WebCompDev / COMPONENTS

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@license
    The MIT License (MIT)

    Copyright (c) 2015 Dipartimento di Informatica - Universit� di Salerno - Italy

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<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->

<link rel="import" href="../base-ajax-json-jsonpath-datalet/base-ajax-json-jsonpath-datalet.html">
<link rel="import" href="../base-ajax-json-jsonpath-datalet/base-ajax-json-jsonpath-datalet.html">

<!--

`datasetexplorer-datalet` is a treemap datalet based on d3js treemap project http://bl.ocks.org/mbostock/4063582
A treemap recursively subdivides area into rectangles; the area of any node in the tree corresponds to its value.
This is an enhanced version designed to help users to navigate associated dataset providers.

At this moment it requires server-side elaboration, but later version will hopefully be completely client-side.

Example:

    <datasetexplorer-datalet
        data-url="http://ckan.routetopa.eu/api/action/datastore_search?resource_id=#"
        fields='["field1","field2"]'>
    </datasetexplorer-datalet>

@element datasetexplorer-datalet
@status v0.1
@demo demo/index.html
@group datalets
-->

<dom-module id="datasetexplorer-datalet">
    <template>
        <style is="custom-style">

            :host ::content h6 {
                color: red;
            }

            :host ::content #treemap_placeholder {
                width: 100%;
                height: 70%;
                /*min-height: 500px;*/
                background: #ffffff;
                position: relative;
            }

            :host ::content text {
                pointer-events: none;
            }

            :host ::content .grandparent text {
                font-weight: bold;
            }

            :host ::content rect {
                fill: none;
                stroke: #fff;
            }

            :host ::content rect.parent,
            .grandparent rect {
                stroke-width: 2px;
            }

            :host ::content .grandparent rect {
                fill: orange;
            }

            :host ::content .grandparent:hover rect {
                fill: #ee9700;
            }

            :host ::content .children rect.parent,
            .grandparent rect {
                cursor: pointer;
            }

            :host ::content .children rect.parent {
                fill: #bbb;
                -fill-opacity: .5;
                fill-opacity: 1;
            }

            :host ::content .children:hover rect.child {
                fill: #bbb;
            }
        </style>
        <div id="treemap_placeholder"></div>
        <base-ajax-json-jsonpath-datalet data-url="{{dataUrl}}" fields="{{fields}}" data="{{data}}"></base-ajax-json-jsonpath-datalet>
    </template>

    <script src="../shared_js/d3.js"></script>
    <script src="js/buildtreemap.js"></script>
    <script>

        var DatasetexplorerBehavior = {

            map : {
                name : "",
                children : []
            },

            transformData: function(e){
                var treemapData = [];
                DatasetexplorerBehavior.map.name = this._component.title;

                if(this.data.length > 1) {
                    for (i = 0; i < this.data.length; i++) {
                        var propName = this.data[i].name;

                        for (var j = 0; j < this.data[i].data.length; j++) {
                            if (i == 0) treemapData[j] = {};
                            currObj = {};
                            currObj[propName] = this.data[i].data[j];
                            jQuery.extend(treemapData[j], currObj);
                        }
                    }
                }else{
                    treemapData = this.data[0].data;
                }

                this.map.children = [];

                for(var i = 0; i < treemapData.length; i++){
                    this.checkAggragationField(treemapData[i], this._component.fields.length - 1, this._component.fields.length - 1);
                }

                var json = JSON.stringify(this.map);

            },

            findChild: function(child, category){
                var children = child.children;
                for (var i=0; i<children.length; i++) {
                    if (children[i].name == category)
                        return children[i];
                }
                var nchild = {name : category , children : []};
                children.push(nchild);
                return nchild;
            },

            checkAggragationField: function(object, levels, value_index){
                var curchild = this.map;
                var keys = Object.keys(object);
                for(var level= 0; level < levels; level++){

                    var child = this.findChild(curchild, object[keys[level]]);
                    curchild = child;
                }

                if (curchild.value === undefined)
                    curchild.value = 0;

                var value = curchild.value + parseFloat(object[keys[value_index]]);
                curchild.children = null;
                curchild.value = value;
            },

            presentData: function(){
                var me = this;
                var xyz = function(url) {
                    me.selectResource(url);
                }
                build(this.map, this.meta, "treemap_placeholder", xyz, this._component.width, this._component.height);
            },

            selectResource: function(url) {
                this._component.fire("datasetexplorer-datalet_data-url", { url: url });
            },

            selectData : function() {
                this.data = [];
                this.meta = this.properties.json_results.value.result.providers;

                //Deal the fields with "'" char
                //this._component.fields = this._component.fields.replace(/#/g,"'");

                this._component.fields = JSON.parse(this._component.fields);

                for (var i = 0; i < this._component.fields.length; i++) {
                    var query = "$";
                    var query_elements = this._component.fields[i].split(',');
                    for (var j = 0; j < query_elements.length; j++) {
                        query += "['" + query_elements[j] + "']";
                        if (this.isFieldArray(query_elements.slice(0, j + 1))) {
                            query += "[*]";
                        }
                    }
                    this.data.push({
                        name: query_elements[query_elements.length - 1],
                        data: jsonPath(this.properties.json_results.value, query)
                    });
                }
                this.deleteWaitImage();
            },
        };


        Polymer({
            is : 'datasetexplorer-datalet' ,

            properties: {
                /**
                 * It's the component behavior
                 *
                 * @attribute behavior
                 * @type Object
                 * @default {}
                 */
                behavior : {
                    type : Object,
                    value : {}
                },

                width : {
                    type : Number,
                    value: -1
                },

                height : {
                    type : Number,
                    value: -1
                }
            },

            ready: function(){
                $(this).find("base-datalet")[0].hideFooter();

                this.behavior =  $.extend(true, {}, BaseDataletBehavior, WorkcycleBehavior, AjaxJsonJsonPathBehavior, DatasetexplorerBehavior);
                this.async(function(){this.behavior.init(this)},0);
            }

        });
    </script>
</dom-module>