/*
 * Based on the code "rgb_spectrum.c" by jamesotron. https://gist.github.com/jamesotron/766994
 * Adapted by Rodrigo Gamboa. FabAcademy2019.
 * http://fabacademy.org/2019/labs/ied/students/rodrigo-gamboa/week12.html
*/

const int redPin = 2;
const int greenPin = 0;
const int bluePin = 1;

int buttonPin1 = 3;
int buttonPin2 = 4;
int buttonState1, buttonState2 = 0;
int lastButtonState1, lastButtonState2 = 0;
int count1, count2 = 0;

void setup() {
  // Start off with the LED off.
  setColourRgb(0, 0, 0);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  digitalWrite(redPin, HIGH);
  digitalWrite(greenPin, HIGH);
  digitalWrite(bluePin, HIGH);
}

void loop() {
  buttons();
  unsigned int rgbColour[3];

  // Start off with red.
  rgbColour[0] = 255;
  rgbColour[1] = 0;
  rgbColour[2] = 0;

  // Choose the colours to increment and decrement.
  for (int decColour = 0; decColour < 3; decColour += 1) {
    int incColour = decColour == 2 ? 0 : decColour + 1;

    // cross-fade the two colours.
    for (int i = 0; i < 255; i += 1) {
      rgbColour[decColour] -= 1;
      rgbColour[incColour] += 1;

      if (count1 == 1 && count2 == 1)
      {
        setColourRgb(rgbColour[0], rgbColour[1], rgbColour[2]);
        delay(5);
      }
    }
  }
}

void setColourRgb(unsigned int red, unsigned int green, unsigned int blue) {

  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);

}


void buttons()
{
  buttonState1 = digitalRead(buttonPin1);
  if (buttonState1 != lastButtonState1)
  {
    if (buttonState1 == HIGH)
    {
      count1 = 1;
    }
  }
  lastButtonState1 = buttonState1;


  buttonState2 = digitalRead(buttonPin2);
  if (buttonState2 != lastButtonState2)
  {
    if (buttonState2 == HIGH)
    {
      count2 = 1;
    }
  }
  lastButtonState2 = buttonState2;
}