/*
   MicroDexed

   MicroDexed is a port of the Dexed sound engine
   (https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6 with audio shield.
   Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android

   (c)2018 H. Wirtz <wirtz@parasitstudio.de>

   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 3 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

*/

#ifndef SOFTEN_VALUE_H_INCLUDED

template <class T>
class SoftenValue
{
  public:
    SoftenValue(uint16_t steps = 10);
    SoftenValue(T from, T to, uint16_t steps = 10)
    {
      _from = from;
      _to = to;
      _steps = steps;
      _diff = (from - to) / _steps;

      _calculate();
    }

    void update_to(T to)
    {
      _to = to;
      _calculate();
    }

    void update_steps(uint16_t steps)
    {
      _steps = steps;
      _calculate();
    }

    void tick(void)
    {
      if (_steps > 0)
      {
        _from -= _diff;
        _steps--;
      }
    }

    bool running(void)
    {
      if (_steps > 0)
        return (true);
      else
        return (false);
    }

    uint16_t steps(void)
    {
      return (_steps);
    }

    T value(void)
    {
      if (_steps == 0)
        return (_to);

      if (std::is_same<T, float>::value)
        return (_from);
      else
        return (round(_from));
    }

  protected:
    float _from;
    float _to;
    uint16_t _steps;
    float _diff;

    void _calculate(void)
    {
      if (_from == _to || _steps <= 0)
      {
        _steps = 0;
        _diff = 0.0;
      }
      else
        _diff = (_from - _to) / _steps;
    }
};

#endif