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

namespace Eugen.ESystem.Windows.Forms
{
    public static class FixLineLenght
    {
        /// <summary>
		/// Formats a string with a fixed line length.
		/// </summary>
		static FixLineLenght()
        {
        }

        /// <summary>
        /// Formats a string with a fixed line length.
        /// </summary>
        /// <param name="text">String to be formatted.</param>
        /// <param name="lineLenght">Maximum line length</param>
        /// <returns></returns>
        public static string Format(string text, int lineLenght)
        {
            int pos = 0;
            int spacePos = 0;
            string character = "";
            string temp = "";
            string result = "";

            while (text.Length > 0)
            {
                if (text.Length <= lineLenght)
                {
                    result = String.Concat(result, text);
                    text = "";
                }
                else
                {
                    while (pos <= lineLenght)
                    {
                        character = text.Remove(0, pos).Remove(1);

                        //Bei einem Zeilenumbruch oder Wagenrücklauf eine neu Zeile beginnen
                        if (character == "\n" || character == "\r")
                        {
                            spacePos = text.IndexOf("\n") + 1;
                            break;
                        }

                        if (character == " ")
                        {
                            spacePos = pos + 1;
                        }

                        pos++;
                    }

                    temp = text.Remove(spacePos - 1);
                    if (temp.EndsWith("\n") || temp.EndsWith("\r"))
                    {
                        temp = temp.Remove(temp.Length - 1);// Ein schon enthaltenes '\n' oder '\r' am Ende de temporären Strings muss entfernt werden
                    }
                    text = text.Remove(0, spacePos);
                    result = String.Concat(result, temp, "\r\n");
                    pos = 0;
                    spacePos = 0;
                }
            }

            return result;
        }
    }
}