Initial commit

2021-02-08 21:13:53 -06:00
commit 4d52e115b5
493 changed files with 31399 additions and 0 deletions
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+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.Metadata;
+using ErsatzTV.Core.Interfaces.Repositories;
+using LanguageExt;
+using static LanguageExt.Prelude;
+
+namespace ErsatzTV.Application.MediaItems.Commands
+{
+    public class
+        RefreshMediaItemStatisticsHandler : MediatR.IRequestHandler<RefreshMediaItemStatistics, Either<BaseError, Unit>>
+    {
+        private readonly IConfigElementRepository _configElementRepository;
+        private readonly ILocalStatisticsProvider _localStatisticsProvider;
+        private readonly IMediaItemRepository _mediaItemRepository;
+
+        public RefreshMediaItemStatisticsHandler(
+            IMediaItemRepository mediaItemRepository,
+            IConfigElementRepository configElementRepository,
+            ILocalStatisticsProvider localStatisticsProvider)
+        {
+            _mediaItemRepository = mediaItemRepository;
+            _configElementRepository = configElementRepository;
+            _localStatisticsProvider = localStatisticsProvider;
+        }
+
+        public Task<Either<BaseError, Unit>> Handle(
+            RefreshMediaItemStatistics request,
+            CancellationToken cancellationToken) =>
+            Validate(request)
+                .MapT(RefreshStatistics)
+                .Bind(v => v.ToEitherAsync());
+
+        private async Task<Validation<BaseError, RefreshParameters>> Validate(RefreshMediaItemStatistics request) =>
+            (await MediaItemMustExist(request).BindT(PathMustExist), await ValidateFFprobePath())
+            .Apply((mediaItem, ffprobePath) => new RefreshParameters(mediaItem, ffprobePath));
+
+        private Task<Validation<BaseError, MediaItem>> MediaItemMustExist(
+            RefreshMediaItemStatistics refreshMediaItemStatistics) =>
+            _mediaItemRepository.Get(refreshMediaItemStatistics.MediaItemId)
+                .Map(
+                    maybeItem => maybeItem.ToValidation<BaseError>(
+                        $"[MediaItem] {refreshMediaItemStatistics.MediaItemId} does not exist."));
+
+        private Validation<BaseError, MediaItem> PathMustExist(MediaItem mediaItem) =>
+            Some(mediaItem)
+                .Filter(item => File.Exists(item.Path))
+                .ToValidation<BaseError>($"[Path] '{mediaItem.Path}' does not exist on the file system");
+
+        private Task<Validation<BaseError, string>> ValidateFFprobePath() =>
+            _configElementRepository.GetValue<string>(ConfigElementKey.FFprobePath)
+                .FilterT(File.Exists)
+                .Map(
+                    ffprobePath =>
+                        ffprobePath.ToValidation<BaseError>("FFprobe path does not exist on the file system"));
+
+        private Task<Unit> RefreshStatistics(RefreshParameters parameters) =>
+            _localStatisticsProvider.RefreshStatistics(parameters.FFprobePath, parameters.MediaItem).ToUnit();
+
+        private record RefreshParameters(MediaItem MediaItem, string FFprobePath);
+    }
+}