var ERoiSessionTracker = {
                dataLayerEventsList : ['Modal-Energia'],
                params : {
        id_offer: 274
    },
    last_params : {},
    track : function(){
        // skip duplicate request
        const last_params_key=Object.keys(this.last_params);
        const params_key=Object.keys(this.params);

        if(last_params_key.length===params_key.length){
            var count_equal=0;
            for(key of last_params_key){
                if(typeof this.params[key]!=='undefined' && this.last_params[key]===this.params[key]) count_equal++;
                else break;
            }
            if(count_equal===last_params_key.length) return;
        }

        var http = new XMLHttpRequest();
                        var url = 'https://crm.convengo.it/sessionTracker/track';
                        http.open('POST', url, true);

        http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

        http.onreadystatechange = _=>{ //Call a function when the state changes.
            if(http.readyState == 4 && http.status == 200) {
                var response=JSON.parse(http.responseText);
                if(response.status=='success' && typeof response.id !== 'undefined' && (typeof this.params['id'] === 'undefined' || this.params['id']!=response.id)){
                    this.setCookie("ERoiST", response.id, 3);
                    this.params['id']=response.id;
                }

                if(response.status=='success' && typeof response.lead!== 'undefined'){
                    if(response.lead) this.setCookie("ERoiLead", true, 3);
                    //else TODO cancellare lead
                }
            }
        }

        var url_params=Object.keys(this.params).map(key=>{
            return key + '=' + this.params[key];
        }).join('&');
        http.send(url_params);

        this.last_params={...this.params};
    },

    getParams : function(){
        return this.params;
    },

    init : function(dataLayerEvent){
        if(typeof this.params.id_offer === 'undefined') return false;

        var id_session = this.getCookie("ERoiST");
        if (id_session) this.params['id']=id_session;

        
                                         
        
        // try getting params from url, if not provided
        if(typeof this.params['id_supplier_source'] === 'undefined'){
            var id_supplier_source=this.getQueryParam('id_supplier_source');
            if(id_supplier_source){
                this.params['id_supplier_source']=id_supplier_source;

                var supplier_click_id=this.getQueryParam('supplier_click_id');
                if(supplier_click_id) this.params['supplier_click_id']=supplier_click_id;

            }else{
                if(typeof this.params['id_supplier'] === 'undefined' && typeof this.params['supplier_source_text'] === 'undefined'){
                    var id_supplier=this.getQueryParam('id_supplier');
                    var supplier_source_text=this.getQueryParam('supplier_source_text');
                    if(id_supplier && supplier_source_text){
                        this.params['id_supplier']=id_supplier;
                        this.params['supplier_source_text']=supplier_source_text;

                        var supplier_click_id=this.getQueryParam('supplier_click_id');
                        if(supplier_click_id) this.params['supplier_click_id']=supplier_click_id;
                    }else{
                        if(typeof this.params['id_user_source'] === 'undefined'){
                            var id_user_source=this.getQueryParam('id_user_source');
                            if(id_user_source) this.params['id_user_source']=id_user_source;
                        }
                    }
                }
            }
        }
        if(typeof this.params['tracking_platform'] === 'undefined'){
            var tracking_platform=this.getQueryParam('tracking_platform');
            if(tracking_platform) this.params['tracking_platform']=tracking_platform;
        }
        if(typeof this.params['var1'] === 'undefined'){
            var var1=this.getQueryParam('var1');
            if(var1) this.params['var1']=var1;
        }
        if(typeof this.params['var2'] === 'undefined'){
            var var2=this.getQueryParam('var2');
            if(var2) this.params['var2']=var2;
        }
        if(typeof this.params['var3'] === 'undefined'){
            var var3=this.getQueryParam('var3');
            if(var3) this.params['var3']=var3;
        }
        if(typeof this.params['fbclid'] === 'undefined'){
            var fbclid=this.getQueryParam('fbclid');
            if(fbclid) this.params['supplier_click_id']=fbclid;
        }

        if(typeof document.referer !== 'undefined' &&  document.referer!='') this.params['referer']=document.referer;

        //datalayer
        if(typeof dataLayer !== 'undefined'){
            for(dl of dataLayer){
                var extraParams=this.checkDataLayer(dl);
                if(extraParams) this.params=Object.assign(this.params, extraParams);
            }

            if(dataLayerEvent){
                var extraParams=this.checkDataLayer(dataLayerEvent);
                if(extraParams) this.params=Object.assign(this.params, extraParams);
            }
        }

                        if (['loaded','interactive','complete'].includes(document.readyState)) this.track();
                    },

    checkDataLayer(event){
        if(event.constructor.name!='Object') return false;

        // Carmaster dataLayer dsata
        var extraParams={};
        if(typeof event.order !== 'undefined') extraParams['id_order']=event.order && event.order.id_order ? event.order.id_order : false;
        if(typeof event.user !== 'undefined') extraParams['id_user']=event.user && event.user.id_user ? event.user.id_user : false;

        if(typeof event.event !== 'undefined' && this.dataLayerEventsList.includes(event.event)) extraParams['event']=event.event;

        if(Object.keys(extraParams).length>0) return extraParams;
        else return false;
    },

    setCookie : function(cname, cvalue, exdays) {
        var d = new Date();
        d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
        var expires = "expires="+d.toUTCString();
        document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
    },


    getCookie : function(cname) {
        var name = cname + "=";
        var ca = document.cookie.split(';');
        for(var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1);
            }
            if (c.indexOf(name) == 0) {
                return c.substring(name.length, c.length);
            }
        }
        return false;
    },

    getQueryParam : function(name) {
        url = window.location.href;
        name = name.replace(/[\[\]]/g, '\\$&');
        var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
            results = regex.exec(url);
        if (!results) return null;
        if (!results[2]) return '';
        return decodeURIComponent(results[2].replace(/\+/g, ' '));
    }
}

// event handlers
if (document.readyState === "loaded") document.addEventListener("DOMContentLoaded", _ => ERoiSessionTracker.init() );
else ERoiSessionTracker.init();

window.addEventListener('datalayerpush', e => {
    ERoiSessionTracker.init(e.detail)
});