MyBookmark/Modules.Rating.Api/Querirs/ObjectRatingQuery.cs

using MediatR;
using Modules.Rating.Api.Database.Entities;
using Modules.Rating.Api.Repositories;

namespace Modules.Rating.Api.Querirs;

public class ObjectRatingQuery : IRequest<Models.Rate?>
{
    public Guid ObjectId { get; set; } = default!;
    public Guid? SubjectId { get; set; }
}

public class ObjectRatingQueryHandler(RateRepository repository) : IRequestHandler<ObjectRatingQuery, Models.Rate?>
{
    public async Task<Models.Rate?> Handle(ObjectRatingQuery request, CancellationToken cancellationToken)
    {
        var rate = await repository.GetAverageObjectRate(request.ObjectId);

        var subjectRate = request.SubjectId.HasValue
            ? await repository.GetFirstOrDefaultWhere(q => q.Key == new RateKey
                {
                    ObjectId = request.ObjectId,
                    SubjectId = request.SubjectId.HasValue ? request.SubjectId.Value : q.Key.SubjectId,
                })
            : null;

        return rate.HasValue
            ? new Models.Rate
            {
                ObjectId = request.ObjectId,
                //SubjectId = request.SubjectId,
                ObjectRatePercentage = (ushort)Math.Round((decimal)rate, 0),
                SubjectRatePercentage = subjectRate?.RatePercentage,
            }
            : null;
    }
}