/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _DOCUMENTDB_ODBC_TEST_TEST_SERVER
#define _DOCUMENTDB_ODBC_TEST_TEST_SERVER

#include <stdint.h>

#include <vector>

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0601
#endif  // _WIN32_WINNT

#include <boost/asio.hpp>
#include <boost/thread.hpp>

namespace documentdb {

/**
 * Test Server Session.
 */
class TestServerSession {
 public:
  /**
   * Construct new instance of class.
   * @param service Asio service.
   * @param responses Responses to provide to requests.
   */
  TestServerSession(boost::asio::io_service& service,
                    const std::vector< std::vector< int8_t > >& responses);

  /**
   * Get socket.
   */
  boost::asio::ip::tcp::socket& GetSocket() {
    return socket;
  }

  /**
   * Start session.
   */
  void Start();

  /**
   * Get response at index.
   * @param idx Index.
   * @return Response.
   */
  const std::vector< int8_t >& GetResponse(size_t idx) const {
    return responses.at(idx);
  }

 private:
  /**
   * Receive next request.
   */
  void ReadNextRequest();

  /**
   * Handle received request size.
   * @param error Error.
   * @param bytesTransferred Bytes transferred.
   */
  void HandleRequestSizeReceived(const boost::system::error_code& error,
                                 size_t bytesTransferred);

  /**
   * Handle received request.
   * @param error Error.
   * @param bytesTransferred Bytes transferred.
   */
  void HandleRequestReceived(const boost::system::error_code& error,
                             size_t bytesTransferred);

  /**
   * Handle received request.
   * @param error Error.
   * @param bytesTransferred Bytes transferred.
   */
  void HandleResponseSent(const boost::system::error_code& error,
                          size_t bytesTransferred);

  // The socket used to communicate with the client.
  boost::asio::ip::tcp::socket socket;

  // Received requests.
  std::vector< std::vector< int8_t > > requests;

  // Responses to provide.
  const std::vector< std::vector< int8_t > > responses;

  // Number of requests answered.
  size_t requestsResponded;
};

/**
 * Test Server.
 */
class TestServer {
 public:
  /**
   * Constructor.
   * @param port TCP port to listen.
   */
  TestServer(uint16_t port = 11110);

  /**
   * Destructor.
   */
  ~TestServer();

  /**
   * Push new handshake response to send.
   * @param accept Accept or reject response.
   */
  void PushHandshakeResponse(bool accept) {
    std::vector< int8_t > rsp(4 + 1);
    rsp[0] = 1;
    rsp[4] = accept ? 1 : 0;

    PushResponse(rsp);
  }

  /**
   * Push new response to send.
   * @param resp Response to push.
   */
  void PushResponse(const std::vector< int8_t >& resp) {
    responses.push_back(resp);
  }

  /**
   * Get specified session.
   * @param idx Index.
   * @return Specified session.
   */
  TestServerSession& GetSession(size_t idx = 0) {
    return *sessions.at(idx);
  }

  /**
   * Start server.
   */
  void Start();

  /**
   * Stop server.
   */
  void Stop();

 private:
  /**
   * Start accepting connections.
   */
  void StartAccept();

  /**
   * Handle accepted connection.
   * @param session Accepted session.
   * @param error Error.
   */
  void HandleAccept(boost::shared_ptr< TestServerSession > session,
                    const boost::system::error_code& error);

  // Service.
  boost::asio::io_service service;

  // Acceptor.
  boost::asio::ip::tcp::acceptor acceptor;

  // Reponses.
  std::vector< std::vector< int8_t > > responses;

  // Sessions.
  std::vector< boost::shared_ptr< TestServerSession > > sessions;

  // Server Thread.
  boost::shared_ptr< boost::thread > serverThread;
};

}  // namespace documentdb

#endif  //_DOCUMENTDB_ODBC_TEST_TEST_SERVER