'use strict'

    const PI2 = Math.PI * 2
let random = (min, max) => Math.random() * (max - min + 1) + min | 0

class Merica {
  constructor() {
    this.resize()

    this.fireworks = []
    this.counter = 0

  }
  resize() {
    this.width = canvas.width = window.innerWidth
    let center = this.width / 2 | 0
    this.spawnA = center - center / 4 | 0
    this.spawnB = center + center / 4 | 0

    this.height = canvas.height = window.innerHeight
    this.spawnC = this.height * .1
    this.spawnD = this.height * .5

  }
  onClick(evt) {
    let x = evt.clientX || evt.touches && evt.touches[0].pageX
    let y = evt.clientY || evt.touches && evt.touches[0].pageY

    let count = random(3, 5)
    for (let i = 0; i < count; i++) this.fireworks.push(new Firework(
      random(this.spawnA, this.spawnB),
      this.height,
      x,
      y,
      random(300, 400),
      random(30, 100)))

    this.counter = -30

  }
  update() {
    ctx.globalCompositeOperation = 'hard-light'
    ctx.fillStyle = 'rgba(20,20,20,0.15)'
    ctx.fillRect(0, 0, this.width, this.height)

    ctx.globalCompositeOperation = 'lighter'
    for (let firework of this.fireworks) firework.update()

    if (++this.counter === 15) {
      this.fireworks.push(new Firework(
        random(this.spawnA, this.spawnB),
        this.height,
        random(0, this.width),
        random(this.spawnC, this.spawnD),
        random(300, 450),
        random(30, 110)))
      this.counter = 0
    }

    if (this.fireworks.length > 1000) this.fireworks = this.fireworks.filter((firework) => !firework.dead)

  }
}

class Firework {
  constructor(x, y, targetX, targetY, shade, offsprings) {
    this.dead = false
    this.offsprings = offsprings

    this.x = x
    this.y = y
    this.targetX = targetX
    this.targetY = targetY

    this.shade = shade
    this.history = []
  }
  update() {
    if (this.dead) return;

    let xDiff = this.targetX - this.x
    let yDiff = this.targetY - this.y
    if (Math.abs(xDiff) > 3 || Math.abs(yDiff) > 3) {
      this.x += xDiff / 20
      this.y += yDiff / 20

      this.history.push({
        x: this.x,
        y: this.y
      })

      if (this.history.length > 20) this.history.shift()

    } else {
      if (this.offsprings && !this.madeChilds) {

        let start = this.offsprings / 2;
        for (let i = 0; i < start; i++) {
          let targetX = this.x + this.offsprings * Math.cos(PI2 * i / start) | 0
          let targetY = this.y + this.offsprings * Math.sin(PI2 * i / start) | 0

          usa.fireworks.push(new Firework(this.x, this.y, targetX, targetY, this.shade, 0))

        }

      }
      this.madeChilds = true
      this.history.shift()
    }

    if (this.history.length === 0) this.dead = true
    else if (this.offsprings)
      for (let i = 0; this.history.length > i; i++) {
        let point = this.history[i]
        ctx.beginPath()
        ctx.fillStyle = 'hsl(' + this.shade + ',100%,' + i + '%)'
        ctx.arc(point.x, point.y, 1, 0, PI2, false)
        ctx.fill()
      }
    else {
      ctx.beginPath()
      ctx.fillStyle = 'hsl(' + this.shade + ',100%,50%)'
      ctx.arc(this.x, this.y, 1, 0, PI2, false)
      ctx.fill()
    }

  }
}

let canvas = document.getElementById('usa')
let ctx = canvas.getContext('2d')

let usa = new Merica
window.onresize = () => usa.resize()
document.onclick = (evt) => usa.onClick(evt)
document.ontouchstart = (evt) => usa.onClick(evt)

;
(function update() {
  requestAnimationFrame(update)
  usa.update()

}())

script>
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