New: Rewrite of download decision engine.

NzbDrone.Core/Providers/DecisionEngine/AcceptableSizeSpecification.cs

@@ -0,0 +1,66 @@
+using System.Linq;
+using NLog;
+using Ninject;
+using NzbDrone.Core.Model;
+
+namespace NzbDrone.Core.Providers.DecisionEngine
+{
+    public class AcceptableSizeSpecification
+    {
+        private readonly QualityTypeProvider _qualityTypeProvider;
+        private readonly EpisodeProvider _episodeProvider;
+        private static readonly Logger logger = LogManager.GetCurrentClassLogger();
+
+        [Inject]
+        public AcceptableSizeSpecification(QualityTypeProvider qualityTypeProvider, EpisodeProvider episodeProvider)
+        {
+            _qualityTypeProvider = qualityTypeProvider;
+            _episodeProvider = episodeProvider;
+        }
+
+        public AcceptableSizeSpecification()
+        {
+            
+        }
+
+        public virtual bool IsSatisfiedBy(EpisodeParseResult subject)
+        {
+            var qualityType = _qualityTypeProvider.Get((int)subject.Quality.QualityType);
+
+            //Need to determine if this is a 30 or 60 minute episode
+            //Is it a multi-episode release?
+            //Is it the first or last series of a season?
+
+            //0 will be treated as unlimited
+            if (qualityType.MaxSize == 0)
+                return true;
+
+            var maxSize = qualityType.MaxSize.Megabytes();
+            var series = subject.Series;
+
+            //Multiply maxSize by Series.Runtime
+            maxSize = maxSize * series.Runtime;
+
+            //Multiply maxSize by the number of episodes parsed (if EpisodeNumbers is null it will be treated as a single episode)
+            //TODO: is this check really necessary? shouldn't we blowup?
+            if (subject.EpisodeNumbers != null)
+                maxSize = maxSize * subject.EpisodeNumbers.Count;
+
+            //Check if there was only one episode parsed
+            //and it is the first or last episode of the season
+            if (subject.EpisodeNumbers != null && subject.EpisodeNumbers.Count == 1 &&
+                _episodeProvider.IsFirstOrLastEpisodeOfSeason(series.SeriesId,
+                subject.SeasonNumber, subject.EpisodeNumbers[0]))
+            {
+                maxSize = maxSize * 2;
+            }
+
+            //If the parsed size is greater than maxSize we don't want it
+            if (subject.Size > maxSize)
+                return false;
+
+            return true;
+        }
+       
+    }
+}