import * as plugins from './npmextra.plugins.js';
import * as paths from './npmextra.paths.js';
import { KeyValueStore } from './npmextra.classes.keyvaluestore.js';

export class AppData {
  /**
   * creates appdata. If no pathArg is given, data will be stored here:
   * ${PWD}/.nogit/appdata
   * @param pathArg
   * @returns 
   */
  public static async createAndInit(pathArg?: string) {
    const appData = new AppData(pathArg);
    await appData.readyDeferred.promise;
    return appData;
  }

  // instance
  public readyDeferred = plugins.smartpromise.defer();
  public dirPathArg: string;
  private kvStore: KeyValueStore;
  constructor(pathArg?: string) {
    this.dirPathArg = pathArg;
    this.init();
  }

  /**
   * inits app data
   * @param pathArg
   */
  private async init(pathArg?: string) {
    if (this.dirPathArg) {
      // ok, nothing to do here;
    } else {
      const appDataDir = '/app/data';
      const dataDir = '/data';
      const nogitAppData = '.nogit/appdata';
      const appDataExists = plugins.smartfile.fs.isDirectory(appDataDir);
      const dataExists = plugins.smartfile.fs.isDirectory(dataDir);
      if (appDataExists) {
        this.dirPathArg = appDataDir;
      } else if (dataExists) {
        this.dirPathArg = dataDir;
      } else {
        await plugins.smartfile.fs.ensureDir(nogitAppData);
        this.dirPathArg = nogitAppData;
      }
    }
    this.kvStore = new KeyValueStore('custom', 'appkv', this.dirPathArg);
    this.readyDeferred.resolve();
  }

  /**
   * returns a kvtore that resides in appdata
   */
  public async getKvStore() {
    await this.readyDeferred.promise;
    return this.kvStore;
  }
}