<link rel="import" href="../../bower_components/polymer/polymer.html" />

<link rel="import" href="../../bower_components/iron-collapse/iron-collapse.html">
<link rel="import" href="../../bower_components/paper-menu/paper-menu.html">
<link rel="import" href="../../bower_components/paper-menu/paper-submenu.html">
<link rel="import" href="../../bower_components/paper-item/paper-item.html">

<dom-module id="tree-view-controllet">

    <style is="custom-style">

        --paper-item {
        }

        paper-item {
            cursor: pointer;
        }

        paper-item.menu-trigger {
            font-weight: 700;
        }

        paper-item.menu-trigger.iron-selected {
            background-color: #B6B6B6;
        }

        paper-item:not(.menu-trigger).iron-selected {
            background-color: #2196F3;
            color: #FFFFFF;
        }

        .sublist {
            padding-left: 20px;
            padding-right: 20px;
        }

        :host{
            --paper-menu-focused-item-after: {
                opacity: 0;
            };
        }
    </style>

    <template>

        <paper-menu id="paper_tree"></paper-menu>

    </template>

    <script>
        Polymer({

            is : 'tree-view-controllet',

            properties : {

                rootName : {
                    type  : String,
                    value : "root"
                },

                jsonData : {
                    type  : Object,
                    value : undefined
                },

                selectedFields : {
                    type  : Array,
                    value : []
                },

                preselectedFields : {
                    type : Array,
                    value : []
                },

                openedPath : {
                    type : String,
                    value : undefined
                }

            },

            listeners: {
                'iron-select': '_onSelect',
                'iron-deselect': '_onDeselect'
            },

            ready : function() {
                if(this.jsonData)
                    this._init();
            },

            getFields : function() {
                return this.selectedFields;
            },

            getFlatFields : function() {
                var fields = [];

                for(var A in this.selectedFields)
                    for(var e in this.selectedFields[A])
                        fields.push(this.selectedFields[A][e]);

                return fields;
            },

            _init : function() {
                this._injectBoundHTML(this._initCreateTree(this.rootName, this.jsonData), this.$.paper_tree);
                this._preselectFields();
                this._openPath();
            },

            _injectBoundHTML : function(html, element) {
                var template = document.createElement('template');
                template.innerHTML = html;
                var fragment = this.instanceTemplate(template);
                if (element) {
                    element.textContent = '';
                    element.appendChild(fragment);
                }
                return fragment;
            },

            _initCreateTree : function(nodeName, node) {
                var list  = new Array();
                for(var child in node)
                    list.push(this._createTree(child, node[child]));
                return this._paper_submenu(nodeName, list);
            },

            _createTree : function(nodeName, node) {
                var html = "";
                if(node.constructor == Object){
                    var list  = new Array();
                    for(var child in node)
                        list.push(this._createTree(nodeName+","+child, node[child]));
                    html = this._paper_submenu(nodeName, list);
                }
                else if (node.constructor == Array){
                    var list  = new Array();
                    if(node[0].constructor == Object){
                        for(var child in node[0])
                            list.push(this._createTree(nodeName+","+child, node[0][child]));
                        html = this._paper_submenu(nodeName, list);
                    }
                    else{
                        html = nodeName;
                    }
                }
                else{
                    html = nodeName;
                }
                return html;
            },

            _paper_submenu : function(str, list) {
                var submenu = "<paper-submenu>";

                submenu += "<paper-item class=\"menu-trigger\">"+this._getName(str)+"</paper-item>" + "<paper-menu id=\""+str+"\" class=\"menu-content sublist\" multi>";

                for(var i in list){
                    if(list[i].indexOf("paper-submenu") != -1)
                        submenu += list[i];
                    else
                        submenu += this._paper_item(list[i]);
                }

                submenu += "</paper-menu>" + "</paper-submenu>";

                return submenu;
            },

            _paper_item : function(str){
                return "<paper-item id=\""+str+"\">"+this._getName(str)+"</paper-item>";
            },

            _getName : function (str){
                str = str.split(",");
                return str[str.length-1];
            },

            _preselectFields : function() {
                if (this.preselectedFields){
                    for(var field in this.preselectedFields){
                        var path = this.preselectedFields[field];

                        if (path.lastIndexOf(",") != -1)
                            path = path.substring(0, path.lastIndexOf(","));
                        else
                            path = this.rootName;

                        var menu = document.getElementById(path);
                        var item = document.getElementById(this.preselectedFields[field]);
                        var index = menu.items.indexOf(item);

                        if (menu.selectedValues == undefined){
                            menu.selectedValues = [index];
                        }
                        else{
                            var selectedValues = [];
                            for (var i in menu.selectedValues)
                                selectedValues.push(menu.selectedValues[i]);
                            selectedValues.push(index);
                            menu.selectedValues = selectedValues;
                        }
                    }
                }
            },

            _openPath : function() {
                this.$.paper_tree.firstChild.open();

                if (this.openedPath) {
                    var openedPath = this.openedPath;
                    var nodes = openedPath.split(",");
                    openedPath = "";

                    while (nodes.length != 0) {
                        openedPath += nodes.splice(0, 1);

                        var menu = document.getElementById(openedPath);
                        var submenu = menu.parentNode.parentNode;
                        submenu.open();

                        openedPath += ",";
                    }
                }
            },

            _onSelect : function(e) {
                this._updateSelectedFields(e);
            },

            _onDeselect : function(e) {
                this._updateSelectedFields(e);
            },

            _updateSelectedFields : function(e) {
                var menuId = e.target.id;
                var selectedIds = [];

                var selectedItems = (e.target).selectedItems;
                for(var item in selectedItems){
                    var id = selectedItems[item].id;
                    if(id != "")//submenu
                        selectedIds.push(id);
                }

                if(selectedIds.length)
                    this.selectedFields[menuId] = selectedIds;
                else
                    delete this.selectedFields[menuId];

                this.fire('tree-view-controllet_selected-fields', {fields : this.getFlatFields()});
            }

        });

    </script>

</dom-module>