// Copyright 2015 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.

#include "blimp/net/client_connection_manager.h"

#include <stddef.h>

#include <string>

#include "base/callback_helpers.h"
#include "base/memory/ptr_util.h"
#include "base/message_loop/message_loop.h"
#include "blimp/common/create_blimp_message.h"
#include "blimp/common/proto/blimp_message.pb.h"
#include "blimp/common/protocol_version.h"
#include "blimp/net/blimp_connection.h"
#include "blimp/net/blimp_transport.h"
#include "blimp/net/test_common.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
#include "net/base/test_completion_callback.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using testing::_;
using testing::Eq;
using testing::Return;
using testing::SaveArg;

namespace blimp {
namespace {
const char kDummyClientToken[] = "dummy-client-token";
}  // namespace

class ClientConnectionManagerTest : public testing::Test {
 public:
  ClientConnectionManagerTest()
      : manager_(new ClientConnectionManager(&connection_handler_)),
        transport1_(new testing::StrictMock<MockTransport>),
        transport2_(new testing::StrictMock<MockTransport>),
        reader_(new MockPacketReader),
        writer_(new MockPacketWriter),
        connection_(new BlimpConnection(base::WrapUnique(reader_),
                                        base::WrapUnique(writer_))),
        start_connection_message_(
            CreateStartConnectionMessage(kDummyClientToken, kProtocolVersion)) {
    manager_->set_client_token(kDummyClientToken);
  }

  ~ClientConnectionManagerTest() override {}

 protected:
  base::MessageLoop message_loop_;
  testing::StrictMock<MockConnectionHandler> connection_handler_;
  std::unique_ptr<ClientConnectionManager> manager_;
  std::unique_ptr<testing::StrictMock<MockTransport>> transport1_;
  std::unique_ptr<testing::StrictMock<MockTransport>> transport2_;
  MockPacketReader* reader_;
  MockPacketWriter* writer_;
  std::unique_ptr<BlimpConnection> connection_;
  std::unique_ptr<BlimpMessage> start_connection_message_;
};

// The 1st transport connects, and the 2nd transport is not used.
TEST_F(ClientConnectionManagerTest, FirstTransportConnects) {
  net::CompletionCallback write_cb;
  net::CompletionCallback connect_cb_1;
  EXPECT_CALL(*transport1_, Connect(_)).WillOnce(SaveArg<0>(&connect_cb_1));
  EXPECT_CALL(connection_handler_, HandleConnectionPtr(Eq(connection_.get())));
  EXPECT_CALL(*writer_,
              WritePacket(BufferEqualsProto(*start_connection_message_), _))
      .WillOnce(SaveArg<1>(&write_cb));
  EXPECT_CALL(*transport1_, TakeConnectionPtr())
      .WillOnce(Return(connection_.release()));

  ASSERT_TRUE(connect_cb_1.is_null());
  manager_->AddTransport(std::move(transport1_));
  manager_->AddTransport(std::move(transport2_));
  manager_->Connect();
  ASSERT_FALSE(connect_cb_1.is_null());
  base::ResetAndReturn(&connect_cb_1).Run(net::OK);
  base::ResetAndReturn(&write_cb).Run(net::OK);
}

// The 1st transport fails to connect, and the 2nd transport connects.
TEST_F(ClientConnectionManagerTest, SecondTransportConnects) {
  net::CompletionCallback write_cb;
  net::CompletionCallback connect_cb_1;
  EXPECT_CALL(*transport1_, Connect(_)).WillOnce(SaveArg<0>(&connect_cb_1));
  net::CompletionCallback connect_cb_2;
  EXPECT_CALL(*transport2_, Connect(_)).WillOnce(SaveArg<0>(&connect_cb_2));
  EXPECT_CALL(*writer_,
              WritePacket(BufferEqualsProto(*start_connection_message_), _))
      .WillOnce(SaveArg<1>(&write_cb));
  EXPECT_CALL(connection_handler_, HandleConnectionPtr(Eq(connection_.get())));
  EXPECT_CALL(*transport2_, TakeConnectionPtr())
      .WillOnce(Return(connection_.release()));

  ASSERT_TRUE(connect_cb_1.is_null());
  ASSERT_TRUE(connect_cb_2.is_null());
  manager_->AddTransport(std::move(transport1_));
  manager_->AddTransport(std::move(transport2_));
  manager_->Connect();
  ASSERT_FALSE(connect_cb_1.is_null());
  base::ResetAndReturn(&connect_cb_1).Run(net::ERR_FAILED);
  ASSERT_FALSE(connect_cb_2.is_null());
  base::ResetAndReturn(&connect_cb_2).Run(net::OK);
  base::ResetAndReturn(&write_cb).Run(net::OK);
}

// Both transports fail to connect.
TEST_F(ClientConnectionManagerTest, BothTransportsFailToConnect) {
  net::CompletionCallback connect_cb_1;
  EXPECT_CALL(*transport1_, Connect(_)).WillOnce(SaveArg<0>(&connect_cb_1));
  net::CompletionCallback connect_cb_2;
  EXPECT_CALL(*transport2_, Connect(_)).WillOnce(SaveArg<0>(&connect_cb_2));

  ASSERT_TRUE(connect_cb_1.is_null());
  ASSERT_TRUE(connect_cb_2.is_null());
  manager_->AddTransport(std::move(transport1_));
  manager_->AddTransport(std::move(transport2_));
  manager_->Connect();
  ASSERT_FALSE(connect_cb_1.is_null());
  ASSERT_TRUE(connect_cb_2.is_null());
  base::ResetAndReturn(&connect_cb_1).Run(net::ERR_FAILED);
  ASSERT_FALSE(connect_cb_2.is_null());
  base::ResetAndReturn(&connect_cb_2).Run(net::ERR_FAILED);
}

}  // namespace blimp