// "Click On Jazz" by John Clavin -- Sept 2015

var envelope;
var guit;
var clear;
var playJazz;
var melody_1;
var melody_2;
var melodyIndex;

var noteArray = [53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
		65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75,
		76, 77, 78, 79,	80, 81, 82, 83, 84, 85, 86];
					
function setup() {
  frameRate(30);
  var coj_canvas = createCanvas(800, 400);
  coj_canvas.parent('coj_container');
  coj_canvas.mousePressed(mouseXPressed);
  background(240,238,220);
  clear = false;
  playJazz = false;
  melody_1 = new melody(10);
  melody_2 = new melody(22);
  guit = new jcOsc();
  // text( "test 3", width - 100, 30);
}

function draw() {
  if(clear) {
    background(240,238,220);
    clear = false;
  }

  if (frameCount % 4 == 3) {
    if(playJazz) {
      if(mouseY >= height/2) {
        melodyIndex = melody_1.compose();
      } else {
        melodyIndex = melody_2.compose();
      }
      guit.jamOn(noteArray[melodyIndex]);
      guit.display();
    }
  }
}

function mouseXPressed() {
  clear = true;
  playJazz = true;
}

function mouseReleased() {
  playJazz = false;
  return false;
}

function jcOsc() {
  this.osc1 = new p5.Oscillator();
  this.osc2 = new p5.Oscillator();
  this.osc1.setType( 'sine' );
  this.osc2.setType( 'square' );
  this.osc1.amp(0.0);
  this.osc2.amp(0.0);
  this.envelope1 = new p5.Env(0.008, 0.20, 0.10, 0.12, 0.80, 0.00);
  this.envelope2 = new p5.Env(0.008, 0.12, 0.10, 0.06, 0.80, 0.00);
  // this.reverb = new p5.Reverb();
  this.osc1.start();
  this.osc2.start();
}

jcOsc.prototype.jamOn = function(xnote) {
  this.note = xnote;
  this.freqValue1 = midiToFreq(this.note);
  this.freqValue2 = midiToFreq(this.note - 12);
  this.osc1.freq(this.freqValue1);
  this.osc2.freq(this.freqValue2);
  // this.reverb.process(this.osc1, 2);
  this.envelope1.play(this.osc1);
  this.envelope2.play(this.osc2);	
}

jcOsc.prototype.display = function() {
  this.dir = 180 + random(-26, 26);
  this.notePosX = mouseX + random(-32, 32);
  this.notePosY = mouseY + random(-32, 32);
  fill(0);
  push();
  translate(this.notePosX, this.notePosY);
  rotate(radians(this.dir));
  ellipse(0, 0, 12, 8);
  line(-6, 0, -6, 20);
  line(-6, 20, -14, 16);
  pop();	
}

function melody(noteCenterIndex) {
  this.noteCenter = noteCenterIndex;
  this.note2Play;
  this.johnClavin;
  this.previousNote = this.noteCenter + round(random(-10, 10));
}
 
melody.prototype.compose = function() {
  if(this.previousNote < this.noteCenter) {
    this.note2Play = this.previousNote + round(random(1, 10));
  } else {
    this.note2Play = this.previousNote - round(random(1, 10));
  }
  this.previousNote = this.note2Play;
  this.johnClavin = 89200;
  return this.note2Play;
}