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

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));
        }
    }
}