#pragma once
#include <Arduino.h>

class Clap {
  public:
    void tick(int val) {
      if (millis() - _tmr >= 10) {
        _tmr = millis();
        int der = val - _prevVal;
        _prevVal = val;
        int signal = 0;
        int front = 0;
        if (der > _trsh) signal = 1;
        if (der < -_trsh) signal = -1;
        if (_prevSignal == 0 && signal == 1) front = 1;
        if (_prevSignal == 0 && signal == -1) front = -1;
        _prevSignal = signal;

        uint32_t deb = millis() - _tmr2;

        if (front == 1 && _state == 0) {
          _state = 1;
          if (!_startClap) {
            _claps = 0;
            _ready = 0;
          }
          _startClap = 1;
          _clap = 0;
          _tmr2 = millis();
        } else if (front == -1 && _state == 1 && deb <= 200) {
          _state = 2;
          _tmr2 = millis();
        } else if (front == 0 && _state == 2 && deb <= 200) {
          _state = 0;
          _claps++;
          _clap = 1;
          _tmr2 = millis();
        } else if (_startClap && deb > _tout) {
          _state = 0;
          _startClap = 0;
          if (_claps != 0) _ready = 1;
        }
      }
    }
    void setTrsh(int trsh) {
      _trsh = trsh;
    }
    void setTimeout(int tout) {
      _tout = tout;
    }
    bool isClap() {
      if (_clap) {
        _clap = 0;
        return 1;
      }
      return 0;
    }
    bool hasClaps(byte claps) {
      if (_ready && _claps == claps) {
        _ready = 0;
        _claps = 0;
        return 1;
      }
      return 0;
    }
    bool hasClaps() {
      return _ready;
    }
    byte getClaps() {
      if (_ready) {
        _ready = 0;
        byte buf = _claps;
        _claps = 0;
        return buf;
      } return 0;
    }

  private:
    uint32_t _tmr = 0, _tmr2 = 0;
    int _prevVal = 0;
    int _trsh = 150;
    byte _state = 0;
    int8_t _prevSignal = 0;
    int _tout = 700;
    byte _claps = 0;
    bool _ready = 0;
    bool _clap = 0;
    bool _startClap = 0;
};