// 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.
//
// Common utilities for Quic tests

#ifndef NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_
#define NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_

#include <string>
#include <vector>

#include "base/strings/string_piece.h"
#include "net/quic/congestion_control/send_algorithm_interface.h"
#include "net/quic/quic_connection.h"
#include "net/quic/quic_framer.h"
#include "net/quic/quic_session.h"
#include "net/quic/quic_spdy_decompressor.h"
#include "net/quic/test_tools/mock_clock.h"
#include "net/quic/test_tools/mock_random.h"
#include "net/spdy/spdy_framer.h"
#include "testing/gmock/include/gmock/gmock.h"

namespace net {

namespace test {

void CompareCharArraysWithHexError(const std::string& description,
                                   const char* actual,
                                   const int actual_len,
                                   const char* expected,
                                   const int expected_len);

// Returns the length of a QuicPacket that is capable of holding either a
// stream frame or a minimal ack frame.  Sets |*payload_length| to the number
// of bytes of stream data that will fit in such a packet.
size_t GetPacketLengthForOneStream(
    QuicVersion version,
    bool include_version,
    QuicSequenceNumberLength sequence_number_length,
    InFecGroup is_in_fec_group,
    size_t* payload_length);

// Size in bytes of the stream frame fields for an arbitrary StreamID and
// offset and the last frame in a packet.
size_t GetMinStreamFrameSize(QuicVersion version);

// Returns QuicConfig set to default values.
QuicConfig DefaultQuicConfig();

class MockFramerVisitor : public QuicFramerVisitorInterface {
 public:
  MockFramerVisitor();
  ~MockFramerVisitor();

  MOCK_METHOD1(OnError, void(QuicFramer* framer));
  // The constructor sets this up to return false by default.
  MOCK_METHOD1(OnProtocolVersionMismatch, bool(QuicVersion version));
  MOCK_METHOD0(OnPacket, void());
  MOCK_METHOD1(OnPublicResetPacket, void(const QuicPublicResetPacket& header));
  MOCK_METHOD1(OnVersionNegotiationPacket,
               void(const QuicVersionNegotiationPacket& packet));
  MOCK_METHOD0(OnRevivedPacket, void());
  // The constructor sets this up to return true by default.
  MOCK_METHOD1(OnPacketHeader, bool(const QuicPacketHeader& header));
  MOCK_METHOD1(OnFecProtectedPayload, void(base::StringPiece payload));
  MOCK_METHOD1(OnStreamFrame, bool(const QuicStreamFrame& frame));
  MOCK_METHOD1(OnAckFrame, bool(const QuicAckFrame& frame));
  MOCK_METHOD1(OnCongestionFeedbackFrame,
               bool(const QuicCongestionFeedbackFrame& frame));
  MOCK_METHOD1(OnFecData, void(const QuicFecData& fec));
  MOCK_METHOD1(OnRstStreamFrame, bool(const QuicRstStreamFrame& frame));
  MOCK_METHOD1(OnConnectionCloseFrame,
               bool(const QuicConnectionCloseFrame& frame));
  MOCK_METHOD1(OnGoAwayFrame, bool(const QuicGoAwayFrame& frame));
  MOCK_METHOD0(OnPacketComplete, void());

 private:
  DISALLOW_COPY_AND_ASSIGN(MockFramerVisitor);
};

class NoOpFramerVisitor : public QuicFramerVisitorInterface {
 public:
  NoOpFramerVisitor() {}

