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

namespace SteamWare
{
  /// <summary>
  /// Classe di metodi che estendono quelli base applicati alle string
  /// </summary>
  public class SteamwareStrings
  {
    /// <summary>
    /// Trasforma in MAIUSCOLo il primo carattere della stringa
    /// </summary>
    /// <param name="_stringaIN">stringa da processare</param>
    /// <returns>stringa processata</returns>
    public static string firstToUpper(string _stringaIN)
    {
      string _stringaOUT = _stringaIN;
      if (_stringaIN.Length > 1)
      {
        _stringaOUT = _stringaIN.Substring(0, 1).ToUpper() + _stringaIN.Substring(1, _stringaIN.Length - 1).ToLower();
      }
      return _stringaOUT;
    }

    /// <summary>
    /// effettua escape di stringhe di ricerca di tipo filtro per apici e altri caratteri non ammessi
    /// </summary>
    /// <param name="s_"></param>
    /// <returns></returns>
    public static string EscapeSqlLike(string s_)
    {
      StringBuilder sb = new StringBuilder(s_.Length);
      for (int i = 0; i < s_.Length; i++)
      {
        char c = s_[i];
        switch (c)
        {
          case ']':
          case '[':
          case '%':
          case '*':
            sb.Append("[").Append(c).Append("]");
            break;
          case '\'':
            sb.Append("''");
            break;
          default:
            sb.Append(c);
            break;
        }
      }
      return sb.ToString();
    }
    /// <summary>
    /// restituisce una stringa uguale all'originale + terminazione newline
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public static string addLine(object s)
    {
      return string.Format("{0}{1}", s, Environment.NewLine);
    }
    /// <summary>
    /// formatta un titolo
    /// </summary>
    /// <param name="title">Titolo da scrivere</param>
    /// <param name="padChar">carattere x padding titolo</param>
    /// <param name="repNum">larghezza caratteri (x pad)</param>
    /// <returns></returns>
    public static string charTitle(object title, char padChar, int repNum)
    {
      string answ = "";
      answ += addLine(new string(padChar, repNum));
      answ += addLine(string.Format("{0} {1}", padChar, title));
      answ += addLine(new string(padChar, repNum));
      return answ;
    }
    /// <summary>
    /// formatta una riga di caratteri
    /// </summary>
    /// <param name="padChar">carattere da utilizzare</param>
    /// <param name="repNum">larghezza caratteri (x pad)</param>
    /// <returns></returns>
    public static string charLine(char padChar, int repNum)
    {
      string answ = "";
      answ += addLine(new string(padChar, repNum));
      return answ;
    }
    /// <summary>
    /// genera stringhe pseudo-casuali
    /// </summary>
    /// <param name="Lenght"></param>
    /// <returns></returns>
    public static string pseudoRandomString(int Lenght)
    {
      string answ = "";
      var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
      var random = new Random();
      answ = new string(
          Enumerable.Repeat(chars, Lenght)
                    .Select(s => s[random.Next(s.Length)])
                    .ToArray());
      return answ;
    }

    /// <summary>
    /// limita una stringa al numero max di caratteri imposto
    /// </summary>
    /// <param name="original"></param>
    /// <param name="maxChar"></param>
    /// <returns></returns>
    public static string limitString(string original, int maxChar)
    {
      string outString = original;
      if (outString.Length > maxChar)
      {
        outString = string.Format("{0}...", original.Substring(0, maxChar - 3));
      }
      return outString;
    }
    /// <summary>
    /// limita una stringa al numero max di caratteri imposto prendendo ANCHE ultimi 
    /// </summary>
    /// <param name="original"></param>
    /// <param name="maxChar"></param>
    /// <param name="lastNumChar"></param>
    /// <returns></returns>
    public static string limitString(string original, int maxChar, int lastNumChar)
    {
      string outString = original;
      if (outString.Length > maxChar)
      {
        outString = string.Format("{0}...{1}", original.Substring(0, maxChar - 3 - lastNumChar), original.Substring(outString.Length - lastNumChar));
      }
      return outString;
    }
  }
}