using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Windows.Forms;


namespace RobvanderWoude
{
	internal class GetSystemInformation
	{
		static string progver = "1.02";


		static int Main( string[] args )
		{
			int columnwidth = 0;
			SortedList<string, object> sysinfolist = new SortedList<string, object>( );

			Type sysinfotype = typeof( SystemInformation );
			PropertyInfo[] propertyinfo = sysinfotype.GetProperties( );

			for ( int i = 0; i < propertyinfo.Length; i++ )
			{
				string name = propertyinfo[i].Name;
				// populate list with property names and values
				sysinfolist[name] = propertyinfo[i].GetValue( sysinfotype, null );
				// calculate required column width
				columnwidth = Math.Max( columnwidth, name.Length );
			}

			switch ( args.Length )
			{
				case 0:
					// show entire list
					foreach ( string key in sysinfolist.Keys )
					{
						Console.WriteLine( "{0,-" + columnwidth + "}    {1}", key, sysinfolist[key] );
					}
					return 0;
				case 1:
					if ( args[0].Contains( "?" ) )
					{
						return ShowHelp( );
					}
					// test exact match, no wildcards
					foreach ( string key in sysinfolist.Keys )
					{
						if ( key.ToUpper( ) == args[0].ToUpper( ) ) // make the search case insensitive
						{
							// show matching property and its value
							Console.WriteLine( "{0}:    {1}", key, sysinfolist[key] );
							string testvalue = string.Format( "{0}", sysinfolist[key] );
							int rc;
							// return code equals numeric value, if possible
							if ( int.TryParse( testvalue, out rc ) )
							{
								return rc;
							}
							return 0;
						}
					}
					// test wildcard matches
					if ( args[0].Contains( "*" ) )
					{
						bool matchfound = false;
						// exclude partial matches
						string pattern = string.Format( "^{0}$", args[0] );
						// convert "DOS format" wildcards to regex format
						pattern = pattern.Replace( "*", ".*?" );
						Regex regex = new Regex( pattern, RegexOptions.IgnoreCase );
						// recalculate required column width
						columnwidth = 0;
						foreach ( string key in sysinfolist.Keys )
						{
							if ( regex.IsMatch( key ) )
							{
								matchfound = true;
								columnwidth = Math.Max( columnwidth, key.Length );
							}
						}
						if ( !matchfound )
						{
							return ShowHelp( "Invalid command line argument \"{0}\"", args[0] );
						}
						// show all matching properties and their values
						foreach ( string key in sysinfolist.Keys )
						{
							if ( regex.IsMatch( key ) )
							{
								matchfound = true;
								Console.WriteLine( "{0,-" + columnwidth + "}    {1}", key, sysinfolist[key] );
							}
						}
						return 0;
					}
					else
					{
						return ShowHelp( "Invalid command line argument \"{0}\"", args[0] );
					}
				default:
					return ShowHelp( "Too many command line arguments" );
			}
		}


		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

			/*
			GetSystemInformation.exe,  Version 1.02
			Get properties and values of .NET's System.Windows.Forms.SystemInformation class
 
			Usage:    GetSystemInformation.exe  [ property ]
 
			Where:    property     is the name of the property (or properties) to be queried
			                       (wildcard * allowed, e.g. mouse* or *window*)

			Notes:    Without a command line argument, the program will list all properties
			          and values of .NET's System.Windows.Forms.SystemInformation class.
			          If a single property name (no wildcards) is specified on the command
			          line, and its value is numeric, the return code will equal (the
			          integer of) that value, or 0 if the value isn't numeric, or -1 in
			          case of (command line) errors.
 
			Written by Rob van der Woude
			https://www.robvanderwoude.com
			*/

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Get properties and values of .NET's System.Windows.Forms.SystemInformation class" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "GetSystemInformation.exe  [ property ]" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "property" );
			Console.ResetColor( );
			Console.Error.WriteLine( "     is the name of the property (or properties) to be queried" );

			Console.Error.WriteLine( "                       (wildcard * allowed, e.g. mouse* or *window*)" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:    Without a command line argument, the program will list all properties" );

			Console.Error.WriteLine( "          and values of .NET's System.Windows.Forms.SystemInformation class." );

			Console.Error.WriteLine( "          If a single property name (no wildcards) is specified on the command" );

			Console.Error.WriteLine( "          line, and its value is numeric, the return code will equal (the" );

			Console.Error.WriteLine( "          integer of) that value, or 0 if the value isn't numeric, or -1 in" );

			Console.Error.WriteLine( "          case of (command line) errors." );

			Console.Error.WriteLine( );

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

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

			#endregion Help Text

			return -1;
		}
	}
}