const isIphone = !! (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))
const isIpad = !! (navigator.userAgent.match(/iPad/i))
const isAndroid = !! (navigator.userAgent.match(/Android/i))
const isMobile = isIphone || isIpad || isAndroid
const isDesktop = ! isMobile

document.body.classList.add(isDesktop ? 'desktop' : 'mobile')

function randint(n){ return (Math.random()*n)|0 }
function randrange(a,b){ return (Math.random()*(b-a)+a)|0 }
function choice(a){ return a[randint(a.length)] }

export {
  isIphone, isIpad, isAndroid, isMobile, isDesktop,
  randint, randrange, choice,
}