// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/reporting/client/report_queue_impl.h"

#include <cstddef>
#include <memory>
#include <optional>
#include <utility>

#include "base/containers/queue.h"
#include "base/json/json_reader.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/test/gtest_util.h"
#include "base/test/task_environment.h"
#include "base/types/expected.h"
#include "base/values.h"
#include "components/reporting/client/mock_report_queue.h"
#include "components/reporting/client/report_queue_configuration.h"
#include "components/reporting/proto/synced/record_constants.pb.h"
#include "components/reporting/proto/test.pb.h"
#include "components/reporting/storage/storage_module_interface.h"
#include "components/reporting/storage/test_storage_module.h"
#include "components/reporting/util/rate_limiter_interface.h"
#include "components/reporting/util/status.h"
#include "components/reporting/util/status_macros.h"
#include "components/reporting/util/statusor.h"
#include "components/reporting/util/test_support_callbacks.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using ::testing::_;
using ::testing::AllOf;
using ::testing::EndsWith;
using ::testing::Eq;
using ::testing::MockFunction;
using ::testing::NiceMock;
using ::testing::Not;
using ::testing::NotNull;
using ::testing::Property;
using ::testing::Return;
using ::testing::StrEq;
using ::testing::WithArg;

using ::reporting::test::TestStorageModule;

namespace reporting {
namespace {

constexpr char kTestMessage[] = "TEST_MESSAGE";

class MockRateLimiter : public RateLimiterInterface {
 public:
  MOCK_METHOD(bool, Acquire, (size_t event_size), (override));
};

// Creates a |ReportQueue| using |TestStorageModule| and
// |TestEncryptionModule|. Allows access to the storage module for checking
// stored values.
class ReportQueueImplTest : public testing::Test {
 protected:
  ReportQueueImplTest()
      : priority_(Priority::IMMEDIATE),
        dm_token_("FAKE_DM_TOKEN"),
        destination_(Destination::UPLOAD_EVENTS),
        storage_module_(base::MakeRefCounted<TestStorageModule>()),
        policy_check_callback_(
            base::BindRepeating(&MockFunction<Status()>::Call,
                                base::Unretained(&mocked_policy_check_))) {}

  void SetUp() override {
    ON_CALL(mocked_policy_check_, Call())
        .WillByDefault(Return(Status::StatusOK()));

    auto config_result =
        ReportQueueConfiguration::Create({.destination = destination_})
            .SetDMToken(dm_token_)
            .SetPolicyCheckCallback(policy_check_callback_)
            .Build();
    ASSERT_TRUE(config_result.has_value()) << config_result.error();

    test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
    ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                            report_queue_event.cb());
    auto report_queue_result = report_queue_event.result();
    ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();

    report_queue_ = std::move(report_queue_result.value());
  }

  Status EnqueueTestRecord(
      std::unique_ptr<reporting::ReportQueueConfiguration> config,
      test::TestMessage test_message) {
    test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
    ReportQueueImpl::Create(std::move(config), storage_module_,
                            report_queue_event.cb());
    auto report_queue_result = report_queue_event.result();
    CHECK(report_queue_result.has_value()) << report_queue_result.error();

    report_queue_ = std::move(report_queue_result.value());

    test::TestEvent<Status> a;
    report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                           priority_, a.cb());
    return a.result();
  }

  TestStorageModule* test_storage_module() const {
    TestStorageModule* const test_storage_module =
        static_cast<TestStorageModule*>(storage_module_.get());
    EXPECT_THAT(test_storage_module, NotNull());
    return test_storage_module;
  }

  NiceMock<MockFunction<Status()>> mocked_policy_check_;

  base::test::TaskEnvironment task_environment_{
      base::test::TaskEnvironment::TimeSource::MOCK_TIME};

  const Priority priority_;

  std::unique_ptr<ReportQueue> report_queue_;
  base::OnceCallback<void(Status)> callback_;

  const std::string dm_token_;
  const Destination destination_;
  scoped_refptr<StorageModuleInterface> storage_module_;
  ReportQueueConfiguration::PolicyCheckCallback policy_check_callback_;
};

