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

namespace split
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length == 2)
            {
                string arquivo = args[0];
                string destino = args[1];
                int qtd = 0;

                StreamWriter writer = null;
                try
                {
                    using (StreamReader inputfile = new System.IO.StreamReader(arquivo))
                    {
                        int count = 0;
                        string line;
                        while ((line = inputfile.ReadLine()) != null)
                        {

                            //800.000 linhas
                            if (writer == null || count >= 800000)
                            {
                                count = 0;
                                if (writer != null)
                                {
                                    writer.Close();
                                    writer = null;
                                }

                                writer = new System.IO.StreamWriter(Path.GetDirectoryName(arquivo) + "\\" + Path.GetFileNameWithoutExtension(arquivo) + "_" + qtd.ToString() + ".txt", true);
                                qtd++;
                            }

                            writer.WriteLine(line.ToLower());

                            ++count;
                        }
                    }
                }
                finally
                {
                    if (writer != null)
                        writer.Close();
                    Console.WriteLine("Split concluido.");
                }
            }
            else
            {
                Console.WriteLine("Split diretorio_e_arquivo diretorio_destino");
            }

            Console.WriteLine("Pressione uma tecla para continuar . . .");
            Console.ReadKey();
        }
    }
}