  virtual void OnError(QuicFramer* framer) OVERRIDE {}
  virtual void OnPacket() OVERRIDE {}
  virtual void OnPublicResetPacket(
      const QuicPublicResetPacket& packet) OVERRIDE {}
  virtual void OnVersionNegotiationPacket(
      const QuicVersionNegotiationPacket& packet) OVERRIDE {}
  virtual void OnRevivedPacket() OVERRIDE {}
  virtual bool OnProtocolVersionMismatch(QuicVersion version) OVERRIDE;
  virtual bool OnPacketHeader(const QuicPacketHeader& header) OVERRIDE;
  virtual void OnFecProtectedPayload(base::StringPiece payload) OVERRIDE {}
  virtual bool OnStreamFrame(const QuicStreamFrame& frame) OVERRIDE;
  virtual bool OnAckFrame(const QuicAckFrame& frame) OVERRIDE;
  virtual bool OnCongestionFeedbackFrame(
      const QuicCongestionFeedbackFrame& frame) OVERRIDE;
  virtual void OnFecData(const QuicFecData& fec) OVERRIDE {}
  virtual bool OnRstStreamFrame(const QuicRstStreamFrame& frame) OVERRIDE;
  virtual bool OnConnectionCloseFrame(
      const QuicConnectionCloseFrame& frame) OVERRIDE;
  virtual bool OnGoAwayFrame(const QuicGoAwayFrame& frame) OVERRIDE;
  virtual void OnPacketComplete() OVERRIDE {}

 private:
  DISALLOW_COPY_AND_ASSIGN(NoOpFramerVisitor);
};

class FramerVisitorCapturingPublicReset : public NoOpFramerVisitor {
 public:
  FramerVisitorCapturingPublicReset();
  virtual ~FramerVisitorCapturingPublicReset();

  virtual void OnPublicResetPacket(
      const QuicPublicResetPacket& packet) OVERRIDE;

  const QuicPublicResetPacket public_reset_packet() {
    return public_reset_packet_;
  }

 private:
  QuicPublicResetPacket public_reset_packet_;
};

class FramerVisitorCapturingFrames : public NoOpFramerVisitor {
 public:
  FramerVisitorCapturingFrames();
  virtual ~FramerVisitorCapturingFrames();

  // NoOpFramerVisitor
  virtual void OnVersionNegotiationPacket(
      const QuicVersionNegotiationPacket& packet) OVERRIDE;
  virtual bool OnPacketHeader(const QuicPacketHeader& header) OVERRIDE;
  virtual bool OnStreamFrame(const QuicStreamFrame& frame) OVERRIDE;
  virtual bool OnAckFrame(const QuicAckFrame& frame) OVERRIDE;
  virtual bool OnCongestionFeedbackFrame(
      const QuicCongestionFeedbackFrame& frame) OVERRIDE;
  virtual bool OnRstStreamFrame(const QuicRstStreamFrame& frame) OVERRIDE;
  virtual bool OnConnectionCloseFrame(
      const QuicConnectionCloseFrame& frame) OVERRIDE;
  virtual bool OnGoAwayFrame(const QuicGoAwayFrame& frame) OVERRIDE;

  size_t frame_count() const { return frame_count_; }
  QuicPacketHeader* header() { return &header_; }
  const std::vector<QuicStreamFrame>* stream_frames() const {
    return &stream_frames_;
  }
  QuicAckFrame* ack() { return ack_.get(); }
  QuicCongestionFeedbackFrame* feedback() { return feedback_.get(); }
  QuicRstStreamFrame* rst() { return rst_.get(); }
  QuicConnectionCloseFrame* close() { return close_.get(); }
  QuicGoAwayFrame* goaway() { return goaway_.get(); }
  QuicVersionNegotiationPacket* version_negotiation_packet() {
    return version_negotiation_packet_.get();
  }

 private:
  size_t frame_count_;
  QuicPacketHeader header_;
  std::vector<QuicStreamFrame> stream_frames_;
  scoped_ptr<QuicAckFrame> ack_;
  scoped_ptr<QuicCongestionFeedbackFrame> feedback_;
  scoped_ptr<QuicRstStreamFrame> rst_;
  scoped_ptr<QuicConnectionCloseFrame> close_;
  scoped_ptr<QuicGoAwayFrame> goaway_;
  scoped_ptr<QuicVersionNegotiationPacket> version_negotiation_packet_;

  DISALLOW_COPY_AND_ASSIGN(FramerVisitorCapturingFrames);
};

class MockConnectionVisitor : public QuicConnectionVisitorInterface {
 public:
  MockConnectionVisitor();
  virtual ~MockConnectionVisitor();

