using System;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;

namespace Orthogonal.Samples
{
	/// <summary>
	/// A simple console command to drive and test the Win32FileFinder class.
	/// Command syntax is:
	/// <code>finder [ filemask ] [ maxfiles ]</code>
	/// </summary>
	public sealed class FinderCommand
	{
		private Win32FileFinder finder;
		private int findCount;
		private string filemask;
		private int maxfiles;
		private StringBuilder sb;

		static void Main(string[] args)
		{
			new FinderCommand().Run(args);
		}

		public void Run(string[] args)
		{
			if (args.Length == 0)
			{
				Console.WriteLine("SYNTAX:  finder [ filemask ] [ maxfiles ]");
				return;
			}
			sb = new StringBuilder(64);
			finder = new Win32FileFinder();
			finder.FileFound += new FileFoundEventHandler(finder_FileFound);
			if (args.Length >= 1)
				filemask = args[0];
			if (args.Length >= 2)
				int.TryParse(args[1], out maxfiles);
			try
			{
				finder.Find(filemask);
			}
			catch (ArgumentException argex)
			{
				Console.WriteLine("{0} -> '{1}'", argex.Message, filemask);
			}
			catch (FileFinderException ex)
			{
				Win32Exception ex32 = (Win32Exception)ex.InnerException;
				Console.WriteLine("error: {0}\nMessage: {1}\nError Code: 0x{2,8:x8}\nNative Code: 0x{3,8:x8}",
					ex.Message,
					ex32.Message,
					ex32.ErrorCode,
					ex32.NativeErrorCode);
			}
		}

		private void finder_FileFound(object sender, FileFoundEventArgs e)
		{
			++findCount;
			if ((maxfiles > 0) && (findCount > maxfiles))
			{
				e.Cancel = true;
				return;
			}
			if (e.File != null)
			{
				sb.Length = 64;
				StrFormatByteSize(e.File.Length, sb, sb.Length);
				Console.WriteLine("{0:yyMMddHHmmss} {1:yyMMddHHmmss} {2,10} {3}",
					e.File.CreationTime,
					e.File.LastWriteTime,
					sb.ToString().Trim(),
					e.File.FullName);
			}
			else
			{
				Console.WriteLine("<DIR> {0}", e.Folder.FullName);
			}
		}

		[DllImport("Shlwapi.dll", CharSet = CharSet.Auto)]
		public static extern long StrFormatByteSize(long fileSize, [MarshalAs(UnmanagedType.LPTStr)] StringBuilder buffer, int bufferSize);

	}
}