Libation/Source/DataLayer/EfClasses/Category.cs

using Dinah.Core;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace DataLayer;

public class AudibleCategoryId
{
	public string Id { get; }
	public AudibleCategoryId(string id)
	{
		ArgumentValidator.EnsureNotNullOrWhiteSpace(id, nameof(id));
		Id = id;
	}
}

public class Category
{
	internal int CategoryId { get; private set; }
	public string AudibleCategoryId { get; }

	public string Name { get; }

	internal List<CategoryLadder> _categoryLadders = new();
	private ReadOnlyCollection<CategoryLadder>? _categoryLaddersReadOnly;
	public ReadOnlyCollection<CategoryLadder> CategoryLadders
	{
		get
		{
			if (_categoryLaddersReadOnly?.SequenceEqual(_categoryLadders) is not true)
				_categoryLaddersReadOnly = _categoryLadders.AsReadOnly();
			return _categoryLaddersReadOnly;
		}
	}

#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring as nullable.
	private Category() { }
#pragma warning restore CS8618
	/// <summary>special id class b/c it's too easy to get string order mixed up</summary>
	public Category(AudibleCategoryId audibleSeriesId, string name)
	{
		ArgumentValidator.EnsureNotNull(audibleSeriesId, nameof(audibleSeriesId));
		var id = audibleSeriesId.Id;
		ArgumentValidator.EnsureNotNullOrWhiteSpace(id, nameof(id));
		ArgumentValidator.EnsureNotNullOrWhiteSpace(name, nameof(name));

		AudibleCategoryId = id;
		Name = name;
	}

	public override string ToString() => $"[{AudibleCategoryId}] {Name}";
}