/*! ie11CustomProperties.js v2.7.2 | MIT License | https://git.io/fjXMN */
// c1.onElement helper
!(function() {
  'use strict'

  if (!Element.prototype.matches)
    Element.prototype.matches = Element.prototype.msMatchesSelector

  var w = window
  if (!w.c1) w.c1 = {}
  var listeners = [],
    root = document,
    Observer

  c1.onElement = function(selector, options /*, disconnectedCallback*/) {
    if (typeof options === 'function') {
      options = { parsed: options }
    }
    var listener = {
      selector: selector,
      immediate: options.immediate,
      //disconnectedCallback: disconnectedCallback,
      elements: new WeakMap()
    }

    if (options.parsed) {
      listener.parsed = function(el) {
        requestAnimationFrame(function() {
          options.parsed(el)
        })
      }
    }

    var els = root.querySelectorAll(listener.selector),
      i = 0,
      el
    while ((el = els[i++])) {
      listener.elements.set(el, true)
      listener.parsed && listener.parsed.call(el, el)
      listener.immediate && listener.immediate.call(el, el)
    }

    listeners.push(listener)
    if (!Observer) {
      Observer = new MutationObserver(checkMutations)
      Observer.observe(root, {
        childList: true,
        subtree: true
      })
    }
    checkListener(listener)
  }
  function checkListener(listener, target) {
    var i = 0,
      el,
      els = []
    target && target.matches(listener.selector) && els.push(target)
    if (loaded) {
      // ok? check inside node on innerHTML - only when loaded
      Array.prototype.push.apply(
        els,
        (target || root).querySelectorAll(listener.selector)
      )
    }
    while ((el = els[i++])) {
      if (listener.elements.has(el)) continue
      listener.elements.set(el, true)
      //listener.connectedCallback.call(el, el);
      listener.parsed && listener.parsed.call(el, el)
      listener.immediate && listener.immediate.call(el, el)
    }
  }
  function checkListeners(inside) {
    var i = 0,
      listener
    while ((listener = listeners[i++])) checkListener(listener, inside)
  }
  function checkMutations(mutations) {
    var j = 0,
      i,
      mutation,
      nodes,
      target
    while ((mutation = mutations[j++])) {
      ;(nodes = mutation.addedNodes), (i = 0)
      while ((target = nodes[i++]))
        target.nodeType === 1 && checkListeners(target)
    }
  }

  var loaded = false
  document.addEventListener('DOMContentLoaded', function() {
    loaded = true
  })

  // svg polyfills
  function copyProperty(prop, from, to) {
    var desc = Object.getOwnPropertyDescriptor(from, prop)
    Object.defineProperty(to, prop, desc)
  }
  if (!('classList' in Element.prototype)) {
    copyProperty('classList', HTMLElement.prototype, Element.prototype)
  }
  if (!('innerHTML' in Element.prototype)) {
    copyProperty('innerHTML', HTMLElement.prototype, Element.prototype)
  }
  if (!('sheet' in SVGStyleElement.prototype)) {
    Object.defineProperty(SVGStyleElement.prototype, 'sheet', {
      get: function() {
        var all = document.styleSheets
        for (var i = 0, sheet; (sheet = all[i++]); ) {
          if (sheet.ownerNode === this) return sheet
        }
      }
    })
  }
  // if ('children' in HTMLElement.prototype && !('children' in Element.prototype)) {
  // 	copyProperty('children', HTMLElement.prototype, Element.prototype);
  // }
  // if ('contains' in HTMLElement.prototype && !('contains' in Element.prototype)) {
  // 	copyProperty('contains', HTMLElement.prototype, Element.prototype);
  // }
  // if ('getElementsByClassName' in HTMLElement.prototype && !('getElementsByClassName' in Element.prototype)) {
  // 	copyProperty('getElementsByClassName', HTMLElement.prototype, Element.prototype);
  // }
})()

// main logic
!(function() {
  'use strict'
  var testEl = document.createElement('i')
  testEl.style.setProperty('--x', 'y')
  if (testEl.style.getPropertyValue('--x') === 'y' || !testEl.msMatchesSelector)
    return

