components/LiteCharms.Features/Products/Queries/Handlers/GetProductQueryHandler.cs

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

namespace LiteCharms.Features.Products.Queries.Handlers;

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

            var product = await context.Products.FirstOrDefaultAsync(p => p.Id == request.ProductId, cancellationToken);

            return product is not null
                ? Result.Ok(product.ToModel())
                : Result.Fail<Product>(new Error($"Product with ID {request.ProductId} not found."));
        }
		catch (Exception ex)
		{
            return Result.Fail<Product>(new Error(ex.Message).CausedBy(ex));
        }
    }
}