// Enqueues a random string and ensures that the string arrives unaltered in the
// |StorageModuleInterface|.
TEST_F(ReportQueueImplTest, SuccessfulStringRecord) {
  test::TestEvent<Status> a;
  report_queue_->Enqueue(kTestMessage, priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;
  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
}

// Enqueues a |base::Value| dictionary and ensures it arrives unaltered in the
// |StorageModuleInterface|.
TEST_F(ReportQueueImplTest, SuccessfulBaseValueRecord) {
  static constexpr char kTestKey[] = "TEST_KEY";
  static constexpr char kTestValue[] = "TEST_VALUE";
  base::DictValue test_dict;
  test_dict.Set(kTestKey, kTestValue);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(test_dict.Clone(), priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));

  std::optional<base::Value> value_result =
      base::JSONReader::Read(test_storage_module()->record().data(),
                             base::JSON_PARSE_CHROMIUM_EXTENSIONS);
  ASSERT_TRUE(value_result.has_value());
  EXPECT_EQ(value_result.value().GetDict(), test_dict);
}

// Enqueues a |TestMessage| and ensures that it arrives unaltered in the
// |StorageModuleInterface|.
TEST_F(ReportQueueImplTest, SuccessfulProtoRecord) {
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));

  test::TestMessage result_message;
  ASSERT_TRUE(
      result_message.ParseFromString(test_storage_module()->record().data()));
  ASSERT_EQ(result_message.test(), test_message.test());
}

// Verifies that records sent to `Destination::EVENT_METRIC` are `MetricData`
// protos.
TEST_F(ReportQueueImplTest,
       NonMetricDataFailsToEnqueueToEventMetricDestination) {
  auto config_result = ReportQueueConfiguration::Create(
                           {.destination = Destination::EVENT_METRIC})
                           .SetDMToken(dm_token_)
                           .SetPolicyCheckCallback(policy_check_callback_)
                           .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  // Test records are not MetricData so they should trigger CHECK.
  EXPECT_CHECK_DEATH(static_cast<void>(EnqueueTestRecord(
      std::move(config_result.value()), test::TestMessage())));
}

// Verifies that records sent to `Destination::TELEMETRY_METRIC` are
// `MetricData` protos.
TEST_F(ReportQueueImplTest,
       NonMetricDataFailsToEnqueueToTelemetryMetricDestination) {
  auto config_result = ReportQueueConfiguration::Create(
                           {.destination = Destination::TELEMETRY_METRIC})
                           .SetDMToken(dm_token_)
                           .SetPolicyCheckCallback(policy_check_callback_)
                           .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  // Test records are not MetricData so they should trigger CHECK.
  EXPECT_CHECK_DEATH(static_cast<void>(EnqueueTestRecord(
      std::move(config_result.value()), test::TestMessage())));
}

// Verifies that records sent to `Destination::INFO_METRIC` are
// `MetricData` protos.
TEST_F(ReportQueueImplTest,
       NonMetricDataFailsToEnqueueToInfoMetricDestination) {
  auto config_result = ReportQueueConfiguration::Create(
                           {.destination = Destination::INFO_METRIC})
                           .SetDMToken(dm_token_)
                           .SetPolicyCheckCallback(policy_check_callback_)
                           .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  // Test records are not MetricData so they should trigger CHECK.
  EXPECT_CHECK_DEATH(static_cast<void>(EnqueueTestRecord(
      std::move(config_result.value()), test::TestMessage())));
}

TEST_F(ReportQueueImplTest, SuccessfulProtoRecordWithRateLimiter) {
  auto rate_limiter = std::make_unique<MockRateLimiter>();
  auto* const mock_rate_limiter = rate_limiter.get();
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetRateLimiter(std::move(rate_limiter))
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
  ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                          report_queue_event.cb());
  auto report_queue_result = report_queue_event.result();
  ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();

  report_queue_ = std::move(report_queue_result.value());

  test::TestMessage test_message;
  test_message.set_test(kTestMessage);

