/*
 *   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
 *   Co-authors:
 *      ...
 *
 */

#ifndef _KeyBinder_H__
#define _KeyBinder_H__

#include "InputPrereqs.h"

#include <cassert>
#include <string>
#include <vector>
#include <map>
#include <memory>

#include "InputHandler.h"
#include "Button.h"
#include "HalfAxis.h"
#include "InputCommands.h"
#include "JoyStickQuantityListener.h"

// tolua_begin
namespace orxonox
{
    // tolua_end
    /**
    @brief
        Maps mouse, keyboard and joy stick input to command strings and executes them.

        The bindings are stored in ini-files (like the one for configValues) in the config Path.
    @remarks
        You cannot change the filename because the KeyBinderManager maps these filenames to the
        KeyBinders. If you need to load other bindings, just create a new one.
    */
    class _CoreExport KeyBinder // tolua_export
        : public InputHandler, public JoyStickQuantityListener
    { // tolua_export
    public:
        KeyBinder (const std::string& filename);
        virtual ~KeyBinder();

        void clearBindings();
        bool setBinding(const std::string& binding, const std::string& name, bool bTemporary = false);
        std::string getBinding(const std::string& commandName); //tolua_export
        std::string getBinding(const std::string& commandName, unsigned int index); //tolua_export
        std::string getBindingReadable(const std::string& commandName); //tolua_export
        unsigned int getNumberOfBindings(const std::string& commandName); //tolua_export

        const std::string& getBindingsFilename()
            { return this->filename_; }
        void setConfigValues();
        void resetJoyStickAxes();
        void resetMouseAxes();

        void changeMode(ConsoleCommand* command, KeybindMode::Value mode);

    protected: // functions
        void loadBindings();
        void buttonThresholdChanged();
        void initialiseJoyStickBindings();
        void compilePointerLists();
        // from JoyStickQuantityListener interface
        virtual void JoyStickQuantityChanged(const std::vector<JoyStick*>& joyStickList) override;

        virtual void allDevicesUpdated(float dt) override;
        virtual void mouseUpdated(float dt) override;
        virtual void joyStickUpdated(unsigned int joyStick, float dt) override;
        // internal
        void tickHalfAxis(HalfAxis& halfAxis);

        virtual void buttonPressed (const KeyEvent& evt) override;
        virtual void buttonReleased(const KeyEvent& evt) override;
        virtual void buttonHeld    (const KeyEvent& evt) override;

        virtual void buttonPressed (MouseButtonCode::ByEnum button) override;
        virtual void buttonReleased(MouseButtonCode::ByEnum button) override;
        virtual void buttonHeld    (MouseButtonCode::ByEnum button) override;
        virtual void mouseMoved    (IntVector2 abs, IntVector2 rel, IntVector2 clippingSize) override;
        virtual void mouseScrolled (int abs, int rel) override;

        virtual void buttonPressed (unsigned int device, JoyStickButtonCode::ByEnum button) override;
        virtual void buttonReleased(unsigned int device, JoyStickButtonCode::ByEnum button) override;
        virtual void buttonHeld    (unsigned int device, JoyStickButtonCode::ByEnum button) override;
        virtual void axisMoved     (unsigned int device, unsigned int axis, float value) override;

    protected: // variables
        //! Currently active joy sticks
        std::vector<JoyStick*>  joySticks_;

        //! Actual key bindings for keys on the keyboard
        Button keys_            [KeyCode::numberOfKeys];
        //! Number of mouse buttons in KeyBinder (+4)
        static const unsigned int numberOfMouseButtons_ = MouseButtonCode::numberOfButtons + 4;
        //! Actual key bindings for mouse buttons including the wheel(s)
        Button mouseButtons_    [numberOfMouseButtons_];
        //! Actual key bindings for mouse axes
        HalfAxis mouseAxes_     [MouseAxisCode::numberOfAxes * 2];

        //! Helper class to use something like std:vector<Button[64]>
        struct JoyStickButtonVector
        {
            Button& operator[](unsigned int index) { return buttons[index]; }
            Button buttons[JoyStickButtonCode::numberOfButtons];
        };
        //! Actual key bindings for joy stick buttons
        std::vector<std::shared_ptr<JoyStickButtonVector>> joyStickButtons_;
        //! Helper class to use something like std:vector<HalfAxis[48]>
        struct JoyStickAxisVector
        {
            HalfAxis& operator[](unsigned int index) { return halfAxes[index]; }
            HalfAxis halfAxes[JoyStickAxisCode::numberOfAxes * 2];
        };
        //! Actual key bindings for joy stick axes (and sliders)
        std::vector<std::shared_ptr<JoyStickAxisVector>> joyStickAxes_;

