Radarr/src/NzbDrone.Core/DecisionEngine/Specifications/UpgradeDiskSpecification.cs

using System.Linq;
using NLog;
using NzbDrone.Core.IndexerSearch.Definitions;
using NzbDrone.Core.Parser.Model;

namespace NzbDrone.Core.DecisionEngine.Specifications
{
    public class UpgradeDiskSpecification : IDecisionEngineSpecification
    {
        private readonly UpgradableSpecification _qualityUpgradableSpecification;
        private readonly Logger _logger;

        public UpgradeDiskSpecification(UpgradableSpecification qualityUpgradableSpecification, Logger logger)
        {
            _qualityUpgradableSpecification = qualityUpgradableSpecification;
            _logger = logger;
        }

        public SpecificationPriority Priority => SpecificationPriority.Default;
        public RejectionType Type => RejectionType.Permanent;

        public virtual Decision IsSatisfiedBy(RemoteMovie subject, SearchCriteriaBase searchCriteria)
        {
            if (subject.Movie.MovieFile == null)
            {
                return Decision.Accept();
            }

            var file = subject.Movie.MovieFile;
                _logger.Debug("Comparing file quality with report. Existing file is {0}", file.Quality);

                if (!_qualityUpgradableSpecification.IsUpgradable(subject.Movie.Profile, file.Quality, subject.ParsedMovieInfo.Quality))
                {
                    return Decision.Reject("Quality for existing file on disk is of equal or higher preference: {0}", file.Quality);
                }
            

            return Decision.Accept();
        }
    }
}