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const int LT = 1;
const int LI = 2;
const int LM = 3;
const int LR = 4;
const int RI = 5;
const int RM = 6;
const int RRB = 7;
const int RRS = 8;
const int RPB = 9;
const int RPS = 10;
const int AIR = 13;
const int wait = 500;
const int fingeringMatrix [] [10] =
{
  //C, Thumb to RPS
  {1, 1, 1, 1, 1, 1, 1, 1, 1, 1},//72 = C5 (one octave aboute middle C)
  {1, 1, 1, 1, 1, 1, 1, 1, 1, 0},//note: Middle C is 60
  {1, 1, 1, 1, 1, 1, 1, 1, 0, 0},
  {1, 1, 1, 1, 1, 1, 1, 0, 0, 0},
  {1, 1, 1, 1, 1, 1, 0, 0, 0, 0},
  {1, 1, 1, 1, 1, 0, 0, 0, 0, 0},
  {1, 1, 1, 1, 0, 1, 1, 1, 1, 1},
  {1, 1, 1, 1, 0, 0, 0, 0, 0, 0},
  {1, 1, 1, 0, 1, 1, 1, 0, 0, 0},
  {1, 1, 1, 0, 0, 0, 0, 0, 0, 0},
  {1, 1, 0, 1, 1, 0, 0, 0, 0, 0},
  {1, 1, 0, 0, 0, 0, 0, 0, 0, 0},
  {1, 0, 1, 0, 0, 0, 0, 0, 0, 0},//C6?
  {1, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  //NO THUMB NOW!!!!!!!
  {0, 0, 1, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 1, 1, 1, 1, 1, 1, 0, 0},
  {0, 1, 1, 1, 1, 1, 0, 0, 0, 0},
  {0, 1, 1, 1, 1, 0, 0, 0, 0, 0},
  {0, 1, 1, 1, 0, 1, 0, 0, 1, 1},
  {0, 1, 1, 1, 0, 0, 0, 0, 0, 0},
  {0, 1, 1, 0, 1, 0, 0, 0, 0, 0},
  {0, 1, 1, 0, 0, 0, 0, 0, 0, 0},
  {0, 1, 1, 0, 1, 1, 1, 1, 0, 0},//94
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}//OFF ROW
};
// MIDI data: https://learn.sparkfun.com/tutorials/midi-tutorial/all
byte incomingByte;
byte note;
byte velocity;
int action; //0=NONE; 1=NOTE ON; 2= NOTE OFF 3= OTHER, -1 = NOTE ON VELOCITY, -2 = NOTE OFF VELOCITY

void setup()
{
  Serial.begin(38400); //38400 debug, 31250 real (matches MIDI)
  //set up the pins
  for (int i = 1; i <= 10; i++)
  {
    pinMode(i, OUTPUT);
    digitalWrite(i, LOW);
  }
  pinMode(AIR, OUTPUT);
  //set up vars
  action = 0;
  note = 0;
  velocity = 0;
}

void loop() {
  if (Serial.available() > 0) // if theres data
  {
    incomingByte = Serial.read();//get data
    /*long asdf;
      asdf = Serial.parseInt();
      incomingByte = LTB(asdf);
      Serial.println(asdf);
      Serial.println(action);
      Serial.println(incomingByte);*/
    if (159 >= incomingByte && incomingByte >= 144) //NOTE ON status
    {
      action = 1;
    }
    else if (143 >= incomingByte && incomingByte >= 128) //NOTE OFF status
    {
      action = 2;
    }
    else if (incomingByte >= 128) //some other status byte
    {
      action = 3;
    }
    else if (incomingByte < 128) //data byte
    {
      if (action == 1)
      {
        note = incomingByte;
        action = -1;
      }
      else if (action == 2)
      {
        note = incomingByte;
        action = -2;
      }
      else if (action == -1)
      {
        velocity = incomingByte;
        playNote(note, velocity);
        action = 1;
      }
      else if (action == -2)
      {
        velocity = incomingByte;
        playNote(note, 0);
        action = 2;
      }
    }
  }

}

void playNote(byte n, byte v)
{
  if(note <72 || note >94)
  {
    return;
  }
  if (v == 0) //if OFF
  {
    note = 95;//OFF note
  }
 
  if (note >= 72 && note <= 95) //WHEN ON
  {
    note -= 72;
    for (int i = 0; i < 10; i++)
    {
      digitalWrite(i + 2, fingeringMatrix[note][i]);
    }
  }
  if(v==0)
  {
    digitalWrite(AIR, LOW);
  }
  else
  {
    delay(30);
    digitalWrite(AIR, HIGH);
  }
  return;
}

byte LTB(long e)
{
  byte ans = 0;
  int ansArr[8];
  for (int i = 0; i < 8; i++)
  {
    ansArr[i] = (e % 2);
    e /= 2;
  }
  for (int i = 7; i >= 0; i--)
  {
    ans += ansArr[i];
    if (i != 0)
    {
      ans *= 2;
    }
  }
  return ans;
}