/*
 * jQuery OrgChart Plugin
 * https://github.com/dabeng/OrgChart
 *
 * Copyright 2016, dabeng
 * https://github.com/dabeng
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */
'use strict';

(function (factory) {
  if (typeof module === 'object' && typeof module.exports === 'object') {
    factory(require('jquery'), window, document);
  } else {
    factory(jQuery, window, document);
  }
}(function ($, window, document, undefined) {
  var OrgChart = function (elem, opts) {
    this.$chartContainer = $(elem);
    this.opts = opts;
    this.defaultOptions = {
      'nodeTitle': 'name',
      'nodeId': 'id',
      'toggleSiblingsResp': false,
      'visibleLevel': 999,
      'chartClass': '',
      'exportButton': false,
      'exportFilename': 'OrgChart',
      'exportFileextension': 'png',
      'parentNodeSymbol': 'fa-caret-down',/* fa-users */
      'draggable': false,
      'direction': 't2b',
      'pan': false,
      'zoom': false,
      'zoominLimit': 7,
      'zoomoutLimit': 0.5
    };
  };
  //
  OrgChart.prototype = {
    //
    init: function (opts) {
      var that = this;
      this.options = $.extend({}, this.defaultOptions, this.opts, opts);
      // build the org-chart
      var $chartContainer = this.$chartContainer;
      if (this.$chart) {
        this.$chart.remove();
      }
      var data = this.options.data;
      var $chart = this.$chart = $('<div>', {
        'data': { 'options': this.options },
        'class': 'orgchart' + (this.options.chartClass !== '' ? ' ' + this.options.chartClass : '') + (this.options.direction !== 't2b' ? ' ' + this.options.direction : ''),
        'click': function(event) {
          if (!$(event.target).closest('.node').length) {
            $chart.find('.node.focused').removeClass('focused');
          }
        }
      });
      if (typeof MutationObserver !== 'undefined') {
        this.triggerInitEvent();
      }
      if ($.type(data) === 'object') {
        if (data instanceof $) { // ul datasource
          this.buildHierarchy($chart, this.buildJsonDS(data.children()), 0, this.options);
        } else { // local json datasource
          this.buildHierarchy($chart, this.options.ajaxURL ? data : this.attachRel(data, '00'));
        }
      } else {
        $chart.append('<i class="fa fa-circle-o-notch fa-spin spinner"></i>');
        $.ajax({
          'url': data,
          'dataType': 'json'
        })
        .done(function(data, textStatus, jqXHR) {
          that.buildHierarchy($chart, that.options.ajaxURL ? data : that.attachRel(data, '00'), 0, that.options);
        })
        .fail(function(jqXHR, textStatus, errorThrown) {
          console.log(errorThrown);
        })
        .always(function() {
          $chart.children('.spinner').remove();
        });
      }
      $chartContainer.append($chart);

      // append the export button
      if (this.options.exportButton && !$chartContainer.find('.oc-export-btn').length) {
        this.attachExportButton();
      }

      if (this.options.pan) {
        this.bindPan();
      }

      if (this.options.zoom) {
        this.bindZoom();
      }

      return this;
    },
    //
    triggerInitEvent: function () {
      var that = this;
      var mo = new MutationObserver(function (mutations) {
        mo.disconnect();
        initTime:
        for (var i = 0; i < mutations.length; i++) {
          for (var j = 0; j < mutations[i].addedNodes.length; j++) {
            if (mutations[i].addedNodes[j].classList.contains('orgchart')) {
              if (that.options.initCompleted && typeof that.options.initCompleted === 'function') {
                that.options.initCompleted(that.$chart);
                var initEvent = $.Event('init.orgchart');
                that.$chart.trigger(initEvent);
                break initTime;
              }
            }
          }
        }
      });
      mo.observe(this.$chartContainer[0], { childList: true });
    },
    //
    attachExportButton: function () {
      var that = this;
      var $exportBtn = $('<button>', {
        'class': 'oc-export-btn' + (this.options.chartClass !== '' ? ' ' + this.options.chartClass : ''),
        'text': 'Export',
        'click': function(e) {
          e.preventDefault();
          that.export();
        }
      });
      this.$chartContainer.append($exportBtn);
    },
    setOptions: function (opts, val) {
      if (typeof opts === 'string') {
        if (opts === 'pan') {
          if (val) {
            this.bindPan();
          } else {
            this.unbindPan();
          }
        }
        if (opts === 'zoom') {
          if (val) {
            this.bindZoom();
          } else {
            this.unbindZoom();
          }
        }
      }
      if (typeof opts === 'object') {
        if (opts.data) {
          this.init(opts);
        } else {
          if (typeof opts.pan !== 'undefined') {
            if (opts.pan) {
              this.bindPan();
            } else {
              this.unbindPan();
            }
          }
          if (typeof opts.zoom !== 'undefined') {
            if (opts.zoom) {
              this.bindZoom();
            } else {
              this.unbindZoom();
            }
          }
        }
      }

