'use strict'

class Keyboard {
  constructor (responder) {
    this.responder = responder
    document.addEventListener('keyup', this.onKey.bind(this))
    this.keyMap = new Map()
    this.keyMap.set(37, Input.left) // left arrow
    this.keyMap.set(39, Input.right) // right arrow
    this.keyMap.set(38, Input.center) // up arrow
    this.keyMap.set(40, Input.back) // down arrow
  }

  onKey (event) {
    if (this.keyMap.has(event.keyCode)) {
      this.responder(this.keyMap.get(event.keyCode))
      event.preventDefault()
    }
  }
}