import * as analytics from './library';
import handleOneAnalyticsEvent from './simpleanalytics';

declare const self: any;

const promise = (window as any)['Promise'];
if (!(promise instanceof Function) && !global) {
    console.error(
        `This script uses window.Promise which is not supported in your browser. Consider adding a polyfill like "es6-promise".`,
    );
}
const fetch = (window as any)['fetch'];
if (!(fetch instanceof Function) && !global) {
    console.error(
        `This script uses window.fetch which is not supported in your browser. Consider adding a polyfill like "fetch".`,
    );
}

// CoveoUAGlobal is the interface for the global function which also has a
// queue `q` of unexecuted parameters
export interface CoveoUAGlobal {
    (action: string, ...params: any[]): void;
    // CoveoAnalytics.q is the queue of last called actions before lib was included
    q?: [string, any[]][];
}

// On load of this script we get the global object `coveoua` (which would be)
// on `window` in a browser
const coveoua: CoveoUAGlobal = self.coveoua || handleOneAnalyticsEvent;

// Replace the quick shim with the real thing.
self.coveoua = handleOneAnalyticsEvent;

self.coveoanalytics = analytics;

// On normal execution this library should be loaded after the snippet execution
// so we will execute the actions in the `q` array
if (coveoua.q) {
    const initEvents = coveoua.q.filter((args: [string, any[]]) => args[0] === 'init');
    const otherEvents = coveoua.q.filter((args: [string, any[]]) => args[0] !== 'init');
    [...initEvents, ...otherEvents].forEach((args: [string, any[]]) => handleOneAnalyticsEvent.apply(void 0, args));
}

export default self.coveoua;