ErsatzTV/ErsatzTV.Core/Plex/PlexLibraryScanner.cs

using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Interfaces.Repositories;
using Microsoft.Extensions.Logging;

namespace ErsatzTV.Core.Plex;

public abstract class PlexLibraryScanner
{
    private readonly ILogger<PlexLibraryScanner> _logger;
    private readonly IMetadataRepository _metadataRepository;

    protected PlexLibraryScanner(IMetadataRepository metadataRepository, ILogger<PlexLibraryScanner> logger)
    {
        _metadataRepository = metadataRepository;
        _logger = logger;
    }

    protected async Task<bool> UpdateArtworkIfNeeded(
        Domain.Metadata existingMetadata,
        Domain.Metadata incomingMetadata,
        ArtworkKind artworkKind)
    {
        if (incomingMetadata.DateUpdated > existingMetadata.DateUpdated)
        {
            Option<Artwork> maybeIncomingArtwork = Optional(incomingMetadata.Artwork).Flatten()
                .Find(a => a.ArtworkKind == artworkKind);

            if (maybeIncomingArtwork.IsNone)
            {
                existingMetadata.Artwork ??= new List<Artwork>();
                existingMetadata.Artwork.RemoveAll(a => a.ArtworkKind == artworkKind);
                await _metadataRepository.RemoveArtwork(existingMetadata, artworkKind);
            }

            foreach (Artwork incomingArtwork in maybeIncomingArtwork)
            {
                _logger.LogDebug("Refreshing Plex {Attribute} from {Path}", artworkKind, incomingArtwork.Path);

                Option<Artwork> maybeExistingArtwork = Optional(existingMetadata.Artwork).Flatten()
                    .Find(a => a.ArtworkKind == artworkKind);

                if (maybeExistingArtwork.IsNone)
                {
                    existingMetadata.Artwork ??= new List<Artwork>();
                    existingMetadata.Artwork.Add(incomingArtwork);
                    await _metadataRepository.AddArtwork(existingMetadata, incomingArtwork);
                }

                foreach (Artwork existingArtwork in maybeExistingArtwork)
                {
                    existingArtwork.Path = incomingArtwork.Path;
                    existingArtwork.DateUpdated = incomingArtwork.DateUpdated;
                    await _metadataRepository.UpdateArtworkPath(existingArtwork);
                }
            }

            return true;
        }

        return false;
    }
}