let max_particles    = 1200;
let particles        = [];
let frequency        = 20;
let init_num         = max_particles;
let max_time         = frequency*max_particles;
let time_to_recreate = false;
const data           = createCanvas()
let tela             = data[0];
let canvas           = data[1];

// Enable repopolate
setTimeout(function(){
  time_to_recreate = true;
}.bind(this), max_time)

// Popolate particles
popolate(max_particles);

class FishEgg{
  constructor(canvas){
    const random = Math.random()
    this.progress = 0;
    this.canvas = canvas;
    // Set position
    this.x = ($(window).width()/2)  + (Math.random()*300 - Math.random()*300)
    this.y = ($(window).height()/2) + (Math.random()*$(window).height()/4 - Math.random()*$(window).height()/4)
    // Get viewport size
    this.w = $(window).width()
    this.h = $(window).height()

    // Dimension
    this.radius = 12 + Math.random()*6
    // Color
    this.color  = "rgba(255,255,255,1)"
    // Setting
    this.fish_egg = {
      offset1: Math.random() > 0.5 ? 0.5 + Math.random()*3 :  0.5 + Math.random()*-3,
      offset2: Math.random() > 0.5 ? 0.5 + Math.random()*3 :  0.5 + Math.random()*-3,
      offset3: Math.random() > 0.5 ? 0.5 + Math.random()*3 :  0.5 + Math.random()*-3,
      radius1: 0.5 + Math.random()*5,
      radius2: 0.5 + Math.random()*5,
      radius3: 0.5 + Math.random()*5
    }
    this.variantx1 = Math.random()*100
    this.variantx2 = Math.random()*100
    this.varianty1 = Math.random()*100
    this.varianty2 = Math.random()*100
  }

  createCircle(x,y,r,c){
    this.canvas.beginPath();
    this.canvas.fillStyle = c;
    this.canvas.arc(x, y, r, 0, Math.PI*2, false);
    this.canvas.fill();
    this.canvas.closePath();
  }

  createEyes(){
    this.createCircle(this.x+this.fish_egg.offset2, this.y+this.fish_egg.offset2, this.fish_egg.radius2 + 4, "rgba(241, 242, 244, 0.06)")
    this.createCircle(this.x+this.fish_egg.offset3, this.y+this.fish_egg.offset3, this.fish_egg.radius3 + 2, "rgba(255, 204, 67, 0.08)")
    this.createCircle(this.x+(Math.random(this.progress/350)*this.fish_egg.offset1), this.y+(Math.random(this.progress/350)*this.fish_egg.offset1), this.fish_egg.radius1, "rgba(152, 19, 4, 0.19)")
  }

  render(){
    // Create inside parts
    this.createEyes()

    this.canvas.beginPath();
    let c   = '130, 151, 180';
    let rad = this.canvas.createRadialGradient(this.x, this.y, this.radius, this.x, this.y, 1);
    rad.addColorStop(0, 'rgba('+c+',0.09)');
    rad.addColorStop(0.9, 'rgba('+c+',0)');
    this.canvas.lineWidth = Math.random()*2.2;
    this.canvas.fillStyle = rad;
    this.canvas.arc(this.x, this.y, this.radius, 0, Math.PI*2, false);
    this.canvas.fill();
    this.canvas.strokeStyle = "rgba(255, 255, 217, 0.05)";
    this.canvas.stroke();
    this.canvas.closePath();
  }

  move(){
    this.x += (Math.sin(this.progress/this.variantx1)*Math.cos(this.progress/this.variantx2))/8;
    this.y += (Math.sin(this.progress/this.varianty1)*Math.cos(this.progress/this.varianty2))/8;



    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y < 0 || this.y > this.h - this.radius){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

class FishLarva{
  constructor(canvas, progress){
    const random = Math.random()
    this.progress = 0;
    this.canvas = canvas;
    this.speed = 0.5 + random*1.3

    this.x = ($(window).width()/2)  + (Math.random()*200 - Math.random()*200)
    this.y = ($(window).height()/2) + (Math.random()*200 - Math.random()*200)

    this.s = 0.8 + Math.random() * 0.6;
    this.a = 0

    this.w = $(window).width()
    this.h = $(window).height()
    this.radius = random*1.3
    this.color  = "#f69a34"

    this.variantx1 = Math.random()*1000
    this.variantx2 = Math.random()*1000
    this.varianty1 = Math.random()*1000
    this.varianty2 = Math.random()*1000
  }

  render(){
    this.canvas.beginPath();
    this.canvas.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
    this.canvas.lineWidth = 2;
    this.canvas.fillStyle = this.color;
    this.canvas.fill();
    this.canvas.closePath();
  }

  move(){
    // this.x += (Math.sin(this.progress/this.variantx1)*Math.cos(this.progress/this.variantx2))/this.speed;
    // this.y += (Math.sin(this.progress/this.varianty1)*Math.cos(this.progress/this.varianty2))/this.speed;
    this.x += Math.cos(this.a) * this.s;
    this.y += Math.sin(this.a) * this.s;
    this.a += Math.random() * 0.8 - 0.4;
    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y < 0 || this.y > this.h - this.radius){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}


class FishLarvaEgg{
  constructor(canvas, progress){
    const random = Math.random()
    this.progress = 0;
    this.canvas = canvas;
    this.speed = 0.5 + random*0.2