        //! Pointer map with all Buttons, including half axes
        std::map<std::string, Button*> allButtons_;
        //! Pointer list with all half axes
        std::vector<HalfAxis*> allHalfAxes_;
        //! Maps input commands to all Button names, including half axes
        std::map< std::string, std::vector<std::string>> allCommands_;

        /**
        @brief
            Commands that have additional parameters (axes) are executed at the end of
            update() so that all values can be buffered for single execution.
        */
        std::vector<BufferedParamCommand*> paramCommandBuffer_;

        //! Keeps track of the absolute mouse value
        float mousePosition_[2];
        //! Used to derive mouse input if requested
        int mouseRelative_[2];
        float deriveTime_;

        //! Name of the file used in this KeyBinder (constant!)
        const std::string filename_;
        //! Config file used. nullptr in case of KeyDetector. Also indicates whether we've already loaded.
        ConfigFile* configFile_;
        //! Config file from the data directory that only serves as fallback
        ConfigFile* fallbackConfigFile_;

    private:
        void addButtonToCommand(const std::string& command, Button* button);

        //##### ConfigValues #####
        //! Whether to filter small value analog input
        bool bFilterAnalogNoise_;
        //! Threshold for analog triggers until which the state is 0.
        float analogThreshold_;
        //! Threshold for analog triggers until which the button is not pressed.
        float buttonThreshold_;
        //! Derive mouse input for absolute values?
        bool bDeriveMouseInput_;
        //! Accuracy of the mouse input deriver. The higher the more precise, but laggier.
        float derivePeriod_;
        //! mouse sensitivity
        float mouseSensitivity_;
        //! mouse sensitivity if mouse input is derived
        float mouseSensitivityDerived_;
        //! Equals one step of the mouse wheel
        int mouseWheelStepSize_;

        //! Multiplication of mouse sensitivity and clipping size
        float totalMouseSensitivity_;

        //##### Constant config variables #####
        // Use some value at about 1000. This can be configured with mouseSensitivity_ anyway.
        static const int mouseClippingSize_ = 1024;
    };// tolua_export


    inline void KeyBinder::buttonPressed (const KeyEvent& evt)
    { assert(!keys_[evt.getKeyCode()].name_.empty()); keys_[evt.getKeyCode()].execute(KeybindMode::OnPress, 1); }

    inline void KeyBinder::buttonReleased(const KeyEvent& evt)
    { assert(!keys_[evt.getKeyCode()].name_.empty()); keys_[evt.getKeyCode()].execute(KeybindMode::OnRelease, 0); }

    inline void KeyBinder::buttonHeld    (const KeyEvent& evt)
    { assert(!keys_[evt.getKeyCode()].name_.empty()); keys_[evt.getKeyCode()].execute(KeybindMode::OnHold); }


    inline void KeyBinder::buttonPressed (MouseButtonCode::ByEnum button)
    { mouseButtons_[button].execute(KeybindMode::OnPress, 1); }

    inline void KeyBinder::buttonReleased(MouseButtonCode::ByEnum button)
    { mouseButtons_[button].execute(KeybindMode::OnRelease, 0); }

    inline void KeyBinder::buttonHeld    (MouseButtonCode::ByEnum button)
    { mouseButtons_[button].execute(KeybindMode::OnHold); }


    inline void KeyBinder::buttonPressed (unsigned int device, JoyStickButtonCode::ByEnum button)
    { (*joyStickButtons_[device])[button].execute(KeybindMode::OnPress, 1); }

    inline void KeyBinder::buttonReleased(unsigned int device, JoyStickButtonCode::ByEnum button)
    { (*joyStickButtons_[device])[button].execute(KeybindMode::OnRelease, 0); }

    inline void KeyBinder::buttonHeld    (unsigned int device, JoyStickButtonCode::ByEnum button)
    { (*joyStickButtons_[device])[button].execute(KeybindMode::OnHold); }

    inline void KeyBinder::allDevicesUpdated(float dt)
    {
        // execute all buffered bindings (additional parameter)
        for (BufferedParamCommand* command : paramCommandBuffer_)
        {
            command->rel_ *= dt;
            command->execute();
        }

        // always reset the relative movement of the mouse
        for (HalfAxis& axis : mouseAxes_)
            axis.relVal_ = 0.0f;
    }
}// tolua_export

#endif /* _KeyBinder_H__ */