import promidi.*;
import processing.xml.*;

int number = 15;
int waveform = 0;

String filename;

promidi.Sequencer sequencer;
promidi.Track track;

XMLElement xml;

void setup() {
  size(400, 150);
  background(0, 204, 255);
  textFont(loadFont("Calibri-Bold-18.vlw"));
  fill(0);
  text("Click to start.", 12, 30);
}

void mousePressed() {
  String wvf;
  if (waveform == 0) {
    wvf = "Sine";
  } else if (waveform == 1) {
    wvf = "Saw";
  } else {
    wvf = "Piano";
    number = (number + 1) % 17;
  }
  filename = (number < 10 ? "0" : "") + number + "-" + wvf + "_0.wav-081003-1337.out";
  waveform = (waveform + 1) % 3;
  
  filename = "04.xml";
  playXML(filename);
}

void playXML(String xmlFile) {
  println("Playing " + xmlFile);
  background(0, 204, 255);
  textFont(loadFont("Calibri-Bold-18.vlw"));
  fill(0);
  text("Playing back XML file...", 12, 30);
  fill(0, 80);
  text(filename, 12, 60);
  
  // For MIDI playback
  sequencer = new promidi.Sequencer();
  MidiIO midiIO = MidiIO.getInstance();
  MidiOut midiOut = midiIO.getMidiOut(1,1);
  if (waveform == 1) {
    midiOut.sendProgramChange(new ProgramChange(81));
  } else if (waveform == 0) {
    midiOut.sendProgramChange(new ProgramChange(78));
  } else {
    midiOut.sendProgramChange(new ProgramChange(0));
  }
  track = new promidi.Track("TrackOne", midiOut);
  
  // Read in the XML
  xml = new XMLElement(this, filename);
  String windowSize = xml.getChild("header/windowSize").getContent();
  String samplingRate = xml.getChild("header/samplingRate").getContent();
  //int windowTicks = Integer.parseInt(windowSize) / 250;
  int windowLength = round((1.0 / Float.parseFloat(samplingRate)) * (Integer.parseInt(windowSize) + 1.0) * 100);
  
  XMLElement[] notes = xml.getChildren("note");
  
  // Add the notes to the track
  String temp;
  int start;
  int end;
  int pitch;
  int len;
  for (int i = 0; i < notes.length; i++) {
    temp = notes[i].getChild("start").getContent();
    start = Integer.parseInt(temp) + 1;
    temp = notes[i].getChild("end").getContent();
    end = Integer.parseInt(temp) + 1;
    //len = (end - start) * windowLength;
    pitch = pitchToInt(notes[i].getChild("pitch").getContent());
    track.addEvent(new Note(pitch, 127, 0), start * windowLength);
    track.addEvent(new Note(pitch, 0, 0), end * windowLength);
  }
  
  // Prepare it for playback
  promidi.Song song = new Song("Song", 120);
  song.addTrack(track);
  sequencer.setSong(song);
  
  sequencer.start();
}

void draw() {
  
}

int pitchToInt(String pitch) {
  int toReturn = 9;
  char temp = pitch.charAt(0);
  switch (temp) {
    case 'c':
    case 'C': toReturn += 4; break;
    case 'd':
    case 'D': toReturn += 6; break;
    case 'e':
    case 'E': toReturn += 8; break;
    case 'f':
    case 'F': toReturn += 9; break;
    case 'g':
    case 'G': toReturn += 11; break;
    case 'a':
    case 'A': toReturn += 13; break;
    case 'b':
    case 'B': toReturn += 15; break;
  }
  temp = pitch.charAt(1);
  if (temp == '#') toReturn++;
  int octave = Integer.parseInt(pitch.substring(2, 3));
  toReturn += (octave+1) * 12;
  
  toReturn--;
  return toReturn;
}