  MOCK_METHOD1(OnStreamFrames, bool(const std::vector<QuicStreamFrame>& frame));
  MOCK_METHOD1(OnRstStream, void(const QuicRstStreamFrame& frame));
  MOCK_METHOD1(OnGoAway, void(const QuicGoAwayFrame& frame));
  MOCK_METHOD2(ConnectionClose, void(QuicErrorCode error, bool from_peer));
  MOCK_METHOD0(OnCanWrite, bool());
  MOCK_CONST_METHOD0(HasPendingHandshake, bool());
  MOCK_METHOD1(OnSuccessfulVersionNegotiation,
               void(const QuicVersion& version));

 private:
  DISALLOW_COPY_AND_ASSIGN(MockConnectionVisitor);
};

class MockHelper : public QuicConnectionHelperInterface {
 public:
  MockHelper();
  virtual ~MockHelper();

  MOCK_METHOD1(SetConnection, void(QuicConnection* connection));
  const QuicClock* GetClock() const;
  QuicRandom* GetRandomGenerator();
  void AdvanceTime(QuicTime::Delta delta);
  MOCK_METHOD1(WritePacketToWire,
               WriteResult(const QuicEncryptedPacket& packet));
  MOCK_METHOD0(IsWriteBlockedDataBuffered, bool());
  MOCK_METHOD1(IsWriteBlocked, bool(int stream_id));
  virtual QuicAlarm* CreateAlarm(QuicAlarm::Delegate* delegate);

 private:
  MockClock clock_;
  MockRandom random_generator_;
};

class MockConnection : public QuicConnection {
 public:
  // Uses a MockHelper.
  MockConnection(QuicGuid guid, IPEndPoint address, bool is_server);
  MockConnection(QuicGuid guid,
                 IPEndPoint address,
                 QuicConnectionHelperInterface* helper,
                 bool is_server);
  virtual ~MockConnection();

  // If the constructor that uses a MockHelper has been used then this method
  // will advance the time of the MockClock.
  void AdvanceTime(QuicTime::Delta delta);

  MOCK_METHOD3(ProcessUdpPacket, void(const IPEndPoint& self_address,
                                      const IPEndPoint& peer_address,
                                      const QuicEncryptedPacket& packet));
  MOCK_METHOD1(SendConnectionClose, void(QuicErrorCode error));
  MOCK_METHOD2(SendConnectionCloseWithDetails, void(QuicErrorCode error,
                                                    const string& details));
  MOCK_METHOD2(SendRstStream, void(QuicStreamId id,
                                   QuicRstStreamErrorCode error));
  MOCK_METHOD3(SendGoAway, void(QuicErrorCode error,
                                QuicStreamId last_good_stream_id,
                                const string& reason));
  MOCK_METHOD0(OnCanWrite, bool());
  MOCK_CONST_METHOD0(HasPendingHandshake, bool());

  void ProcessUdpPacketInternal(const IPEndPoint& self_address,
                                const IPEndPoint& peer_address,
                                const QuicEncryptedPacket& packet) {
    QuicConnection::ProcessUdpPacket(self_address, peer_address, packet);
  }

  virtual bool OnProtocolVersionMismatch(QuicVersion version) OVERRIDE {
    return false;
  }

 private:
  const bool has_mock_helper_;

  DISALLOW_COPY_AND_ASSIGN(MockConnection);
};

class PacketSavingConnection : public MockConnection {
 public:
  PacketSavingConnection(QuicGuid guid, IPEndPoint address, bool is_server);
  virtual ~PacketSavingConnection();

  virtual bool SendOrQueuePacket(
      EncryptionLevel level,
      QuicPacketSequenceNumber sequence_number,
      QuicPacket* packet,
      QuicPacketEntropyHash entropy_hash,
      TransmissionType transmission_type,
      HasRetransmittableData has_retransmittable_data,
      Force forced) OVERRIDE;

  std::vector<QuicPacket*> packets_;
  std::vector<QuicEncryptedPacket*> encrypted_packets_;

 private:
  DISALLOW_COPY_AND_ASSIGN(PacketSavingConnection);
};

class MockSession : public QuicSession {
 public:
  MockSession(QuicConnection* connection, bool is_server);
  virtual ~MockSession();

