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var split = require('browser-split')

var ClassList = require('class-list')

var w = typeof window === 'undefined' ? require('html-element') : window

var document = w.document

var Text = w.Text

function context () {

var cleanupFuncs = []

function h() {

var args = [].slice.call(arguments), e = null

function item (l) {

var r

function parseClass (string) {

// Our minimal parser doesn’t understand escaping CSS special

// characters like `#`. Don’t use them. More reading:

// https://mathiasbynens.be/notes/css-escapes .

var m = split(string, /([\.#]?[^\s#.]+)/)

if(/^\.|#/.test(m[1]))

e = document.createElement('div')

forEach(m, function (v) {

var s = v.substring(1,v.length)

if(!v) return

if(!e)

e = document.createElement(v)

else if (v[0] === '.')

ClassList(e).add(s)

else if (v[0] === '#')

e.setAttribute('id', s)

})

}

if(l == null)

;

else if('string' === typeof l) {

if(!e)

parseClass(l)

else

e.appendChild(r = document.createTextNode(l))

}

else if('number' === typeof l

|| 'boolean' === typeof l

|| l instanceof Date

|| l instanceof RegExp ) {

e.appendChild(r = document.createTextNode(l.toString()))

}

//there might be a better way to handle this...

else if (isArray(l))

forEach(l, item)

else if(isNode(l))

e.appendChild(r = l)

else if(l instanceof Text)

e.appendChild(r = l)

else if ('object' === typeof l) {

for (var k in l) {

if('function' === typeof l[k]) {

if(/^on\w+/.test(k)) {

(function (k, l) { // capture k, l in the closure

if (e.addEventListener){

e.addEventListener(k.substring(2), l[k], false)

cleanupFuncs.push(function(){

e.removeEventListener(k.substring(2), l[k], false)

})

}else{

e.attachEvent(k, l[k])

cleanupFuncs.push(function(){

e.detachEvent(k, l[k])

})

}

})(k, l)

} else {

// observable

e[k] = l[k]()

cleanupFuncs.push(l[k](function (v) {

e[k] = v

}))

}

}

else if(k === 'style') {

if('string' === typeof l[k]) {

e.style.cssText = l[k]

}else{

for (var s in l[k]) (function(s, v) {

if('function' === typeof v) {

// observable

e.style.setProperty(s, v())

cleanupFuncs.push(v(function (val) {

e.style.setProperty(s, val)

}))

} else

var match = l[k][s].match(/(.*)\W+!important\W*$/);

if (match) {

e.style.setProperty(s, match[1], 'important')

} else {

e.style.setProperty(s, l[k][s])

}

})(s, l[k][s])

}

} else if(k === 'attrs') {

for (var v in l[k]) {

e.setAttribute(v, l[k][v])

}

}

else if (k.substr(0, 5) === "data-") {

e.setAttribute(k, l[k])

} else {

e[k] = l[k]

}

}

} else if ('function' === typeof l) {

//assume it's an observable!

var v = l()

e.appendChild(r = isNode(v) ? v : document.createTextNode(v))

cleanupFuncs.push(l(function (v) {

if(isNode(v) && r.parentElement)

r.parentElement.replaceChild(v, r), r = v

else

r.textContent = v

}))

}

return r

}

while(args.length)

item(args.shift())

return e

}

h.cleanup = function () {

for (var i = 0; i < cleanupFuncs.length; i++){

cleanupFuncs[i]()

}

cleanupFuncs.length = 0

}

return h

}

var h = module.exports = context()

h.context = context

function isNode (el) {

return el && el.nodeName && el.nodeType

}

function forEach (arr, fn) {

if (arr.forEach) return arr.forEach(fn)

for (var i = 0; i < arr.length; i++) fn(arr[i], i)

}

function isArray (arr) {

return Object.prototype.toString.call(arr) == '[object Array]'

}