  // Fail Enqueue by rate limiter.
  EXPECT_CALL(*mock_rate_limiter, Acquire(_)).WillOnce(Return(false));

  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_THAT(a_result,
              AllOf(Property(&Status::error_code, Eq(error::OUT_OF_RANGE)),
                    Property(&Status::error_message,
                             EndsWith(" rejected by rate limiter"))))
      << a_result;

  // Succeed Enqueue by rate limiter.
  EXPECT_CALL(*mock_rate_limiter, Acquire(_)).WillOnce(Return(true));

  test::TestEvent<Status> b;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, b.cb());
  const auto b_result = b.result();
  EXPECT_OK(b_result) << b_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));

  test::TestMessage result_message;
  ASSERT_TRUE(
      result_message.ParseFromString(test_storage_module()->record().data()));
  ASSERT_EQ(result_message.test(), test_message.test());
}

TEST_F(ReportQueueImplTest, SuccessfulProtoRecordWithReservedSpace) {
  static constexpr int64_t kReservedSpace = 12345L;
  auto config_result =
      ReportQueueConfiguration::Create(
          {.destination = destination_, .reserved_space = kReservedSpace})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestMessage test_message;
  test_message.set_test(kTestMessage);

  const auto a_result =
      EnqueueTestRecord(std::move(config_result.value()), test_message);
  EXPECT_OK(a_result) << a_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().reserved_space(),
              Eq(kReservedSpace));

  test::TestMessage result_message;
  ASSERT_TRUE(
      result_message.ParseFromString(test_storage_module()->record().data()));
  ASSERT_EQ(result_message.test(), test_message.test());
}

TEST_F(ReportQueueImplTest, SuccessfulProtoRecordWithSource) {
  SourceInfo source_info;
  source_info.set_source(SourceInfo::ASH);
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetSourceInfo(source_info)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  const auto a_result =
      EnqueueTestRecord(std::move(config_result.value()), test_message);
  EXPECT_OK(a_result) << a_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().reserved_space(), Eq(0L));
  EXPECT_THAT(test_storage_module()->record().source_info().source(),
              Eq(source_info.source()));

  test::TestMessage result_message;
  ASSERT_TRUE(
      result_message.ParseFromString(test_storage_module()->record().data()));
  EXPECT_THAT(result_message.test(), StrEq(test_message.test()));
}

TEST_F(ReportQueueImplTest, SuccessfulProtoRecordWithSourceVersion) {
  SourceInfo source_info;
  source_info.set_source(SourceInfo::ASH);
  source_info.set_source_version("1.0.0");
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetSourceInfo(source_info)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  const auto a_result =
      EnqueueTestRecord(std::move(config_result.value()), test_message);
  EXPECT_OK(a_result) << a_result;

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().reserved_space(), Eq(0L));
  EXPECT_THAT(test_storage_module()->record().source_info().source(),
              Eq(source_info.source()));
  EXPECT_THAT(test_storage_module()->record().source_info().source_version(),
              Eq(source_info.source_version()));

  test::TestMessage result_message;
  ASSERT_TRUE(
      result_message.ParseFromString(test_storage_module()->record().data()));
  EXPECT_THAT(result_message.test(), StrEq(test_message.test()));
}

// The call to enqueue should succeed, indicating that the storage operation has
// been scheduled. The callback should fail, indicating that storage was
// unsuccessful.
TEST_F(ReportQueueImplTest, CallSuccessCallbackFailure) {
  EXPECT_CALL(*test_storage_module(), AddRecord(Eq(priority_), _, _))
      .WillOnce(WithArg<2>([](base::OnceCallback<void(Status)> callback) {
        std::move(callback).Run(Status(error::UNKNOWN, "Failing for Test"));
      }));