      return this;
    },
    //
    panStartHandler: function (e) {
      var $chart = $(e.delegateTarget);
      if ($(e.target).closest('.node').length || (e.touches && e.touches.length > 1)) {
        $chart.data('panning', false);
        return;
      } else {
        $chart.css('cursor', 'move').data('panning', true);
      }
      var lastX = 0;
      var lastY = 0;
      var lastTf = $chart.css('transform');
      if (lastTf !== 'none') {
        var temp = lastTf.split(',');
        if (lastTf.indexOf('3d') === -1) {
          lastX = parseInt(temp[4]);
          lastY = parseInt(temp[5]);
        } else {
          lastX = parseInt(temp[12]);
          lastY = parseInt(temp[13]);
        }
      }
      var startX = 0;
      var startY = 0;
      if (!e.targetTouches) { // pand on desktop
        startX = e.pageX - lastX;
        startY = e.pageY - lastY;
      } else if (e.targetTouches.length === 1) { // pan on mobile device
        startX = e.targetTouches[0].pageX - lastX;
        startY = e.targetTouches[0].pageY - lastY;
      } else if (e.targetTouches.length > 1) {
        return;
      }
      $chart.on('mousemove touchmove',function(e) {
        if (!$chart.data('panning')) {
          return;
        }
        var newX = 0;
        var newY = 0;
        if (!e.targetTouches) { // pand on desktop
          newX = e.pageX - startX;
          newY = e.pageY - startY;
        } else if (e.targetTouches.length === 1) { // pan on mobile device
          newX = e.targetTouches[0].pageX - startX;
          newY = e.targetTouches[0].pageY - startY;
        } else if (e.targetTouches.length > 1) {
          return;
        }
        var lastTf = $chart.css('transform');
        if (lastTf === 'none') {
          if (lastTf.indexOf('3d') === -1) {
            $chart.css('transform', 'matrix(1, 0, 0, 1, ' + newX + ', ' + newY + ')');
          } else {
            $chart.css('transform', 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, ' + newX + ', ' + newY + ', 0, 1)');
          }
        } else {
          var matrix = lastTf.split(',');
          if (lastTf.indexOf('3d') === -1) {
            matrix[4] = ' ' + newX;
            matrix[5] = ' ' + newY + ')';
          } else {
            matrix[12] = ' ' + newX;
            matrix[13] = ' ' + newY;
          }
          $chart.css('transform', matrix.join(','));
        }
      });
    },
    //
    panEndHandler: function (e) {
      if (e.data.chart.data('panning')) {
        e.data.chart.data('panning', false).css('cursor', 'default').off('mousemove');
      }
    },
    //
    bindPan: function () {
      this.$chartContainer.css('overflow', 'hidden');
      this.$chart.on('mousedown touchstart', this.panStartHandler);
      $(document).on('mouseup touchend', { 'chart': this.$chart }, this.panEndHandler);
    },
    //
    unbindPan: function () {
      this.$chartContainer.css('overflow', 'auto');
      this.$chart.off('mousedown touchstart', this.panStartHandler);
      $(document).off('mouseup touchend', this.panEndHandler);
    },
    //
    zoomWheelHandler: function (e) {
      var oc = e.data.oc;
      e.preventDefault();
      var newScale  = 1 + (e.originalEvent.deltaY > 0 ? -0.2 : 0.2);
      oc.setChartScale(oc.$chart, newScale);
    },
    //
    zoomStartHandler: function (e) {
      if(e.touches && e.touches.length === 2) {
        var oc = e.data.oc;
        oc.$chart.data('pinching', true);
        var dist = oc.getPinchDist(e);
        oc.$chart.data('pinchDistStart', dist);
      }
    },
    zoomingHandler: function (e) {
      var oc = e.data.oc;
      if(oc.$chart.data('pinching')) {
        var dist = oc.getPinchDist(e);
        oc.$chart.data('pinchDistEnd', dist);
      }
    },
    zoomEndHandler: function (e) {
      var oc = e.data.oc;
      if(oc.$chart.data('pinching')) {
        oc.$chart.data('pinching', false);
        var diff = oc.$chart.data('pinchDistEnd') - oc.$chart.data('pinchDistStart');
        if (diff > 0) {
          oc.setChartScale(oc.$chart, 1.2);
        } else if (diff < 0) {
          oc.setChartScale(oc.$chart, 0.8);
        }
      }
    },
    //
    bindZoom: function () {
      this.$chartContainer.on('wheel', { 'oc': this }, this.zoomWheelHandler);
      this.$chartContainer.on('touchstart', { 'oc': this }, this.zoomStartHandler);
      $(document).on('touchmove', { 'oc': this }, this.zoomingHandler);
      $(document).on('touchend', { 'oc': this }, this.zoomEndHandler);
    },
    unbindZoom: function () {
      this.$chartContainer.off('wheel', this.zoomWheelHandler);
      this.$chartContainer.off('touchstart', this.zoomStartHandler);
      $(document).off('touchmove', this.zoomingHandler);
      $(document).off('touchend', this.zoomEndHandler);
    },
    //
    getPinchDist: function (e) {
      return Math.sqrt((e.touches[0].clientX - e.touches[1].clientX) * (e.touches[0].clientX - e.touches[1].clientX) +
      (e.touches[0].clientY - e.touches[1].clientY) * (e.touches[0].clientY - e.touches[1].clientY));
    },
    //
    setChartScale: function ($chart, newScale) {
      var opts = $chart.data('options');
      var lastTf = $chart.css('transform');
      var matrix = '';
      var targetScale = 1;
      if (lastTf === 'none') {
        $chart.css('transform', 'scale(' + newScale + ',' + newScale + ')');
      } else {
        matrix = lastTf.split(',');
        if (lastTf.indexOf('3d') === -1) {
          targetScale = Math.abs(window.parseFloat(matrix[3]) * newScale);
          if (targetScale > opts.zoomoutLimit && targetScale < opts.zoominLimit) {
            $chart.css('transform', lastTf + ' scale(' + newScale + ',' + newScale + ')');
          }
        } else {
          targetScale = Math.abs(window.parseFloat(matrix[1]) * newScale);
          if (targetScale > opts.zoomoutLimit && targetScale < opts.zoominLimit) {
            $chart.css('transform', lastTf + ' scale3d(' + newScale + ',' + newScale + ', 1)');
          }
        }
      }
    },
    //
    buildJsonDS: function ($li) {
      var that = this;
      var subObj = {
        'name': $li.contents().eq(0).text().trim(),
        'relationship': ($li.parent().parent().is('li') ? '1': '0') + ($li.siblings('li').length ? 1: 0) + ($li.children('ul').length ? 1 : 0)
      };
      if ($li.attr('data-id')) {
        subObj.id = $li.attr('data-id');
      }
      $li.children('ul').children().each(function() {
        if (!subObj.children) { subObj.children = []; }
        subObj.children.push(that.buildJsonDS($(this)));
      });
      return subObj;
    },
    //
    attachRel: function (data, flags) {
      var that = this;
      data.relationship = flags + (data.children && data.children.length > 0 ? 1 : 0);
      if (data.children) {
        data.children.forEach(function(item) {
          that.attachRel(item, '1' + (data.children.length > 1 ? 1 : 0));
        });
      }
      return data;
    },
    //
    loopChart: function ($chart) {
      var that = this;
      var $tr = $chart.find('tr:first');
      var subObj = { 'id': $tr.find('.node')[0].id };
      $tr.siblings(':last').children().each(function() {
        if (!subObj.children) { subObj.children = []; }
        subObj.children.push(that.loopChart($(this)));
      });
      return subObj;
    },
    //
    getHierarchy: function () {
      if (typeof this.$chart === 'undefined') {
        return 'Error: orgchart does not exist'
      } else {
        if (!this.$chart.find('.node').length) {
          return 'Error: nodes do not exist'
        } else {
          var valid = true;
          this.$chart.find('.node').each(function () {
            if (!this.id) {
              valid = false;
              return false;
            }
          });
          if (!valid) {
            return 'Error: All nodes of orghcart to be exported must have data-id attribute!';
          }
        }
      }
