using System;
using System.IO;
using System.Text;
using System.Diagnostics;

class Script
{
    static string classStart =
        "namespace Scripting\r\n" +
        "{\r\n" +
        "   class ClassLesssSript\r\n" +
        "   {\r\n" +
        "       static public void Main(string[] args)\r\n" +
        "       {\r\n";
    static string classEnd =
        "       }\r\n" +
        "   }\r\n" +
        "}\r\n";

	const string usage = "Usage: cscscript classLess file...\nExecutes C# script file that contains free standing C# code without any class declarations.\n Example: cscscript classLess script.cs\n";

	static public void Main(string[] args)
	{
		if (args.Length == 0 || (args.Length == 1 && (args[0] == "?" || args[0] == "/?" || args[0] == "-?" || args[0].ToLower() == "help")))
		{
			Console.WriteLine(usage);
		}
		else
		{
			if (args.Length > 0)
			{
				string oldFile = ResolveFile(args[0]);
				string newFile = Path.GetTempFileName();
				//if (File.Exist()
					//)
				try
				{
					using (StreamReader sr = new StreamReader(oldFile))
					{
						using (StreamWriter sw = new StreamWriter(newFile))    
						{
							bool header = true;
							bool firstLine = true;
	
							string line;
							while ((line = sr.ReadLine()) != null)
							{
								if (firstLine)
								{
									firstLine = false;
									sw.WriteLine("using System;"); //default "using..."
									if (!line.StartsWith("using ")) //there is no header
									{
										sw.WriteLine(classStart);
										header = false;
									}
								}
	
								if (header && line == "") //end of the header
								{
									sw.WriteLine(classStart);
									header = false;
								}
								sw.WriteLine(line);
							}
							sw.WriteLine(classEnd);
						}
					}
					StringBuilder newArgs = new StringBuilder();
					newArgs.Append("\"" + newFile + "\" ");
					for (int i=1; i <args.Length; i++)
						newArgs.Append(args[i] + "\" ");
	
					RunScript(newArgs.ToString());
				}
				finally
				{
					if (File.Exists(newFile))
						try { File.Delete(newFile); }catch{}
				}
			}
		}
	}
    static string ResolveFile (string file)
    {
        if (File.Exists(file))
            return Path.GetFullPath(file);
        if (File.Exists(file+".cs"))
            return Path.GetFullPath(file+".cs");
        else
            throw new Exception("Cannot find file " + file);
    }
    static void RunScript(string scriptFileCmd)
    {
        Process myProcess = new Process();
        myProcess.StartInfo.FileName = "cscscript.exe";
        myProcess.StartInfo.Arguments = "/nl " + scriptFileCmd;
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.RedirectStandardOutput = true;
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.Start();

        string line = null;
        while (null != (line = myProcess.StandardOutput.ReadLine()))
        {
            Console.WriteLine(line);
        }
        myProcess.WaitForExit();
    }
}