/***************************************************************************

    source::worx PiGPIO
    Copyright © 2022 c.holzheuer
    chris@sourceworx.org

    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.

***************************************************************************/


#ifndef SWPIGPIO_H
#define SWPIGPIO_H

#include <QObject>

class PiGPIOFactory;
class PiGPIOLinFactory;
class PiGPIOWinFactory;
class PiGPIOWidget;




#ifdef Q_OS_WIN

// Fake4Win
typedef void (*CBFuncEx_t)( int pi, unsigned user_gpio, unsigned level, uint32_t tick, void * userdata );

extern int PI_INPUT;
extern int PI_PUD_UP;
extern int EITHER_EDGE;
extern int PI_TIMEOUT;
//int PI_TIMEOUT = 42;

extern int set_mode(int,int,int);
extern int set_pull_up_down(int,int,int);
extern int set_glitch_filter(int,int,int);
extern int callback_cancel(int);
extern int callback_ex(int,unsigned,int,CBFuncEx_t,void*);
extern int gpio_read(int,int);

#endif  //Q_OS_WIN


/**
 * @brief @brief Prototypische Implementierung eines Wrappers für die 'pigpiod' library.
 */

class PiGPIO
{

public:

    static PiGPIO& Instance()
    {
        static PiGPIO _Instance;  // Guaranteed to be destroyed.
        return _Instance;         // Instantiated on first use.
    }


    PiGPIO( PiGPIO const& )       = delete;
    void operator=(PiGPIO const&) = delete;

    ~PiGPIO();

    int PI;

private:

    PiGPIO();

    bool _initCalled = false;

};


//---------------------------------------------------------------------

/**

             +---------+         +---------+      0
             |         |         |         |
   A         |         |         |         |
             |         |         |         |
   +---------+         +---------+         +----- 1

       +---------+         +---------+            0
       |         |         |         |
   B   |         |         |         |
       |         |         |         |
   ----+         +---------+         +---------+  1

*/

/**
 * @brief Implentiert die Anbindung eines RotaryDials (Dreh-Drück Regler)
 * an die Benutzeroberfläche
 *
 * Version über den 'pigpiod' _ohne_ direkten Hardwarezugriff (welcher root-Rechte
 * benötigen würde)
 */

class PiGRotaryDial : public QObject
{
    Q_OBJECT

public:

    explicit PiGRotaryDial( unsigned dialA, unsigned dialB, unsigned button, QObject* parent = nullptr );
    virtual ~PiGRotaryDial();
    void setGlitchFilter( int glitch );

signals:

    void clicked();
    void deltaChanged( int value );

protected:

    void pulse( unsigned gpio, unsigned level );
    void handleClick( unsigned level );
    //void handlePulse( int value );

    // Need a static callback to link with C.
    static void PiGPIOPulse( int Pi, unsigned gpio, unsigned level, uint32_t tick, void *user );

    /*
    constexpr const static int Transits[16]=
    {
        // 0000 0001 0010 0011 0100 0101 0110 0111
              0,  -1,   1,   0,   1,   0,   0,  -1,
        // 1000 1001 1010 1011 1100 1101 1110 1111
             -1,   0,   0,   1,   0,   1,  -1,   0
    };
    */


    int         _Pi = -1;
    unsigned    _dialA = -1;
    unsigned    _dialB = -1;
    unsigned    _button = -1;
    int         _callbackIdA = -1;
    int         _callbackIdB = -1;
    int         _callbackIdC = -1;
    int         _levA = -1;
    int         _levB = -1;
    int         _oldState = -1;
    int         _glitch = -1;
    int         _step = 0;
    int         _oldStep = 0;

    bool        _pressed = false;


};


#endif // SWPIGPIO_H