// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

import { action, observable } from 'mobx';

export default class Store {
  @observable clientVersion = '';

  constructor (api) {
    this._api = api;
    this._api.on('connected', this.setupSubscriptions, this);

    if (this._api.isConnected) {
      this.setupSubscriptions();
    }
  }

  setupSubscriptions = () => {
    this._api.web3
      .clientVersion()
      .then(this.setClientVersion);
  }

  @action setClientVersion = (clientVersion) => {
    this.clientVersion = clientVersion;
  }

  static instance = null;

  static get (api) {
    if (!Store.instance) {
      Store.instance = new Store(api);
    }

    return Store.instance;
  }
}