using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Cosmos.Common.Extensions {
    public static class ToHexString {

        //TODO: Can add several more overloads for other numbertypes, with and without width argument.

        public static string ToHex(this byte n) {
            return ConvertToHex((UInt32)n, 2);
        }
        public static string ToHex(this byte n, int aWidth) {
            return ConvertToHex((UInt32)n, aWidth);
        }

        public static string ToHex(this int n) {
            return ConvertToHex((UInt32)n);
        }
        public static string ToHex(this int n, int aWidth) {
            return ConvertToHex((UInt32)n, aWidth);
        }

        public static string ToHex(this UInt16 n) {
            return ConvertToHex((UInt32)n, 4);
        }
        public static string ToHex(this UInt16 n, int aWidth) {
            return ConvertToHex((UInt32)n, aWidth);
        }

        public static string ToHex(this uint aValue) {
            return ConvertToHex(aValue, 8);
        }
        public static string ToHex(this uint aValue, int aWidth) {
            return ConvertToHex(aValue, aWidth);
        }

        public static string ToHex(this ulong aValue) {
            return ConvertToHex(aValue).PadLeft(16, '0');
        }
        public static string ToHex(this ulong aValue, int aWidth) {
            return ConvertToHex(aValue).PadLeft(aWidth, '0');
        }

        private static string GetPrefix() {
            return "0x";
        }

        private static string GetSuffix() {
            return "h";
        }

        private static string ConvertToHex(UInt32 num) {
            string xHex = string.Empty;

            while (num != 0) {
                //Note; char is converted to string because Cosmos crashes when adding char and string. Frode, 7.june.
                xHex = SingleDigitToHex((byte)(num & 0xf)) + xHex;
                num = num >> 4;
            }

            return xHex;
        }

        private static string ConvertToHex(UInt32 aValue, int aWidth) {
            return ConvertToHex(aValue).PadLeft(aWidth, '0');
        }


        private static string ConvertToHex(UInt64 num) {
            string xHex = string.Empty;

            while (num != 0) {
                //Note; char is converted to string because Cosmos crashes when adding char and string. Frode, 7.june.
                xHex = SingleDigitToHex((byte)(num & 0xf)) + xHex;
                num = num >> 4;
            }

            return xHex;
        }

        public static string SingleDigitToHex(byte d) {
            switch (d) {
                case 0:
                    return "0";
                case 1:
                    return "1";
                case 2:
                    return "2";
                case 3:
                    return "3";
                case 4:
                    return "4";
                case 5:
                    return "5";
                case 6:
                    return "6";
                case 7:
                    return "7";
                case 8:
                    return "8";
                case 9:
                    return "9";
                case 10:
                    return "A";
                case 11:
                    return "B";
                case 12:
                    return "C";
                case 13:
                    return "D";
                case 14:
                    return "E";
                case 15:
                    return "F";
            }
            return " ";

        }

    }
}