components/LiteCharms.Features/ShoppingCarts/Commands/Handlers/CreateShoppingCartCommandHandler.cs

using LiteCharms.Infrastructure.Database;

namespace LiteCharms.Features.ShoppingCarts.Commands.Handlers;

public class CreateShoppingCartCommandHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<CreateShoppingCartCommand, Result<Guid>>
{
    public async ValueTask<Result<Guid>> Handle(CreateShoppingCartCommand request, CancellationToken cancellationToken)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if (!await context.Customers.AnyAsync(c => c.Id == request.CustomerId, cancellationToken))
                return Result.Fail<Guid>($"Customer could not be found with id {request.CustomerId}");

            var cart = context.ShoppingCarts.Add(new Entities.ShoppingCart
            {
                CustomerId = request.CustomerId,
                OrderId = request.OrderId,
                QuoteId = request.QuoteId
            });

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok(cart.Entity.Id)
                : Result.Fail<Guid>($"Failed to create shopping cart for customer id {request.CustomerId}");
        }
        catch (Exception ex)
        {
            return Result.Fail<Guid>(new Error(ex.Message).CausedBy(ex));
        }
    }
}