);
+
+    CustomerOverdueOrdersData[] GetCustomersWithOverdueOrders();
 }

Modules/Sales/Sales.Services/CustomerService.cs

@@ -3,12 +3,14 @@
 using AppBoot.DependencyInjection;
 using Contracts.Sales;
 using DataAccess;
+using Microsoft.Extensions.Logging;
 using Sales.DataModel.SalesLT;
+using Sales.DataModel.Values;
 
 namespace Sales.Services;
 
 [Service(typeof(ICustomerService))]
-class CustomerService(IRepository repository) : ICustomerService
+class CustomerService(IRepository repository, ILogger<CustomerService> logger) : ICustomerService
 {
     public CustomerData[] GetCustomersWithOrders()
     {
@@ -52,4 +54,32 @@ public CustomerData[] GetCustomersWithOrdersContaining(string fragment)
 
         return GetCustomersWithOrdersFilteredBy(filter);
     }
+
+    public CustomerOverdueOrdersData[] GetCustomersWithOverdueOrders()
+    {
+        logger.LogInformation("Retrieving customers with overdue orders");
+
+        var today = DateTime.Today;
+        var closedStatuses = new[] { SalesOrderHeaderStatusValues.Shipped, SalesOrderHeaderStatusValues.Cancelled };
+
+        var results = repository.GetEntities<SalesOrderHeader>()
+            .Where(o => o.DueDate < today && !closedStatuses.Contains(o.Status))
+            .GroupBy(o => o.Customer)
+            .Select(g => new CustomerOverdueOrdersData
+            {
+                CustomerName = !string.IsNullOrWhiteSpace(g.Key.CompanyName)
+                    ? g.Key.CompanyName
+                    : !string.IsNullOrWhiteSpace(g.Key.FirstName) || !string.IsNullOrWhiteSpace(g.Key.LastName)
+                        ? $"{g.Key.FirstName} {g.Key.LastName}".Trim()
+                        : $"Customer {g.Key.CustomerID}",
+                OverdueOrderCount = g.Count(),
+                OldestOverdueOrderDate = g.Min(o => o.DueDate)
+            })
+            .OrderBy(c => c.OldestOverdueOrderDate)
+            .ToArray();
+
+        logger.LogDebug("Found {Count} customers with overdue orders", results.Length);
+
+        return results;
+    }
 }