using System;
using System.IO;
using System.Linq;

namespace project1
{
    class Program
    {
        static void Main(string[] args)
        {


            if (args.Length != 0)
            {
                Console.WriteLine("argument is not null");
                int argvalue;

                if (int.TryParse(args[0], out argvalue))
                {
                    // argument is an integer
                    int keepFiles = Int32.Parse(args[0]);
                    Console.WriteLine("arg is an int: " + keepFiles);

                    // get current directory
                    string curPath = Directory.GetCurrentDirectory();
                    // Console.Write("Current Path: " + curPath + "\n");

                    // save array of all folders in current directory
                    string[] folderArray = System.IO.Directory.GetDirectories(curPath, "*", System.IO.SearchOption.AllDirectories);

                    //loop over each folder
                    foreach (var curfolder in folderArray)
                    {

                        // get files array from current folder
                        DirectoryInfo di = new DirectoryInfo(curfolder);
                        FileSystemInfo[] files = di.GetFileSystemInfos("*.rpp-bak");
                        var orderedFiles = files.OrderByDescending(f => f.LastWriteTime);

                        // loop over ordered files in current folder
                        int count = 1;
                        foreach (var curfile in orderedFiles)
                        {
                            DateTime lastModified = System.IO.File.GetLastWriteTime(curfile.ToString());

                            if (count > keepFiles)
                            {
                                string FileToDelete = System.IO.Path.Combine(curfolder.ToString(), curfile.ToString());

                                // delete files above keepFiles count
                                Console.WriteLine(curfolder.ToString());
                                System.IO.File.Delete(FileToDelete);
                                Console.WriteLine("Deleted: " + FileToDelete);
                                Console.WriteLine("    " + lastModified.ToString());
                            }
                            else
                            {
                                // do nothing to files
                                Console.WriteLine("Not Deleted: " + curfile.ToString());
                                Console.WriteLine("    " + lastModified.ToString());
                            }

                            count++;
                        }
                    }

                }
                else
                {
                    // argument is not an integer
                    string argument = args[0];
                    Console.WriteLine("argument is NOT an int: " + argument);
                    Console.WriteLine("Delete_Rpp_Bak.exe is a utility that deletes \n older backup files and keeps x number of files.");
                    Console.WriteLine("");
                    Console.WriteLine("Usage: 'Delete_Rpp_Bak x' where x is the \n number of most recent *.rpp-bak files to keep");
                    Console.WriteLine("Must include only 1 integer argument for number \n of *.rpp-bak files to keep in each directory.");
                    Console.WriteLine("");
                    Console.WriteLine("Run 'Delete_Rpp_Bak.exe' in the directory above \n the directories you wish to clean");
                }

            }
            else
            {
                Console.WriteLine("argument is null");
                Console.WriteLine("Delete_Rpp_Bak.exe is a utility that deletes \n older backup files and keeps x number of files.");
                Console.WriteLine("");
                Console.WriteLine("Usage: 'Delete_Rpp_Bak x' where x is the \n number of most recent *.rpp-bak files to keep");
                Console.WriteLine("Must include only 1 integer argument for number \n of *.rpp-bak files to keep in each directory.");
                Console.WriteLine("");
                Console.WriteLine("Run 'Delete_Rpp_Bak.exe' in the directory above \n the directories you wish to clean");
            }



        }
    }
}