using System;

namespace SteamWare
{
    /// <summary>
    /// classe con funzioni specifiche di calcolo
    /// </summary>
    public class calcoli
    {
        /// <summary>
        /// inizializzazione classe
        /// </summary>
        protected calcoli()
        {
        }
        /// <summary>
        /// elenco dei caratteri base 36: 0..9A..Z
        /// </summary>
        protected String baseCharList = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        /// <summary>
        /// converte un intero in un numero a base 36 (0..9A..Z)
        /// </summary>
        /// <param name="num">num intero da convertire</param>
        /// <param name="nBase">base, max 36 (0..9A..Z)</param>
        /// <returns></returns>
        public String ConvertToBase(int num, int nBase)
        {

            // check if we can convert to another base
            if (nBase < 2 || nBase > baseCharList.Length)
                return "";

            int r;
            String newNumber = "";

            // in r we have the offset of the char that was converted to the new base
            while (num >= nBase)
            {
                r = num % nBase;
                newNumber = baseCharList[r] + newNumber;
                num = num / nBase;
            }
            // the last number to convert
            newNumber = baseCharList[num] + newNumber;

            return newNumber;
        }
        /// <summary>
        /// converte da base di dimensione nBase a valore intero
        /// </summary>
        /// <param name="valore">valore in formato nBase</param>
        /// <param name="nBase">base, max 36 (0..9A..Z)</param>
        /// <returns></returns>
        public int ConvertFromBase(string valore, int nBase)
        {
            int answ = 0;
            int moduloPos = 0;
            int valorePos = 0;
            if (nBase < 2 || nBase > baseCharList.Length)
                return answ; // errore di base...

            // percorro il mio vaore string e ri-compongo il numero INT...
            for (int i = 0; i < valore.Length; i++)
            {
                // converto il valore in formato nBase in valore intero da moltiplcare x la base...
                moduloPos = baseCharList.IndexOf(valore[valore.Length - i - 1]);
                valorePos = Convert.ToInt32(Math.Pow(Convert.ToDouble(nBase), Convert.ToDouble(i)));
                // leggo da sx con potenze crescenti della base
                answ = answ + valorePos * moduloPos;
            }
            return answ;
        }

        /// <summary>
        /// metodo di accesso singleton
        /// </summary>
        public static calcoli obj = new calcoli();
    }

}