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

namespace UpdateConfigDamlDate
{
    class Program
    {
        static void Main(string[] args)
        {
        try
          {
            string damlPath = "";
            if (args.Count() > 0)
            {
                damlPath = args[0].ToString();
            }
            if (damlPath.Length == 0)
            {
                damlPath = Properties.Settings.Default.damlDefaultPath.ToString();
            }

            if (File.Exists(damlPath) == true)
            {
                if (File.Exists(damlPath + ".bak") == true) 
                { 
                    File.Delete(damlPath + ".bak"); 
                }
                File.Copy(damlPath,damlPath + ".bak");
                string[] theRows = File.ReadAllLines(damlPath);
                //search for the <date> row
                int dataRow = 0;
                for (int i = 0; i < theRows.Count(); i++)
                {
                    if (theRows[i].Contains("<Date>") == true)
                    {
                        dataRow = i;
                        break;
                    }
                }
                if(dataRow!=0)
                {
                    //determine spaces in front of <Data>
                    int spaces = theRows[dataRow].IndexOf('<');
                    if (spaces == -1) { spaces = 0; }
                    //update the date to NOW
                    DateTime now = DateTime.Now;
                    DateTime adjustedTime = now - TimeSpan.FromSeconds(now.Second);
                    String newLine = "<Date>" + adjustedTime.ToString("MM/dd/yyyy hh:mm:ss tt") + "</Date>";
                    //add needed spaces to the result
                    theRows[dataRow] = newLine.PadLeft(newLine.Length+spaces,' ');
                    //write the file
                    File.WriteAllLines(damlPath, theRows);
                }
                else
                {
                    Console.WriteLine("File and path provided exists but <Data> tag not found.");
                    throw new Exception("File and path provided exists but <Data> tag not found.");
                    }
            }
            else
            {
                Console.WriteLine("File or path provided, " + damlPath + ", does not exist.");
                throw new Exception("File or path provided, " + damlPath + ", does not exist.");
            }
            Environment.Exit(0);
          }
        catch (Exception eX)
           {
              //critical error, most likely permissions
              Console.WriteLine("Error: " + eX.Message.ToString());
              Environment.Exit(-1);
           }
        }
    }
}