LibraryApp/LibraryApp.Domain/Entities/Shelf.cs

namespace LibraryApp.Domain.Entities;

public class Shelf
{
    public ShelfId Id { get; private set; }
    public ShelfName Name { get; private set; }
    public DateTime? LastCountedAt { get; private set; }

    public Shelf(ShelfName name)
        : this(new ShelfId(string.Empty), name, null)
    { }

    public Shelf(ShelfId id, ShelfName name, DateTime? lastCountedAt)
    {
        Id = id;
        Name = name;
        LastCountedAt = lastCountedAt;
    }

    public Shelf RecordCount()
    {
        LastCountedAt = DateTime.UtcNow;
        return this;
    }
}

public record ShelfId : DbId
{
    public ShelfId(string id) : base(id) {}
}

public record ShelfName
{
    public string Name { get; init; }

    public ShelfName(string name)
    {
        if(string.IsNullOrWhiteSpace(name))
        {
            throw new ArgumentException("Shelf name cannot be empty.");
        }
        Name = name;
    }
}