using System;
using System.Collections.Generic;
using System.IO;
using unoidl.com.sun.star.beans;
using unoidl.com.sun.star.frame;
using unoidl.com.sun.star.lang;
using unoidl.com.sun.star.uno;


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


		static int Main( string[] args )
		{
			string fileIn, fileOut;


			#region Command Line Arguments

			if ( args.Length != 1 || args[0] == "/?" )
			{
				return ShowHelp( );
			}

			fileIn = Path.GetFullPath( args[0] );
			/*
			if ( !Path.GetExtension( fileIn ).Equals( ".odt", StringComparison.OrdinalIgnoreCase ) )
			{
				return ShowHelp( "Invalid input file type/extension" );
			}
			*/
			if ( !File.Exists( fileIn ) )
			{
				return ShowHelp( "Input file does not exist" );
			}
			if ( !Directory.GetParent( fileIn ).Exists )
			{
				return ShowHelp( "Parent folder of input file does not exist" );
			}
			fileOut = Path.Combine( Path.GetDirectoryName( fileIn ), Path.GetFileNameWithoutExtension( fileIn ) + ".repaired.docx" );

			#endregion Command Line Arguments


			#region Requirements

			if ( typeof( XComponentContext ) == null )
			{
				return ShowHelp( "OpenOffice/LibreOffice SDK was not found." );
			}

			#endregion Requirements


			bool success = SaveRepairedDocx( fileIn, fileOut );
			if ( !success )
			{
				return ShowHelp( "Could not repair and save the file" );
			}

			return 0;
		}


		static bool SaveRepairedDocx( string fileIn, string fileOut )
		{
			try
			{
				// The main functionality uses OpenOffice's UNO components
				// http://en.wikipedia.org/wiki/Universal_Network_Objects
				string urlIn = "file:///" + Path.GetFullPath( fileIn ).Replace( "\\", "/" );
				string urlOut = "file:///" + Path.GetFullPath( fileOut ).Replace( "\\", "/" );
				XComponentContext unoBootstrap = uno.util.Bootstrap.bootstrap( );
				XMultiServiceFactory unoServiceMan = (XMultiServiceFactory)unoBootstrap.getServiceManager( );
				XComponentLoader unoDesk = (XComponentLoader)unoServiceMan.createInstance( "com.sun.star.frame.Desktop" );
				PropertyValue[] inputProperties = new PropertyValue[1];
				inputProperties[0] = new PropertyValue( );
				inputProperties[0].Name = "Hidden";
				inputProperties[0].Value = new uno.Any( true );
				XComponent unoDoc = unoDesk.loadComponentFromURL( urlIn, "_blank", 0, inputProperties );
				PropertyValue[] outputProperties = new PropertyValue[1];
				outputProperties[0] = new PropertyValue( );
				outputProperties[0].Name = "FilterName";
				outputProperties[0].Value = new uno.Any( "MS Word 2007 XML" );
				( (XStorable)unoDoc ).storeToURL( urlOut, outputProperties );
				( (XComponent)unoDoc ).dispose( );
				unoDoc = null;
				return true;
			}
			catch ( unoidl.com.sun.star.uno.Exception )
			{
				return false;
			}
		}


		#region Error Handling

		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

			/*
			FixWordUnreadableContent.exe,  Version 1.00
			Use LibreOffice/OpenOffice to fix Word documents with unreadable content

			Usage:    FixWordUnreadableContent.exe  inputfile

			Where:    inputfile        is the Word file to be repaired

			Notes:    If the program successfully repaired the Word document with
			          unreadable content, it saves it with the same name and location,
			          replacing the .docx extension by .repaired.docx
			          The repaired document will miss the corrupted parts, but will at
			          least be editable without "unreadable content" error message.
			          Requires LibreOffice or OpenOffice, its SDK and a Java runtime.
			          Tested with LibreOffice 24.8.0.3 and Java 22.0.1+8-16.
			          Return code ("Errorlevel") 1 in case of errors, otherwise 0.

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

			#endregion Help Text


			#region Display Help Text

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Use LibreOffice/OpenOffice to fix Word documents with unreadable content" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "FixWordUnreadableContent.exe  inputfile" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:    " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "inputfile" );
			Console.ResetColor( );
			Console.Error.WriteLine( "        is the Word file to be repaired" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:    If the program successfully repaired the Word document with" );

			Console.Error.WriteLine( "          unreadable content, it saves it with the same name and location," );

			Console.Error.WriteLine( "          replacing the .docx extension by .repaired.docx" );

			Console.Error.WriteLine( "          The repaired document will miss the corrupted parts, but will at" );

			Console.Error.WriteLine( "          least be editable without \"unreadable content\" error message." );

			Console.Error.WriteLine( "          Requires LibreOffice or OpenOffice, its SDK and a Java runtime." );

			Console.Error.WriteLine( "          Tested with LibreOffice 24.8.0.3 and Java 22.0.1+8-16." );

			Console.Error.WriteLine( "          Return code (\"Errorlevel\") 1 in case of errors, otherwise 0." );

			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;
		}

		#endregion Error Handling
	}
}