/* Copyright 2013-2019 Matt Tytel
 *
 * vital 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.
 *
 * vital 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 vital.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "processor.h"
#include "synth_filter.h"

#include "futils.h"
#include "one_pole_filter.h"

namespace vital {

  class DiodeFilter : public Processor, public SynthFilter {
    public:
      static constexpr mono_float kMinResonance = 0.7f;
      static constexpr mono_float kMaxResonance = 17.0f;
      static constexpr mono_float kMinCutoff = 1.0f;
      static constexpr mono_float kHighPassFrequency = 20.0f;

      DiodeFilter();
      virtual ~DiodeFilter() { }

      virtual Processor* clone() const override { return new DiodeFilter(*this); }
      virtual void process(int num_samples) override;

      void setupFilter(const FilterState& filter_state) override;

      force_inline void tick(poly_float audio_in, poly_float coefficient,
                             poly_float high_pass_ratio, poly_float high_pass_amount,
                             poly_float high_pass_feedback_coefficient,
                             poly_float resonance, poly_float drive);

      void reset(poly_mask reset_mask) override;
      void hardReset() override;

      poly_float getResonance() { return resonance_; }
      poly_float getDrive() { return drive_; }
      poly_float getHighPassRatio() { return high_pass_ratio_; }
      poly_float getHighPassAmount() { return high_pass_amount_; }

    private:
      poly_float resonance_;
      poly_float drive_;
      poly_float post_multiply_;
      poly_float high_pass_ratio_;
      poly_float high_pass_amount_;
      poly_float feedback_high_pass_coefficient_;

      static force_inline poly_float saturate(poly_float value) {
        return futils::tanh(value);
      }

      static force_inline poly_float saturate2(poly_float value) {
        return utils::clamp(value, -1.0f, 1.0f);
      }

      OnePoleFilter<> high_pass_1_;
      OnePoleFilter<> high_pass_2_;

      OnePoleFilter<> high_pass_feedback_;
      OnePoleFilter<saturate> stage1_;
      OnePoleFilter<> stage2_;
      OnePoleFilter<> stage3_;
      OnePoleFilter<saturate2> stage4_;

      JUCE_LEAK_DETECTOR(DiodeFilter)
  };
} // namespace vital