using System;
using System.IO;
using System.IO.Compression;
using System.Text.RegularExpressions;
using System.Configuration;
using System.Collections.Specialized;
using System.Management;
using System.Xml;

namespace zip
{




    public class Program
    {



        public static void Main()
        {

            string directoryPath = @"C:\Projects\Test\ConsoleApplication1\ConsoleApplication1";

            DirectoryInfo directorySelected = new DirectoryInfo(directoryPath);

            foreach (FileInfo fileToDecompress in directorySelected.GetFiles("*.gz"))
            {
                Console.WriteLine(DateTime.Now);
                Decompress(fileToDecompress);
                Console.WriteLine(DateTime.Now);
            }
        }

        public struct PatternReplacement
        {
            public String Pattern;
            public String Replacement;
        }

        public static String RemoveUnusedInfo(String InputString, Int32[] Columns, PatternReplacement[] PatternReplacementStructure)
        {
            String[] OutputStrings = InputString.Split(new Char[] { '|' });
            String OutputString = "";

            foreach (Int32 column in Columns)
            {
                OutputString = OutputString + "|" + OutputStrings[column];
            }
            OutputString = OutputString.Remove(0, 1);

            foreach (PatternReplacement pr in PatternReplacementStructure)
            {
                Regex rgx = new Regex(pr.Pattern);
                OutputString = rgx.Replace(OutputString,pr.Replacement);
            }

            return OutputString;
        }

        public static void Decompress(FileInfo fileToDecompress)
        {
            using (FileStream originalFileStream = fileToDecompress.OpenRead())
            {
                string currentFileName = fileToDecompress.FullName;
                string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length);

                using (StreamWriter decompressedFileStream = new StreamWriter(newFileName))
                {
                    using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
                    {
                        String read_line, write_line;
                        StreamReader reader = new StreamReader(decompressionStream);

                        Int32[] Columns = {0, 1, 3, 4, 5, 13, 25, 27, 30};
                        
                        PatternReplacement pr;

                        pr.Pattern = @"\[(([2-9]~)|(\d\d+~))(-?\d*(\.\d+)?~0?(\.0+)?)(~\d+)?\]";
                        pr.Replacement = @"";

                        PatternReplacement[] PR = new PatternReplacement[1];
                        PR[0] = pr;

                        while ((read_line = reader.ReadLine()) != null)
                        {
                            write_line = RemoveUnusedInfo(read_line, Columns, PR);
                            decompressedFileStream.WriteLine(write_line);   
                        }
                        Console.WriteLine("Decompressed: {0}", fileToDecompress.Name);
                    }
                }
            }
        }
    }
}