SGH / COMPONENTS

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  @license
      The MIT License (MIT)
  
      Copyright (c) 2015 Dipartimento di Informatica - Universit� di Salerno - Italy
  
      Permission is hereby granted, free of charge, to any person obtaining a copy
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  <!--
  * Developed by :
  * ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
  *
  -->
  <link rel="import" href="../../bower_components/polymer/polymer.html">
  
  <link rel="import" href="../base-ajax-json-jsonpath-datalet/base-ajax-json-jsonpath-datalet.html">
  
  <link rel="import" href="../../bower_components/google-chart/google-chart.html"/>
  
  <dom-module id="google_piechart-datalet">
  
      <template>
  
          <style is="custom-style">
              #google_piechart{
                  height: 100%;
                  width: 100%;
              }
          </style>
  
          <google-chart
                  id='google_piechart'
                  type='pie'
                  cols={{cols}}
                  rows={{rows}}
                  options={{options}}>
          </google-chart>
  
          <base-ajax-json-jsonpath-datalet data-url="{{dataUrl}}" fields="{{fields}}" data="{{data}}"></base-ajax-json-jsonpath-datalet>
  
      </template>
  
      <script>
  
          var GooglePiechartBehavior = {
  
              presentData : function(){

                  if(!this._dataIsValid())
                      return;

                  var cols = [{"label": this.data[0].name, "type": typeof this.data[0].data[0]}, {"label": this.data[1].name, "type": typeof this.data[1].data[0]}];

                  var rows = [];
                  for(var i=0; i<this.data[0].data.length; i++)
                  {
                      var row = [this.data[0].data[i], this.data[1].data[i]];
                      rows.push(row);
                  }
  

                  this._updateOptions();

  
                  this._component.cols = cols;
                  this._component.rows = rows;

              },
  
              _updateOptions : function(){

                  if(!this._dataIsValid())
                      return;
  
                  var options = this._component.options;
  
                  options["title"] = this._component._title;
                  options["pieHole"] = this._component.pieHole;
                  options["is3D"] = this._component.is3D;
  

                  this._component.options = options;
                  this._component.$.google_piechart.drawChart();

              },
  
              _dataIsValid : function(){
                  if(!this.data[0] || !this.data[1] || typeof this.data[1].data[0] != "number")
                      return false;
                  return true;

              }
  
          };
  
  
          PiechartDatalet = Polymer({
              is: 'google_piechart-datalet',
  
              properties: {
  
                  behavior : {
                      type : Object,
                      value : undefined
                  },
  
                  //inputs
  
                  cols: {
                      type: Array,
                      value:undefined
                  },
  
                  rows: {
                      type: Array,
                      value: undefined
                  },
  
                  //options
  
                  options: {
                      type: Object,

                      value: {"sliceVisibilityThreshold": .03}

                  },
  
                  _title: {//_?
                      type: String,
                      value: ""
                  },
  
                  is3D: {
                      type: Boolean,
                      value: false
                  },
  
                  pieHole: {
                      type: Number,
                      value: 0

                  }

              },
  
              observers: [
                  '_updateOptions(_title, is3D, pieHole)'
              ],
  
              ready : function(){
                  this.behavior =  $.extend(true, {}, BaseDataletBehavior, WorkcycleBehavior, AjaxJsonJsonPathBehavior, GooglePiechartBehavior);
                  this.async(function(){this.behavior.init(this)}, 0);
              },
  
              _updateOptions : function(){
  //                this.async(function(){this.behavior._updateOptions()}, 1000);
                  if(this.behavior)//false on ready
                      this.behavior._updateOptions();
              }
  
          });
  
      </script>
  
  </dom-module>