using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using Shell32;

// Add a reference to "Microsoft Shell Controls and Automation" from the COM tab of the References dialog

namespace RobvanderWoude
{
	internal class GetDimensions
	{
		static readonly string progver = "1.00";


		[STAThread]
		static int Main( string[] args )
		{
			bool returnheight = false;
			int imgwidth = 0;
			int imgheight = 0;
			string dimensions = string.Empty;


			#region Parse Command Line

			foreach ( string arg in args )
			{
				if ( arg == "/?" )
				{
					return ShowHelp( );
				}
			}

			if ( args.Length == 0 )
			{
				return ShowHelp( );
			}

			if ( args.Length > 2 )
			{
				return ShowHelp( "Too many command line arguments" );
			}

			if ( !File.Exists( args[0] ) )
			{
				return ShowHelp( "File not found: \"{0}\"", args[0] );
			}

			string parentfolder = Directory.GetParent( args[0] ).FullName;
			string imagename = Path.GetFileName( args[0] );

			if ( args.Length > 1 )
			{
				if ( args[1].ToUpper( ) == "/H" )
				{
					returnheight = true;
				}
				else
				{
					return ShowHelp( "Invalid command line argument \"{0}\"", args[1].Trim( "\" ".ToCharArray( ) ) );
				}
			}

			#endregion Parse Command Line


			#region Get Image Dimensions

			List<string> headers = new List<string>( );
			Shell shell = new Shell( );
			Folder folder = shell.NameSpace( parentfolder );
			FolderItem image = folder.ParseName( imagename );
			for ( int i = 0; i < short.MaxValue; i++ )
			{
				string header = folder.GetDetailsOf( null, i );
				if ( string.IsNullOrEmpty( header ) )
				{
					break;
				}
				headers.Add( header );
			}

			for ( int i = 0; i < headers.Count; i++ )
			{
				if ( headers[i] == "Dimensions" )
				{
					dimensions = folder.GetDetailsOf( image, i );
				}
			}
			if ( string.IsNullOrWhiteSpace( dimensions ) )
			{
				return ShowHelp( "Unable to determine the file's dimensions" );
			}
			string pattern = "(\\d+)\\s*x\\s*(\\d+)";
			Regex regex = new Regex( pattern );
			if ( !regex.IsMatch( dimensions ) )
			{
				return ShowHelp( "Unable to determine the file's dimensions" );
			}
			imgwidth = int.Parse( regex.Matches( dimensions )[0].Groups[1].Value );
			imgheight = int.Parse( regex.Matches( dimensions )[0].Groups[2].Value );

			#endregion Get Image Dimensions


			Console.WriteLine( dimensions );

			if ( returnheight )
			{
				return imgheight;
			}
			else
			{
				return imgwidth;
			}
		}


		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

			/*
			GetDimensions.exe,  Version 1.00
			Get the dimensions of an image file

			Usage:    GetDimensions.exe  imagefile  [ /H ]

			Where:    imagefile     is the image file whose dimensions we want to know
					  /H            return code equals image Height
			                        (default: return code equals image width)

			Notes:    This program can get the dimensions for any image type that is
			          recognized in Windows Explorer.
			          Return code equals the image width, or with /H switch the image
			          height, or -1 in case of errors.

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

			#endregion Help Text


			#region Display Help Text

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Get the dimensions of an image file" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "GetDimensions.exe  imagefile  [ /H ]" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "imagefile" );
			Console.ResetColor( );
			Console.Error.WriteLine( "     is the image file whose dimensions we want to know" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "          /H" );
			Console.ResetColor( );
			Console.Error.Write( "            return code equals image " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "H" );
			Console.ResetColor( );
			Console.Error.WriteLine( "eight" );

			Console.Error.WriteLine( "                        (default: return code equals image width)" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:    This program can get the dimensions for any image type that is" );

			Console.Error.WriteLine( "          recognized in Windows Explorer." );

			Console.Error.Write( "          Return code equals the image width, or with " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "/H" );
			Console.ResetColor( );
			Console.Error.WriteLine( " switch the image" );

			Console.Error.WriteLine( "          height, or -1 in case of errors." );

			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;
		}
	}
}