const int LedR = 5;
const int LedG = 4;
const int LedB = 3;
const int buzz = 2;
const int sensor = A0;

void setup() {
  pinMode(LedR, OUTPUT);
  pinMode(LedG, OUTPUT);
  pinMode(LedB, OUTPUT);
  pinMode(buzz, OUTPUT);
  pinMode(sensor, INPUT);
}

void loop() {
  int value = analogRead(sensor);
  int lux = map(value, 0, 1023, 0, 100);

  if (lux < 40) {
    int melody[] = {262, 294, 330, 349, 392, 440, 494, 523};
    int noteDurations[] = {500, 500, 500, 500, 500, 500, 500, 500};
    int numNotes = sizeof(melody) / sizeof(melody[0]);

    unsigned long currentMillis = millis();
    unsigned long previousMillis = 0;
    int thisNote = 0;

    while (thisNote < numNotes) {
      currentMillis = millis();
      if (currentMillis - previousMillis >= noteDurations[thisNote]) {
        previousMillis = currentMillis;
        tone(buzz, melody[thisNote]);
        thisNote++;
      }

      for (int i = 0; i < 256; i++) {
        analogWrite(LedR, i);
        analogWrite(LedG, 255 - i);
        analogWrite(LedB, 0);
        delay(5);
      }
      for (int i = 0; i < 256; i++) {
        analogWrite(LedR, 255 - i);
        analogWrite(LedG, 0);
        analogWrite(LedB, i);
        delay(5);
      }
      for (int i = 0; i < 256; i++) {
        analogWrite(LedR, 0);
        analogWrite(LedG, i);
        analogWrite(LedB, 255 - i);
        delay(5);
      }
    }
    noTone(buzz);

  } else if (lux >= 40 && lux < 80) {
    int melody[] = {262, 294, 330, 349, 392, 440, 494, 523};
    int noteDurations[] = {500, 500, 500, 500, 500, 500, 500, 500};
    int numNotes = sizeof(melody) / sizeof(melody[0]);

    for (int thisNote = 0; thisNote < numNotes; thisNote++) {
      tone(buzz, melody[thisNote]);
      delay(noteDurations[thisNote]);
      noTone(buzz);
      delay(20);
    }
  } else {
    noTone(buzz);
    analogWrite(LedR, 0);
    analogWrite(LedG, 0);
    analogWrite(LedB, 0);
  }
}