// MONOPHONIC CV to MIDI adaptor for Monophonic synthisizers.

void xprintf(const char *format, ...);    // programmer misses printf, so sue me.

int gateLevel = 0;
int gateOld = 0;
int noteNum = 0;
int noteOld = 0;
int midCh = 1;

class fakeMIDI {
  public:
    void begin(unsigned char);
    void sendNoteOn(unsigned char, unsigned char, unsigned char);
    void sendNoteOff(unsigned char, unsigned char, unsigned char);

  private:

};

void fakeMIDI::begin(unsigned char x)
{
  xprintf("begin MIDI object %d\n", x);
}

void fakeMIDI::sendNoteOn(unsigned char theNote, unsigned char theIDK, unsigned char theChannel)
{
  xprintf("note %2d ON  w/ IDK %3d.\n", theNote, theIDK);
}

void fakeMIDI::sendNoteOff(unsigned char theNote, unsigned char theIDK, unsigned char theChannel)
{
  xprintf("note %2d OFF w/ IDK %3d.\n", theNote, theIDK);
}

fakeMIDI MIDI;

//

void setup()
{
  mySetup(115200);
  xprintf("\nhello world.\n"); 

  MIDI.begin(222);

  pinMode(A1, INPUT_PULLUP);
}

void loop() {

  int pitchPin = analogRead(A0);  // read analog pins

  int gatePin = !digitalRead(A1);

  float voltage = pitchPin * (5.0 / 1023.0); // get voltage for pitch cv input
  int noteNum = (voltage / 0.08) + 24;

  noteNum = map(pitchPin, 0, 1024, 48, 62);   // remove. just making the steps big

  gateLevel = gatePin;    // digital input now



  //  checks for various changed conditions and send midi command as appropriate.
  

  if (gateLevel == 1) {
    if (gateLevel != gateOld) {
      MIDI.sendNoteOn((noteNum), 127, (midCh));
    }
    
    if (noteNum != noteOld) {
      MIDI.sendNoteOff((noteOld), 0, (midCh));
      delay(29);
      MIDI.sendNoteOn((noteNum), 127, (midCh));

      noteOld = noteNum;   // currently playing note
    }
  }

  if (gateLevel != gateOld) {
  	if (!gateLevel) {
    	MIDI.sendNoteOff((noteNum), 0, (midCh));    // send noteOff command for noteNum and NoteOld

      if (noteNum != noteOld) {
        MIDI.sendNoteOff((noteOld), 0, (midCh));
        xprintf("                yes?\n");
        noteOld = noteNum;
      }
	  }
  }

  gateOld = gateLevel;

  delay(50);
}


// 

// programmer misses printf...

void xprintf(const char *format, ...)
{
  char buffer[256];
  va_list args;
  va_start(args, format);
  vsprintf(buffer, format, args);
  va_end(args);
  Serial.print(buffer);
}

// programmer forgets day of week, version

void mySetup(unsigned long bandRate)
{
  Serial.begin(bandRate);
  
  char s[] = __FILE__;
  byte b = sizeof(s);
  while ( (b > 0) && (s[b] != 47)) b--;
  char *u = s + b + 1;
 
  xprintf("\nHEllo WOrld!\n");
  xprintf("%s  %s\n\n", __DATE__, u);

  xprintf("!\n");
}