using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.IO;

namespace VersionWriter
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length == 0 || args.Length > 2)
            {
                Console.WriteLine("USAGE: VersionWriter.exe assemblypath [ouptutfile]");
                return;
            }
            // args[0] = path to assembly
            // args[1] = output file

            string asm_path = "";
            string out_file = "";
            if (args.Length == 1)
            {
                asm_path = args[0];
                out_file = string.Format("{0}-Version.txt", asm_path);
            }
            else
            {
                asm_path = args[0];
                out_file = args[1];
            }

            Console.WriteLine("Input: {0}", asm_path);
            Console.WriteLine("Output: {0}", out_file);

            Assembly asm = Assembly.LoadFile(asm_path);

            string version = asm.GetName().Version.ToString();

            Console.WriteLine("Writing version: {0} to {1}", version, out_file);
            using(FileStream fs  = new FileStream(out_file, FileMode.Create, FileAccess.Write, FileShare.Read))
            {
                StreamWriter sw = new StreamWriter(fs);
                sw.AutoFlush = true;
                sw.Write(version);
                sw.Close();
            }
            Console.WriteLine("Wrote version: {0} to {1}", version, out_file);
        }
    }
}