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

namespace Test_EnvSetzen
{
    class UgiiEnvParser
    {
		public UgiiEnvParser(string filename)
		{
			ParseUgiiEnv(filename);
		}

		private void ParseUgiiEnv(string filename)
		{
			//ugii_env-Parser
			string line;
			System.IO.StreamReader file = new System.IO.StreamReader(filename);

			string ifValue = "";
			string env = "";
			string value = "";

			while ((line = file.ReadLine()) != null)
			{
				if (line.ToLower().StartsWith("#if"))
				{
					if (line.ToLower().Contains("file"))
					{
						ifValue = ReplaceVariableThroughValue(line.Remove(0, line.ToLower().IndexOf("file") + 5));

						if (File.Exists(ifValue))
						{
							line = file.ReadLine();

							if (line.Contains("="))
							{
								env = line.Remove(line.IndexOf("="));
								value = ReplaceVariableThroughValue(line.Remove(0, line.IndexOf("=") + 1));
								Environment.SetEnvironmentVariable(env, value);
							}

							while ((line = file.ReadLine().ToLower()) != "#endif")
							{
								//Bis zum Ende der If-Anweisung einlesen
							}
						}
						else
						{
							line = file.ReadLine(); //Wertezeile nach der If-Anweisung
							line = file.ReadLine(); //Zeile nach der Wertezeile

							if (line.ToLower() == "else")
							{
								line = file.ReadLine();

								env = line.Remove(line.IndexOf("="));
								value = ReplaceVariableThroughValue(line.Remove(0, line.IndexOf("=") + 1));
								Environment.SetEnvironmentVariable(env, value);
							}
						}
					}
				}
				else
				{
					if (line.Contains("=") & !line.StartsWith("#"))
					{
						env = line.Remove(line.IndexOf("="));
						value = ReplaceVariableThroughValue(line.Remove(0, line.IndexOf("=") + 1));
						Environment.SetEnvironmentVariable(env, value);
					}
				}
			}

			file.Close();
		}

		private string ReplaceVariableThroughValue(string value)
		{
			var rv = new ReplaceVariable();
			return rv.ExtractVariable(value);
		}
	}
}