#include <Adafruit_NeoPixel.h>

#define PIN         5
#define NUMPIXELS   12
#define DEFAULT_BRIGHTNESS 75

Adafruit_NeoPixel ring(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

String lastColor = "green";
int currentBrightness = DEFAULT_BRIGHTNESS;

uint32_t getColorFromString(String colorName) {
  if (colorName == "red") return ring.Color(255, 0, 0);
  if (colorName == "green") return ring.Color(0, 255, 0);
  if (colorName == "blue") return ring.Color(0, 0, 255);
  if (colorName == "purple") return ring.Color(148, 0, 211);
  return ring.Color(0, 0, 0); 
}

void applyColor(String color) {
  if (color != "off"){
    lastColor = color;
  }
  if (color == "red") {
    ring.fill(ring.Color(255, 0, 0));
  } else if (color == "green") {
    ring.fill(ring.Color(0, 255, 0));
  } else if (color == "blue") {
    ring.fill(ring.Color(0, 0, 255));
  } else if (color == "purple") {
    ring.fill(ring.Color(148, 0, 211));
  }
  if (color == "off") {
    ring.clear();
  }
  ring.show();
}

uint32_t Wheel(byte pos) {
  pos = 255 - pos;
  if(pos < 85) {
    return ring.Color(255 - pos * 3, 0, pos * 3);
  }
  if(pos < 170) {
    pos -= 85;
    return ring.Color(0, pos * 3, 255 - pos * 3);
  }
  pos -= 170;
  return ring.Color(pos * 3, 255 - pos * 3, 0);
}

void rainbow(uint8_t wait) {
  for(uint16_t j = 0; j <= 255; j++) {
    for(uint16_t i = 0; i < ring.numPixels(); i++) {
      ring.setPixelColor(i, Wheel((i + j) & 255));
    }
    ring.show();
    delay(wait);
  }
}




void turnClockwise(String color) {

  for (int i = 0; i < NUMPIXELS; i++) {
    ring.clear();
    ring.setPixelColor(i, getColorFromString(color)); 
    ring.show();
    delay(100);
  }
  ring.clear();
  ring.show();
}

void setup() {
  Serial.begin(115200);
  ring.begin();
  ring.setBrightness(currentBrightness);
  ring.clear();
  ring.show();

  Serial.println("Enter color (red, blue, green, purple), change brightness with >>brightness value<< between 0 and 100 or turn device off by entering off");
}

void loop() {
  if (Serial.available()) {
    String input = Serial.readStringUntil('\n');
    input.trim();
    input.toLowerCase();

    if (input.startsWith("br")) {
      int value = input.substring(11).toInt();
      value = constrain(value, 0, 100);
      currentBrightness = map(value, 0, 100, 0, 255);
      ring.setBrightness(currentBrightness);
      Serial.print("Brightness: ");
      Serial.println(value);
      applyColor(lastColor);
    } 
      else if (input == "on") {
        applyColor(lastColor);
      }
      else if (input == "turn") {
        turnClockwise(lastColor);
        applyColor(lastColor);
      }
      else if (input == "rainbow") {
        rainbow(50);
      }
       else {
        applyColor(input);
      }  
  }
}