ElectronEventLoader.ts

import { DesktopAgent } from '@kite9/fdc3-standard';
import { GetAgentParams } from '@kite9/fdc3-standard';
import { Loader } from './Loader';

/**
 * This approach will resolve the loader promise if the fdc3Ready event occurs.
 * This is done by electron implementations setting window.fdc3.
 */
export class ElectronEventLoader implements Loader {
  done = false;

  poll(endTime: number, resolve: (value: DesktopAgent | void) => void, reject: (reason?: any) => void) {
    const timeRemaining = endTime - Date.now();
    if (globalThis.window.fdc3 != null) {
      resolve(globalThis.window.fdc3);
    } else if (timeRemaining > 0 && this.done == false) {
      setTimeout(() => this.poll(endTime, resolve, reject), 100);
    } else {
      resolve();
    }
  }

  cancel(): void {
    this.done = true;
  }

  get(params: GetAgentParams): Promise<DesktopAgent | void> {
    return new Promise<DesktopAgent | void>((resolve, reject) => {
      const endPollTime = Date.now() + (params.timeoutMs!! + 500);
      this.poll(endPollTime, resolve, reject);
    });
  }
}