using System;
using System.Collections;
using System.Linq;

namespace BITKit
{
    public static class MathO
    {
	    public static T As<T>(this object self)
        {
            // {
            //     if (typeof(T) == typeof(object[]))
            //     {
            //         var o = new object[1];
            //         o[0] = self;
            //         return o as T;
            //     }
            // }
            // {
            //     if (self is object[] { Length: 1 } o)
            //     {
            //         return o[0] as T;
            //     }
            // }
            try
            {
                return (T)self;
            }
            catch (InvalidCastException)
            {
                if(self.GetType().IsArray && typeof(T).IsArray && self is IEnumerable enumerable)
                {
                    var newArray = Array.CreateInstance(typeof(T).GetElementType()!, enumerable.Cast<object>().Count());
                    var i = 0;
                    foreach (var x in enumerable)
                    {
                        newArray.SetValue(x, i++);
                    }
                    if (newArray is T newValue)
                    {
                        return newValue;
                    }
                }
                throw;
            }
           
        }
    }
}