// 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 EventEmitter from 'eventemitter3';

export default class JsonRpcBase extends EventEmitter {
  constructor () {
    super();

    this._id = 1;
    this._debug = false;
    this._connected = false;
  }

  encode (method, params) {
    const json = JSON.stringify({
      jsonrpc: '2.0',
      method: method,
      params: params,
      id: this._id++
    });

    return json;
  }

  _setConnected () {
    if (!this._connected) {
      this._connected = true;
      this.emit('open');
    }
  }

  _setDisconnected () {
    if (this._connected) {
      this._connected = false;
      this.emit('close');
    }
  }

  get id () {
    return this._id;
  }

  get isDebug () {
    return this._debug;
  }

  get isConnected () {
    return this._connected;
  }

  setDebug (flag) {
    this._debug = flag;
  }

  error (error) {
    if (this.isDebug) {
      console.error(error);
    }
  }

  log (log) {
    if (this.isDebug) {
      console.log(log);
    }
  }
}