using System;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.InteropServices;


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

		static string template;
		static string decimalseparator = NumberFormatInfo.CurrentInfo.NumberDecimalSeparator;


		static int Main( string[] args )
		{
			if ( args.Length == 0 )
			{
				return ShowHelp( );
			}
			foreach ( string arg in args )
			{
				if ( arg == "/?" )
				{
					return ShowHelp( );
				}
			}

			List<string> arguments = new List<string>( args );
			template = arguments[0].Replace( "\\n", "\n" ).Replace( "\\r", "\r" ).Replace( "\\t", "\t" );
			arguments.RemoveAt( 0 );

			if ( Console.IsInputRedirected )
			{
				if ( args.Length == 1 )
				{
					int rc = 0;
					string[] lines = Console.In.ReadToEnd( ).Split( '\n' );
					for ( int i = 0; i < lines.Length; i++ )
					{
						if ( !string.IsNullOrWhiteSpace( lines[i] ) )
						{
							rc += ParseLine( CommandLineToArgs( lines[i] ) );
						}
					}
					if ( rc == 0 )
					{
						return 0;
					}
					return -1;
				}
				else
				{
					return ShowHelp( "Specify only template on command line when using redirected arguments" );
				}
			}
			else if ( args.Length > 1 )
			{
				return ParseLine( arguments.ToArray( ) );
			}
			else
			{
				return ShowHelp( );
			}
		}


		static int ParseLine( string[] arguments )
		{
			object[] values = new object[arguments.Length]; // copy of arguments[] but with different types
			for ( int i = 0; i < arguments.Length; i++ )
			{
				if ( float.TryParse( arguments[i], out float floatvalue ) )
				{
					if ( int.TryParse( arguments[i], out int intvalue ) )
					{
						if ( floatvalue == intvalue )
						{
							values[i] = intvalue;
						}
						else
						{
							values[i] = floatvalue;
						}
					}
					else
					{
						values[i] = floatvalue;
					}
				}
				else if ( DateTime.TryParse( arguments[i], out DateTime datetimevalue ) )
				{
					values[i] = datetimevalue;
				}
				else if ( DateTime.TryParse( arguments[i].Replace( decimalseparator, "." ), out datetimevalue ) )
				{
					// Work-around for issue with decimal separator in time strings (on Dutch systems)
					values[i] = datetimevalue;
				}
				else
				{
					values[i] = arguments[i];
				}
			}
			try
			{
				Console.WriteLine( template, values );
				return 0;
			}
			catch ( Exception e )
			{
				return ShowHelp( e.Message );
			}
		}


		#region Convert redirected input to command line args

		// Code by Atif Aziz on StackOverflow.com:
		// https://stackoverflow.com/a/749653
		[DllImport( "shell32.dll", SetLastError = true )]
		static extern IntPtr CommandLineToArgvW( [MarshalAs( UnmanagedType.LPWStr )] string lpCmdLine, out int pNumArgs );


		public static string[] CommandLineToArgs( string commandLine )
		{
			int argc;
			var argv = CommandLineToArgvW( commandLine, out argc );
			if ( argv == IntPtr.Zero )
				throw new System.ComponentModel.Win32Exception( );
			try
			{
				var args = new string[argc];
				for ( var i = 0; i < args.Length; i++ )
				{
					var p = Marshal.ReadIntPtr( argv, i * IntPtr.Size );
					args[i] = Marshal.PtrToStringUni( p );
				}

				return args;
			}
			finally
			{
				Marshal.FreeHGlobal( argv );
			}
		}

		#endregion Convert redirected input to command line args


		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

			/*
			ToString.exe,  Version 1.01
			Batch tool to format numbers and dates the .NET way
			
			Usage:   ToString.exe  template  arguments

			   or:   some_command  |  ToString.exe  template

			Where:   template      string specifying how the arguments will be formated
			         arguments     single or multiple numbers or dates to be formated
			         some_command  command supplying the argument(s) in its standard output
			                       (multiple lines of input will each be parsed separately)
			
			Example: ToString "{0,6:F2}\t0x{1:X8}\t{2:dd-MM-yyyy}" "0.125" 500 2022-02-24
			Returns:   0,13    0x000001F4      24-02-2022
			
			Example: ToString "{0:yyyyMMddTHHmmssfffzzz}" %Time%
			Returns: 20220225T121343800+01:00
			
