/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   This program 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.
 *
 *   This program 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 this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Reto Grieder
 *      Benjamin Knecht
 *   Co-authors:
 *      ...
 *
 */

/**
    @file
    @ingroup Graphics
*/

#ifndef _GUIManager_H__
#define _GUIManager_H__

#include "CorePrereqs.h"

#include <map>
#include <string>
#include <memory>

#if CEGUI_VERSION >= 0x000800
#   include <CEGUI/ForwardRefs.h>
#   include <CEGUI/Version.h>
#else
#   include <CEGUIForwardRefs.h>
#   include <CEGUIVersion.h>
#endif

#include "util/DestructionHelper.h"
#include "util/OgreForwardRefs.h"
#include "util/tribool.h"
#include "util/Singleton.h"
#include "input/InputHandler.h"
#include "WindowEventListener.h"

#if CEGUI_VERSION_MAJOR < 1 && CEGUI_VERSION_MINOR < 7
#  define ORXONOX_OLD_CEGUI
#endif

namespace orxonox // tolua_export
{ // tolua_export
    class PlayerInfo; // Forward declaration

    // Acquaint Tolua with tribool
    /* tolua_begin
    struct dontcare_keyword_t
    {
        dontcare_keyword_t();
    };
    class tribool
    {
        tribool(bool value);
        tribool(dontcare_keyword_t);
        bool operator==(tribool);
    };
    tolua_end */

    /**
    @class GUIManager
    @brief
        Provides a simple interface to CEGUI with tolua methods and console commands. It also acts as a key and mouse handler.

        The GUIManager is a singleton and can be called anywhere when access on the GUI is needed.

        Since the GUI needs user input, the GUIManager implements the functions needed to act as a key and/or mouse handler.
        Those input events are then injected into CEGUI in Lua.
    */
    class _CoreExport GUIManager // tolua_export
        : public Singleton<GUIManager>, public InputHandler, public WindowEventListener
    { // tolua_export
        friend class Singleton<GUIManager>;
    public:
        GUIManager(const std::pair<int, int>& mousePosition);

        //! Leave empty and use cleanup() instead
        ~GUIManager() = default;
        /// Destructor that also executes when object fails to construct
        void destroy();

        void setConfigValues(void);
        void changedGUIScheme(void);

        void preUpdate(const Clock& time);

        std::vector<std::string> getLoadedGUIs();

        void loadGUI(const std::string& name);
        static void showGUI(const std::string& name, bool bHidePrevious = false, bool bNoInput = false);
        void showGUIExtra(const std::string& name, const std::string& ptr, bool bHidePrevious = false, bool bNoInput = false);
        static void hideGUI(const std::string& name);
        static void toggleGUI(const std::string& name, bool bHidePrevious = false, bool bNoInput = false);
        void toggleGUIHelper(const std::string& name, bool bHidePrevious, bool bNoInput, bool show); // tolua_export
        void keyESC();
        void setBackgroundImage(const std::string& imageSet, const std::string imageName); // tolua_export
        void setBackgroundImage(const std::string& image);

        static bool preloadMenuSheets() { return GUIManager::getInstance().bPreloadMenuSheets_; } // tolua_export
        static bool inDevMode(void); // tolua_export

        //! Creates a new InputState to be used with a GUI Sheet
        const std::string& createInputState(const std::string& name, tribool showCursor = tribool(true), tribool useKeyboard = tribool(true), bool bBlockJoyStick = false); // tolua_export
        LuaState* getLuaState(void)
            { return this->luaState_; }

        //! Returns the root window for all menu sheets
        CEGUI::Window* getMenuRootWindow() { return this->menuRootWindow_; } // tolua_export
        //! Returns the root window for all HUD sheets
        CEGUI::Window* getHUDRootWindow() { return this->hudRootWindow_; } // tolua_export

        void setCamera(Ogre::Camera* camera);
        Ogre::Camera* getCamera() { return this->camera_; }

        inline void setPlayer(const std::string& guiname, PlayerInfo* player)
            { this->players_[guiname] = player; }
        inline orxonox::PlayerInfo* getPlayer(const std::string& guiname) const { std::map<std::string, PlayerInfo*>::const_iterator it = this->players_.find(guiname); return (it != this->players_.end()) ? it->second : nullptr; } // tolua_export

