export interface Controls {
  up: boolean,
  right: boolean,
  down: boolean,
  left: boolean,
  spaceCount: number,
}

export let current = {
  up: false,
  right: false,
  down: false,
  left: false,
  spaceCount: 0,
}

document.addEventListener('keydown', event => {
  current = update(current, event.key, true)
})

document.addEventListener('keyup', event => {
  current = update(current, event.key, false)
})

function update(current: Controls, key: string, isDown: boolean): Controls {
  if (key === 'ArrowUp')
    return { ...current, up: isDown }
  else if (key === 'ArrowRight')
    return { ...current, right: isDown }
  else if (key === 'ArrowDown')
    return { ...current, down: isDown }
  else if (key === 'ArrowLeft')
    return { ...current, left: isDown }
  else if (key === ' ' && !isDown)
    return { ...current, spaceCount: current.spaceCount + 1 }
  else
    return current
}