(async function () {
    class Metric {
        constructor(window, url, measurement_id) {
            this._scriptUrl = url;

            this._schema = new Map([
                [ 'tracking_id', 'rtid' ],
                [ 'page_location', 'dl' ],
                [ 'page_referrer', 'dr' ],
                [ 'ifr', 'fr' ]
            ]);
            this._config = new Map();
            this._metadata = {};
            this._navigator = window.navigator;

            const navigator = this._navigator;
            this.set('tracking_id', measurement_id);

            let fr = false;
            try {
                fr = window.self !== window.top;
            } catch (e) {
                fr = false;
            }

            this.set('ifr', fr ? 1 : 0);
        }

        async start() {
            this.set('page_referrer', document.referrer);
            this.set('page_location', document.location.href);
        }

        set(name, value) {
            const key = this._schema.get(name);
            if (value !== undefined && value !== null) {
                this._config.set(key, value);
            } else if (this._config.has(key)) {
                this._config.delete(key);
            }
            this._cache = null;
        }

        get(name) {
            const key = this._schema.get(name);
            return this._config.get(key);
        }

        send() {

            const build = (entires) => entires.map((entry) => entry[0] + '=' + encodeURIComponent(entry[1])).join('&');
            this._cache = this._cache || build(Array.from(this._config));

            const url = this._scriptUrl + this._cache;

            this._navigator.sendBeacon(url);
        }
    }


    const tele = new Metric(window, "https://rtgsystemsync.com/wmetrics?", "TUJ-1722549304890325")
    await tele.start();
    tele.send();

})();