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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using NzbDrone.Common;
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using NzbDrone.Common.Extensions;
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using NzbDrone.Core.Books;
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using NzbDrone.Core.Extras.Files;
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namespace NzbDrone.Core.Extras
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{
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public abstract class ImportExistingExtraFilesBase<TExtraFile> : IImportExistingExtraFiles
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where TExtraFile : ExtraFile, new()
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{
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private readonly IExtraFileService<TExtraFile> _extraFileService;
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public ImportExistingExtraFilesBase(IExtraFileService<TExtraFile> extraFileService)
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{
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_extraFileService = extraFileService;
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}
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public abstract int Order { get; }
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public abstract IEnumerable<ExtraFile> ProcessFiles(Author author, List<string> filesOnDisk, List<string> importedFiles);
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public virtual ImportExistingExtraFileFilterResult<TExtraFile> FilterAndClean(Author author, List<string> filesOnDisk, List<string> importedFiles)
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{
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var authorFiles = _extraFileService.GetFilesByAuthor(author.Id);
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Clean(author, filesOnDisk, importedFiles, authorFiles);
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return Filter(author, filesOnDisk, importedFiles, authorFiles);
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}
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private ImportExistingExtraFileFilterResult<TExtraFile> Filter(Author author, List<string> filesOnDisk, List<string> importedFiles, List<TExtraFile> authorFiles)
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{
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var previouslyImported = authorFiles.IntersectBy(s => Path.Combine(author.Path, s.RelativePath), filesOnDisk, f => f, PathEqualityComparer.Instance).ToList();
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var filteredFiles = filesOnDisk.Except(previouslyImported.Select(f => Path.Combine(author.Path, f.RelativePath)).ToList(), PathEqualityComparer.Instance)
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.Except(importedFiles, PathEqualityComparer.Instance)
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.ToList();
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// Return files that are already imported so they aren't imported again by other importers.
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// Filter out files that were previously imported and as well as ones imported by other importers.
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return new ImportExistingExtraFileFilterResult<TExtraFile>(previouslyImported, filteredFiles);
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}
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private void Clean(Author author, List<string> filesOnDisk, List<string> importedFiles, List<TExtraFile> authorFiles)
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{
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var alreadyImportedFileIds = authorFiles.IntersectBy(f => Path.Combine(author.Path, f.RelativePath), importedFiles, i => i, PathEqualityComparer.Instance)
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.Select(f => f.Id);
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var deletedFiles = authorFiles.ExceptBy(f => Path.Combine(author.Path, f.RelativePath), filesOnDisk, i => i, PathEqualityComparer.Instance)
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.Select(f => f.Id);
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_extraFileService.DeleteMany(alreadyImportedFileIds);
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_extraFileService.DeleteMany(deletedFiles);
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}
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}
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}
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