      return this.loopChart(this.$chart);
    },
    // detect the exist/display state of related node
    getNodeState: function ($node, relation) {
      var $target = {};
      var relation = relation || 'self';
      if (relation === 'parent') {
        $target = $node.closest('.nodes').siblings(':first');
        if ($target.length) {
          if ($target.is('.hidden') || (!$target.is('.hidden') && $target.closest('.nodes').is('.hidden'))) {
            return { 'exist': true, 'visible': false };
          }
          return { 'exist': true, 'visible': true };
        }
      } else if (relation === 'children') {
        $target = $node.closest('tr').siblings(':last');
        if ($target.length) {
          if (!$target.is('.hidden')) {
            return { 'exist': true, 'visible': true };
          }
          return { 'exist': true, 'visible': false };
        }
      } else if (relation === 'siblings') {
        $target = $node.closest('table').parent().siblings();
        if ($target.length) {
          if (!$target.is('.hidden') && !$target.parent().is('.hidden')) {
            return { 'exist': true, 'visible': true };
          }
          return { 'exist': true, 'visible': false };
        }
      } else {
        $target = $node;
        if ($target.length) {
          if (!(($target.closest('.nodes').length && $target.closest('.nodes').is('.hidden')) ||
            ($target.closest('table').parent().length && $target.closest('table').parent().is('.hidden')) ||
            ($target.parent().is('li') && ($target.closest('ul').is('.hidden') || $target.closest('verticalNodes').is('.hidden')))
          )) {
            return { 'exist': true, 'visible': true };
          }
          return { 'exist': true, 'visible': false };
        }
      }
      return { 'exist': false, 'visible': false };
    },
    // find the related nodes
    getRelatedNodes: function ($node, relation) {
      if (!$node || !($node instanceof $) || !$node.is('.node')) {
        return $();
      }
      if (relation === 'parent') {
        return $node.closest('.nodes').parent().children(':first').find('.node');
      } else if (relation === 'children') {
        return $node.closest('tr').siblings('.nodes').children().find('.node:first');
      } else if (relation === 'siblings') {
        return $node.closest('table').parent().siblings().find('.node:first');
      } else {
        return $();
      }
    },
    hideParentEnd: function (event) {
      $(event.target).removeClass('sliding');
      event.data.upperLevel.addClass('hidden').slice(1).removeAttr('style');
    },
    // recursively hide the ancestor node and sibling nodes of the specified node
    hideParent: function ($node) {
      var $upperLevel = $node.closest('.nodes').siblings();
      if ($upperLevel.eq(0).find('.spinner').length) {
        $node.closest('.orgchart').data('inAjax', false);
      }
      // hide the sibling nodes
      if (this.getNodeState($node, 'siblings').visible) {
        this.hideSiblings($node);
      }
      // hide the lines
      var $lines = $upperLevel.slice(1);
      $lines.css('visibility', 'hidden');
      // hide the superior nodes with transition
      var $parent = $upperLevel.eq(0).find('.node');
      if (this.getNodeState($parent).visible) {
        $parent.addClass('sliding slide-down').one('transitionend', { 'upperLevel': $upperLevel }, this.hideParentEnd);
      }
      // if the current node has the parent node, hide it recursively
      if (this.getNodeState($parent, 'parent').visible) {
        this.hideParent($parent);
      }
    },
    showParentEnd: function (event) {
      var $node = event.data.node;
      $(event.target).removeClass('sliding');
      if (this.isInAction($node)) {
        this.switchVerticalArrow($node.children('.topEdge'));
      }
    },
    // show the parent node of the specified node
    showParent: function ($node) {
      // just show only one superior level
      var $upperLevel = $node.closest('.nodes').siblings().removeClass('hidden');
      // just show only one line
      $upperLevel.eq(2).children().slice(1, -1).addClass('hidden');
      // show parent node with animation
      var $parent = $upperLevel.eq(0).find('.node');
      this.repaint($parent[0]);
      $parent.addClass('sliding').removeClass('slide-down').one('transitionend', { 'node': $node }, this.showParentEnd.bind(this));
    },
    stopAjax: function ($nodeLevel) {
      if ($nodeLevel.find('.spinner').length) {
        $nodeLevel.closest('.orgchart').data('inAjax', false);
      }
    },
    isVisibleNode: function (index, elem) {
      return this.getNodeState($(elem)).visible;
    },
    //
    hideChildrenEnd: function (event) {
      var $node = event.data.node;
      event.data.animatedNodes.removeClass('sliding');
      if (event.data.isVerticalDesc) {
        event.data.lowerLevel.addClass('hidden');
      } else {
        event.data.animatedNodes.closest('.nodes').prevAll('.lines').removeAttr('style').addBack().addClass('hidden');
        event.data.lowerLevel.last().find('.verticalNodes').addClass('hidden');
      }
      if (this.isInAction($node)) {
        this.switchVerticalArrow($node.children('.bottomEdge'));
      }
    },
    // recursively hide the descendant nodes of the specified node
    hideChildren: function ($node) {
      var $lowerLevel = $node.closest('tr').siblings();
      this.stopAjax($lowerLevel.last());
      var $animatedNodes = $lowerLevel.last().find('.node').filter(this.isVisibleNode.bind(this));
      var isVerticalDesc = $lowerLevel.last().is('.verticalNodes') ? true : false;
      if (!isVerticalDesc) {
        $animatedNodes.closest('table').closest('tr').prevAll('.lines').css('visibility', 'hidden');
      }
      this.repaint($animatedNodes.get(0));
      $animatedNodes.addClass('sliding slide-up').eq(0).one('transitionend', { 'animatedNodes': $animatedNodes, 'lowerLevel': $lowerLevel, 'isVerticalDesc': isVerticalDesc, 'node': $node }, this.hideChildrenEnd.bind(this));
    },
    //
    showChildrenEnd: function (event) {
      var $node = event.data.node;
      event.data.animatedNodes.removeClass('sliding');
      if (this.isInAction($node)) {
        this.switchVerticalArrow($node.children('.bottomEdge'));
      }
    },
    // show the children nodes of the specified node
    showChildren: function ($node) {
      var that = this;
      var $levels = $node.closest('tr').siblings();
      var isVerticalDesc = $levels.is('.verticalNodes') ? true : false;
      var $animatedNodes = isVerticalDesc
        ? $levels.removeClass('hidden').find('.node').filter(this.isVisibleNode.bind(this))
        : $levels.removeClass('hidden').eq(2).children().find('.node:first').filter(this.isVisibleNode.bind(this));
      // the two following statements are used to enforce browser to repaint
      this.repaint($animatedNodes.get(0));
      $animatedNodes.addClass('sliding').removeClass('slide-up').eq(0).one('transitionend', { 'node': $node, 'animatedNodes': $animatedNodes }, this.showChildrenEnd.bind(this));
    },
    //
    hideSiblingsEnd: function (event) {
      var $node = event.data.node;
      var $nodeContainer = event.data.nodeContainer;
      var direction = event.data.direction;
      event.data.lines.removeAttr('style');
      var $siblings = direction ? (direction === 'left' ? $nodeContainer.prevAll(':not(.hidden)') : $nodeContainer.nextAll(':not(.hidden)')) : $nodeContainer.siblings();
      $nodeContainer.closest('.nodes').prev().children(':not(.hidden)')
        .slice(1, direction ? $siblings.length * 2 + 1 : -1).addClass('hidden');
      event.data.animatedNodes.removeClass('sliding');
      $siblings.find('.node:gt(0)').filter(this.isVisibleNode.bind(this))
        .removeClass('slide-left slide-right').addClass('slide-up');
      $siblings.find('.lines, .nodes, .verticalNodes').addClass('hidden')
        .end().addClass('hidden');

