/*
   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 << AppPath_get() << "global.xlink";
    process_xlink(filename.c_str(), "General", AppPath_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
}