<!--
Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">

<!--
@element core-overlay-layer
-->
<polymer-element name="core-overlay-layer">
<template>
  <style>
    :host {
      position: fixed;
      top: 0;
      left: 0;
      z-index: 1000;
      display: none;
    }

    :host(.core-opened) {
      display: block;
    }
  </style>
  <content></content>
</template>
<script>
(function() {

  Polymer('core-overlay-layer', {
    publish: {
      opened: false
    },
    openedChanged: function() {
      this.classList.toggle('core-opened', this.opened);
    },
    /**
     * Adds an element to the overlay layer
     */
    addElement: function(element) {
      if (!this.parentNode) {
        document.querySelector('body').appendChild(this);
      }
      if (element.parentNode !== this) {
        element.__contents = [];
        var ip$ = element.querySelectorAll('content');
        for (var i=0, l=ip$.length, n; (i<l) && (n = ip$[i]); i++) {
          this.moveInsertedElements(n);
          this.cacheDomLocation(n);
          n.parentNode.removeChild(n);
          element.__contents.push(n);
        }
        this.cacheDomLocation(element);
        this.updateEventController(element);
        var h = this.makeHost();
        h.shadowRoot.appendChild(element);
        element.__host = h;
      }
    },
    makeHost: function() {
      var h = document.createElement('overlay-host');
      h.createShadowRoot();
      this.appendChild(h);
      return h;
    },
    moveInsertedElements: function(insertionPoint) {
      var n$ = insertionPoint.getDistributedNodes();
      var parent = insertionPoint.parentNode;
      insertionPoint.__contents = [];
      for (var i=0, l=n$.length, n; (i<l) && (n=n$[i]); i++) {
        this.cacheDomLocation(n);
        this.updateEventController(n);
        insertionPoint.__contents.push(n);
        parent.appendChild(n);  
      }
    },
    updateEventController: function(element) {
      element.eventController = this.element.findController(element);
    },
    /**
     * Removes an element from the overlay layer
     */
    removeElement: function(element) {
      element.eventController = null;
      this.replaceElement(element);
      var h = element.__host;
      if (h) {
        h.parentNode.removeChild(h);
      }
    },
    replaceElement: function(element) {
      if (element.__contents) {
        for (var i=0, c$=element.__contents, c; (c=c$[i]); i++) {
          this.replaceElement(c);
        }
        element.__contents = null;
      }
      if (element.__parentNode) {
        var n = element.__nextElementSibling && element.__nextElementSibling 
            === element.__parentNode ? element.__nextElementSibling : null;
        element.__parentNode.insertBefore(element, n);
      }
    },
    cacheDomLocation: function(element) {
      element.__nextElementSibling = element.nextElementSibling;
      element.__parentNode = element.parentNode;
    }
  });
  
})();
</script>
</polymer-element>