    this.x = ($(window).width()/2)  + (Math.random()*200 - Math.random()*200)
    this.y = ($(window).height()/2) + (Math.random()*200 - Math.random()*200)

    this.s = Math.random() * 1;
    this.a = 0

    this.w = $(window).width()
    this.h = $(window).height()
    this.radius = random*0.8
    this.color  = random > 0.8 ? "#82a0c4" : "#2E4765"

    this.variantx1 = Math.random()*100
    this.variantx2 = Math.random()*100
    this.varianty1 = Math.random()*100
    this.varianty2 = Math.random()*100
  }

  render(){
    this.canvas.beginPath();
    this.canvas.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
    this.canvas.lineWidth = 2;
    this.canvas.fillStyle = this.color;
    this.canvas.fill();
    this.canvas.closePath();
  }

  move(){
    this.x += Math.cos(this.a) * this.s;
    this.y += Math.sin(this.a) * this.s;
    this.a += Math.random() * 0.8 - 0.4;

    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y < 0 || this.y > this.h - this.radius){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

class Paramecium{
  constructor(canvas){
    const random = Math.random()
    this.progress = 0;
    this.canvas = canvas;
    // Set position
    this.x = ($(window).width()/2)  + (Math.random()*300 - Math.random()*300)
    this.y = ($(window).height()/2) + (Math.random()*$(window).height()/4 - Math.random()*$(window).height()/4)
    // Get viewport size
    this.w = $(window).width()
    this.h = $(window).height()
    this.rotation = (random*180)*Math.PI/180
    // Dimension
    this.radius = 12 + Math.random()*6
    // Color
    this.color  = "rgba(255,255,255,1)"
    // Setting
    this.variantx1 = Math.random()*100
    this.variantx2 = Math.random()*100
    this.varianty1 = Math.random()*100
    this.varianty2 = Math.random()*100
  }

  createOval(x, y, w, h) {
    var kappa = .5522848,
        ox = (w / 2) * kappa, // control point offset horizontal
        oy = (h / 2) * kappa, // control point offset vertical
        xe = x + w,           // x-end
        ye = y + h,           // y-end
        xm = x + w / 2,       // x-middle
        ym = y + h / 2;       // y-middle

    this.canvas.save();

    this.canvas.translate(this.w/2, this.h/2);

    // Rotate 1 degree
    this.canvas.rotate(this.rotation);

    // Move registration point back to the top left corner of canvas
    this.canvas.translate(-this.w/2, -this.h/2);

    this.canvas.beginPath();
    this.canvas.moveTo(x, ym);
    this.canvas.quadraticCurveTo(x,y,xm,y);
    this.canvas.quadraticCurveTo(xe,y,xe,ym);
    this.canvas.quadraticCurveTo(xe,ye,xm,ye);
    this.canvas.quadraticCurveTo(x,ye,x,ym);

    this.canvas.strokeStyle = 1;
    this.canvas.fillStyle = "rgba(255,255,255,0.01)";
    this.canvas.fill();
    this.canvas.stroke();
    this.canvas.restore();
  }

  render(){
    // Create inside parts
    this.createOval(this.x, this.y, 12, 4)
  }

  move(){
    this.x += (Math.sin(this.progress/this.variantx1)*Math.cos(this.progress/this.variantx2))/4;
    this.y += (Math.sin(this.progress/this.varianty1)*Math.cos(this.progress/this.varianty2))/4;

    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y < 0 || this.y > this.h - this.radius){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

/*
 * Function to create canvas
 */
function createCanvas(){
  let tela = document.createElement('canvas');
      tela.width = $(window).width();
      tela.height = $(window).height();
      $("body").append(tela);
  let canvas = tela.getContext('2d');
  return [tela, canvas]
}

/*
 * Function to clear layer canvas
 * @num:number number of particles
 */
function popolate(num){
  for (var i = 0; i < num; i++) {
    setTimeout(
      function(x){
        return function(){
          let random = Math.random()
          // ------------------------------------
          // Set type of planktom
          let type = new FishLarva(canvas)
          if(!time_to_recreate){
            if(random > .97) type = new FishEgg(canvas);
            if(random < .1 && random > 0) type  = new Paramecium(canvas)
          }
          if(random > .1 && random < .8) type  = new FishLarvaEgg(canvas)

          // if(random < .1) this.type  = "bryozoan"
          // ------------------------------------
          // Add particle
          particles.push(type)
        };
      }(i)
      ,frequency*i);
  }
  return particles.length
}

/*
 * Function to clear layer canvas
 */
function clear(){
  let grd = canvas.createRadialGradient(tela.width/2, tela.height/2, 0, tela.width/2, tela.height/2, tela.width);
      grd.addColorStop(0,"rgba(25,25,54,0.12)");
      grd.addColorStop(1,"rgba(0,0,20,0.01)");
  // Fill with gradient
  canvas.fillStyle=grd;
  canvas.fillRect(0, 0, tela.width, tela.height);
}

/*
 * Function to update particles in canvas
 */
function update(){
  clear();
  particles = particles.filter(function(p) { return p.move() })
  // Recreate particles
  if(time_to_recreate){
    if(particles.length < init_num){ popolate(1) }
  }
  requestAnimationFrame(update.bind(this))
}
// Update canvas
update()