  // cached regexps, better performance
  const regFindSetters = /([\s{;])(--([A-Za-z0-9-_]+\s*:[^;!}{]+)(!important)?)(?=\s*([;}]|$))/g
  const regFindGetters = /([{;]\s*)([A-Za-z0-9-_]+\s*:[^;}{]*var\([^!;}{]+)(!important)?(?=\s*([;}$]|$))/g
  const regRuleIEGetters = /-ieVar-([^:]+):/g
  const regRuleIESetters = /-ie-([^};]+)/g
  const regHasVar = /var\(/
  const regPseudos = /:(hover|active|focus|target|:before|:after)/

  c1.onElement('link[rel="stylesheet"]', {
    immediate: function(el) {
      fetchCss(el.href, function(css) {
        var newCss = rewriteCss(css)
        if (css === newCss) return
        newCss = relToAbs(el.href, newCss)
        el.disabled = true
        var style = document.createElement('style')
        el.parentNode.insertBefore(style, el)
        activateStyleElement(style, newCss)
      })
    }
  })
  c1.onElement('style', {
    immediate: function(el) {
      if (el.hasAttribute('ie-polyfilled')) return
      if (el.ieCP_elementSheet) return
      var css = el.innerHTML
      var newCss = rewriteCss(css)
      if (css === newCss) return
      activateStyleElement(el, newCss)
    }
  })
  c1.onElement('[ie-style]', {
    immediate: function(el) {
      var newCss = rewriteCss('{' + el.getAttribute('ie-style')).substr(1)
      el.style.cssText += ';' + newCss
      var found = parseRewrittenStyle(el.style)
      if (found.getters) addGetterElement(el, found.getters, '%styleAttr')
      if (found.setters) addSetterElement(el, found.setters)
    }
  })

  function relToAbs(base, css) {
    return css.replace(/url\(([^)]+)\)/g, function($0, $1) {
      $1 = $1.trim().replace(/(^['"]|['"]$)/g, '')
      if ($1.match(/^([a-z]+:|\/)/)) return $0
      base = base.replace(/\?.*/, '')
      return 'url(' + base + './../' + $1 + ')'
    })
  }

  // ie has a bug, where unknown properties at pseudo-selectors are computed at the element
  // #el::after { -content:'x'; } => getComputedStyle(el)['-content'] == 'x'
  // should we add something like -ieVar-pseudo_after-content:'x'?
  function rewriteCss(css) {
    /* uncomment if spec finished and needed by someone
  css = css.replace(/@property ([^{]+){([^}]+)}/, function($0, prop, body){
    prop = prop.trim();
    const declaration = {name:prop};
    body.split(';').forEach(function(pair){
      const x = pair.split(':');
      if (x[1]) declaration[ x[0].trim() ] = x[1];
    });
    declaration['inherits'] = declaration['inherits'].trim()==='true' ? true : false;
    declaration['initialValue'] = declaration['initial-value'];
    CSS.registerProperty(declaration)
    return '/*\n @property ... removed \n*'+'/';
  });
  */

    return css
      .replace(regFindSetters, function($0, $1, $2, $3, important) {
        return $1 + '-ie-' + (important ? '❗' : '') + $3
      })
      .replace(regFindGetters, function($0, $1, $2, important) {
        return $1 + '-ieVar-' + (important ? '❗' : '') + $2 + '; ' + $2 // keep the original, so chaining works "--x:var(--y)"
      })
  }

  // beta
  const styles_of_getter_properties = {}

  function parseRewrittenStyle(style) {
    // less memory then parameter cssText?

    // beta
    style['z-index'] // ie11 can access unknown properties in stylesheets only if accessed a dashed known property

    const cssText = style.cssText
    var matchesGetters = cssText.match(regRuleIEGetters),
      j,
      match
    if (matchesGetters) {
      var getters = [] // eg. [border,color]
      for (j = 0; (match = matchesGetters[j++]); ) {
        let propName = match.slice(7, -1)
        if (propName[0] === '❗') propName = propName.substr(1)
        getters.push(propName)