  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto result = a.result();
  EXPECT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::UNKNOWN));
}

TEST_F(ReportQueueImplTest, EnqueueStringFailsOnPolicy) {
  EXPECT_CALL(mocked_policy_check_, Call())
      .WillOnce(Return(Status(error::UNAUTHENTICATED, "Failing for tests")));
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::string(kTestMessage), priority_, a.cb());
  const auto result = a.result();
  EXPECT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::UNAUTHENTICATED));
}

TEST_F(ReportQueueImplTest, EnqueueProtoFailsOnPolicy) {
  EXPECT_CALL(mocked_policy_check_, Call())
      .WillOnce(Return(Status(error::UNAUTHENTICATED, "Failing for tests")));
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto result = a.result();
  EXPECT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::UNAUTHENTICATED));
}

TEST_F(ReportQueueImplTest, EnqueueValueFailsOnPolicy) {
  EXPECT_CALL(mocked_policy_check_, Call())
      .WillOnce(Return(Status(error::UNAUTHENTICATED, "Failing for tests")));
  static constexpr char kTestKey[] = "TEST_KEY";
  static constexpr char kTestValue[] = "TEST_VALUE";
  base::DictValue test_dict;
  test_dict.Set(kTestKey, kTestValue);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(test_dict.Clone(), priority_, a.cb());
  const auto result = a.result();
  EXPECT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::UNAUTHENTICATED));
}

TEST_F(ReportQueueImplTest, EnqueueAndFlushSuccess) {
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;
  test::TestEvent<Status> f;
  report_queue_->Flush(priority_, f.cb());
  const auto f_result = f.result();
  EXPECT_OK(f_result) << f_result;
}

TEST_F(ReportQueueImplTest, EnqueueSuccessFlushFailure) {
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  test::TestEvent<Status> a;
  report_queue_->Enqueue(std::make_unique<test::TestMessage>(test_message),
                         priority_, a.cb());
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  EXPECT_CALL(*test_storage_module(), Flush(Eq(priority_), _))
      .WillOnce(WithArg<1>([](base::OnceCallback<void(Status)> callback) {
        std::move(callback).Run(Status(error::UNKNOWN, "Failing for Test"));
      }));
  test::TestEvent<Status> f;
  report_queue_->Flush(priority_, f.cb());
  const auto result = f.result();
  EXPECT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::UNKNOWN));
}

// Enqueues a random string into speculative queue, then enqueues a sting,
// attaches actual one and ensures that the string arrives unaltered in the
// |StorageModuleInterface|.
TEST_F(ReportQueueImplTest, SuccessfulSpeculativeStringRecord) {
  test::TestEvent<Status> a;
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a.cb());

  // Enqueue would not end until actual queue is attached.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
}

TEST_F(ReportQueueImplTest, SuccessfulSpeculativeStringRecordWithRateLimiter) {
  auto rate_limiter = std::make_unique<MockRateLimiter>();
  auto* const mock_rate_limiter = rate_limiter.get();
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetRateLimiter(std::move(rate_limiter))
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
  ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                          report_queue_event.cb());
  auto report_queue_result = report_queue_event.result();
  ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();

  report_queue_ = std::move(report_queue_result.value());

  EXPECT_CALL(*mock_rate_limiter, Acquire(_)).WillOnce(Return(false));

  test::TestEvent<Status> a;
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a.cb());

  // Enqueue would not end until actual queue is attached.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  const auto a_result = a.result();
  EXPECT_THAT(a_result,
              AllOf(Property(&Status::error_code, Eq(error::OUT_OF_RANGE)),
                    Property(&Status::error_message,
                             EndsWith(" rejected by rate limiter"))))
      << a_result;

  EXPECT_CALL(*mock_rate_limiter, Acquire(_)).WillOnce(Return(true));

  test::TestEvent<Status> b;
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    b.cb());

  const auto b_result = b.result();
  EXPECT_OK(b_result) << b_result;

