components/LiteCharms.Features/ShoppingCarts/Queries/Handlers/GetShoppingCartItemsQueryHandler.cs

using LiteCharms.Extensions;
using LiteCharms.Infrastructure.Database;
using LiteCharms.Models;

namespace LiteCharms.Features.ShoppingCarts.Queries.Handlers;

public class GetShoppingCartItemsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetShoppingCartItemsQuery, Result<ShoppingCartItem[]>>
{
    public async ValueTask<Result<ShoppingCartItem[]>> Handle(GetShoppingCartItemsQuery request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if (!await context.ShoppingCarts.AnyAsync(i => i.Id == request.ShoppingCartId, cancellationToken))
                return Result.Fail($"Shopping cart could not be found with id {request.ShoppingCartId}");

            var items = await context.ShoppingCartItems.AsNoTracking()
                .Where(i => i.ShoppingCartId == request.ShoppingCartId).ToArrayAsync(cancellationToken);

            return items?.Length > 0
                ? Result.Ok(items.Select(i => i.ToModel()).ToArray())
                : Result.Fail<ShoppingCartItem[]>($"Failed to retrieve shopping cart items with id {request.ShoppingCartId}");
        }
		catch (Exception ex)
		{
            return Result.Fail<ShoppingCartItem[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}