        // TODO: Temporary hack because the tolua exported CEGUI method does not seem to work
        static void subscribeEventHelper(CEGUI::Window* window, const std::string& event, const std::string& function); // tolua_export
        static void setTooltipTextHelper(CEGUI::ListboxItem* item, const std::string& toooltip); // tolua_export
        static void setItemTooltipsEnabledHelper(CEGUI::Listbox* listbox, bool enabled); // tolua_export
        static void addFontHelper(const std::string& name, int size, const std::string& fontName); // tolua_export
        static float getFontTextExtent(const CEGUI::Font* font, const std::string& text, float x_scale = 1.0f); // tolua_export

        static GUIManager& getInstance() { return Singleton<GUIManager>::getInstance(); } // tolua_export

        /**
        @brief Check whether CEGUI is version < 0.7.
        @return Returns true if the CEGUI version is < 0.7. False otherwise.
        */
        inline bool usingOldCEGUI(void) { return this->oldCEGUI_; } // tolua_export

    private:
        // non-copyable:
        GUIManager(const GUIManager&) = delete;
        GUIManager& operator=(const GUIManager&) = delete;

        void executeCode(const std::string& str);

        template <typename FunctionType, typename ObjectType>
        bool protectedCall(FunctionType function, ObjectType object);

        template <typename FunctionType>
        bool protectedCeguiSystemCall(FunctionType function);

#if CEGUI_VERSION >= 0x000800
        template <typename FunctionType>
        bool protectedCeguiContextCall(FunctionType function);
#endif

        void changedCeguiOutputLevel();

        // keyHandler functions
        virtual void buttonPressed (const KeyEvent& evt) override;
        virtual void buttonReleased(const KeyEvent& evt) override;

        // mouseHandler functions
        virtual void buttonPressed (MouseButtonCode::ByEnum id) override;
        virtual void buttonReleased(MouseButtonCode::ByEnum id) override;
        virtual void mouseMoved    (IntVector2 abs, IntVector2 rel, IntVector2 clippingSize) override;
        virtual void mouseScrolled (int abs, int rel) override;
        void mouseLeft     ();

        // window event handler
        virtual void windowResized(unsigned int newWidth, unsigned int newHeight) override;
        virtual void windowFocusChanged(bool bFocus) override;

#ifdef ORXONOX_OLD_CEGUI
        CEGUI::OgreCEGUIRenderer*            guiRenderer_;          //!< CEGUI's interface to the Ogre Engine
        CEGUI::ResourceProvider*             resourceProvider_;     //!< CEGUI's resource provider
#else
        CEGUI::OgreRenderer*                 guiRenderer_;          //!< CEGUI's interface to the Ogre Engine
        CEGUI::OgreResourceProvider*         resourceProvider_;     //!< CEGUI's resource provider
        Ogre::RenderQueueListener*           rqListener_;           //!< RQ listener so we can draw UNDER Ogre overlays
        CEGUI::OgreImageCodec*               imageCodec_;
#endif
        LuaState*                            luaState_;             //!< LuaState, access point to the Lua engine
        CEGUI::LuaScriptModule*              scriptModule_;         //!< CEGUI's script module to use Lua
        CEGUI::System*                       guiSystem_;            //!< CEGUI's main system
        std::shared_ptr<ResourceInfo>        rootFileInfo_;         //!< Resource information about the root script
        CEGUI::Logger*                       ceguiLogger_;          //!< CEGUI's logger to be able to log CEGUI errors in our log
        int                                  outputLevelCeguiLog_;  //!< CEGUI's log level
        CEGUI::Window*                       rootWindow_;           //!< Root node for all windows
        CEGUI::Window*                       hudRootWindow_;        //!< Root node for the HUD sheets
        CEGUI::Window*                       menuRootWindow_;       //!< Root node for the menu sheets (used by Lua)
        std::map<std::string, PlayerInfo*>   players_;              //!< Stores the player (owner) for each GUI
        Ogre::Camera*                        camera_;               //!< Camera used to render the scene with the GUI

        /// Helper object that executes the surrogate destructor destroy()
        DestructionHelper<GUIManager>        destructionHelper_;

        static GUIManager*                   singletonPtr_s;        //!< Singleton reference to GUIManager

        // The used CEGUI scheme.
        static const std::string defaultScheme_;
        std::string guiScheme_;
        bool oldCEGUI_;

        int numScrollLines_;        ///< How many lines to scroll in a list if the scroll wheel is used
        bool bPreloadMenuSheets_;   ///< If true, menu sheets are pre-loaded during startup

    }; // tolua_export
} // tolua_export

#endif /* _GUIManager_H__ */