/**
 * 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 LIBHDFSPP_TEST_MOCK_CONNECTION_H_
#define LIBHDFSPP_TEST_MOCK_CONNECTION_H_

#include "common/async_stream.h"

#include <asio/error_code.hpp>
#include <asio/buffer.hpp>
#include <asio/streambuf.hpp>
#include <asio/io_service.hpp>

#include <gmock/gmock.h>

namespace hdfs {

class MockConnectionBase : public AsyncStream{
public:
  MockConnectionBase(::asio::io_service *io_service);
  virtual ~MockConnectionBase();
  typedef std::pair<asio::error_code, std::string> ProducerResult;

  void async_read_some(const MutableBuffers &buf,
          std::function<void (const asio::error_code & error,
                                 std::size_t bytes_transferred) > handler) override {
    if (produced_.size() == 0) {
      ProducerResult r = Produce();
      if (r.first) {
        io_service_->post(std::bind(handler, r.first, 0));
        return;
      }
      asio::mutable_buffers_1 data = produced_.prepare(r.second.size());
      asio::buffer_copy(data, asio::buffer(r.second));
      produced_.commit(r.second.size());
    }

    size_t len = std::min(asio::buffer_size(buf), produced_.size());
    asio::buffer_copy(buf, produced_.data());
    produced_.consume(len);
    io_service_->post(std::bind(handler, asio::error_code(), len));
  }

  void async_write_some(const ConstBuffers &buf,
            std::function<void (const asio::error_code & error,
                                 std::size_t bytes_transferred) > handler) override {
    // CompletionResult res = OnWrite(buf);
    io_service_->post(std::bind(handler, asio::error_code(), asio::buffer_size(buf)));
  }

protected:
  virtual ProducerResult Produce() = 0;
  ::asio::io_service *io_service_;

private:
  asio::streambuf produced_;
};
}

#endif