      if (this.isInAction($node)) {
        this.switchHorizontalArrow($node);
      }
    },
    // hide the sibling nodes of the specified node
    hideSiblings: function ($node, direction) {
      var that = this;
      var $nodeContainer = $node.closest('table').parent();
      if ($nodeContainer.siblings().find('.spinner').length) {
        $node.closest('.orgchart').data('inAjax', false);
      }
      if (direction) {
        if (direction === 'left') {
          $nodeContainer.prevAll().find('.node').filter(this.isVisibleNode.bind(this)).addClass('sliding slide-right');
        } else {
          $nodeContainer.nextAll().find('.node').filter(this.isVisibleNode.bind(this)).addClass('sliding slide-left');
        }
      } else {
        $nodeContainer.prevAll().find('.node').filter(this.isVisibleNode.bind(this)).addClass('sliding slide-right');
        $nodeContainer.nextAll().find('.node').filter(this.isVisibleNode.bind(this)).addClass('sliding slide-left');
      }
      var $animatedNodes = $nodeContainer.siblings().find('.sliding');
      var $lines = $animatedNodes.closest('.nodes').prevAll('.lines').css('visibility', 'hidden');
      $animatedNodes.eq(0).one('transitionend', { 'node': $node, 'nodeContainer': $nodeContainer, 'direction': direction, 'animatedNodes': $animatedNodes, 'lines': $lines }, this.hideSiblingsEnd.bind(this));
    },
    //
    showSiblingsEnd: function (event) {
      var $node = event.data.node;
      event.data.visibleNodes.removeClass('sliding');
      if (this.isInAction($node)) {
        this.switchHorizontalArrow($node);
        $node.children('.topEdge').removeClass('fa-chevron-up').addClass('fa-chevron-down');
      }
    },
    //
    showRelatedParentEnd: function(event) {
      $(event.target).removeClass('sliding');
    },
    // show the sibling nodes of the specified node
    showSiblings: function ($node, direction) {
      var that = this;
      // firstly, show the sibling td tags
      var $siblings = $();
      if (direction) {
        if (direction === 'left') {
          $siblings = $node.closest('table').parent().prevAll().removeClass('hidden');
        } else {
          $siblings = $node.closest('table').parent().nextAll().removeClass('hidden');
        }
      } else {
        $siblings = $node.closest('table').parent().siblings().removeClass('hidden');
      }
      // secondly, show the lines
      var $upperLevel = $node.closest('table').closest('tr').siblings();
      if (direction) {
        $upperLevel.eq(2).children('.hidden').slice(0, $siblings.length * 2).removeClass('hidden');
      } else {
        $upperLevel.eq(2).children('.hidden').removeClass('hidden');
      }
      // thirdly, do some cleaning stuff
      if (!this.getNodeState($node, 'parent').visible) {
        $upperLevel.removeClass('hidden');
        var parent = $upperLevel.find('.node')[0];
        this.repaint(parent);
        $(parent).addClass('sliding').removeClass('slide-down').one('transitionend', this.showRelatedParentEnd);
      }
      // lastly, show the sibling nodes with animation
      var $visibleNodes = $siblings.find('.node').filter(this.isVisibleNode.bind(this));
      this.repaint($visibleNodes.get(0));
      $visibleNodes.addClass('sliding').removeClass('slide-left slide-right');
      $visibleNodes.eq(0).one('transitionend', { 'node': $node, 'visibleNodes': $visibleNodes }, this.showSiblingsEnd.bind(this));
    },
    // start up loading status for requesting new nodes
    startLoading: function ($edge) {
      var $chart = this.$chart;
      if (typeof $chart.data('inAjax') !== 'undefined' && $chart.data('inAjax') === true) {
        return false;
      }

