import javax.sound.midi.*;
import themidibus.*;

// Set var
int bpm = 100;
String file;
PFont font;
Sequencer sequencer;
MidiBus myBus; // The MidiBus

// setup
void setup() {
  size(500, 200);
  smooth();
  background(0);
  
  // load font and set as default
  font = loadFont("HelveticaNeue-Bold-40.vlw");
  textFont(font);
  textSize(16);
  fill(200);
  text ("Press keys between 1 and 9 to generate midi tones.", 20,20, width, 200);
  
  // MIDI SEQUENCER
  try {
    // Load and open default sequencer
    sequencer = MidiSystem.getSequencer();
    
    // Open Midi file
    file = selectInput();
    if (file == null) {
      System.out.println("No file was selected ...");
    } else {
      System.out.println("Selected file: " + file);
      textFont(font);
      textSize(16);
      fill(200);
      text ("Current Midi-File:\n" + file, 20,60, width, 200);
    }
    
    File myMidiFile = new File(file);
    
    // open sequencer
    if (sequencer == null) {
    } else {
      sequencer.open();
    }
    
    // Load selected midi file
    Sequence mySeq = MidiSystem.getSequence(myMidiFile);
    
    // Allocate sequence to sequencer
    sequencer.setSequence(mySeq);
    sequencer.setTempoInBPM(bpm);
  } catch (Exception e) {
    System.out.println ("Error: " + e.toString());
  }
  
  // MIDI SYNTHESIZER
  // initialize midibus
  myBus = new MidiBus(this,0,1);
}

void keyPressed() {
  // KEY TO PLAY A MIDI FILE
  if (key == 'p') {
   if (sequencer.isRunning()) {
     sequencer.stop();
     textFont(font);
     textSize(16);
     fill(200);
     background(0);
     text ("Press keys between 1 and 9 to generate midi tones.", 20,20, width, 200);
     text ("Current Midi-File:\n" + file, 20,60, width, 200);
   } else {
     sequencer.start();
     background(0);
     textFont(font);
     textSize(16);
     fill(200);
     text ("Press keys between 1 and 9 to generate midi tones.", 20,20, width, 200);
     text ("Playing:\n" + file, 20,60, width, 200);
   }
 }

  // KEYS TO PRODUCE MIDI SOUND
  if (key == '1') { 
    // (channel, pitch, velocity)
    myBus.sendNoteOn(0, 64, 100); // Send a Midi
  } else if (key == '2'){
    myBus.sendNoteOn(1, 66, 100); // Send a Midi
  } else if (key == '3'){
    myBus.sendNoteOn(2, 68, 100); // Send a Midi
  } else if (key == '4'){
    myBus.sendNoteOn(3, 70, 100); // aSend a Midi
  } else if (key == '5'){
    myBus.sendNoteOn(4, 72, 100); // Send a Midi
  } else if (key == '6'){
    myBus.sendNoteOn(5, 74, 100); // Send a Midi
  } else if (key == '7'){
    myBus.sendNoteOn(6, 76, 200); // Send a Midi
  } else if (key == '8'){
    myBus.sendNoteOn(7, 78, 200); // Send a Midi
  } else if (key == '9'){
    myBus.sendNoteOn(8, 80, 200); // Send a Midi
  }
}

void draw() {
}

void stop() {
  sequencer.stop();
  super.stop();
}