using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;

namespace Volian.Base.Library
{
	[Serializable()]
	public class BigNum
	{
		#region fields
		private SortedDictionary<uint, ulong> _MyValue = new SortedDictionary<uint, ulong>();
		private const ulong one = 1;
		private SortedDictionary<uint, ulong> MyValue
		{
			get { return _MyValue; }
			set { _MyValue = value; }
		}
		#endregion
		#region constructors
		public BigNum()
		{
		}
        public BigNum(int value) => SetFlag(value);
        public BigNum(string values) => SetFlags(values);
        public BigNum(ICollection<int> values) => SetFlags(values);
        public override string ToString()
		{
			return FlagList;
		}
		#endregion
		#region operators
		public static BigNum operator |(BigNum bn1, BigNum bn2)
		{
			BigNum bn = new BigNum(bn1.GetFlags());
			bn.SetFlags(bn2.GetFlags());
			return bn;
		}
		public static BigNum operator &(BigNum bn1, BigNum bn2)
		{
			BigNum bn = new BigNum(0);
			foreach (uint k1 in bn1.MyValue.Keys)
			{
				if (bn2.MyValue.ContainsKey(k1) && (bn1.MyValue[k1] & bn2.MyValue[k1]) != 0)
					bn.MyValue[k1] = (bn1.MyValue[k1] & bn2.MyValue[k1]);
			}
			return bn;
		}
		#endregion
		#region methods
		public bool Includes(BigNum other)
		{
			List<int> mine = GetFlags();
			if (mine.Count == 0) return true;
			List<int> yours = other.GetFlags();
			if (yours.Count == 0) return false;
			foreach (int y in yours)
				if (mine.Contains(y)) return false;
			return true;
		}
		public void SetFlags(string values)
		{
			if (values == string.Empty) return;
			string[] myvalues = values.Split(',');
			foreach (string v in myvalues)
				SetFlag(int.Parse(v));
		}
		public List<int> GetFlags()
		{
			List<int> myints = new List<int>();
				foreach (uint key in MyValue.Keys)
				{
					ulong y = MyValue[key];
					for (int i = 0; i < 64; i++)
					{
						if (((y >> i) & one) == one)
							myints.Add((int)(i + (key * 64)));
					}
				}
			return myints;
		}
		public void SetFlag(int flag)
		{
				uint offset = (uint)(flag / 64);
				ulong x = one << (flag % 64);
				if (MyValue.ContainsKey(offset))
					MyValue[offset] |= x;
				else
					MyValue.Add(offset, x);
			//}
		}
		public void SetFlags(ICollection<int> flags)
		{
			foreach (int f in flags)
				SetFlag(f);
		}
        public static BigNum MakeBigNum(string numbers) => numbers == "-1" ? null : new BigNum(numbers);
        #endregion
        #region properties
        [XmlAttribute]
		public string FlagList
		{
			get
			{
				StringBuilder sb = new StringBuilder();
				string sep = "";
				foreach (int i in GetFlags())
				{
					sb.Append(sep + i.ToString());
					sep = ",";
				}
				return sb.ToString();
			}
			set { SetFlags(value); }
		}
		#endregion
	}
}