      $edge.addClass('hidden');
      $edge.parent().append('<i class="fa fa-circle-o-notch fa-spin spinner"></i>')
        .children().not('.spinner').css('opacity', 0.2);
      $chart.data('inAjax', true);
      $('.oc-export-btn' + (this.options.chartClass !== '' ? '.' + this.options.chartClass : '')).prop('disabled', true);
      return true;
    },
    // terminate loading status for requesting new nodes
    endLoading: function ($edge) {
      var $node = $edge.parent();
      $edge.removeClass('hidden');
      $node.find('.spinner').remove();
      $node.children().removeAttr('style');
      this.$chart.data('inAjax', false);
      $('.oc-export-btn' + (this.options.chartClass !== '' ? '.' + this.options.chartClass : '')).prop('disabled', false);
    },
    // whether the cursor is hovering over the node
    isInAction: function ($node) {
      return $node.children('.edge').attr('class').indexOf('fa-') > -1 ? true : false;
    },
    //
    switchVerticalArrow: function ($arrow) {
      $arrow.toggleClass('fa-chevron-up').toggleClass('fa-chevron-down');
    },
    //
    switchHorizontalArrow: function ($node) {
      var opts = this.options;
      if (opts.toggleSiblingsResp && (typeof opts.ajaxURL === 'undefined' || $node.closest('.nodes').data('siblingsLoaded'))) {
        var $prevSib = $node.closest('table').parent().prev();
        if ($prevSib.length) {
          if ($prevSib.is('.hidden')) {
            $node.children('.leftEdge').addClass('fa-chevron-left').removeClass('fa-chevron-right');
          } else {
            $node.children('.leftEdge').addClass('fa-chevron-right').removeClass('fa-chevron-left');
          }
        }
        var $nextSib = $node.closest('table').parent().next();
        if ($nextSib.length) {
          if ($nextSib.is('.hidden')) {
            $node.children('.rightEdge').addClass('fa-chevron-right').removeClass('fa-chevron-left');
          } else {
            $node.children('.rightEdge').addClass('fa-chevron-left').removeClass('fa-chevron-right');
          }
        }
      } else {
        var $sibs = $node.closest('table').parent().siblings();
        var sibsVisible = $sibs.length ? !$sibs.is('.hidden') : false;
        $node.children('.leftEdge').toggleClass('fa-chevron-right', sibsVisible).toggleClass('fa-chevron-left', !sibsVisible);
        $node.children('.rightEdge').toggleClass('fa-chevron-left', sibsVisible).toggleClass('fa-chevron-right', !sibsVisible);
      }
    },
    //
    repaint: function (node) {
      if (node) {
        node.style.offsetWidth = node.offsetWidth;
      }
    },
    //
    nodeEnterLeaveHandler: function (event) {
      var $node = $(event.delegateTarget), flag = false;
      var $topEdge = $node.children('.topEdge');
      var $rightEdge = $node.children('.rightEdge');
      var $bottomEdge = $node.children('.bottomEdge');
      var $leftEdge = $node.children('.leftEdge');
      if (event.type === 'mouseenter') {
        if ($topEdge.length) {
          flag = this.getNodeState($node, 'parent').visible;
          $topEdge.toggleClass('fa-chevron-up', !flag).toggleClass('fa-chevron-down', flag);
        }
        if ($bottomEdge.length) {
          flag = this.getNodeState($node, 'children').visible;
          $bottomEdge.toggleClass('fa-chevron-down', !flag).toggleClass('fa-chevron-up', flag);
        }
        if ($leftEdge.length) {
          this.switchHorizontalArrow($node);
        }
      } else {
        $node.children('.edge').removeClass('fa-chevron-up fa-chevron-down fa-chevron-right fa-chevron-left');
      }
    },
    //
    nodeClickHandler: function (event) {
      this.$chart.find('.focused').removeClass('focused');
      $(event.delegateTarget).addClass('focused');
    },
    // load new nodes by ajax
    loadNodes: function (rel, url, $edge) {
      var that = this;
      var opts = this.options;
      $.ajax({ 'url': url, 'dataType': 'json' })
      .done(function (data) {
        if (that.$chart.data('inAjax')) {
          if (rel === 'parent') {
            if (!$.isEmptyObject(data)) {
              that.addParent($edge.parent(), data);
            }
          } else if (rel === 'children') {
            if (data.children.length) {
              that.addChildren($edge.parent(), data[rel]);
            }
          } else {
            that.addSiblings($edge.parent(), data.siblings ? data.siblings : data);
          }
        }
      })
      .fail(function () {
        console.log('Failed to get ' + rel + ' data');
      })
      .always(function () {
        that.endLoading($edge);
      });
    },
    //
    HideFirstParentEnd: function (event) {
      var $topEdge = event.data.topEdge;
      var $node = $topEdge.parent();
      if (this.isInAction($node)) {
        this.switchVerticalArrow($topEdge);
        this.switchHorizontalArrow($node);
      }
    },
    //
    topEdgeClickHandler: function (event) {
      event.stopPropagation();
      var that = this;
      var $topEdge = $(event.target);
      var $node = $(event.delegateTarget);
      var parentState = this.getNodeState($node, 'parent');
      if (parentState.exist) {
        var $parent = $node.closest('table').closest('tr').siblings(':first').find('.node');
        if ($parent.is('.sliding')) { return; }
        // hide the ancestor nodes and sibling nodes of the specified node
        if (parentState.visible) {
          this.hideParent($node);
          $parent.one('transitionend', { 'topEdge': $topEdge }, this.HideFirstParentEnd.bind(this));
        } else { // show the ancestors and siblings
          this.showParent($node);
        }
      } else { // load the new parent node of the specified node by ajax request
        // start up loading status
        if (this.startLoading($topEdge)) {
          var opts = this.options;
          var url = $.isFunction(opts.ajaxURL.parent) ? opts.ajaxURL.parent(event.data.nodeData) : opts.ajaxURL.parent + $node[0].id;
          this.loadNodes('parent', url, $topEdge);
        }
      }
    },
    //
    bottomEdgeClickHandler: function (event) {
      event.stopPropagation();
      var $bottomEdge = $(event.target);
      var $node = $(event.delegateTarget);
      var childrenState = this.getNodeState($node, 'children');
      if (childrenState.exist) {
        var $children = $node.closest('tr').siblings(':last');
        if ($children.find('.sliding').length) { return; }
        // hide the descendant nodes of the specified node
        if (childrenState.visible) {
          this.hideChildren($node);
        } else { // show the descendants
          this.showChildren($node);
        }
      } else { // load the new children nodes of the specified node by ajax request
        if (this.startLoading($bottomEdge)) {
          var opts = this.options;
          var url = $.isFunction(opts.ajaxURL.children) ? opts.ajaxURL.children(event.data.nodeData) : opts.ajaxURL.children + $node[0].id;
          this.loadNodes('children', url, $bottomEdge);
        }
      }
    },
    //
    hEdgeClickHandler: function (event) {
      event.stopPropagation();
      var $hEdge = $(event.target);
      var $node = $(event.delegateTarget);
      var opts = this.options;
      var siblingsState = this.getNodeState($node, 'siblings');
      if (siblingsState.exist) {
        var $siblings = $node.closest('table').parent().siblings();
        if ($siblings.find('.sliding').length) { return; }
        if (opts.toggleSiblingsResp) {
          var $prevSib = $node.closest('table').parent().prev();
          var $nextSib = $node.closest('table').parent().next();
          if ($hEdge.is('.leftEdge')) {
            if ($prevSib.is('.hidden')) {
              this.showSiblings($node, 'left');
            } else {
              this.hideSiblings($node, 'left');
            }
          } else {
            if ($nextSib.is('.hidden')) {
              this.showSiblings($node, 'right');
            } else {
              this.hideSiblings($node, 'right');
            }
          }
        } else {
          if (siblingsState.visible) {
            this.hideSiblings($node);
          } else {
            this.showSiblings($node);
          }
        }
      } else {
        // load the new sibling nodes of the specified node by ajax request
        if (this.startLoading($hEdge)) {
          var nodeId = $node[0].id;
          var url = (this.getNodeState($node, 'parent').exist) ?
            ($.isFunction(opts.ajaxURL.siblings) ? opts.ajaxURL.siblings(event.data.nodeData) : opts.ajaxURL.siblings + nodeId) :
            ($.isFunction(opts.ajaxURL.families) ? opts.ajaxURL.families(event.data.nodeData) : opts.ajaxURL.families + nodeId);
          this.loadNodes('siblings', url, $hEdge);
        }
      }
    },
    //
    expandVNodesEnd: function (event) {
      event.data.vNodes.removeClass('sliding');