        // beta
        if (!styles_of_getter_properties[propName])
          styles_of_getter_properties[propName] = []
        styles_of_getter_properties[propName].push(style)
      }
    }
    var matchesSetters = cssText.match(regRuleIESetters)
    if (matchesSetters) {
      var setters = {} // eg. [--color:#fff, --padding:10px];
      for (j = 0; (match = matchesSetters[j++]); ) {
        let x = match.substr(4).split(':')
        let propName = x[0]
        let propValue = x[1]
        if (propName[0] === '❗') propName = propName.substr(1)
        setters[propName] = propValue
      }
    }
    return { getters: getters, setters: setters }
  }
  function activateStyleElement(style, css) {
    style.innerHTML = css
    style.setAttribute('ie-polyfilled', true)
    var rules = style.sheet.rules,
      i = 0,
      rule // cssRules = CSSRuleList, rules = MSCSSRuleList
    while ((rule = rules[i++])) {
      const found = parseRewrittenStyle(rule.style)
      if (found.getters) addGettersSelector(rule.selectorText, found.getters)
      if (found.setters) addSettersSelector(rule.selectorText, found.setters)

      // mediaQueries: redraw the hole document
      // better add events for each element?
      const media =
        rule.parentRule &&
        rule.parentRule.media &&
        rule.parentRule.media.mediaText
      if (media && (found.getters || found.setters)) {
        matchMedia(media).addListener(function() {
          drawTree(document.documentElement)
        })
      }
    }

    // beta
    redrawStyleSheets()
  }

  function addGettersSelector(selector, properties) {
    selectorAddPseudoListeners(selector)
    c1.onElement(unPseudo(selector), {
      immediate: function(el) {
        addGetterElement(el, properties, selector)
        drawElement(el)
      }
    })
  }
  function addGetterElement(el, properties, selector) {
    var i = 0,
      prop,
      j
    const selectors = selector.split(',') // split grouped selectors
    el.setAttribute('iecp-needed', true)
    if (!el.ieCPSelectors) el.ieCPSelectors = {}
    while ((prop = properties[i++])) {
      for (j = 0; (selector = selectors[j++]); ) {
        const parts = selector.trim().split('::')
        if (!el.ieCPSelectors[prop]) el.ieCPSelectors[prop] = []
        el.ieCPSelectors[prop].push({
          selector: parts[0],
          pseudo: parts[1] ? '::' + parts[1] : ''
        })
      }
    }
  }
  function addSettersSelector(selector, propVals) {
    selectorAddPseudoListeners(selector)
    c1.onElement(unPseudo(selector), {
      immediate: function(el) {
        addSetterElement(el, propVals)
      }
    })
  }
  function addSetterElement(el, propVals) {
    if (!el.ieCP_setters) el.ieCP_setters = {}
    for (var prop in propVals) {
      // eg. {foo:#fff, bar:baz}
      el.ieCP_setters['--' + prop] = 1
    }
    drawTree(el)
  }

  //beta
  function redrawStyleSheets() {
    for (var prop in styles_of_getter_properties) {
      let styles = styles_of_getter_properties[prop]
      for (var i = 0, style; (style = styles[i++]); ) {
        if (style.owningElement) continue
        var value = style['-ieVar-' + prop]
        if (!value) continue
        var value = styleComputeValueWidthVars(
          getComputedStyle(document.documentElement),
          value
        )
        if (value === '') continue
        style[prop] = value
      }
    }
  }

  const pseudos = {
    hover: {
      on: 'mouseenter',
      off: 'mouseleave'
    },
    focus: {
      on: 'focusin',
      off: 'focusout'
    },
    active: {
      on: 'CSSActivate',
      off: 'CSSDeactivate'
    }
  }
  function selectorAddPseudoListeners(selector) {
    // ie11 has the strange behavoir, that groups of selectors are individual rules, but starting with the full selector:
    // td, th, button { color:red } results in this rules:
    // "td, th, button" | "th, th" | "th"
    selector = selector.split(',')[0]
    for (var pseudo in pseudos) {
      var parts = selector.split(':' + pseudo)
      if (parts.length > 1) {
        var ending = parts[1].match(/^[^\s]*/) // ending elementpart of selector (used for not(:active))
        let sel = unPseudo(parts[0] + ending)
        const listeners = pseudos[pseudo]
        c1.onElement(sel, function(el) {
          el.addEventListener(listeners.on, drawTreeEvent)
          el.addEventListener(listeners.off, drawTreeEvent)
        })
      }
    }
  }
  let CSSActive = null
  document.addEventListener('mousedown', function(e) {
    setTimeout(function() {
      if (e.target === document.activeElement) {
        var evt = document.createEvent('Event')
        evt.initEvent('CSSActivate', true, true)
        CSSActive = e.target
        CSSActive.dispatchEvent(evt)
      }
    })
  })
  document.addEventListener('mouseup', function() {
    if (CSSActive) {
      var evt = document.createEvent('Event')
      evt.initEvent('CSSDeactivate', true, true)
      CSSActive.dispatchEvent(evt)
      CSSActive = null
    }
  })

