import * as plugins from './smartssh.plugins';
import * as helpers from './smartssh.classes.helpers';

import { SshDir } from './smartssh.classes.sshdir';
import { SshConfig } from './smartssh.classes.sshconfig';
import { SshKey } from './smartssh.classes.sshkey';

/**
 * SshInstance is the main class dealing with ssh management
 */
export class SshInstance {
  private _sshKeyArray: SshKey[]; // holds all ssh keys
  private _sshConfig: SshConfig; // sshConfig (e.g. represents ~/.ssh/config)
  private _sshDir: SshDir; // points to sshDir class instance.
  private _sshSync: boolean; // if set to true, the ssh dir will be kept in sync automatically
  constructor(optionsArg: { sshDirPath?: string; sshSync?: boolean } = {}) {
    optionsArg ? void 0 : (optionsArg = {});
    this._sshKeyArray = [];
    this._sshConfig = new SshConfig(this._sshKeyArray);
    this._sshDir = new SshDir(this._sshKeyArray, this._sshConfig, optionsArg.sshDirPath);
    this._sshSync = optionsArg.sshSync;
  }

  // altering methods
  addKey(sshKeyArg: SshKey) {
    this._syncAuto('from');
    this._sshKeyArray.push(sshKeyArg);
    this._syncAuto('to');
  }
  removeKey(sshKeyArg: SshKey) {
    this._syncAuto('from');
    let filteredArray = this._sshKeyArray.filter((sshKeyArg2: SshKey) => {
      return sshKeyArg != sshKeyArg2;
    });
    this._sshKeyArray = filteredArray;
    this._syncAuto('to');
  }
  replaceKey(sshKeyOldArg: SshKey, sshKeyNewArg: SshKey) {
    this._syncAuto('from');
    this.removeKey(sshKeyOldArg);
    this.addKey(sshKeyNewArg);
    this._syncAuto('to');
  }

  // non altering methods
  getKey(hostArg: string): SshKey {
    this._syncAuto('from');
    let filteredArray = this._sshKeyArray.filter(function(keyArg) {
      return keyArg.host === hostArg;
    });
    if (filteredArray.length > 0) {
      return filteredArray[0];
    } else {
      return undefined;
    }
  }
  get sshKeys(): SshKey[] {
    this._syncAuto('from');
    return this._sshKeyArray;
  }

  // FS methods

  /**
   * write SshInstance to disk
   */
  writeToDisk(dirPathArg?: string) {
    this._sync('to', dirPathArg);
  }

  /**
   * read ab SshInstance from disk
   */
  readFromDisk(dirPathArg?: string) {
    this._sync('from', dirPathArg);
  }

  /* ===============================================================
  ========================= Private Methods ========================
  ================================================================*/

  /**
   * method to invoke SshInstance _sync automatically when sshSync is true
   */
  private _syncAuto(directionArg: 'from' | 'to') {
    if (this._sshSync) {
      // if auto sync is not enabled, do nothing
      this._sync(directionArg);
    }
  }

  /**
   * private method to sync SshInstance
   */
  private _sync(directionArg: 'from' | 'to', dirPathArg?: string) {
    if (directionArg === 'from') {
      this._sshDir.readFromDir(dirPathArg); // call sync method of sshDir class;
    } else if (directionArg === 'to') {
      this._sshDir.writeToDir(dirPathArg);
    }
  }
}