/**
   Mini piano for Arduino.

   You can control the colorful buttons with your keyboard:
   After starting the simulation, click anywhere in the diagram to focus it.
   Then press any key between 1 and 8 to play the piano (1 is the lowest note,
   8 is the highest).

   Copyright (C) 2021, Uri Shaked. Released under the MIT License.
*/

#include "pitches.h"

#define SPEAKER_PIN 8

const uint8_t buttonPins[] = { 12, 11, 10, 9, 7, 6, 5, 4 };
const int buttonTones[] = {
  NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
  NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
const int numTones = sizeof(buttonPins) / sizeof(buttonPins[0]);

int n = 1000;
int hn = n/2;
int qn = n/4;
int qnd = (int)(qn*1.5);
int en = n/8;
int enp = n/8 + 150;
int sn = n/16;
enum notes {D, E, F, G, A, B, C, Dp};

void playNote(int note, int ntype) {
  tone(SPEAKER_PIN, note);
  delay(ntype);
  noTone(SPEAKER_PIN);
  if (ntype != enp) {
    delay(150);
  }
}

void playSong() {
  int notesheet[62] = { B, B, C, Dp, 
                        Dp, C, B, A, 
                        G, G, A, B, 
                        B, A, A, 
                        B, B, C, Dp,
                        Dp, C, B, A,
                        G, G, A, B,
                        A, G, G, 
                        A, A, B, G,
                        A, B, C, B, G,
                        A, B, C, B, A,
                        G, A, D,
                        B, B, C, Dp,
                        Dp, C, B, A,
                        G, G, A, B,
                        A, G, G};

  int noteTypes[62] = { qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qnd, en, hn,
                        qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qnd, en, hn,
                        qn, qn, qn, qn,
                        qn, enp, en, qn, qn,
                        qn, enp, en, qn, qn,
                        qn, qn, hn,
                        qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qn, qn, qn, qn,
                        qnd, en, hn};

  for (int i = 0; i < 62; i++) {
    Serial.println(notesheet[i]);
    playNote(buttonTones[notesheet[i]], noteTypes[i]);
  }
}

void setup() {
  for (uint8_t i = 0; i < numTones; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  playSong();
  delay(70000);
  int pitch = 0;
  for (uint8_t i = 0; i < numTones; i++) {
    if (digitalRead(buttonPins[i]) == LOW) {
      pitch = buttonTones[i];
    }
  }
  if (pitch) {
    tone(SPEAKER_PIN, pitch);
  } else {
    noTone(SPEAKER_PIN);
  }
}