#include "pitches.h"

// change this to make the song slower or faster
int tempo = 108;
int beat = 4;
double secends = 60000;

const byte ledPins[] = {8, 9, 10, 11};//-define pin numbers for LEDs
const byte buttonPins[] = {1, 2, 3, 4};//-define pin numbers for buttons
int buzzer = 5;


#define MAX_GAME_LENGTH 100

byte gameSequence[MAX_GAME_LENGTH] = {0};
byte gameIndex = 0;

// notes of the moledy followed by the duration.
// a 4 means a quarter note, 8 an eighteenth , 16 sixteenth, so on
// !!negative numbers are used to represent dotted notes,
// so -4 means a dotted quarter note, that is, a quarter plus an eighteenth!!



void setup() 
{
  Serial.begin(9600);
  
  for (byte i = 0; i < 4; i++) 
  {
    pinMode(ledPins[i], OUTPUT);
    pinMode(buttonPins[i], INPUT_PULLUP);
  }

  playStartMusic();

  randomSeed(analogRead(A0));
}




const PROGMEM int StartMusic[] = 
{
  NOTE_AS4,8, NOTE_AS4,8, NOTE_AS4,8,//1
  NOTE_F5,2, 
  NOTE_C6,2,
  NOTE_AS5,8, 
  NOTE_A5,8, 
  NOTE_G5,8, 
  NOTE_F6,2, 
  REST,4  
};

void playStartMusic()
{
  int notes = sizeof(StartMusic);
  int wholenote = (secends * beat) / tempo;
  int divider = 0;
  int noteDuration = 0;

  for (int thisStartMusic = 0; thisStartMusic < notes * 2; thisStartMusic = thisStartMusic + 2) 
  {
    // calculates the duration of each note
    divider = pgm_read_word_near(StartMusic+thisStartMusic + 1);
    if (divider > 0) 
    {
      // regular note, just proceed
      noteDuration = (wholenote) / divider;
    } else 
    if (divider < 0) 
    {
      // dotted notes are represented with negative durations!!
      noteDuration = (wholenote) / abs(divider);
      noteDuration *= 1.5; // increases the duration in half for dotted notes
    }

    // we only play the note for 90% of the duration, leaving 10% as a pause
    tone(buzzer, pgm_read_word_near(StartMusic+thisStartMusic ), noteDuration * 0.9);

    // Wait for the specief duration before playing the next note.
    delay(noteDuration);

    // stop the waveform generation before the next note.
    noTone(buzzer);
  }
}



void loop() 
{

  gameSequence[gameIndex] = random(0, 4);
  gameIndex++;

  // no need to repeat the StartMusic.
  for(int i = 0; i<4; i++) 
  {
    digitalWrite(ledPins[i], HIGH);
    delay(500);
  }
}