Add Get queries for variants and categories

src/Printbase.Application/Products/Handlers/GetCategoriesHandler.cs

@@ -0,0 +1,40 @@
+using MediatR;
+using Printbase.Application.Products.Dtos;
+using Printbase.Application.Products.Queries;
+
+namespace Printbase.Application.Products.Handlers;
+
+public class GetCategoriesHandler(IUnitOfWork unitOfWork)
+    : IRequestHandler<GetCategoriesQuery, IEnumerable<CategoryDto>>
+{
+    public async Task<IEnumerable<CategoryDto>> Handle(GetCategoriesQuery request, CancellationToken cancellationToken)
+    {
+        IEnumerable<Domain.Entities.Product.Category> categories;
+
+        if (request.RootCategoriesOnly)
+        {
+            categories = await unitOfWork.CategoryRepository.GetRootCategoriesAsync(cancellationToken);
+        }
+        else if (request.IsActive.HasValue && request.IsActive.Value)
+        {
+            categories = await unitOfWork.CategoryRepository.GetActiveAsync(cancellationToken);
+        }
+        else
+        {
+            categories = await unitOfWork.CategoryRepository.GetAllAsync(cancellationToken);
+        }
+
+        return categories.Select(c => new CategoryDto
+        {
+            Id = c.Id,
+            Name = c.Name,
+            Description = c.Description,
+            ImageUrl = c.ImageUrl,
+            SortOrder = c.SortOrder,
+            IsActive = c.IsActive,
+            ParentCategoryId = c.ParentCategoryId,
+            CreatedAt = c.CreatedAt,
+            ModifiedAt = c.ModifiedAt
+        });
+    }
+}

src/Printbase.Application/Products/Handlers/GetProductVariantsHandler.cs

@@ -0,0 +1,62 @@
+using MediatR;
+using Printbase.Application.Products.Dtos;
+using Printbase.Application.Products.Queries;
+
+namespace Printbase.Application.Products.Handlers;
+
+public class GetProductVariantsHandler(IUnitOfWork unitOfWork)
+    : IRequestHandler<GetProductVariantsQuery, IEnumerable<ProductVariantDto>>
+{
+    public async Task<IEnumerable<ProductVariantDto>> Handle(GetProductVariantsQuery request, CancellationToken cancellationToken)
+    {
+        IEnumerable<Domain.Entities.Product.ProductVariant> variants;
+
+        if (request.ProductId.HasValue)
+        {
+            if (request.InStockOnly)
+            {
+                variants = await unitOfWork.ProductVariantRepository.GetInStockByProductIdAsync(request.ProductId.Value, cancellationToken);
+            }
+            else if (request.IsActive.HasValue && request.IsActive.Value)
+            {
+                variants = await unitOfWork.ProductVariantRepository.GetActiveByProductIdAsync(request.ProductId.Value, cancellationToken);
+            }
+            else
+            {
+                variants = await unitOfWork.ProductVariantRepository.GetByProductIdAsync(request.ProductId.Value, cancellationToken);
+            }
+        }
+        else
+        {
+            variants = new List<Domain.Entities.Product.ProductVariant>();
+        }
+
+        return variants.Select(pv => new ProductVariantDto
+        {
+            Id = pv.Id,
+            ProductId = pv.ProductId,
+            Size = pv.Size,
+            Color = pv.Color,
+            Price = pv.Price,
+            ImageUrl = pv.ImageUrl,
+            Sku = pv.Sku,
+            StockQuantity = pv.StockQuantity,
+            IsActive = pv.IsActive,
+            Product = new ProductDto
+            {
+                Id = pv.Product.Id,
+                Name = pv.Product.Name,
+                Description = pv.Product.Description,
+                BasePrice = pv.Product.BasePrice,
+                IsCustomizable = pv.Product.IsCustomizable,
+                IsActive = pv.Product.IsActive,
+                ImageUrl = pv.Product.ImageUrl,
+                CategoryId = pv.Product.CategoryId,
+                CreatedAt = pv.Product.CreatedAt,
+                ModifiedAt = pv.Product.ModifiedAt
+            },
+            CreatedAt = pv.CreatedAt,
+            ModifiedAt = pv.ModifiedAt
+        });
+    }
+}

src/Printbase.Application/Products/Queries/GetCategoriesQuery.cs

@@ -0,0 +1,10 @@
+using MediatR;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.Application.Products.Queries;
+
+public class GetCategoriesQuery : IRequest<IEnumerable<CategoryDto>>
+{
+    public bool? IsActive { get; set; }
+    public bool RootCategoriesOnly { get; set; } = false;
+}

src/Printbase.Application/Products/Queries/GetProductVariantsQuery.cs

@@ -0,0 +1,11 @@
+using MediatR;
+using Printbase.Application.Products.Dtos;
+
+namespace Printbase.Application.Products.Queries;
+
+public class GetProductVariantsQuery : IRequest<IEnumerable<ProductVariantDto>>
+{
+    public Guid? ProductId { get; set; }
+    public bool? IsActive { get; set; }
+    public bool InStockOnly { get; set; } = false;
+}