using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.VisualBasic.FileIO;


namespace RobvanderWoude
{
	internal class Trash
	{
		static readonly string progver = "1.01";


		static int Main( string[] args )
		{
			bool continueonerrors = false;
			bool debugmode = false;
			bool verbose = false;
			UIOption dialogs = UIOption.OnlyErrorDialogs;
			int rc = 0;
			int deleted = 0;
			int failed = 0;

			if ( args.Length == 0 || args.Contains( "/?" ) )
			{
				return ShowHelp( );
			}

			foreach ( string arg in args )
			{
				if ( arg.ToUpper( ) == "/C" )
				{
					if ( continueonerrors )
					{
						return ShowHelp( "Duplicate command line switch /C" );
					}
					continueonerrors = true;
				}
				else if ( arg.ToUpper( ) == "/D" )
				{
					if ( debugmode )
					{
						return ShowHelp( "Duplicate command line switch /D" );
					}
					debugmode = true;
				}
				else if ( arg.ToUpper( ) == "/V" )
				{
					if ( verbose )
					{
						return ShowHelp( "Duplicate command line switch /V" );
					}
					verbose = true;
					dialogs = UIOption.AllDialogs;
				}
				else if ( arg[0] == '/' )
				{
					return ShowHelp( "Invalid command line switch {0}", arg );
				}
				else if ( !Directory.Exists( Directory.GetParent( arg ).FullName ) )
				{
					if ( continueonerrors )
					{
						rc = 1;
					}
					else
					{
						return ShowHelp( "File \"{0}\" not found", arg );
					}
				}
			}

			verbose = verbose || debugmode;
			List<string> filestodelete = new List<string>( );

			foreach ( string arg in args )
			{
				if ( arg[0] != '/' )
				{
					DirectoryInfo directory = Directory.GetParent( arg );
					FileInfo[] files = directory.GetFiles( Path.GetFileName( arg ) );
					foreach ( FileInfo file in files )
					{
						filestodelete.Add( file.FullName );
					}
				}
			}

			if ( filestodelete.Count == 0 )
			{
				if ( continueonerrors )
				{
					rc = 1;
					Console.WriteLine( "No files to delete" );
				}
				else
				{
					return ShowHelp( "No files to delete" );
				}
			}

			foreach ( string file in filestodelete )
			{
				try
				{
					if ( verbose )
					{
						Console.Write( "Deleting \"{0}\" . . . ", file );
					}
					if ( !debugmode )
					{
						FileSystem.DeleteFile( file, dialogs, RecycleOption.SendToRecycleBin );
					}
					if ( verbose )
					{
						Console.ForegroundColor = ConsoleColor.Green;
						Console.WriteLine( "success" );
						Console.ResetColor( );
					}
					deleted++;
				}
				catch ( Exception e )
				{
					if ( continueonerrors )
					{
						rc = 1;
						if ( verbose )
						{
							Console.ForegroundColor = ConsoleColor.Red;
							Console.WriteLine( "failed" );
							Console.ResetColor( );
						}
						failed++;
					}
					else
					{
						return ShowHelp( e.Message );
					}
				}
			}

			if ( verbose )
			{
				if ( deleted == 1 )
				{
					Console.Write( "\nSuccessfully deleted 1 file, " );
				}
				else
				{
					Console.Write( "\nSuccessfully deleted {0} files, ", deleted );
				}
				if ( failed == 1 )
				{
					Console.WriteLine( "1 file failed" );
				}
				else
				{
					Console.WriteLine( "{0} files failed", failed );
				}
			}

			return rc;
		}


		public static int ShowHelp( params string[] errmsg )
		{
			#region Error Message

			if ( errmsg.Length > 0 )
			{
				List<string> errargs = new List<string>( errmsg );
				errargs.RemoveAt( 0 );
				Console.Error.WriteLine( );
				Console.ForegroundColor = ConsoleColor.Red;
				Console.Error.Write( "ERROR:\t" );
				Console.ForegroundColor = ConsoleColor.White;
				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );
				Console.ResetColor( );
			}

			#endregion Error Message


			#region Help Text

			/*
			Trash.exe,  Version 1.01
			Send specified file(s) to the recycle bin

			Usage:    TRASH.EXE  filespec  [ filespec  [ ... ] ] ]  [ options ]

			Where:    filespec   file(s) to be sent to the recycle bin (wildcards allowed)

			Options:  /C         Continue on errors (default: abort on first error)
			          /D         Debug mode: files are listed only, not deleted
			          /V         Verbose output: show file name(s), progress and error
			                     dialogs, and summary (default: error dialogs only)
			
			Note:     Return code ("ErrorLevel"):
			          * successful deletion of all files specified:                             0
			          * invalid directory, failure to delete or no matching file (with    /C):  1
			          * invalid directory, failure to delete or no matching file (without /C): -1
			          * invalid command line argument:                                         -1

			Written by Rob van der Woude
			https://www.robvanderwoude.com
			*/

			#endregion Help Text


			#region Display Help Text

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Trash.exe,  Version {0}", progver );

			Console.Error.WriteLine( "Send specified file(s) to the recycle bin" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "TRASH.EXE  filespec  [ filespec  [ ... ] ] ]  [ /V ]" );
			Console.ResetColor( );

			Console.Error.WriteLine( );
						
			Console.Error.Write( "Where:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "filespec" );
			Console.ResetColor( );
			Console.Error.WriteLine( "   file(s) to be sent to the recycle bin (wildcards allowed)" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Options:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "/C         C" );
			Console.ResetColor( );
			Console.Error.WriteLine( "ontinue on errors (default: abort on first error)" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "          /D         D" );
			Console.ResetColor( );
			Console.Error.WriteLine( "ebug mode: files are listed only, not deleted" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "          /V         V" );
			Console.ResetColor( );
			Console.Error.WriteLine( "erbose output: show file name(s), progress and error" );

			Console.Error.WriteLine( "                     dialogs, and summary (default: error dialogs only)" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Note:     Return code (\"ErrorLevel\"):" );

			Console.Error.WriteLine( "          * successful deletion of all files specified:                             0" );

			Console.Error.Write( "          * invalid directory, failure to delete or no matching file (with    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "/C" );
			Console.ResetColor( );
			Console.Error.WriteLine( "):  1" );

			Console.Error.Write( "          * invalid directory, failure to delete or no matching file (without " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "/C" );
			Console.ResetColor( );
			Console.Error.WriteLine( "): -1" );

			Console.Error.WriteLine( "          * invalid command line argument:                                         -1" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Written by Rob van der Woude" );

			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

			#endregion Display Help Text


			return -1;
		}
	}
}