components/LiteCharms.Features/Shop/CartPackages/Queries/Handlers/GetPackageItemsQueryHandler.cs

using LiteCharms.Extensions;
using LiteCharms.Features.Shop.CartPackages.Models;
using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.CartPackages.Queries.Handlers;

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

            if (!await context.Packages.AnyAsync(p => p.Id == request.PackageId, cancellationToken))
                return Result.Fail<PackageItem[]>($"Package could not be found with ID {request.PackageId}");

            var items = await context.PackageItems.AsNoTracking()
                .OrderByDescending(o => o.CreatedAt)
                .Where(p => p.PackageId == request.PackageId)
                .ToArrayAsync(cancellationToken);

            return items?.Length > 0
                ? Result.Ok(items.Select(i => i.ToModel()).ToArray())
                : Result.Fail<PackageItem[]>($"Could not find package items by package ID {request.PackageId}");
        }
        catch (Exception ex)
        {
            return Result.Fail<PackageItem[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}