/** @access public */

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3.0 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

import { armor } from '../encoding/armor';
import defaultConfig from '../config';
import enums from '../enums';
import Key from './key';

/**
 * Class that represents an OpenPGP Public Key
 */
class PublicKey extends Key {
  /**
   * @param {PacketList} packetlist - The packets that form this key
   */
  constructor(packetlist) {
    super();
    this.keyPacket = null;
    this.revocationSignatures = [];
    this.directSignatures = [];
    this.users = [];
    this.subkeys = [];
    if (packetlist) {
      this.packetListToStructure(packetlist, new Set([enums.packet.secretKey, enums.packet.secretSubkey]));
      if (!this.keyPacket) {
        throw new Error('Invalid key: missing public-key packet');
      }
    }
  }

  /**
   * Returns true if this is a private key
   * @returns {false}
   */
  isPrivate() {
    return false;
  }

  /**
   * Returns key as public key (shallow copy)
   * @returns {PublicKey} New public Key
   */
  toPublic() {
    return this;
  }

  /**
   * Returns ASCII armored text of key
   * @param {Object} [config] - Full configuration, defaults to openpgp.config
   * @returns {ReadableStream<String>} ASCII armor.
   */
  armor(config = defaultConfig) {
    // An ASCII-armored Transferable Public Key packet sequence of a v6 key MUST NOT contain a CRC24 footer.
    const emitChecksum = this.keyPacket.version !== 6;
    return armor(enums.armor.publicKey, this.toPacketList().write(), undefined, undefined, undefined, emitChecksum, config);
  }
}

export default PublicKey;