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define([
  'summernote/core/agent',
  'summernote/core/func',
  'summernote/core/list',
  'summernote/core/dom'
], function (agent, func, list, dom) {
  /**
   * @class editing.Style
   *
   * Style
   *
   */
  var Style = function () {
    /**
     * @method jQueryCSS
     *
     * [workaround] for old jQuery
     * passing an array of style properties to .css()
     * will result in an object of property-value pairs.
     * (compability with version < 1.9)
     *
     * @private
     * @param  {jQuery} $obj
     * @param  {Array} propertyNames - An array of one or more CSS properties.
     * @return {Object}
     */
    var jQueryCSS = function ($obj, propertyNames) {
      if (agent.jqueryVersion < 1.9) {
        var result = {};
        $.each(propertyNames, function (idx, propertyName) {
          result[propertyName] = $obj.css(propertyName);
        });
        return result;
      }
      return $obj.css.call($obj, propertyNames);
    };

    /**
     * returns style object from node
     *
     * @param {jQuery} $node
     * @return {Object}
     */
    this.fromNode = function ($node) {
      var properties = ['font-family', 'font-size', 'text-align', 'list-style-type', 'line-height'];
      var styleInfo = jQueryCSS($node, properties) || {};
      styleInfo['font-size'] = parseInt(styleInfo['font-size'], 10);
      return styleInfo;
    };

    /**
     * paragraph level style
     *
     * @param {WrappedRange} rng
     * @param {Object} styleInfo
     */
    this.stylePara = function (rng, styleInfo) {
      $.each(rng.nodes(dom.isPara, {
        includeAncestor: true
      }), function (idx, para) {
        $(para).css(styleInfo);
      });
    };

    /**
     * insert and returns styleNodes on range.
     *
     * @param {WrappedRange} rng
     * @param {Object} [options] - options for styleNodes
     * @param {String} [options.nodeName] - default: `SPAN`
     * @param {Boolean} [options.expandClosestSibling] - default: `false`
     * @param {Boolean} [options.onlyPartialContains] - default: `false`
     * @return {Node[]}
     */
    this.styleNodes = function (rng, options) {
      rng = rng.splitText();

      var nodeName = options && options.nodeName || 'SPAN';
      var expandClosestSibling = !!(options && options.expandClosestSibling);
      var onlyPartialContains = !!(options && options.onlyPartialContains);

      if (rng.isCollapsed()) {
        return [rng.insertNode(dom.create(nodeName))];
      }

      var pred = dom.makePredByNodeName(nodeName);
      var nodes = rng.nodes(dom.isText, {
        fullyContains: true
      }).map(function (text) {
        return dom.singleChildAncestor(text, pred) || dom.wrap(text, nodeName);
      });

      if (expandClosestSibling) {
        if (onlyPartialContains) {
          var nodesInRange = rng.nodes();
          // compose with partial contains predication
          pred = func.and(pred, function (node) {
            return list.contains(nodesInRange, node);
          });
        }

        return nodes.map(function (node) {
          var siblings = dom.withClosestSiblings(node, pred);
          var head = list.head(siblings);
          var tails = list.tail(siblings);
          $.each(tails, function (idx, elem) {
            dom.appendChildNodes(head, elem.childNodes);
            dom.remove(elem);
          });
          return list.head(siblings);
        });
      } else {
        return nodes;
      }
    };

    /**
     * get current style on cursor
     *
     * @param {WrappedRange} rng
     * @return {Object} - object contains style properties.
     */
    this.current = function (rng) {
      var $cont = $(dom.isText(rng.sc) ? rng.sc.parentNode : rng.sc);
      var styleInfo = this.fromNode($cont);

      // document.queryCommandState for toggle state
      styleInfo['font-bold'] = document.queryCommandState('bold') ? 'bold' : 'normal';
      styleInfo['font-italic'] = document.queryCommandState('italic') ? 'italic' : 'normal';
      styleInfo['font-underline'] = document.queryCommandState('underline') ? 'underline' : 'normal';
      styleInfo['font-strikethrough'] = document.queryCommandState('strikeThrough') ? 'strikethrough' : 'normal';
      styleInfo['font-superscript'] = document.queryCommandState('superscript') ? 'superscript' : 'normal';
      styleInfo['font-subscript'] = document.queryCommandState('subscript') ? 'subscript' : 'normal';

      // list-style-type to list-style(unordered, ordered)
      if (!rng.isOnList()) {
        styleInfo['list-style'] = 'none';
      } else {
        var aOrderedType = ['circle', 'disc', 'disc-leading-zero', 'square'];
        var isUnordered = $.inArray(styleInfo['list-style-type'], aOrderedType) > -1;
        styleInfo['list-style'] = isUnordered ? 'unordered' : 'ordered';
      }

      var para = dom.ancestor(rng.sc, dom.isPara);
      if (para && para.style['line-height']) {
        styleInfo['line-height'] = para.style.lineHeight;
      } else {
        var lineHeight = parseInt(styleInfo['line-height'], 10) / parseInt(styleInfo['font-size'], 10);
        styleInfo['line-height'] = lineHeight.toFixed(1);
      }

      styleInfo.anchor = rng.isOnAnchor() && dom.ancestor(rng.sc, dom.isAnchor);
      styleInfo.ancestors = dom.listAncestor(rng.sc, dom.isEditable);
      styleInfo.range = rng;

      return styleInfo;
    };
  };

  return Style;
});