/*
    This file is part of TON Blockchain source code.

    TON Blockchain 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 2
    of the License, or (at your option) any later version.

    TON Blockchain 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 TON Blockchain.  If not, see <http://www.gnu.org/licenses/>.

    In addition, as a special exception, the copyright holders give permission
    to link the code of portions of this program with the OpenSSL library.
    You must obey the GNU General Public License in all respects for all
    of the code used other than OpenSSL. If you modify file(s) with this
    exception, you may extend this exception to your version of the file(s),
    but you are not obligated to do so. If you do not wish to do so, delete this
    exception statement from your version. If you delete this exception statement
    from all source files in the program, then also delete it here.

    Copyright 2017-2020 Telegram Systems LLP
*/
#pragma once

#include "adnl.h"
#include "adnl-peer-table.h"
#include "keys/encryptor.h"

#include <map>

namespace ton {

namespace adnl {

class AdnlInboundTunnelPoint : public AdnlTunnel {
 public:
  virtual ~AdnlInboundTunnelPoint() = default;
  virtual void receive_packet(AdnlNodeIdShort src, td::IPAddress src_addr, td::BufferSlice datagram) = 0;
};

class AdnlInboundTunnelEndpoint : public AdnlInboundTunnelPoint {
 public:
  AdnlInboundTunnelEndpoint(PublicKeyHash pubkey_hash, std::vector<PublicKeyHash> decrypt_via, AdnlNodeIdShort proxy_to,
                            td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<AdnlPeerTable> adnl)
      : pubkey_hash_(std::move(pubkey_hash))
      , decrypt_via_(std::move(decrypt_via))
      , proxy_to_(std::move(proxy_to))
      , keyring_(std::move(keyring))
      , adnl_(std::move(adnl)) {
  }

  void receive_packet(AdnlNodeIdShort src, td::IPAddress src_addr, td::BufferSlice datagram) override;
  void receive_packet_cont(AdnlNodeIdShort src, td::IPAddress src_addr, td::BufferSlice datagram, size_t idx);
  void decrypted_packet(AdnlNodeIdShort src, td::IPAddress src_addr, td::BufferSlice data, size_t idx);

 private:
  PublicKeyHash pubkey_hash_;
  std::vector<PublicKeyHash> decrypt_via_;
  AdnlNodeIdShort proxy_to_;
  td::actor::ActorId<keyring::Keyring> keyring_;
  td::actor::ActorId<AdnlPeerTable> adnl_;
};

class AdnlInboundTunnelMidpoint : public AdnlInboundTunnelPoint {
 public:
  AdnlInboundTunnelMidpoint(ton::PublicKey encrypt_via, AdnlNodeIdShort proxy_to, AdnlNodeIdShort proxy_as,
                            td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<AdnlPeerTable> adnl)
      : encrypt_via_(std::move(encrypt_via)), proxy_to_(proxy_to), proxy_as_(proxy_as), keyring_(keyring), adnl_(adnl) {
  }
  void start_up() override;
  void receive_packet(AdnlNodeIdShort src, td::IPAddress src_addr, td::BufferSlice datagram) override;

 private:
  ton::PublicKeyHash encrypt_key_hash_;
  ton::PublicKey encrypt_via_;
  std::unique_ptr<Encryptor> encryptor_;
  AdnlNodeIdShort proxy_to_;
  AdnlNodeIdShort proxy_as_;
  td::actor::ActorId<keyring::Keyring> keyring_;
  td::actor::ActorId<AdnlPeerTable> adnl_;
};

class AdnlProxyNode : public td::actor::Actor {
 public:
  void receive_message(AdnlNodeIdShort src, AdnlNodeIdShort dst, td::BufferSlice data);
  void receive_query(AdnlNodeIdShort src, AdnlNodeIdShort dst, td::BufferSlice data,
                     td::Promise<td::BufferSlice> promise);

 private:
  std::map<PublicKeyHash, td::actor::ActorOwn<AdnlInboundTunnelMidpoint>> mid_;
};

}  // namespace adnl

}  // namespace ton