/******************************************************
 *     ROMVault2 is written by Gordon J.              *
 *     Contact gordon@romvault.com                    *
 *     Copyright 2014                                 *
 ******************************************************/

using System;
using System.Xml;

namespace ROMVault2.Utils
{
    public static class VarFix
    {
        public static bool StringYesNo(string b)
        {
            return b != null && ((b.ToLower() == "yes") || (b.ToLower() == "true"));
        }

        public static ulong? ULong(XmlNode n)
        {
            return ULong(n == null ? "" : n.InnerText);
        }

        public static ulong? ULong(string n)
        {
            if (string.IsNullOrEmpty(n))
                return null;

            if (n == "-")
                return null;

            try
            {
                if (n.Length >= 2 && n.Substring(0, 2).ToLower() == "0x")
                {
                    return Convert.ToUInt64(n.Substring(2), 16);
                }

                return Convert.ToUInt64(n);
            }
            catch
            {
                return null;
            }
        }

        public static string String(XmlNode n)
        {
            return String(n == null ? "" : n.InnerText);
        }
        public static string String(string n)
        {
            return n ?? "";
        }


        private const string ValidHexChar = "0123456789abcdef";
        private static string CleanCheck(string crc, int length)
        {
            string retcrc = crc ?? "";
            retcrc = retcrc.ToLower().Trim();

            if (retcrc.Length >= 2 && retcrc.Substring(0, 2).ToLower() == "0x")
                retcrc = retcrc.Substring(2);

            if (retcrc == "-") retcrc="00000000";

            for (int i = 0; i < retcrc.Length; i++)
                if (ValidHexChar.IndexOf(retcrc.Substring(i, 1), StringComparison.Ordinal) < 0)
                    return "";


            retcrc = (new String('0', length)) + retcrc;
            retcrc = retcrc.Substring(retcrc.Length - length);

            return retcrc;
        }


        //CleanMD5SHA1 with a null or empty string will return null
        public static byte[] CleanMD5SHA1(XmlNode n, int length)
        {
            return CleanMD5SHA1(n == null ? null : n.InnerText, length);
        }
        public static byte[] CleanMD5SHA1(string checksum, int length)
        {
            if (string.IsNullOrEmpty(checksum)) return null;

            checksum = checksum.ToLower().Trim();

            if (checksum.Length >= 2)
                if (checksum.Substring(0, 2) == "0x")
                    checksum = checksum.Substring(2);


            if (string.IsNullOrEmpty(checksum)) return null;

            if (checksum == "-") return null;

            //if (checksum.Length % 2 == 1)
            //    checksum = "0" + checksum;

            //if (checksum.Length != length)
            //    return null;

            while (checksum.Length < length)
                checksum = "0" + checksum;

            int retL = checksum.Length / 2;
            byte[] retB = new byte[retL];

            for (int i = 0; i < retL; i++)
                retB[i] = Convert.ToByte(checksum.Substring(i * 2, 2), 16);

            return retB;
        }


        public static string CleanFullFileName(XmlNode n)
        {
            return CleanFullFileName(n == null ? "" : n.InnerText);
        }
        public static string CleanFullFileName(string name)
        {
            if (System.String.IsNullOrEmpty(name)) return "";

            string retName = name;
            retName = retName.TrimStart();
            retName = retName.TrimEnd(new []{ '.', ' ' });

            char[] charName = retName.ToCharArray();
            for (int i = 0; i < charName.Length; i++)
            {
                int c = charName[i];
                if (c == ':' || c == '*' || c == '?' || c == '<' || c == '>' || c == '|' || c < 32)
                    charName[i] = '-';
                else if (c == '\\')
                    charName[i] = '/';
            }
            return new string(charName);
        }

        public static string CleanFileName(XmlNode n)
        {
            return CleanFileName(n == null ? "" : n.InnerText);
        }
        public static string CleanFileName(string name,char crep='-')
        {
            if (System.String.IsNullOrEmpty(name)) return "";
            string retName = name;
            retName = retName.TrimStart();
            retName = retName.TrimEnd(new[] { '.', ' ' });

            char[] charName = retName.ToCharArray();
            for (int i = 0; i < charName.Length; i++)
            {
                int c = charName[i];
                if (c == ':' || c == '*' || c == '?' || c == '<' || c == '>' || c == '|' || c == '\\' || c == '/' || c < 32)
                    charName[i] = crep;
            }
            return new string(charName);
        }

        public static string ToLower(XmlNode n)
        {
            return ToLower(n == null ? "" : n.InnerText);
        }
        public static string ToLower(string name)
        {
            return name == null ? "" : name.ToLower();
        }


        public static string PCombine(string path1, string path2)
        {
            if (System.String.IsNullOrEmpty(path1)) return path2;
            if (System.String.IsNullOrEmpty(path2)) return path1;

            return path1 + "/" + path2;
        }

    }
}