using System;
using System.IO;
using System.Text.RegularExpressions;

namespace RobvanderWoude
{
	class CanonModel
	{
		static int Main( string[] args )
		{
			if ( args.Length != 1 )
			{
				return WriteError( );
			}
			if ( args[0] == "/?" )
			{
				return WriteError( );
			}
			if ( args[0][0] == '/' )
			{
				return WriteError( "Invalid argument: \"" + args[0] + "\"" );
			}
			if ( !Directory.Exists( Path.GetDirectoryName( args[0] ) ) )
			{
				return WriteError( "Folder not found: \"" + Path.GetDirectoryName( args[0] ) + "\"" );
			}
			if ( !File.Exists( args[0] ) )
			{
				return WriteError( "File not found: \"" + args[0] + "\"" );
			}
			try
			{
				StreamReader file = new StreamReader( args[0] );
				char[] buffer = new char[1024];
				int result = file.Read( buffer, 0, 1023 );
				file.Close( );
				string model = new string( buffer );
				Regex regexp = new Regex( "Canon (PowerShot D[1-9]\\d*|EOS [1-9]\\d{0,3}D)" );
				Match match1 = regexp.Match( model );
				if ( match1.Success )
				{
					Console.WriteLine( match1 );
					regexp = new Regex( "\\d+" );
					Match match2 = regexp.Match( match1.Value );
					return Convert.ToInt32( match2.Value );
				}
				Console.Error.WriteLine( "Photo probably not made with a Canon EOS or PowerShot camera" );
				return WriteError( );
			}
			catch ( Exception e )
			{
				return WriteError( e.Message );
			}
		}

		#region Error handling

		public static int WriteError( string errorMessage = "" )
		{
			/*
			CanonModel,  Version 1.00
			Return the Canon camera model for the specified image file

			Usage:  FOR /F "tokens=*" %%A IN ('CANONMODEL  imagefile') DO SET camera=%%A
			
			   or:  CANONMODEL  imagefile
			        SET camera_number=%ErrorLevel%

			Notes:  This version only detects PowerShot D* and EOS *D models.
			        Works for unmodified Canon RAW or JPG images.
			        Camera model is displayed on screen (e.g. "Canon EOS 50D") and returned
			        as "errorlevel" (e.g. 50).
			        An errorlevel 0 implies the image was not found or was not made with a
			        Canon EOS *D or Canon PowerShot D* camera.
			        The author is in no way associated with Canon Inc., besides being the
			        owner of several Canon cameras.

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

			Console.ResetColor( );
			if ( string.IsNullOrEmpty( errorMessage ) == false )
			{
				Console.Error.WriteLine( );
				Console.ForegroundColor = ConsoleColor.Red;
				Console.Error.Write( "ERROR:  " );
				Console.ForegroundColor = ConsoleColor.White;
				Console.Error.WriteLine( errorMessage );
				Console.ResetColor( );
			}
			Console.Error.WriteLine( );
			Console.Error.WriteLine( "CanonModel,  Version 1.00" );
			Console.Error.WriteLine( "Return the Canon camera model for the specified image file" );
			Console.Error.WriteLine( );
			Console.Error.Write( "Usage:  FOR /F \"tokens=*\" %%A IN ('" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "CANONMODEL  imagefile" );
			Console.ResetColor( );
			Console.Error.WriteLine( "') DO SET camera=%%A" );
			Console.Error.WriteLine( );
			Console.Error.Write( "   or:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "CANONMODEL  imagefile" );
			Console.ResetColor( );
			Console.Error.WriteLine( "        SET camera_number=%ErrorLevel%" );
			Console.Error.WriteLine( );
			Console.Error.WriteLine( "Notes:  This version only detects PowerShot D* and EOS *D models." );
			Console.Error.WriteLine( "        Works for unmodified Canon RAW or JPG images." );
			Console.Error.Write( "        Camera model is displayed on screen (e.g. \"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "Canon EOS 50D" );
			Console.ResetColor( );
			Console.Error.WriteLine( "\") and returned" );
			Console.Error.Write( "        as \"errorlevel\" (e.g. " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "50" );
			Console.ResetColor( );
			Console.Error.WriteLine( ")." );
			Console.Error.Write( "        An errorlevel " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "0" );
			Console.ResetColor( );
			Console.Error.WriteLine( " implies the image was not found or was not made with a" );
			Console.Error.WriteLine( "        Canon EOS *D or Canon PowerShot D* camera." );
			Console.Error.WriteLine( "        The author is in no way associated with Canon Inc., besides being the" );
			Console.Error.WriteLine( "        owner of several Canon cameras." );
			Console.Error.WriteLine( );
			Console.Error.WriteLine( "Written by Rob van der Woude" );
			Console.Error.WriteLine( "http://www.robvanderwoude.com" );
			return 0;
		}

		#endregion Error handling

	}
}