  function unPseudo(selector) {
    return selector.replace(regPseudos, '').replace(':not()', '')
  }

  var uniqueCounter = 0

  function _drawElement(el) {
    if (!el.ieCP_unique) {
      // use el.uniqueNumber? but needs class for the css-selector => test performance
      el.ieCP_unique = ++uniqueCounter
      el.classList.add('iecp-u' + el.ieCP_unique)
    }
    var style = getComputedStyle(el)
    if (el.ieCP_sheet)
      while (el.ieCP_sheet.rules[0]) el.ieCP_sheet.deleteRule(0)
    for (var prop in el.ieCPSelectors) {
      var important = style['-ieVar-❗' + prop]
      let valueWithVar = important || style['-ieVar-' + prop]
      if (!valueWithVar) continue // todo, what if '0'

      var details = {}
      var value = styleComputeValueWidthVars(style, valueWithVar, details)

      if (important) value += ' !important'
      for (var i = 0, item; (item = el.ieCPSelectors[prop][i++]); ) {
        // todo: split and use requestAnimationFrame?
        if (item.selector === '%styleAttr') {
          el.style[prop] = value
        } else {
          // beta
          if (!important && details.allByRoot !== false) continue // dont have to draw root-properties

          //let selector = item.selector.replace(/>? \.[^ ]+/, ' ', item.selector); // todo: try to equalize specificity
          let selector = item.selector
          elementStyleSheet(el).insertRule(
            selector +
              '.iecp-u' +
              el.ieCP_unique +
              item.pseudo +
              ' {' +
              prop +
              ':' +
              value +
              '}',
            0
          ) // faster then innerHTML
        }
      }
    }
  }
  function elementStyleSheet(el) {
    if (!el.ieCP_sheet) {
      var tag = document.createElement('style')
      tag.ieCP_elementSheet = 1
      //el.appendChild(tag); // yes! self-closing tags can have style as children, but - if i set innerHTML, the stylesheet is lost
      document.head.appendChild(tag)
      el.ieCP_sheet = tag.sheet
    }
    return el.ieCP_sheet
  }
  function drawTree(target) {
    if (!target) return
    var els = target.querySelectorAll('[iecp-needed]')
    if (target.hasAttribute && target.hasAttribute('iecp-needed'))
      drawElement(target) // self
    for (var i = 0, el; (el = els[i++]); ) drawElement(el) // tree
  }
  // draw queue
  let drawQueue = new Set()
  let collecting = false
  let drawing = false
  function drawElement(el) {
    drawQueue.add(el)
    if (collecting) return
    collecting = true
    requestAnimationFrame(function() {
      collecting = false
      drawing = true
      drawQueue.forEach(_drawElement)
      requestAnimationFrame(function() {
        // mutationObserver will trigger delayed
        drawing = false
      })
      drawQueue.clear()
    })
  }

  function drawTreeEvent(e) {
    drawTree(e.target)
  }

  const regValueGetters = /var\(([^),]+)(\,(.+))?\)/g
  function styleComputeValueWidthVars(style, valueWithVar, details) {
    return valueWithVar.replace(regValueGetters, function(
      full,
      variable,
      x,
      fallback
    ) {
      variable = variable.trim()
      var pValue = style.getPropertyValue(variable)
      if (details && style.lastPropertyServedBy !== document.documentElement)
        details.allByRoot = false
      if (pValue === '' && fallback !== undefined) pValue = fallback.trim() // fallback
      return pValue
    })
  }

  // mutation listener
  var observer = new MutationObserver(function(mutations) {
    if (drawing) return
    for (var i = 0, mutation; (mutation = mutations[i++]); ) {
      if (mutation.attributeName === 'ie-polyfilled') continue
      if (mutation.attributeName === 'iecp-needed') continue
      // recheck all selectors if it targets new elements?
      drawTree(mutation.target)
    }
  })
  setTimeout(function() {
    observer.observe(document, { attributes: true, subtree: true })
  })

