import { Utils } from "../misc/utils";

import { AppIdService as AppIdServiceAbstraction } from "../abstractions/appId.service";
import { StorageService } from "../abstractions/storage.service";

export class AppIdService implements AppIdServiceAbstraction {
  constructor(private storageService: StorageService) {}

  getAppId(): Promise<string> {
    return this.makeAndGetAppId("appId");
  }

  getAnonymousAppId(): Promise<string> {
    return this.makeAndGetAppId("anonymousAppId");
  }

  private async makeAndGetAppId(key: string) {
    const existingId = await this.storageService.get<string>(key);
    if (existingId != null) {
      return existingId;
    }

    const guid = Utils.newGuid();
    await this.storageService.save(key, guid);
    return guid;
  }
}