#include <SDL/SDL.h>
#include <iostream>
#include "sound_server.h"

// Naive example of 1-bit audio mixing employing PPM technique
// Adrian Scripca <benishor@gmail.com>

struct oscillator {
  void init(uint16_t sr) { samplerate = sr; }

  void set_frequency(uint16_t frequency) {
    samples_per_cycle = samplerate / frequency;
    //    phase = 0; // hard sync
  }

  bool tick() {
    phase = (phase + 1) % samples_per_cycle;
    return phase < (samples_per_cycle / 2 * duty_cycle / 100);
  }

  uint16_t samples_per_cycle;
  uint16_t duty_cycle = 4;  // percentage
  uint32_t phase = 0;
  uint16_t samplerate;
};

struct synth : sound_producer_1bit {
  explicit synth(uint16_t samplerate) {
    for (auto& o : oscs) {
      o.init(samplerate);
    }
  }

  bool tick() override {
    return oscs[0].tick() | oscs[1].tick() | oscs[2].tick() | oscs[3].tick();
  }

  void major_chord(float root) {
    oscs[0].set_frequency(root);
    oscs[1].set_frequency(root * 5.0f / 4.0f);  // major third
    oscs[2].set_frequency(root * 3.0f / 2.0f);  // perfect fifth
    oscs[3].set_frequency(root * 2.0f);         // octave
  }

  void minor_chord(float root) {
    oscs[0].set_frequency(root);
    oscs[1].set_frequency(root * 6.0f / 5.0f);  // minor third
    oscs[2].set_frequency(root * 3.0f / 2.0f);  // perfect fifth
    oscs[3].set_frequency(root * 2.0f);         // octave
  }

  oscillator oscs[4];
};

int main(int argc, char* argv[]) {
  std::cout << "1bit PPM technique example" << std::endl;
  // setup
  const uint16_t SampleRate = 44100;

  synth instrument{SampleRate};
  sound_server_1bit sound_server{SampleRate, instrument};

  // fool around. Gmaj, Cmaj, Emaj (la bamba)
  instrument.major_chord(98);
  SDL_Delay(1000);

  instrument.major_chord(130.81);
  SDL_Delay(1000);

  instrument.major_chord(146.83);
  SDL_Delay(1000);

  return 0;
}