  // :target listener
  var oldHash = location.hash
  addEventListener('hashchange', function(e) {
    var newEl = document.getElementById(location.hash.substr(1))
    if (newEl) {
      var oldEl = document.getElementById(oldHash.substr(1))
      drawTree(newEl)
      drawTree(oldEl)
    } else {
      drawTree(document)
    }
    oldHash = location.hash
  })

  // add owningElement to Element.style
  var descriptor = Object.getOwnPropertyDescriptor(
    HTMLElement.prototype,
    'style'
  )
  var styleGetter = descriptor.get
  descriptor.get = function() {
    const style = styleGetter.call(this)
    style.owningElement = this
    return style
  }
  Object.defineProperty(HTMLElement.prototype, 'style', descriptor)

  // add computedFor to computed style-objects
  var originalGetComputed = getComputedStyle
  window.getComputedStyle = function(el) {
    var style = originalGetComputed.apply(this, arguments)
    style.computedFor = el
    //style.pseudoElt = pseudoElt; //not needed at the moment
    return style
  }

  // getPropertyValue / setProperty hooks
  const StyleProto = CSSStyleDeclaration.prototype

  const oldGetP = StyleProto.getPropertyValue
  StyleProto.getPropertyValue = function(property) {
    this.lastPropertyServedBy = false
    if (property[0] !== '-' || property[1] !== '-')
      return oldGetP.apply(this, arguments)
    const undashed = property.substr(2)
    const ieProperty = '-ie-' + undashed
    const iePropertyImportant = '-ie-❗' + undashed
    let value = this[iePropertyImportant] || this[ieProperty]
    if (this.computedFor) {
      // computedStyle
      if (value !== undefined) {
        if (regHasVar.test(value)) {
          value = styleComputeValueWidthVars(this, value)
        }
        this.lastPropertyServedBy = this.computedFor
      } else {
        if (!register[property] || register[property].inherits) {
          // inherited
          //let el = this.pseudoElt ? this.computedFor : this.computedFor.parentNode;
          let el = this.computedFor.parentNode
          while (el.nodeType === 1) {
            // how slower would it be to getComputedStyle for every element, not just with defined ieCP_setters
            if (el.ieCP_setters && el.ieCP_setters[property]) {
              // i could make
              // value = el.nodeType ? getComputedStyle(this.computedFor.parentNode).getPropertyValue(property)
              // but i fear performance, stupid?
              var style = getComputedStyle(el)
              var tmpVal = style[iePropertyImportant] || style[ieProperty]
              if (tmpVal !== undefined) {
                value = tmpVal
                if (regHasVar.test(value)) {
                  // calculated style from current element not from the element the value was inherited from! (style, value)
                  value = styleComputeValueWidthVars(this, value)
                }
                this.lastPropertyServedBy = el
                break
              }
            }
            el = el.parentNode
          }
        }
      }
    }
    if (value === undefined && register[property])
      value = register[property].initialValue
    if (value === undefined) value = ''
    return value
  }

  const oldSetP = StyleProto.setProperty
  StyleProto.setProperty = function(property, value, prio) {
    if (property[0] !== '-' || property[1] !== '-')
      return oldSetP.apply(this, arguments)
    if (this.owningElement) {
      const el = this.owningElement
      if (!el.ieCP_setters) el.ieCP_setters = {}
      el.ieCP_setters[property] = 1
      drawTree(el)
    }
    property = '-ie-' + (prio === 'important' ? '❗' : '') + property.substr(2)
    this.cssText += '; ' + property + ':' + value + ';'
    //this[property] = value;
  }

  if (!window.CSS) window.CSS = {}
  const register = {}
  CSS.registerProperty = function(options) {
    register[options.name] = options
  }

  // utils
  function fetchCss(url, callback) {
    var request = new XMLHttpRequest()
    request.open('GET', url)
    request.overrideMimeType('text/css')
    request.onload = function() {
      if (request.status >= 200 && request.status < 400) {
        callback(request.responseText)
      }
    }
    request.send()
  }
})()