Nexus.Reader/src/NexusReader.Domain/Entities/Book.cs

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace NexusReader.Domain.Entities;

/// <summary>
/// Represents a Book metadata entry that references its decoupled revisions.
/// </summary>
public class Book
{
    [Key]
    public Guid Id { get; set; } = Guid.NewGuid();

    [Required]
    [MaxLength(255)]
    public string Title { get; set; } = string.Empty;

    [Required]
    [MaxLength(128)]
    public string TenantId { get; set; } = "global";

    [Required]
    public string UserId { get; set; } = string.Empty;

    [ForeignKey(nameof(UserId))]
    public virtual NexusUser? User { get; set; }

    public Guid? CurrentDraftRevisionId { get; set; }

    [ForeignKey(nameof(CurrentDraftRevisionId))]
    public virtual BookRevision? CurrentDraftRevision { get; set; }

    public Guid? LivePublishedRevisionId { get; set; }

    [ForeignKey(nameof(LivePublishedRevisionId))]
    public virtual BookRevision? LivePublishedRevision { get; set; }

    public virtual ICollection<BookRevision> Revisions { get; set; } = new List<BookRevision>();
}