using ErrorOr;
using Mediator;
using Microsoft.EntityFrameworkCore;
using Musify.Application.Contracts;
using Musify.Application.Shared;
using Musify.Application.Tracks.Responses;

namespace Musify.Application.Tracks
{
    public record GetTrackByIdQuery(Guid TrackId)
        : IQuery<ErrorOr<TrackApplicationResponse>>;

    public class GetTrackByIdQueryHandler(IDatabase database)
        : IQueryHandler<GetTrackByIdQuery, ErrorOr<TrackApplicationResponse>>
    {
        public async ValueTask<ErrorOr<TrackApplicationResponse>> Handle(GetTrackByIdQuery request, CancellationToken cancellationToken)
        {
            var track = await database.Tracks
                .AsNoTracking()
                .Active()
                .Where(t => t.Id == request.TrackId)
                .SelectResponse()
                .SingleOrDefaultAsync(cancellationToken);

            return track == null
                ? AppErrors.NotFound("Track", request.TrackId)
                : track;
        }
    }
}