#define NUM_PIXELS 16
#define NUM_PLAYERS 4
#define NUM_COLORS 7

#include <Adafruit_NeoPixel.h>
#include <Bounce2.h> // https://github.com/thomasfredericks/Bounce2/archive/refs/heads/master.zip

Bounce2::Button button = Bounce2::Button();

const byte ledPin = 6;
const byte buttonPin = 3;
const int potPin[NUM_PLAYERS] = {A0, A1, A2, A3};

int colorSelected[NUM_PLAYERS] = {0};

Adafruit_NeoPixel pixels(NUM_PIXELS, ledPin, NEO_GRB + NEO_KHZ800);

uint32_t red = pixels.Color(255, 0, 0);
uint32_t green = pixels.Color(0, 255, 0);
uint32_t blue = pixels.Color(0, 0, 255);
uint32_t yellow = pixels.Color(255, 255, 0);
uint32_t white = pixels.Color(255, 255, 255);
uint32_t pink = pixels.Color(255, 0, 100);
uint32_t cyan = pixels.Color(0, 255, 255);

uint32_t colors[NUM_COLORS] = {red, green, blue, yellow, white, pink, cyan};

int potValue[NUM_PLAYERS] = {0};
int previousPotValue[NUM_PLAYERS] = {0};
bool firstTime = true;

void setup() {

  Serial.begin(9600);

  button.attach(buttonPin, INPUT_PULLUP);
  button.interval(5);
  button.setPressedState(LOW);

  for (byte i = 0; i < NUM_PLAYERS; i++)
  {
    pinMode(potPin[i], INPUT);
  }

  pixels.begin();
  pixels.setBrightness(255);
  pixels.show();
}

void loop() {
  bool changed = false;

  for (byte i = 0; i < NUM_PLAYERS; i++)
  {
    potValue[i] = analogRead(potPin[i]);

    if (potValue[i] != previousPotValue[i])
    {
      previousPotValue[i] = potValue[i];
      changed = true;
    }

    colorSelected[i] = map(potValue[i], 0, 1023, 0, NUM_COLORS - 1);
  }

  if (changed == true)
  {
    int offset = 0;

    Serial.println("New colors:");
    for (byte j = 0; j < NUM_PLAYERS; j++)
    {
      for (byte i = 0; i < (NUM_PIXELS / NUM_PLAYERS); i++)
      {
        pixels.setPixelColor(i + offset, colors[colorSelected[j]]);
      }
      Serial.print("Pixel ");
      Serial.print(j);
      Serial.print(" = ");
      Serial.println(colors[colorSelected[j]]);
      offset += 4;
    }
    Serial.println("");
    pixels.show();
    changed = false;
  }

  button.update();

  if (button.pressed()) {

    if (firstTime == true)
    {
      firstTime = false;

      Serial.println("Applying colors!");

      pixels.clear();
      pixels.show();

      int offset = 0;

      for (byte j = 0; j < NUM_PLAYERS - 1; j++)
      {
        for (byte i = 0; i < NUM_PLAYERS; i++)
        {
          pixels.setPixelColor(i + offset + 4, colors[colorSelected[i]]);
          Serial.print("Pixel ");
          Serial.print(i + offset + 4);
          Serial.print(" = ");
          Serial.println(colors[colorSelected[i]]);
        }
        offset += NUM_PLAYERS;
        Serial.println();
      }
      pixels.show();
    }
    else
    {
      firstTime = true;
      pixels.clear();
      pixels.show();
    }
  }
}