export let instance: any;

/* eslint-disable */
function inject() {
    const intercomSettings = {};
    (function() {
        let w: any = window;
        let ic: any = w.Intercom;
        if (typeof ic === 'function') {
            ic('reattach_activator');
            ic('update', intercomSettings);
        } else {
            let d = document;
            let i = function() {
                (i as any).c(arguments);
            };
            (i as any).q = [];
            (i as any).c = function(args: any) {
                (i as any).q.push(args);
            };
            w.Intercom = i;
            instance = i;

            // @ts-ignore
            function l() {
                let s = d.createElement('script');
                s.type = 'text/javascript';
                s.async = true;
                s.src = `https://widget.intercom.io/widget/${process.env.INTERCOM_ID}`;
                let x = d.getElementsByTagName('script')[0];
                x.parentNode.insertBefore(s, x);
            }

            if (w.attachEvent) {
                w.attachEvent('onload', l);
            } else {
                w.addEventListener('load', l, false);
            }
        }
    })();
}

/* tslint:enable */

export function getInstance(): any {
    if (typeof instance === 'function') {
        return instance;
    }
    return null;
}

export function initialize(): void {
    if (!process.env.INTERCOM_ID) {
        return;
    }
    inject();
    const Intercom = getInstance();
    if (typeof Intercom === 'function') {
        Intercom('boot', {
            app_id: process.env.INTERCOM_ID
        });
    }
}