  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
}

TEST_F(ReportQueueImplTest,
       SuccessfulSpeculativeStringRecordWithReservedSpace) {
  static constexpr int64_t kReservedSpace = 12345L;
  auto config_result =
      ReportQueueConfiguration::Create(
          {.destination = destination_, .reserved_space = kReservedSpace})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
  ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                          report_queue_event.cb());
  auto report_queue_result = report_queue_event.result();
  ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();

  report_queue_ = std::move(report_queue_result.value());

  test::TestEvent<Status> a;
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a.cb());

  // Enqueue would not end until actual queue is attached.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();

  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
  EXPECT_THAT(test_storage_module()->record().reserved_space(),
              Eq(kReservedSpace));
}

TEST_F(ReportQueueImplTest, SuccessfulSpeculativeStringRecordWithSource) {
  SourceInfo source_info;
  source_info.set_source(SourceInfo::ASH);
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetSourceInfo(source_info)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
  ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                          report_queue_event.cb());
  auto report_queue_result = report_queue_event.result();
  ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();
  report_queue_ = std::move(report_queue_result.value());

  test::TestEvent<Status> a;
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a.cb());

  // Enqueue would not end until actual queue is attached.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();
  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
  EXPECT_THAT(test_storage_module()->record().reserved_space(), Eq(0L));
  EXPECT_THAT(test_storage_module()->record().source_info().source(),
              Eq(source_info.source()));
}

TEST_F(ReportQueueImplTest,
       SuccessfulSpeculativeStringRecordWithSourceVersion) {
  SourceInfo source_info;
  source_info.set_source(SourceInfo::ASH);
  source_info.set_source_version("1.0.0");
  auto config_result =
      ReportQueueConfiguration::Create({.destination = destination_})
          .SetDMToken(dm_token_)
          .SetPolicyCheckCallback(policy_check_callback_)
          .SetSourceInfo(source_info)
          .Build();
  ASSERT_TRUE(config_result.has_value()) << config_result.error();

  test::TestEvent<StatusOr<std::unique_ptr<ReportQueue>>> report_queue_event;
  ReportQueueImpl::Create(std::move(config_result.value()), storage_module_,
                          report_queue_event.cb());
  auto report_queue_result = report_queue_event.result();
  ASSERT_TRUE(report_queue_result.has_value()) << report_queue_result.error();
  report_queue_ = std::move(report_queue_result.value());

  test::TestEvent<Status> a;
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a.cb());

  // Enqueue would not end until actual queue is attached.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  const auto a_result = a.result();
  EXPECT_OK(a_result) << a_result;

  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();
  EXPECT_THAT(test_storage_module()->priority(), Eq(priority_));
  EXPECT_THAT(test_storage_module()->record().has_timestamp_us(), Eq(true));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestMessage));
  EXPECT_THAT(test_storage_module()->record().reserved_space(), Eq(0L));
  EXPECT_THAT(test_storage_module()->record().source_info().source(),
              Eq(source_info.source()));
  EXPECT_THAT(test_storage_module()->record().source_info().source_version(),
              StrEq(source_info.source_version()));
}

TEST_F(ReportQueueImplTest, SpeculativeQueueMultipleRecordsAfterCreation) {
  static constexpr char kTestString1[] = "record1";
  static constexpr char kTestString2[] = "record2";
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});

  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  // Let everything ongoing to finish.
  task_environment_.RunUntilIdle();

  test::TestEvent<Status> test_event1;
  speculative_report_queue->Enqueue(kTestString1, Priority::IMMEDIATE,
                                    test_event1.cb());
  const auto result1 = test_event1.result();
  ASSERT_OK(result1) << result1;
  EXPECT_THAT(test_storage_module()->priority(), Eq(Priority::IMMEDIATE));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestString1));

  test::TestEvent<Status> test_event2;
  speculative_report_queue->Enqueue(kTestString2, Priority::SLOW_BATCH,
                                    test_event2.cb());
  const auto result2 = test_event2.result();
  ASSERT_OK(result2) << result2;
  EXPECT_THAT(test_storage_module()->priority(), Eq(Priority::SLOW_BATCH));
  EXPECT_THAT(test_storage_module()->record().data(), StrEq(kTestString2));
}

