using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.Tar;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading;

namespace DataClients
{
	public class FileClient
	{
		//private char split = '/';
    private char split = '\\';
		private string dir = @"Y:\data";
		//private string dir = @"C:\data";
		//private string dir = @"/archive_rmt/data";

		public FileClient()
		{
			TempDir.StartCkeckDir();
		}
		public FileClient(string directory)
		{
			TempDir.StartCkeckDir();
			dir = directory;
		}

		public byte[] GetFile(DateTime time, ushort vdp, ushort index)
		{
			var name = time.ToString("yyyyMMdd") + "." + vdp.ToString("D2") + index.ToString("D1");
			var tmpFileName = TempDir.GetTempDirectory() + split + name;

			if (!TempDir.IsExist(name))
			{
				if (!CheckArchive(time, vdp)) return new byte[0];
				if (!ExtractArchive(time, vdp)) return new byte[0];
			}
			if (!TempDir.IsExist(name)) return new byte[0];
			while (TempDir.IsProtect(name)) Thread.Sleep(1000);
			TempDir.AddProtect(name);
			Stream fs = File.OpenRead(tmpFileName);
			var result = new List<byte>();
			try
			{
				for (var i = 0; i < fs.Length; i++)
					result.Add((byte)fs.ReadByte());
				return result.ToArray();
			}
			catch (Exception e)
			{
				Console.WriteLine(e.Message);
				Console.WriteLine(e.StackTrace);
				return new byte[0];
			}
			finally
			{
				TempDir.RemoveProtect(name);
				fs.Close();
			}
		}

		private bool CheckArchive(DateTime time, ushort vdp)
		{
			var tmp =
				dir + split +
				time.Year.ToString("D4") + split +
				time.Month.ToString("D2") + split +
				time.Day.ToString("D2") + split +
				vdp.ToString("D2");
			return (File.Exists(tmp + ".tar") || File.Exists(tmp + ".tar.gz"));
		}
		private bool ExtractArchive(DateTime time, ushort vdp)
		{
			var tmp =
				dir + split +
				time.Year.ToString("D4") + split +
				time.Month.ToString("D2") + split +
				time.Day.ToString("D2") + split +
				vdp.ToString("D2");
			if (File.Exists(tmp + ".tar"))
			{
				ExtractTar(tmp + ".tar", TempDir.GetTempDirectory());
				return true;
			}
			else if (File.Exists(tmp + ".tar.gz"))
			{
				ExtractTarGZ(tmp + ".tar.gz", TempDir.GetTempDirectory());
				return true;
			}
			return false;
		}
		private void ExtractTarGZ(String gzArchiveName, String destFolder)
		{
			Stream inStream = File.OpenRead(gzArchiveName);
			Stream gzipStream = new GZipInputStream(inStream);
			try
			{
				TarArchive tarArchive = TarArchive.CreateInputTarArchive(gzipStream);
				tarArchive.ExtractContents(destFolder);
				tarArchive.Close();
			}
			catch (Exception e)
			{
				Console.WriteLine("Can't extract: " + gzArchiveName);
				Console.WriteLine(e.Message);
				Console.WriteLine(e.StackTrace);
			}
			finally
			{
				gzipStream.Close();
				inStream.Close();
			}
		}
		private void ExtractTar(String tarFileName, String destFolder)
		{
			Stream inStream = File.OpenRead(tarFileName);
			try
			{
				TarArchive tarArchive = TarArchive.CreateInputTarArchive(inStream);
				tarArchive.ExtractContents(destFolder);
				tarArchive.Close();
			}
			catch (Exception e)
			{
				Console.WriteLine("Can't extract: " + tarFileName);
				Console.WriteLine(e.Message);
				Console.WriteLine(e.StackTrace);
			}
			finally
			{
				inStream.Close();
			}
		}
	}
}