/*
   Copyright (C) 1999-2006 Id Software, Inc. and contributors.
   For a list of contributors, see the accompanying CONTRIBUTORS file.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "help.h"

#include "debugging/debugging.h"

#include <vector>
#include <list>

#include "libxml/parser.h"
#include "generic/callback.h"
#include "gtkutil/menu.h"
#include "stream/stringstream.h"
#include "os/file.h"

#include "url.h"
#include "preferences.h"
#include "mainframe.h"

/*!
   the urls to fire up in the game packs help menus
 */
namespace
{
std::list<CopiedString> mHelpURLs;
}

/*!
   needed for hooking in Gtk+
 */
void HandleHelpCommand( CopiedString& str ){
	OpenURL( str.c_str() );
}

void process_xlink( const char* filename, const char *menu_name, const char *base_url, ui::Menu menu ){
	if ( file_exists( filename ) ) {
		xmlDocPtr pDoc = xmlParseFile( filename );
		if ( pDoc ) {
			globalOutputStream() << "Processing .xlink file '" << filename << "'\n";
			// create sub menu
			auto menu_in_menu = create_sub_menu_with_mnemonic( menu, menu_name );
			if ( g_Layout_enableDetachableMenus.m_value ) {
				menu_tearoff( menu_in_menu );
			}
			// start walking the nodes, find the 'links' one
			xmlNodePtr pNode = pDoc->children;
			while ( pNode && strcmp( (const char*)pNode->name, "links" ) )
				pNode = pNode->next;
			if ( pNode ) {
				pNode = pNode->children;
				while ( pNode )
				{
					if ( !strcmp( (const char*)pNode->name, "item" ) ) {
						// process the URL
						CopiedString url;

						xmlChar* prop = xmlGetProp( pNode, reinterpret_cast<const xmlChar*>( "url" ) );
						ASSERT_NOTNULL( prop );
						if ( strstr( reinterpret_cast<const char*>( prop ), "http://" ) ||
							strstr( reinterpret_cast<const char*>( prop ), "https://" ) ) {
							// complete URL
							url = reinterpret_cast<const char*>( prop );
						}
						else
						{
							// relative URL
							StringOutputStream full( 256 );
							full << base_url << reinterpret_cast<const char*>( prop );
							url = full.c_str();
						}

						mHelpURLs.push_back( url );

						xmlFree( prop );

						prop = xmlGetProp( pNode, reinterpret_cast<const xmlChar*>( "name" ) );
						ASSERT_NOTNULL( prop );
						create_menu_item_with_mnemonic( menu_in_menu, reinterpret_cast<const char*>( prop ), ReferenceCaller<CopiedString, void(), HandleHelpCommand>( mHelpURLs.back() ) );
						xmlFree( prop );
					}
					pNode = pNode->next;
				}
			}
			xmlFreeDoc( pDoc );
		}
		else
		{
			globalOutputStream() << "'" << filename << "' parse failed\n";
		}
	}
	else
	{
		globalOutputStream() << "'" << filename << "' not found\n";
	}
}

void create_game_help_menu( ui::Menu menu ){
	StringOutputStream filename( 256 );
	filename << DataPath_get() << "global.xlink";
	process_xlink(filename.c_str(), "General", DataPath_get(), menu);

#if 1
	filename.clear();
	filename << g_pGameDescription->mGameToolsPath.c_str() << "game.xlink";
	process_xlink( filename.c_str(), g_pGameDescription->getRequiredKeyValue( "name" ), g_pGameDescription->mGameToolsPath.c_str(), menu );
#else
	for ( std::list<CGameDescription *>::iterator iGame = g_GamesDialog.mGames.begin(); iGame != g_GamesDialog.mGames.end(); ++iGame )
	{
		filename.clear();
		filename << ( *iGame )->mGameToolsPath.c_str() << "game.xlink";
		process_xlink( filename.c_str(), ( *iGame )->getRequiredKeyValue( "name" ), ( *iGame )->mGameToolsPath.c_str(), menu );
	}
#endif
}
