using Telerik.WinControls.UI;

namespace Pilz.UI.Telerik.Extensions;

public static class RadListDataItemCollectionExtensions
{
    public static IEnumerable<RadListDataItem> AddEnumValues<T>(this RadListDataItemCollection @this) where T : struct, Enum
    {
        return AddEnumValues<T>(@this, false);
    }

    public static IEnumerable<RadListDataItem> AddEnumValues<T>(this RadListDataItemCollection @this, bool clearCollection) where T : struct, Enum
    {
        return AddEnumValues<T>(@this, clearCollection, null, null);
    }

    public static IEnumerable<RadListDataItem> AddEnumValues<T>(this RadListDataItemCollection @this, bool clearCollection, Func<T, bool>? filter, Func<T, string?>? format) where T : struct, Enum
    {
        var values = Enum.GetValues<T>();
        var items = new List<RadListDataItem>();

        format ??= v => Enum.GetName(v);

        if (clearCollection)
            @this.Clear();

        foreach (var value in values)
        {
            if (filter is null || filter(value))
                items.Add(new(format(value), value));
        }

        @this.AddRange(items);

        return items;
    }
}