Added package management

LiteCharms.Features/ShoppingCarts/Queries/GetShoppingCartPackagesQuery.cs

@@ -0,0 +1,18 @@
+using LiteCharms.Models;
+
+namespace LiteCharms.Features.ShoppingCarts.Queries;
+
+public class GetShoppingCartPackagesQuery : IRequest<Result<ShoppingCartPackage[]>>
+{
+    public Guid ShoppingCartId { get; set; }
+
+    private GetShoppingCartPackagesQuery(Guid shoppingCartId) => ShoppingCartId = shoppingCartId;
+
+    public static GetShoppingCartPackagesQuery Create(Guid shoppingCartId)
+    {
+        if (shoppingCartId == Guid.Empty)
+            throw new ArgumentException("Shopping cart id is required", nameof(shoppingCartId));
+
+        return new(shoppingCartId);
+    }
+}

LiteCharms.Features/ShoppingCarts/Queries/Handlers/GetShoppingCartPackagesQueryHandler.cs

@@ -0,0 +1,32 @@
+using LiteCharms.Extensions;
+using LiteCharms.Infrastructure.Database;
+using LiteCharms.Models;
+
+namespace LiteCharms.Features.ShoppingCarts.Queries.Handlers;
+
+public class GetShoppingCartPackagesQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetShoppingCartPackagesQuery, Result<ShoppingCartPackage[]>>
+{
+    public async ValueTask<Result<ShoppingCartPackage[]>> Handle(GetShoppingCartPackagesQuery request, CancellationToken cancellationToken)
+    {
+        try
+        {
+            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);
+
+            if (!await context.ShoppingCarts.AnyAsync(c => c.Id == request.ShoppingCartId, cancellationToken))
+                return Result.Fail($"Shopping cart could not be found by ID {request.ShoppingCartId}");
+
+            var packages = await context.ShoppingCartPackages.AsNoTracking()
+                .OrderByDescending(o => o.CreatedAt)
+                .Where(cp => cp.ShoppingCartId == request.ShoppingCartId)
+                .ToArrayAsync(cancellationToken);
+
+            return packages?.Length > 0
+                ? Result.Ok(packages.Select(p => p.ToModel()).ToArray())
+                : Result.Fail($"Could not find packaged in shopping cart by ID {request.ShoppingCartId}");
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail<ShoppingCartPackage[]>(new Error(ex.Message).CausedBy(ex));
+        }
+    }
+}