    },
    //
    collapseVNodesEnd: function (event) {
      event.data.vNodes.removeClass('sliding').closest('ul').addClass('hidden');
    },
    // event handler for toggle buttons in Hybrid(horizontal + vertical) OrgChart
    toggleVNodes: function (event) {
      var $toggleBtn = $(event.target);
      var $descWrapper = $toggleBtn.parent().next();
      var $descendants = $descWrapper.find('.node');
      var $children = $descWrapper.children().children('.node');
      if ($children.is('.sliding')) { return; }
      $toggleBtn.toggleClass('fa-plus-square fa-minus-square');
      if ($descendants.eq(0).is('.slide-up')) {
        $descWrapper.removeClass('hidden');
        this.repaint($children.get(0));
        $children.addClass('sliding').removeClass('slide-up').eq(0).one('transitionend', { 'vNodes': $children }, this.expandVNodesEnd);
      } else {
        $descendants.addClass('sliding slide-up').eq(0).one('transitionend', { 'vNodes': $descendants }, this.collapseVNodesEnd);
        $descendants.find('.toggleBtn').removeClass('fa-minus-square').addClass('fa-plus-square');
      }
    },
    //
    createGhostNode: function (event) {
      var $nodeDiv = $(event.target);
      var opts = this.options;
      var origEvent = event.originalEvent;
      var isFirefox = /firefox/.test(window.navigator.userAgent.toLowerCase());
      if (isFirefox) {
        origEvent.dataTransfer.setData('text/html', 'hack for firefox');
      }
      var ghostNode, nodeCover;
      if (!document.querySelector('.ghost-node')) {
        ghostNode = document.createElementNS("http://www.w3.org/2000/svg", "svg");
        ghostNode.classList.add('ghost-node');
        nodeCover = document.createElementNS('http://www.w3.org/2000/svg','rect');
        ghostNode.appendChild(nodeCover);
        $nodeDiv.closest('.orgchart').append(ghostNode);
      } else {
        ghostNode = $nodeDiv.closest('.orgchart').children('.ghost-node').get(0);
        nodeCover = $(ghostNode).children().get(0);
      }
      var transValues = $nodeDiv.closest('.orgchart').css('transform').split(',');
      var scale = Math.abs(window.parseFloat((opts.direction === 't2b' || opts.direction === 'b2t') ? transValues[0].slice(transValues[0].indexOf('(') + 1) : transValues[1]));
      ghostNode.setAttribute('width', $nodeDiv.outerWidth(false));
      ghostNode.setAttribute('height', $nodeDiv.outerHeight(false));
      nodeCover.setAttribute('x',5 * scale);
      nodeCover.setAttribute('y',5 * scale);
      nodeCover.setAttribute('width', 120 * scale);
      nodeCover.setAttribute('height', 40 * scale);
      nodeCover.setAttribute('rx', 4 * scale);
      nodeCover.setAttribute('ry', 4 * scale);
      nodeCover.setAttribute('stroke-width', 1 * scale);
      var xOffset = origEvent.offsetX * scale;
      var yOffset = origEvent.offsetY * scale;
      if (opts.direction === 'l2r') {
        xOffset = origEvent.offsetY * scale;
        yOffset = origEvent.offsetX * scale;
      } else if (opts.direction === 'r2l') {
        xOffset = $nodeDiv.outerWidth(false) - origEvent.offsetY * scale;
        yOffset = origEvent.offsetX * scale;
      } else if (opts.direction === 'b2t') {
        xOffset = $nodeDiv.outerWidth(false) - origEvent.offsetX * scale;
        yOffset = $nodeDiv.outerHeight(false) - origEvent.offsetY * scale;
      }
      if (isFirefox) { // hack for old version of Firefox(< 48.0)
        nodeCover.setAttribute('fill', 'rgb(255, 255, 255)');
        nodeCover.setAttribute('stroke', 'rgb(191, 0, 0)');
        var ghostNodeWrapper = document.createElement('img');
        ghostNodeWrapper.src = 'data:image/svg+xml;utf8,' + (new XMLSerializer()).serializeToString(ghostNode);
        origEvent.dataTransfer.setDragImage(ghostNodeWrapper, xOffset, yOffset);
      } else {
        origEvent.dataTransfer.setDragImage(ghostNode, xOffset, yOffset);
      }
    },
    //
    filterAllowedDropNodes: function ($dragged) {
      var opts = this.options;
      var $dragZone = $dragged.closest('.nodes').siblings().eq(0).find('.node:first');
      var $dragHier = $dragged.closest('table').find('.node');
      this.$chart.data('dragged', $dragged)
        .find('.node').each(function (index, node) {
          if ($dragHier.index(node) === -1) {
            if (opts.dropCriteria) {
              if (opts.dropCriteria($dragged, $dragZone, $(node))) {
                $(node).addClass('allowedDrop');
              }
            } else {
              $(node).addClass('allowedDrop');
            }
          }
        });
    },
    //
    dragstartHandler: function (event) {
      // if users enable zoom or direction options
      if (this.$chart.css('transform') !== 'none') {
        this.createGhostNode(event);
      }
      this.filterAllowedDropNodes($(event.target));
    },
    //
    dragoverHandler: function (event) {
      event.preventDefault();
      if (!$(event.delegateTarget).is('.allowedDrop')) {
        event.originalEvent.dataTransfer.dropEffect = 'none';
      }
    },
    //
    dragendHandler: function (event) {
      this.$chart.find('.allowedDrop').removeClass('allowedDrop');
    },
    //
    dropHandler: function (event) {
      var $dropZone = $(event.delegateTarget);
      var $dragged = this.$chart.data('dragged');
      var $dragZone = $dragged.closest('.nodes').siblings().eq(0).children();
      var dropEvent = $.Event('nodedrop.orgchart');
      this.$chart.trigger(dropEvent, { 'draggedNode': $dragged, 'dragZone': $dragZone.children(), 'dropZone': $dropZone });
      if (dropEvent.isDefaultPrevented()) {
        return;
      }
      // firstly, deal with the hierarchy of drop zone
      if (!$dropZone.closest('tr').siblings().length) { // if the drop zone is a leaf node
        $dropZone.append('<i class="edge verticalEdge bottomEdge fa"></i>')
          .parent().attr('colspan', 2)
          .parent().after('<tr class="lines"><td colspan="2"><div class="downLine"></div></td></tr>'
          + '<tr class="lines"><td class="rightLine"></td><td class="leftLine"></td></tr>'
          + '<tr class="nodes"></tr>')
          .siblings(':last').append($dragged.find('.horizontalEdge').remove().end().closest('table').parent());
      } else {
        var dropColspan = parseInt($dropZone.parent().attr('colspan')) + 2;
        var horizontalEdges = '<i class="edge horizontalEdge rightEdge fa"></i><i class="edge horizontalEdge leftEdge fa"></i>';
        $dropZone.closest('tr').next().addBack().children().attr('colspan', dropColspan);
        if (!$dragged.find('.horizontalEdge').length) {
          $dragged.append(horizontalEdges);
        }
        $dropZone.closest('tr').siblings().eq(1).children(':last').before('<td class="leftLine topLine"></td><td class="rightLine topLine"></td>')
          .end().next().append($dragged.closest('table').parent());
        var $dropSibs = $dragged.closest('table').parent().siblings().find('.node:first');
        if ($dropSibs.length === 1) {
          $dropSibs.append(horizontalEdges);
        }
      }
      // secondly, deal with the hierarchy of dragged node
      var dragColspan = parseInt($dragZone.attr('colspan'));
      if (dragColspan > 2) {
        $dragZone.attr('colspan', dragColspan - 2)
          .parent().next().children().attr('colspan', dragColspan - 2)
          .end().next().children().slice(1, 3).remove();
        var $dragSibs = $dragZone.parent().siblings('.nodes').children().find('.node:first');
        if ($dragSibs.length ===1) {
          $dragSibs.find('.horizontalEdge').remove();
        }
      } else {
        $dragZone.removeAttr('colspan')
          .find('.bottomEdge').remove()
          .end().end().siblings().remove();
      }
    },
    //
    touchstartHandler: function (event) {
        console.log("orgChart: touchstart 1: touchHandled=" + this.touchHandled + ", touchMoved=" + this.touchMoved + ", target=" + event.target.innerText);
        if (this.touchHandled)
            return;
        this.touchHandled = true;
        this.touchMoved = false;     // this is so we can work out later if this was a 'press' or a 'drag' touch
        event.preventDefault();
    },
    //
    touchmoveHandler: function (event) {
      if (!this.touchHandled)
        return;
      event.preventDefault();
      if (!this.touchMoved) {
        var nodeIsSelected = $(this).hasClass('focused');
        console.log("orgChart: touchmove 1: " + event.touches.length + " touches, we have not moved, so simulate a drag start", event.touches);
        // TODO: visualise the start of the drag (as would happen on desktop)
        this.simulateMouseEvent(event, 'dragstart');
      }
      this.touchMoved = true;
      var $touching = $(document.elementFromPoint(event.touches[0].clientX, event.touches[0].clientY));
      var $touchingNode = $touching.closest('div.node');
 
