/*
 * Example program that fades LED on and off, as if it were "breathing".
 * (c) 2022 Nathan "nwb99" Barnett
 * MIT License
*/

const float valueRange = 255;
const float conversionFactor = PI / valueRange; // Conversion factor from 0-63 to radians


class OutputState {
  private:
    int current_pos = 0;
    int change_direction = 1;
    unsigned long previousMillis = 0;
    const int inputPin;
    const int outputPin;
  public:
    OutputState(int inPin, int outPin) : inputPin(inPin), outputPin(outPin) {
      // inputPin = inPin;
      // outputPin = outPin;
      pinMode(inPin,INPUT);
      pinMode(outPin,OUTPUT);
    }

    int timeUpdate(long currentMillis) {

      const int potValue = analogRead(inputPin);
      const int interval = map(potValue, 0, 1023, 1, 10);

      // You can handle the debounce of the button directly
      // in the class, so you don't have to think about it
      const long intervalDelta = currentMillis - previousMillis;
      if (intervalDelta >= interval) {
        previousMillis = currentMillis;

        current_pos = (current_pos + change_direction*(intervalDelta/interval));
        if (current_pos <= 0)
        {
          change_direction = 1;
        }
        else if (current_pos >= valueRange)
        {
          change_direction = -1;
        }

        const int triangleValue = current_pos;
        const float radiansValue = (triangleValue-(valueRange/2)) * conversionFactor;

        // Calculate the sine of the radians value
        const float sineValue = sin(radiansValue);

        // Map the sine value to a PWM range (0-255)
        const int pwmValue = (sineValue+1)*(valueRange/2);

        const int squareValue = sineValue > 0 ? valueRange : 0;

        analogWrite(outputPin, pwmValue);
      }
    }
    
}; // don't forget the semicolon at the end of the class

OutputState outputA(3,1);
OutputState outputB(2,0);

void setup() {

//   pinMode(1,OUTPUT);
//   pinMode(2,OUTPUT);
//   pinMode(3,INPUT);
//   pinMode(4,INPUT);
}

void loop() {
  /*
  can connect a 5V LED in series with like a 330 Ohm resistor to pin 6 (P0W)
  on the MCP4151. This should cause a "breathing" LED effect.
  Furthermore, 'pot.getCurValue()' is reading the value from the IC.
  The chip stores the wiper as an 8-bit value at address 00h.
  Valid values are 0-255 (or 0x0 to 0xFF, if you prefer).
  For my test LED, 87 was basically 'off', given the voltage was too low.
  */
  const unsigned long currentMillis = millis();
  outputA.timeUpdate(currentMillis);
  outputB.timeUpdate(currentMillis);
}