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

namespace SvnVersionHelper
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Count() == 0 || args.Count() > 1) {
                Console.WriteLine("SvnVersionHelper: invalid arguments (must be path to file)");
                return;
            }
            string file = args[0];
            readfile(file);
        }

        static void readfile(string file)
        {
            Console.WriteLine("SvnVersionHelper: reading {0}", file);

            List<string> builder = new List<string>();
            #region file reader
            using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                StreamReader sr = new StreamReader(fs);
                while (!sr.EndOfStream)
                {
                    string line = sr.ReadLine();
                    if (line.ToLower().Contains("private const string Minor = ".ToLower()))
                    {
                        Console.WriteLine("########## found ########## Minor ###########");
                        Console.WriteLine("{0} (transformed to) ",line);
                        string line2 = line.Replace("private const string Minor = ", "").Trim().Replace(";", "");
                        //Console.WriteLine(line2);

                        string[] shifts = line2.Split('|');
                        List<int> shift_ors = new List<int>();
                        int final_value = 0;
                        foreach (string shift in shifts)
                        {
                            int shift_value = 0;
                            string t_shift = shift.Trim();
                            //Console.Write("shift: {0} = ", t_shift);

                            if (t_shift.Contains("<<"))
                            {
                                string[] shift_registers = t_shift.Split(new string[] { "<<" }, StringSplitOptions.RemoveEmptyEntries);
                                //foreach (string shift_register in shift_registers)
                                //{
                                //    string t_shift_reg = shift_register.Trim();
                                //    Console.WriteLine("    shift reg: {0}", t_shift_reg);
                                //}
                                int shift_t1 = Convert.ToInt32(shift_registers[0].Trim());
                                int shift_t2 = Convert.ToInt32(shift_registers[1].Trim());
                                shift_value = shift_t1 << shift_t2;
                            }
                            else
                            {
                                shift_value = Convert.ToInt32(t_shift);
                            }
                            //Console.Write(shift_value);
                            //Console.WriteLine();
                            shift_ors.Add(shift_value);
                        }

                        foreach (int shift_or in shift_ors)
                        {
                            final_value = final_value | shift_or;
                        }
                        //Console.Write("{0} = ",line2);
                        //Console.Write(final_value);
                        //Console.WriteLine();
                        string replace = string.Format("\"{0}\"", final_value.ToString());
                        Console.WriteLine("{0}", line.Replace(line2,replace));
                        line = line.Replace(line2, replace);
                    }
                    builder.Add(line);
                }
                sr.Close();
            }
            #endregion

            using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write, FileShare.Read))
            {
                StreamWriter sw = new StreamWriter(fs);
                sw.AutoFlush = true;
                foreach (string t in builder)
                {
                    sw.WriteLine(t);
                }
                sw.Close();
            }
        }
    }
}