      if ($touchingNode.length > 0) {
        var touchingNodeElement = $touchingNode[0];
        // TODO: simulate the dragover visualisation
        if ($touchingNode.is('.allowedDrop')) {
            console.log("orgChart: touchmove 2: this node (" + touchingNodeElement.id + ") is allowed to be a drop target");
            this.touchTargetNode = touchingNodeElement;
        } else {
            console.log("orgChart: touchmove 3: this node (" + touchingNodeElement.id + ") is NOT allowed to be a drop target");
            this.touchTargetNode = null;
        }
      } else {
        console.log("orgchart: touchmove 4: not touching a node");
        this.touchTargetNode = null;
      }
    },
    //
    touchendHandler: function (event) {
      console.log("orgChart: touchend 1: touchHandled=" + this.touchHandled + ", touchMoved=" + this.touchMoved + ", " + event.target.innerText + " ");
      if (!this.touchHandled) {
          console.log("orgChart: touchend 2: not handled by us, so aborting");
          return;
      }
      if (this.touchMoved) {
          // we've had movement, so this was a 'drag' touch
          if (this.touchTargetNode) {
              console.log("orgChart: touchend 3: moved to a node, so simulating drop");
              var fakeEventForDropHandler = { delegateTarget: this.touchTargetNode };
              this.dropHandler(fakeEventForDropHandler);
              this.touchTargetNode = null;
          }
          console.log("orgChart: touchend 4: simulating dragend");
          this.simulateMouseEvent(event, 'dragend');
      }
      else {
          // we did not move, so assume this was a 'press' touch
          console.log("orgChart: touchend 5: moved, so simulating click");
          this.simulateMouseEvent(event, 'click');
      }
      this.touchHandled = false;
    },
    // simulate a mouse event (so we can fake them on a touch device)
    simulateMouseEvent: function (event, simulatedType) {
      // Ignore multi-touch events
      if (event.originalEvent.touches.length > 1) {
        return;
      }
      var touch = event.originalEvent.changedTouches[0];
      var simulatedEvent = document.createEvent('MouseEvents');
      simulatedEvent.initMouseEvent(
        simulatedType,    // type
        true,             // bubbles                    
        true,             // cancelable                 
        window,           // view                       
        1,                // detail                     
        touch.screenX,    // screenX                    
        touch.screenY,    // screenY                    
        touch.clientX,    // clientX                    
        touch.clientY,    // clientY                    
        false,            // ctrlKey                    
        false,            // altKey                     
        false,            // shiftKey                   
        false,            // metaKey                    
        0,                // button                     
        null              // relatedTarget              
      );
      // Dispatch the simulated event to the target element
      event.target.dispatchEvent(simulatedEvent);
    },
    //
    bindDragDrop: function ($node) {
      $node.on('dragstart', this.dragstartHandler.bind(this))
        .on('dragover', this.dragoverHandler.bind(this))
        .on('dragend', this.dragendHandler.bind(this))
        .on('drop', this.dropHandler.bind(this))
        .on('touchstart', this.touchstartHandler.bind(this))
        .on('touchmove', this.touchmoveHandler.bind(this))
        .on('touchend', this.touchendHandler.bind(this));
    },
    // create node
    createNode: function (data) {
      var that = this;
      var opts = this.options;
      var level = data.level;
      if (data.children) {
        $.each(data.children, function (index, child) {
          child.parentId = data.id;
        });
      }
      // construct the content of node
      var $nodeDiv = $('<div' + (opts.draggable ? ' draggable="true"' : '') + (data[opts.nodeId] ? ' id="' + data[opts.nodeId] + '"' : '') + (data.parentId ? ' data-parent="' + data.parentId + '"' : '') + '>')
        .addClass('node ' + (data.className || '') +  (level > opts.visibleLevel ? ' slide-up' : ''));
      if (opts.nodeTemplate) {
        $nodeDiv.append(opts.nodeTemplate(data));
      } else {
        $nodeDiv.append('<div class="title">' + data[opts.nodeTitle] + '</div>')
          .append(typeof opts.nodeContent !== 'undefined' ? '<div class="content">' + (data[opts.nodeContent] || '') + '</div>' : '');
      }
      // append 4 direction arrows or expand/collapse buttons
      var flags = data.relationship || '';
      if (opts.verticalLevel && level >= opts.verticalLevel) {
        if ((level + 1) > opts.verticalLevel && Number(flags.substr(2,1))) {
          var icon = level + 1 > opts.visibleLevel ? 'plus' : 'minus';
          $nodeDiv.append('<i class="toggleBtn fa fa-' + icon + '-square"></i>');
        }
      } else {
        if (Number(flags.substr(0,1))) {
          $nodeDiv.append('<i class="edge verticalEdge topEdge fa"></i>');
        }
        if(Number(flags.substr(1,1))) {
          $nodeDiv.append('<i class="edge horizontalEdge rightEdge fa"></i>' +
            '<i class="edge horizontalEdge leftEdge fa"></i>');
        }
        if(Number(flags.substr(2,1))) {
          $nodeDiv.append('<i class="edge verticalEdge bottomEdge fa"></i>')
            .children('.title').prepend('<i class="fa '+ opts.parentNodeSymbol + ' symbol"></i>');
        }
      }

