var sketch = Sketch.create(),
    center = {
      x: sketch.width / 2,
      y: sketch.height / 2
    },
    orbs = [],    
    dt = 1,
    opt = {
      total: 0,
      count: 100,
      spacing: 2,
      speed: 65,
      scale: 1,
      jitterRadius: 0,
      jitterHue: 0,
      clearAlpha: 10,
      toggleOrbitals: true,
      orbitalAlpha: 100,
      toggleLight: true,      
      lightAlpha: 5,
      clear: function(){
        sketch.clearRect( 0, 0, sketch.width, sketch.height ),
        orbs.length = 0; 
      }
    };

var Orb = function( x, y ){
  var dx = ( x / opt.scale ) - ( center.x / opt.scale ),
	    dy = ( y / opt.scale ) - ( center.y / opt.scale );
  this.angle = atan2( dy, dx );
  this.lastAngle = this.angle;
	this.radius = sqrt( dx * dx + dy * dy );
  console.log(this.radius);
  this.size = ( this.radius / 300 ) + 1;
	this.speed = ( random( 1, 10 ) / 300000 ) * ( this.radius ) + 0.015;
};

Orb.prototype.update = function(){  
  this.lastAngle = this.angle;
  this.angle += this.speed * ( opt.speed / 50 ) * dt;
  this.x = this.radius * cos( this.angle );
  this.y = this.radius * sin( this.angle );
};

Orb.prototype.render = function(){
  if(opt.toggleOrbitals){
    var radius = ( opt.jitterRadius === 0 ) ? this.radius : this.radius + random( -opt.jitterRadius, opt.jitterRadius );
   radius = ( opt.jitterRadius != 0 && radius < 0 ) ? 0.001 : radius;
    sketch.strokeStyle = 'hsla( ' + ( ( this.angle + 90 ) / ( PI / 180 ) + random( -opt.jitterHue, opt.jitterHue ) ) + ', 100%, 50%, ' + ( opt.orbitalAlpha / 100 ) + ' )';
    sketch.lineWidth = this.size;			
    sketch.beginPath();
    if(opt.speed >= 0){
      sketch.arc( 0, 0, radius, this.lastAngle, this.angle + 0.001, false );
    } else {
      sketch.arc( 0, 0, radius, this.angle, this.lastAngle + 0.001, false );
    };
    sketch.stroke();
    sketch.closePath();
  };
  
  if(opt.toggleLight){
    sketch.lineWidth = .5;
    sketch.strokeStyle = 'hsla( ' + ( ( this.angle + 90 ) / ( PI / 180 ) + random( -opt.jitterHue, opt.jitterHue ) ) + ', 100%, 70%, ' + ( opt.lightAlpha / 100 ) + ' )';
    sketch.beginPath();
    sketch.moveTo( 0, 0 );
    sketch.lineTo( this.x, this.y );
    sketch.stroke();
  };
};

var createOrb = function( config ){
  var x = ( config && config.x ) ? config.x : sketch.mouse.x,
      y = ( config && config.y ) ? config.y : sketch.mouse.y;
  console.log("Create orb", `${x} et ${y}`);
	orbs.push( new Orb( x, y ) );
};

var turnOnMove = function(){
	sketch.mousemove = createOrb;	
};

var turnOffMove = function(){
	sketch.mousemove = null;	
};

sketch.mousedown = function(){
  createOrb();
  turnOnMove();
};

sketch.mouseup = turnOffMove;

sketch.resize = function(){
  center.x = sketch.width / 2;
  center.y = sketch.height / 2;
  sketch.lineCap = 'round';
};

sketch.setup = function(){  
  while( opt.count-- ){
    createOrb( {
      x: random( sketch.width / 2 - 300, sketch.width / 2 + 300 ), 
      y: random( sketch.height / 2 - 300, sketch.height / 2 + 300 ) 
    } );
  };
};

sketch.clear = function(){
  sketch.globalCompositeOperation = 'destination-out';
  sketch.fillStyle = 'rgba( 0, 0, 0 , ' + ( opt.clearAlpha / 100 ) + ' )';
	sketch.fillRect( 0, 0, sketch.width, sketch.height );
  sketch.globalCompositeOperation = 'lighter';
};

sketch.update = function(){
  dt = ( sketch.dt < 0.1 ) ? 0.1 : sketch.dt / 16;
  dt = ( dt > 5 ) ? 5 : dt;
  var i = orbs.length;
  opt.total = i;
  while( i-- ){ 
    orbs[i].update();
  }
};

sketch.draw = function(){
  sketch.save();
  sketch.translate( center.x, center.y );
  sketch.scale( opt.scale, opt.scale );
  var i = orbs.length;
	while( i-- ){	
    orbs[i].render();	
  }
  sketch.restore();
};

gui = new dat.GUI( { autoPlace: false } )
gui.add( opt, 'total' ).name( 'Total Orbitals' ).listen();
gui.add( opt, 'speed' ).min( -300 ).max( 300 ).step( 1 ).name( 'Speed' );
gui.add( opt, 'scale' ).min( 0.5 ).max( 5 ).step( 0.001 ).name( 'Scale' );
gui.add( opt, 'jitterRadius' ).min( 0 ).max( 5 ).step( 0.001 ).name( 'Radius Jitter' );
gui.add( opt, 'jitterHue' ).min( 0 ).max( 90 ).step( 1 ).name( 'Hue Jitter' );
gui.add( opt, 'clearAlpha' ).min( 0 ).max( 100 ).step( 1 ).name( 'Clear Alpha' );
gui.add( opt, 'toggleOrbitals' ).name( 'Toggle Orbitals' )
gui.add( opt, 'orbitalAlpha' ).min( 0 ).max( 100 ).step( 1 ).name( 'Orbital Alpha' );
gui.add( opt, 'toggleLight' ).name( 'Toggle Light' );
gui.add( opt, 'lightAlpha' ).min( 0 ).max( 100 ).step( 1 ).name( 'Light Alpha' );

gui.add( opt, 'clear' ).name( 'Clear' );
customContainer = document.getElementById( 'gui' );
customContainer.appendChild(gui.domElement);
  
document.onselectstart = function(){
  return false;
};