// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_TOOLS_QUIC_TEST_TOOLS_QUIC_TEST_CLIENT_H_
#define NET_TOOLS_QUIC_TEST_TOOLS_QUIC_TEST_CLIENT_H_

#include <string>

#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/ip_endpoint.h"
#include "net/quic/quic_framer.h"
#include "net/quic/quic_packet_creator.h"
#include "net/quic/quic_protocol.h"
#include "net/tools/balsa/balsa_frame.h"
#include "net/tools/epoll_server/epoll_server.h"
#include "net/tools/quic/quic_client.h"
#include "net/tools/quic/test_tools/simple_client.h"

namespace net {

class ProofVerifier;

namespace tools {

class QuicPacketWriterWrapper;

namespace test {

class HTTPMessage;
class MockableQuicClient;

// A quic client which allows mocking out writes.
class MockableQuicClient : public QuicClient {
 public:
  MockableQuicClient(IPEndPoint server_address,
                     const QuicServerId& server_id,
                     const QuicVersionVector& supported_versions,
                     EpollServer* epoll_server);

  MockableQuicClient(IPEndPoint server_address,
                     const QuicServerId& server_id,
                     const QuicConfig& config,
                     const QuicVersionVector& supported_versions,
                     EpollServer* epoll_server);

  ~MockableQuicClient() override;
  QuicPacketWriter* CreateQuicPacketWriter() override;
  QuicConnectionId GenerateConnectionId() override;
  void UseWriter(QuicPacketWriterWrapper* writer);
  void UseConnectionId(QuicConnectionId connection_id);

 private:
  QuicConnectionId override_connection_id_;  // ConnectionId to use, if nonzero
  QuicPacketWriterWrapper* test_writer_;

  DISALLOW_COPY_AND_ASSIGN(MockableQuicClient);
};

// A toy QUIC client used for testing, mostly following the SimpleClient APIs.
class QuicTestClient : public SimpleClient,
                       public QuicDataStream::Visitor {
 public:
  QuicTestClient(IPEndPoint server_address,
                 const std::string& server_hostname,
                 bool secure,
                 const QuicVersionVector& supported_versions);
  QuicTestClient(IPEndPoint server_address,
                 const std::string& server_hostname,
                 bool secure,
                 const QuicConfig& config,
                 const QuicVersionVector& supported_versions);

  ~QuicTestClient() override;

  // ExpectCertificates controls whether the server is expected to provide
  // certificates. The certificates, if any, are not verified, but the common
  // name is recorded and available with |cert_common_name()|.
  void ExpectCertificates(bool on);

  // Sets the |user_agent_id| of the |client_|.
  void SetUserAgentID(const std::string& user_agent_id);

  // Wraps data in a quic packet and sends it.
  ssize_t SendData(std::string data, bool last_data);
  // As above, but |delegate| will be notified when |data| is ACKed.
  ssize_t SendData(std::string data,
                   bool last_data,
                   QuicAckNotifier::DelegateInterface* delegate);

  // From SimpleClient
  // Clears any outstanding state and sends a simple GET of 'uri' to the
  // server.  Returns 0 if the request failed and no bytes were written.
  ssize_t SendRequest(const std::string& uri) override;
  ssize_t SendMessage(const HTTPMessage& message) override;
  std::string SendCustomSynchronousRequest(const HTTPMessage& message) override;
  std::string SendSynchronousRequest(const std::string& uri) override;
  void Connect() override;
  void ResetConnection() override;
  void Disconnect() override;
  IPEndPoint LocalSocketAddress() const override;
  void ClearPerRequestState() override;
  void WaitForResponseForMs(int timeout_ms) override;
  void WaitForInitialResponseForMs(int timeout_ms) override;
  ssize_t Send(const void* buffer, size_t size) override;
  bool response_complete() const override;
  bool response_headers_complete() const override;
  const BalsaHeaders* response_headers() const override;
  int64 response_size() const override;
  int response_header_size() const override;
  int64 response_body_size() const override;
  size_t bytes_read() const override;
  size_t bytes_written() const override;
  bool buffer_body() const override;
  void set_buffer_body(bool buffer_body) override;
  bool ServerInLameDuckMode() const override;
  const std::string& response_body() override;
  bool connected() const override;
  // These functions are all unimplemented functions from SimpleClient, and log
  // DFATAL if called by users of SimpleClient.
  ssize_t SendAndWaitForResponse(const void* buffer, size_t size) override;
  void Bind(IPEndPoint* local_address) override;
  std::string SerializeMessage(const HTTPMessage& message) override;
  IPAddressNumber bind_to_address() const override;
  void set_bind_to_address(IPAddressNumber address) override;
  const IPEndPoint& address() const override;
  size_t requests_sent() const override;

  // From QuicDataStream::Visitor
  void OnClose(QuicDataStream* stream) override;

  // Configures client_ to take ownership of and use the writer.
  // Must be called before initial connect.
  void UseWriter(QuicPacketWriterWrapper* writer);
  // If the given ConnectionId is nonzero, configures client_ to use a specific
  // ConnectionId instead of a random one.
  void UseConnectionId(QuicConnectionId connection_id);

  // Returns nullptr if the maximum number of streams have already been created.
  QuicSpdyClientStream* GetOrCreateStream();

  QuicRstStreamErrorCode stream_error() { return stream_error_; }
  QuicErrorCode connection_error();

  MockableQuicClient* client();

  // cert_common_name returns the common name value of the server's certificate,
  // or the empty string if no certificate was presented.
  const std::string& cert_common_name() const;

  // Get the server config map.
  QuicTagValueMap GetServerConfig() const;

  void set_auto_reconnect(bool reconnect) { auto_reconnect_ = reconnect; }

  void set_priority(QuicPriority priority) { priority_ = priority; }

  // Sets client's FEC policy. This policy applies to the data stream(s), and
  // also to the headers and crypto streams.
  void SetFecPolicy(FecPolicy fec_policy);

  void WaitForWriteToFlush();

  EpollServer* epoll_server() { return &epoll_server_; }

 protected:
  QuicTestClient();

  void Initialize(bool secure);

  void set_client(MockableQuicClient* client) { client_.reset(client); }

 private:
  EpollServer epoll_server_;
  scoped_ptr<MockableQuicClient> client_;  // The actual client
  QuicSpdyClientStream* stream_;

  QuicRstStreamErrorCode stream_error_;

  bool response_complete_;
  bool response_headers_complete_;
  BalsaHeaders headers_;
  QuicPriority priority_;
  std::string response_;
  uint64 bytes_read_;
  uint64 bytes_written_;
  // The number of uncompressed HTTP header bytes received.
  int response_header_size_;
  // The number of HTTP body bytes received.
  int64 response_body_size_;
  // True if we tried to connect already since the last call to Disconnect().
  bool connect_attempted_;
  bool secure_;
  // The client will auto-connect exactly once before sending data.  If
  // something causes a connection reset, it will not automatically reconnect
  // unless auto_reconnect_ is true.
  bool auto_reconnect_;
  // Should we buffer the response body? Defaults to true.
  bool buffer_body_;
  // FEC policy for data sent by this client.
  FecPolicy fec_policy_;
  // proof_verifier_ points to a RecordingProofVerifier that is owned by
  // client_.
  ProofVerifier* proof_verifier_;

  DISALLOW_COPY_AND_ASSIGN(QuicTestClient);
};

}  // namespace test

}  // namespace tools
}  // namespace net

#endif  // NET_TOOLS_QUIC_TEST_TOOLS_QUIC_TEST_CLIENT_H_