using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;

namespace splitDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var stopWatch = new Stopwatch();
            stopWatch.Start();


            var mainFilePath = "C:/Users/ddelev/Downloads/weekly_snapshot_2608.csv";
            var partsDirectory = "C:/Users/ddelev/Downloads/parts";
            var filesCount = 10;

            var lines = new List<string>();

            using (StreamReader sr = new StreamReader(mainFilePath))
            {
                string line;

                while ((line = sr.ReadLine()) != null)
                {
                    lines.Add(line);
                }
            }

            var fileCounter = 1;
            var linesPerFile = lines.Count / filesCount;
            var currEndLine = linesPerFile;

            var stream = new StreamWriter($"{partsDirectory}/part{fileCounter}.csv");

            for (int row = 0; row < lines.Count; row++)
            {
                //stream.WriteLine(Regex.Replace(lines[row], @"[\n\r\t]", ""));
                stream.WriteLine(lines[row]);

                if (row == currEndLine - 1 && fileCounter < 10)
                {
                    Console.WriteLine(currEndLine);
                    fileCounter++;

                    if (fileCounter == 10)
                    {
                        currEndLine = lines.Count;
                    }
                    else
                    {
                        currEndLine += linesPerFile;
                    }
                    stream.Close();
                    stream = new StreamWriter($"{partsDirectory}/part{fileCounter}.csv");
                }
            }
            stream.Close();

            stopWatch.Stop();
            Console.WriteLine(stopWatch.Elapsed);
        }
    }
}