			Example: TIME /T | ToString "{0:yyyyMMddTHHmmssfffzzz}"
			Returns: 20220225T121343800+01:00
			
			Example: ToString "{0}" %Time%
			Returns: 2022-02-25 15:34:18
			
			Example: ToString "{0}" %Date%
			Returns: 2022-02-25 00:00:00

			Example: DIR %UserProfile%\.. | FIND "<DIR>" | ToString "{0:D}, {1:T}\t{3}"
			Returns: Saturday, 1 January 2022, 09:44:00     .
			         Saturday, 1 January 2022, 09:44:00     ..
			         Wednesday, 16 February 2022, 17:22:00  Default
			         Wednesday, 3 February 2021, 16:46:00   Public
			         Saturday, 22 January 2022, 09:25:00    Rob
			
			Quirks:  Regardless of date and time separators specified in the template,
			         ToString may still use your culture's separators in its output.
			         On the other hand, it may have a problem with decimal separators
			         in a specified time string, even if it complies with your culture;
			         some code has been added to provide for this issue.
			
			Note:    Return code will be -1 if errors were encountered, otherwise 0.

			Credits: Merge redirected input with command line by Atif Aziz
			         https://stackoverflow.com/a/749653
			
			Written by Rob van der Woude
			https://www.robvanderwoude.com
			*/

			#endregion Help Text


			#region Display Help Text

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Batch tool to format numbers and dates the .NET way" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:   " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ToString.exe  template  arguments" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "   or:   " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "some_command  |  ToString.exe  template" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:   " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "template" );
			Console.ResetColor( );
			Console.Error.WriteLine( "      string specifying how the arguments will be formated" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "         arguments" );
			Console.ResetColor( );
			Console.Error.WriteLine( "     single or multiple numbers or dates to be formated" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "         some_command" );
			Console.ResetColor( );
			Console.Error.WriteLine( "  command supplying the argument(s) in its standard output" );

			Console.Error.WriteLine( "                       (multiple lines of input will each be parsed separately)" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ToString \"{0,6:F2}\\t0x{1:X8}\\t{2:dd-MM-yyyy}\" \"0.125\" 500 2022-02-24" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "  0,13\t0x000001F4\t24-02-2022" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ToString \"{0:yyyyMMddTHHmmssfffzzz}\" %Time%" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( DateTime.Now.ToString( "yyyyMMddTHHmmssfffzzz" ) );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "TIME /T | ToString \"{0:yyyyMMddTHHmmssfffzzz}\"" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( DateTime.Now.ToString( "yyyyMMddTHHmmssfffzzz" ) );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ToString \"{0}\" %Time%" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( DateTime.Now.ToString( ) );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ToString \"{0}\" %Date%" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( DateTime.Now.Date.ToString( ) );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Example: " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "DIR %UserProfile%\\.. | FIND \"<DIR>\" | ToString \"{0:D}, {1:T}\\t{3}\"" );
			Console.ResetColor( );

			Console.Error.Write( "Returns: " );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "Saturday, 1 January 2022, 09:44:00\t." );

			Console.Error.WriteLine( "         Saturday, 1 January 2022, 09:44:00\t.." );

			Console.Error.WriteLine( "         Wednesday, 16 February 2022, 17:22:00\tDefault" );

			Console.Error.WriteLine( "         Wednesday, 3 February 2021, 16:46:00\tPublic" );

			Console.Error.WriteLine( "         Saturday, 22 January 2022, 09:25:00\t{0}", Environment.GetEnvironmentVariable( "UserName" ) );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Quirks:  Regardless of date and time separators specified in the template," );

			Console.Error.WriteLine( "         ToString may still use your culture's separators in its output." );

			Console.Error.WriteLine( "         On the other hand, it may have a problem with decimal separators" );

			Console.Error.WriteLine( "         in a specified time string, even if it complies with your culture;" );

			Console.Error.WriteLine( "         some code has been added to provide for this issue." );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Note:    Return code will be -1 if errors were encountered, otherwise 0." );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Credits: Merge redirected input with command line by Atif Aziz" );

			Console.ForegroundColor = ConsoleColor.DarkGray;
			Console.Error.WriteLine( "         https://stackoverflow.com/a/749653" );
			Console.ResetColor( );

			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;
		}
	}
}