      $nodeDiv.on('mouseenter mouseleave', this.nodeEnterLeaveHandler.bind(this));
      $nodeDiv.on('click', this.nodeClickHandler.bind(this));
      $nodeDiv.on('click', '.topEdge', { 'nodeData': data }, this.topEdgeClickHandler.bind(this));
      $nodeDiv.on('click', '.bottomEdge', { 'nodeData': data }, this.bottomEdgeClickHandler.bind(this));
      $nodeDiv.on('click', '.leftEdge, .rightEdge', { 'nodeData': data }, this.hEdgeClickHandler.bind(this));
      $nodeDiv.on('click', '.toggleBtn', this.toggleVNodes.bind(this));

      if (opts.draggable) {
        this.bindDragDrop($nodeDiv);
        this.touchHandled = false;
        this.touchMoved = false;
        this.touchTargetNode = null;
      }
      // allow user to append dom modification after finishing node create of orgchart
      if (opts.createNode) {
        opts.createNode($nodeDiv, data);
      }

      return $nodeDiv;
    },
    // recursively build the tree
    buildHierarchy: function ($appendTo, data) {
      var that = this;
      var opts = this.options;
      var level = 0;
      if (data.level) {
        level = data.level;
      } else {
        level = data.level = $appendTo.parentsUntil('.orgchart', '.nodes').length + 1;
      }
      // Construct the node
      var childrenData = data.children;
      var hasChildren = childrenData ? childrenData.length : false;
      var $nodeWrapper;
      if (Object.keys(data).length > 2) {
        var $nodeDiv = this.createNode(data);
        if (opts.verticalLevel && level >= opts.verticalLevel) {
          $appendTo.append($nodeDiv);
        }else {
          $nodeWrapper = $('<table>');
          $appendTo.append($nodeWrapper.append($('<tr/>').append($('<td' + (hasChildren ? ' colspan="' + childrenData.length * 2 + '"' : '') + '></td>').append($nodeDiv))));
        }
      }
      // Construct the lower level(two "connectiong lines" rows and "inferior nodes" row)
      if (hasChildren) {
        var isHidden = (level + 1 > opts.visibleLevel || data.collapsed) ? ' hidden' : '';
        var isVerticalLayer = (opts.verticalLevel && (level + 1) >= opts.verticalLevel) ? true : false;
        var $nodesLayer;
        if (isVerticalLayer) {
          $nodesLayer = $('<ul>');
          if (isHidden && level + 1 > opts.verticalLevel) {
            $nodesLayer.addClass(isHidden);
          }
          if (level + 1 === opts.verticalLevel) {
            $appendTo.children('table').append('<tr class="verticalNodes' + isHidden + '"><td></td></tr>')
              .find('.verticalNodes').children().append($nodesLayer);
          } else {
            $appendTo.append($nodesLayer);
          }
        } else {
          var $upperLines = $('<tr class="lines' + isHidden + '"><td colspan="' + childrenData.length * 2 + '"><div class="downLine"></div></td></tr>');
          var lowerLines = '<tr class="lines' + isHidden + '"><td class="rightLine"></td>';
          for (var i=1; i<childrenData.length; i++) {
            lowerLines += '<td class="leftLine topLine"></td><td class="rightLine topLine"></td>';
          }
          lowerLines += '<td class="leftLine"></td></tr>';
          $nodesLayer = $('<tr class="nodes' + isHidden + '">');
          if (Object.keys(data).length === 2) {
            $appendTo.append($upperLines).append(lowerLines).append($nodesLayer);
          } else {
            $nodeWrapper.append($upperLines).append(lowerLines).append($nodesLayer);
          }
        }
        // recurse through children nodes
        $.each(childrenData, function () {
          var $nodeCell = isVerticalLayer ? $('<li>') : $('<td colspan="2">');
          $nodesLayer.append($nodeCell);
          this.level = level + 1;
          that.buildHierarchy($nodeCell, this);
        });
      }
    },
    // build the child nodes of specific node
    buildChildNode: function ($appendTo, data) {
      $appendTo.find('td:first').attr('colspan', data.length * 2);
      this.buildHierarchy($appendTo, { 'children': data });
    },
    // exposed method
    addChildren: function ($node, data) {
      this.buildChildNode($node.closest('table'), data);
      if (!$node.children('.bottomEdge').length) {
        $node.append('<i class="edge verticalEdge bottomEdge fa"></i>');
      }
      if (!$node.find('.symbol').length) {
        $node.children('.title').prepend('<i class="fa '+ this.options.parentNodeSymbol + ' symbol"></i>');
      }
      if (this.isInAction($node)) {
        this.switchVerticalArrow($node.children('.bottomEdge'));
      }
    },
    // build the parent node of specific node
    buildParentNode: function ($currentRoot, data) {
      data.relationship = data.relationship || '001';
      var $table = $('<table>')
        .append($('<tr>').append($('<td colspan="2">').append(this.createNode(data))))
        .append('<tr class="lines"><td colspan="2"><div class="downLine"></div></td></tr>')
        .append('<tr class="lines"><td class="rightLine"></td><td class="leftLine"></td></tr>');
      this.$chart.prepend($table)
        .children('table:first').append('<tr class="nodes"><td colspan="2"></td></tr>')
        .children('tr:last').children().append(this.$chart.children('table').last());
    },
    // exposed method
    addParent: function ($currentRoot, data) {
      this.buildParentNode($currentRoot, data);
      if (!$currentRoot.children('.topEdge').length) {
        $currentRoot.children('.title').after('<i class="edge verticalEdge topEdge fa"></i>');
      }
      if (this.isInAction($currentRoot)) {
        this.switchVerticalArrow($currentRoot.children('.topEdge'));
      }
    },
    // subsequent processing of build sibling nodes
    complementLine: function ($oneSibling, siblingCount, existingSibligCount) {
      var lines = '';
      for (var i = 0; i < existingSibligCount; i++) {
        lines += '<td class="leftLine topLine"></td><td class="rightLine topLine"></td>';
      }
      $oneSibling.parent().prevAll('tr:gt(0)').children().attr('colspan', siblingCount * 2)
        .end().next().children(':first').after(lines);
    },
    // build the sibling nodes of specific node
    buildSiblingNode: function ($nodeChart, data) {
      var newSiblingCount = $.isArray(data) ? data.length : data.children.length;
      var existingSibligCount = $nodeChart.parent().is('td') ? $nodeChart.closest('tr').children().length : 1;
      var siblingCount = existingSibligCount + newSiblingCount;
      var insertPostion = (siblingCount > 1) ? Math.floor(siblingCount/2 - 1) : 0;
      // just build the sibling nodes for the specific node
      if ($nodeChart.parent().is('td')) {
        var $parent = $nodeChart.closest('tr').prevAll('tr:last');
        $nodeChart.closest('tr').prevAll('tr:lt(2)').remove();
        this.buildChildNode($nodeChart.parent().closest('table'), data);
        var $siblingTds = $nodeChart.parent().closest('table').children('tr:last').children('td');
        if (existingSibligCount > 1) {
          this.complementLine($siblingTds.eq(0).before($nodeChart.closest('td').siblings().addBack().unwrap()), siblingCount, existingSibligCount);
        } else {
          this.complementLine($siblingTds.eq(insertPostion).after($nodeChart.closest('td').unwrap()), siblingCount, 1);
        }
      } else { // build the sibling nodes and parent node for the specific ndoe
        this.buildHierarchy($nodeChart.closest('.orgchart'), data);
        this.complementLine($nodeChart.next().children('tr:last').children().eq(insertPostion).after($('<td colspan="2">').append($nodeChart)),
          siblingCount, 1);
      }
    },
    //
    addSiblings: function ($node, data) {
      this.buildSiblingNode($node.closest('table'), data);
      $node.closest('.nodes').data('siblingsLoaded', true);
      if (!$node.children('.leftEdge').length) {
        $node.children('.topEdge').after('<i class="edge horizontalEdge rightEdge fa"></i><i class="edge horizontalEdge leftEdge fa"></i>');
      }
      if (this.isInAction($node)) {
        this.switchHorizontalArrow($node);
        $node.children('.topEdge').removeClass('fa-chevron-up').addClass('fa-chevron-down');
      }
    },
    //
    removeNodes: function ($node) {
      var $parent = $node.closest('table').parent();
      var $sibs = $parent.parent().siblings();
      if ($parent.is('td')) {
        if (this.getNodeState($node, 'siblings').exist) {
          $sibs.eq(2).children('.topLine:lt(2)').remove();
          $sibs.slice(0, 2).children().attr('colspan', $sibs.eq(2).children().length);
          $parent.remove();
        } else {
          $sibs.eq(0).children().removeAttr('colspan')
            .find('.bottomEdge').remove()
            .end().end().siblings().remove();
        }
      } else {
        $parent.add($parent.siblings()).remove();
      }
    },
    //
    export: function (exportFilename, exportFileextension) {
      var that = this;
      exportFilename = (typeof exportFilename !== 'undefined') ?  exportFilename : this.options.exportFilename;
      exportFileextension = (typeof exportFileextension !== 'undefined') ?  exportFileextension : this.options.exportFileextension;
      if ($(this).children('.spinner').length) {
        return false;
      }
      var $chartContainer = this.$chartContainer;
      var $mask = $chartContainer.find('.mask');
      if (!$mask.length) {
        $chartContainer.append('<div class="mask"><i class="fa fa-circle-o-notch fa-spin spinner"></i></div>');
      } else {
        $mask.removeClass('hidden');
      }
      var sourceChart = $chartContainer.addClass('canvasContainer').find('.orgchart:not(".hidden")').get(0);
      var flag = that.options.direction === 'l2r' || that.options.direction === 'r2l';
      html2canvas(sourceChart, {
        'width': flag ? sourceChart.clientHeight : sourceChart.clientWidth,
        'height': flag ? sourceChart.clientWidth : sourceChart.clientHeight,
        'onclone': function (cloneDoc) {
          $(cloneDoc).find('.canvasContainer').css('overflow', 'visible')
            .find('.orgchart:not(".hidden"):first').css('transform', '');
        },
        'onrendered': function (canvas) {
          $chartContainer.find('.mask').addClass('hidden');
          if (exportFileextension.toLowerCase() === 'pdf') {
            var doc = {};
            var docWidth = Math.floor(canvas.width * 0.2646);
            var docHeight = Math.floor(canvas.height * 0.2646);
            if (docWidth > docHeight) {
              doc = new jsPDF('l', 'mm', [docWidth, docHeight]);
            } else {
              doc = new jsPDF('p', 'mm', [docHeight, docWidth]);
            }
            doc.addImage(canvas.toDataURL(), 'png', 0, 0);
            doc.save(exportFilename + '.pdf');
          } else {
            var isWebkit = 'WebkitAppearance' in document.documentElement.style;
            var isFf = !!window.sidebar;
            var isEdge = navigator.appName === 'Microsoft Internet Explorer' || (navigator.appName === "Netscape" && navigator.appVersion.indexOf('Edge') > -1);

            if ((!isWebkit && !isFf) || isEdge) {
              window.navigator.msSaveBlob(canvas.msToBlob(), exportFilename + '.png');
            } else {
              var selector = '.oc-download-btn' + (that.options.chartClass !== '' ? '.' + that.options.chartClass : '');
              if (!$chartContainer.find(selector).length) {
                $chartContainer.append('<a class="oc-download-btn' + (that.options.chartClass !== '' ? ' ' + that.options.chartClass : '') + '"'
                  + ' download="' + exportFilename + '.png"></a>');
              }
              $chartContainer.find(selector).attr('href', canvas.toDataURL())[0].click();
            }
          }
        }
      })
      .then(function () {
        $chartContainer.removeClass('canvasContainer');
      }, function () {
        $chartContainer.removeClass('canvasContainer');
      });
    }
  };

  $.fn.orgchart = function (opts) {
    return new OrgChart(this, opts).init();
  };

}));