// existência de componentes
#define _TEM_BUZZER false
#define _TEM_CHAVE  false

// pinos
#define PINO_BUZZER 8
#define PINO_CHAVE  4

// Constantes para notas musicais
#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978


int nota[] = {
  NOTE_E7, NOTE_E7, 0, NOTE_E7,
  0, NOTE_C7, NOTE_E7, 0,
  NOTE_G7, 0, 0, 0,
  NOTE_G6, 0, 0, 0,
  
  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,
  
  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0,
  
  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,
  
  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0
};

int tempo[] = {
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  
  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  
  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12
};


void setup() {
  setupChave(PINO_CHAVE);
  setupBuzzer(PINO_BUZZER);
}

void loop() {
  for (int i = 0; i < sizeof(nota) / sizeof(int); i++ ) {
    if (lerChave(PINO_CHAVE) == LOW) {
      break; // interrompe o for, seguindo para o fim do loop.
    }
    tocar(8, nota[i], 1000 / tempo[i]);
  }
}

void setupChave(int pino) {
  if (_TEM_CHAVE) {
    pinMode(pino, INPUT);
  }
  else {
    if (!Serial) {
      Serial.begin(9600);
    }
    Serial.println("Chave do pino " + String(pino) + " simulada.");
    Serial.println("Para ligá-la, digite L" + String(pino) + ".");
    Serial.println("Para desligá-la, digite D" + String(pino) + ".");
  }
}

int lerChave(int pino) {
  if (_TEM_CHAVE) {
    return digitalRead(pino);
  }
  else {
    static int estadoChave = HIGH;
    if (Serial.available() > 0) {
      String msg = Serial.readString();
      if (msg == "L" + String(pino) or msg == "l" + String(pino)) {
        estadoChave = HIGH;
      }
      else if (msg == "D" + String(pino) or msg == "d" + String(pino)) {
        estadoChave = LOW;
      }
    }
    return estadoChave;
  }
}

void setupBuzzer(int pino) {
  if (_TEM_BUZZER) {
    pinMode(pino, OUTPUT);
  }
  else {
    if (!Serial) {
      Serial.begin(9600);
    }
    
    Serial.println("Buzzer do pino " + String(pino) + " simulado.");
  }
}

void tocar(int pino, int tom, int tempo) {
  if (_TEM_BUZZER) {
    tone(pino, tom, tempo);
    delay(tempo * 1.30);
  }
  else {
    Serial.print("BUZZER (" + String(pino) + "): ");
    Serial.print("tom=" + String(tom));
    Serial.println(", tempo=" + String(tempo) + ".");
  }
  
}