const int buzzerPin = 26;  // Using GPIO 13 for the buzzer (you can choose any available GPIO pin)
const int inpin = 2;      // Using GPIO 12 for the input button (you can choose any available GPIO pin)

const int songLengthAmazingGrace = 33;

char notesAmazingGrace[]  = "gCECEDCaggCECEDGEGECEDCaggCECEDC ";
int beatsAmazingGrace[] = {2, 4, 1, 1, 4, 2, 4, 2, 4, 2, 4, 1, 1, 4, 2, 10, 2, 4, 1, 1, 4, 2, 4, 2, 4, 2, 4, 1, 1, 4, 2, 8, 8};

int tempo = 300;
bool buttonPressed = false;

void setup() {
  pinMode(buzzerPin, OUTPUT);
  pinMode(inpin, INPUT);
}

void loop() {
  static unsigned long lastDebounceTime = 0;
  static unsigned long debounceDelay = 50;

  int reading = digitalRead(inpin);

  // Check if button press state changed and debounce
  if (reading == HIGH && !buttonPressed && (millis() - lastDebounceTime) > debounceDelay) {
    buttonPressed = true;
    lastDebounceTime = millis();
    play_music(); // Play music when button is pressed
  }
  else if (reading == LOW) {
    buttonPressed = false; // Reset button state when released
  }
}

void play_music() {
  int duration;
  for (int i = 0; i < songLengthAmazingGrace; i++) {
    duration = beatsAmazingGrace[i] * tempo;
    
    if (notesAmazingGrace[i] == ' ') {
      delay(duration);
    }
    else {
      int freq = frequency(notesAmazingGrace[i]);
      if (freq > 0) {
        ledcWriteTone(0, freq);  // Play the note on channel 0
      }
      delay(duration);
      ledcWriteTone(0, 0);  // Stop the tone after the note duration
    }
    delay(tempo / 10);  // Small pause between notes
  }
}

int frequency(char note) {
  int frequencies[] = {131, 147, 165, 175, 196, 220, 247, 262, 294, 330, 349, 392, 440, 494};
  char names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C', 'D', 'E', 'F', 'G', 'A', 'B'};

  for (int i = 0; i < 14; i++) {
    if (names[i] == note) {
      return frequencies[i];
    }
  }

  return 0; // Return 0 if no match found
}