  MOCK_METHOD4(OnPacket, bool(const IPEndPoint& self_address,
                              const IPEndPoint& peer_address,
                              const QuicPacketHeader& header,
                              const std::vector<QuicStreamFrame>& frame));
  MOCK_METHOD2(ConnectionClose, void(QuicErrorCode error, bool from_peer));
  MOCK_METHOD1(CreateIncomingReliableStream,
               ReliableQuicStream*(QuicStreamId id));
  MOCK_METHOD0(GetCryptoStream, QuicCryptoStream*());
  MOCK_METHOD0(CreateOutgoingReliableStream, ReliableQuicStream*());
  MOCK_METHOD5(WritevData, QuicConsumedData(QuicStreamId id,
                                            const struct iovec* iov,
                                            int count,
                                            QuicStreamOffset offset,
                                            bool fin));
  MOCK_METHOD0(IsHandshakeComplete, bool());

 private:
  DISALLOW_COPY_AND_ASSIGN(MockSession);
};

class TestSession : public QuicSession {
 public:
  TestSession(QuicConnection* connection,
              const QuicConfig& config,
              bool is_server);
  virtual ~TestSession();

  MOCK_METHOD1(CreateIncomingReliableStream,
               ReliableQuicStream*(QuicStreamId id));
  MOCK_METHOD0(CreateOutgoingReliableStream, ReliableQuicStream*());

  void SetCryptoStream(QuicCryptoStream* stream);

  virtual QuicCryptoStream* GetCryptoStream();

 private:
  QuicCryptoStream* crypto_stream_;
  DISALLOW_COPY_AND_ASSIGN(TestSession);
};

class MockSendAlgorithm : public SendAlgorithmInterface {
 public:
  MockSendAlgorithm();
  virtual ~MockSendAlgorithm();

  MOCK_METHOD3(OnIncomingQuicCongestionFeedbackFrame,
               void(const QuicCongestionFeedbackFrame&,
                    QuicTime feedback_receive_time,
                    const SentPacketsMap&));
  MOCK_METHOD3(OnIncomingAck,
               void(QuicPacketSequenceNumber, QuicByteCount, QuicTime::Delta));
  MOCK_METHOD1(OnIncomingLoss, void(QuicTime));
  MOCK_METHOD5(OnPacketSent,
               bool(QuicTime sent_time, QuicPacketSequenceNumber, QuicByteCount,
                    TransmissionType, HasRetransmittableData));
  MOCK_METHOD2(OnPacketAbandoned, void(QuicPacketSequenceNumber sequence_number,
                                      QuicByteCount abandoned_bytes));
  MOCK_METHOD4(TimeUntilSend, QuicTime::Delta(QuicTime now, TransmissionType,
                                              HasRetransmittableData,
                                              IsHandshake));
  MOCK_METHOD0(BandwidthEstimate, QuicBandwidth(void));
  MOCK_METHOD0(SmoothedRtt, QuicTime::Delta(void));
  MOCK_METHOD0(RetransmissionDelay, QuicTime::Delta(void));

 private:
  DISALLOW_COPY_AND_ASSIGN(MockSendAlgorithm);
};

class TestEntropyCalculator :
      public QuicReceivedEntropyHashCalculatorInterface {
 public:
  TestEntropyCalculator() { }
  virtual ~TestEntropyCalculator() { }

  virtual QuicPacketEntropyHash EntropyHash(
      QuicPacketSequenceNumber sequence_number) const OVERRIDE;
};

class TestDecompressorVisitor : public QuicSpdyDecompressor::Visitor {
 public:
  virtual ~TestDecompressorVisitor() {}
  virtual bool OnDecompressedData(base::StringPiece data) OVERRIDE;
  virtual void OnDecompressionError() OVERRIDE;

  string data() { return data_; }
  bool error() { return error_; }

 private:
  string data_;
  bool error_;
};

class MockAckNotifierDelegate : public QuicAckNotifier::DelegateInterface {
 public:
  MockAckNotifierDelegate();
  virtual ~MockAckNotifierDelegate();

  MOCK_METHOD0(OnAckNotification, void());
};

}  // namespace test
}  // namespace net

#endif  // NET_QUIC_TEST_TOOLS_QUIC_TEST_UTILS_H_