import { RequestFnType } from "./utils/request";
import { InsightsEvent } from './types'
import { isUndefined } from "./utils";

export function makeSendEvents(requestFn: RequestFnType) {
  return function sendEvents(
    eventData: InsightsEvent[]
  ) {
    if (this._userHasOptedOut) {
      return;
    }
    if (!this._hasCredentials) {
      throw new Error(
        "Before calling any methods on the analytics, you first need to call the 'init' function with appId and apiKey parameters"
      );
    }

    const events: InsightsEvent[] = eventData.map(data => {
      const {filters, ...rest}  = data;
      const payload: InsightsEvent = {
        ...rest,
        userToken: data?.userToken ?? this._userToken
      };
      if (!isUndefined(filters)) {
        payload.filters = filters.map(encodeURIComponent)
      }
      return payload;
    })

    return sendRequest(
      requestFn,
      this._appId,
      this._apiKey,
      this._ua,
      this._endpointOrigin,
      events
    );
  };
}

function sendRequest(
  requestFn: RequestFnType,
  appId: string,
  apiKey: string,
  userAgents: string[],
  endpointOrigin: string,
  events: InsightsEvent[]
) {
  // Auth query
  const ua = encodeURIComponent(userAgents.join('; '));
  const reportingURL = `${endpointOrigin}/1/events?X-Algolia-Application-Id=${appId}&X-Algolia-API-Key=${apiKey}&X-Algolia-Agent=${ua}`;
  return requestFn(reportingURL, { events });
}