Kavita/API/Entities/Library.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using API.Entities.Enums;
using API.Entities.Interfaces;

namespace API.Entities;

public class Library : IEntityDate
{
    public int Id { get; set; }
    public string Name { get; set; }
    /// <summary>
    /// Update this summary with a way it's used, else let's remove it.
    /// </summary>
    [Obsolete("This has never been coded for. Likely we can remove it.")]
    public string CoverImage { get; set; }
    public LibraryType Type { get; set; }
    public DateTime Created { get; set; }
    public DateTime LastModified { get; set; }
    /// <summary>
    /// Last time Library was scanned
    /// </summary>
    /// <remarks>Time stored in UTC</remarks>
    public DateTime LastScanned { get; set; }
    public ICollection<FolderPath> Folders { get; set; }
    public ICollection<AppUser> AppUsers { get; set; }
    public ICollection<Series> Series { get; set; }

    // Methods
    /// <summary>
    /// Has there been any modifications to the FolderPath's directory since the <see cref="FolderPath.LastScanned"/> date
    /// </summary>
    /// <returns></returns>
    public bool AnyModificationsSinceLastScan()
    {
        // NOTE: I don't think we can do this due to NTFS
        return Folders.All(folder => File.GetLastWriteTimeUtc(folder.Path) > folder.LastScanned);
    }

}