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

export interface IAppDataOptions {
  dirPath?: string;
  requiredKeys?: string[];
}

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(optionsArg: IAppDataOptions = {}) {
    const appData = new AppData(optionsArg);
    await appData.readyDeferred.promise;
    return appData;
  }

  // instance
  public readyDeferred = plugins.smartpromise.defer();
  public options: IAppDataOptions;
  private kvStore: KeyValueStore;
  constructor(optionsArg: IAppDataOptions = {}) {
    this.options = optionsArg;
    this.init();
  }

  /**
   * inits app data
   * @param pathArg
   */
  private async init(pathArg?: string) {
    if (this.options.dirPath) {
      // 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.options.dirPath = appDataDir;
      } else if (dataExists) {
        this.options.dirPath = dataDir;
      } else {
        await plugins.smartfile.fs.ensureDir(nogitAppData);
        this.options.dirPath = nogitAppData;
      }
    }
    this.kvStore = new KeyValueStore('custom', 'appkv', this.options.dirPath, this.options.requiredKeys);
    this.readyDeferred.resolve();
  }

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

  public async logMissingKeys() {
    const kvStore = await this.getKvStore();
    const missingMandatoryKeys = kvStore.getMissingMandatoryKeys();
    if (missingMandatoryKeys.length > 0) {
      console.log(`The following mandatory keys are missing in the appdata:\n   -> ${missingMandatoryKeys.join(',\n   -> ')}`);
    } else {
      console.log('All mandatory keys are present in the appdata');
    }
  }
}