using JetBrains.Annotations;

namespace VberZero.Tools;

public static class CollectionExtensions
{
    public static IList<T> RemoveAll<T>([NotNull] this ICollection<T> source, Func<T, bool> predicate)
    {
        var items = source.Where(predicate).ToList();

        foreach (var item in items)
        {
            source.Remove(item);
        }

        return items;
    }

    public static bool Empty<T>(this ICollection<T> source)
    {
        if (source != null)
            return source.Count <= 0;
        return true;
    }

    public static bool NotEmpty<T>(this ICollection<T> source)
    {
        return !Empty(source);
    }

    public static bool IsNullOrEmpty<T>(this ICollection<T> source)
    {
        if (source != null)
            return source.Count <= 0;
        return true;
    }

    public static bool AddIfNotContains<T>(this ICollection<T> source, T item)
    {
        if (source == null)
            throw new ArgumentNullException(nameof(source));
        if (source.Contains(item))
            return false;
        source.Add(item);
        return true;
    }
}