TEST_F(ReportQueueImplTest, SpeculativeQueueCreationFailedToCreate) {
  test::TestEvent<Status> test_event;

  {
    auto speculative_report_queue =
        SpeculativeReportQueueImpl::Create({.destination = destination_});

    // Fail to attach queue before calling `Enqueue`.
    speculative_report_queue->PrepareToAttachActualQueue().Run(
        base::unexpected(Status(error::UNKNOWN, "Failed for Test")));
    task_environment_.RunUntilIdle();  // Let `AttachActualQueue` finish.

    speculative_report_queue->Enqueue(kTestMessage, Priority::IMMEDIATE,
                                      test_event.cb());
  }  // Destructs `speculative_report_queue` now, fails all pending Enqueues.

  // Unfulfilled pending Enqueue returns the queue failure status.
  const auto result = test_event.result();
  ASSERT_FALSE(result.ok());
  EXPECT_THAT(result.code(), Eq(error::DATA_LOSS)) << result;
}

TEST_F(ReportQueueImplTest, SpeculativeQueueEnqueueAndCreationFailed) {
  test::TestEvent<Status> test_event;

  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});

  speculative_report_queue->Enqueue(kTestMessage, Priority::IMMEDIATE,
                                    test_event.cb());

  // Fail to attach queue after calling `Enqueue`.
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      base::unexpected(Status(error::UNKNOWN, "Failed for Test")));
  task_environment_.RunUntilIdle();  // Let `AttachActualQueue` finish.

  // Unfulfilled pending Enqueue returns the queue failure status.
  const auto result = test_event.result();
  ASSERT_FALSE(result.ok());
  EXPECT_THAT(result.code(), Eq(error::UNKNOWN)) << result;
}

TEST_F(ReportQueueImplTest, EnqueueRecordWithInvalidPriority) {
  test::TestEvent<Status> event;
  report_queue_->Enqueue(std::string(kTestMessage),
                         Priority::UNDEFINED_PRIORITY, event.cb());
  const auto result = event.result();

  ASSERT_FALSE(result.ok());
  EXPECT_THAT(result.code(), Eq(error::INVALID_ARGUMENT));
}

TEST_F(ReportQueueImplTest, FlushSpeculativeReportQueue) {
  test::TestEvent<Status> event;

  // Set up speculative report queue
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  task_environment_.RunUntilIdle();

  EXPECT_CALL(*test_storage_module(), Flush(Eq(priority_), _))
      .WillOnce(WithArg<1>([](base::OnceCallback<void(Status)> callback) {
        std::move(callback).Run(Status::StatusOK());
      }));

  speculative_report_queue->Flush(priority_, event.cb());
  const auto result = event.result();
  ASSERT_OK(result);
}

TEST_F(ReportQueueImplTest, FlushUninitializedSpeculativeReportQueue) {
  test::TestEvent<Status> event;

  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->Flush(priority_, event.cb());

  const auto result = event.result();
  ASSERT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::FAILED_PRECONDITION));
}

TEST_F(ReportQueueImplTest, FlushFailedSpeculativeReportQueue) {
  test::TestEvent<Status> event;

  {
    auto speculative_report_queue =
        SpeculativeReportQueueImpl::Create({.destination = destination_});

    speculative_report_queue->PrepareToAttachActualQueue().Run(
        base::unexpected(Status(error::UNKNOWN, "Failed for Test")));
    task_environment_.RunUntilIdle();  // Let `AttachActualQueue` finish.

    speculative_report_queue->Flush(priority_, event.cb());
  }  // Destructs speculative

  const auto result = event.result();
  ASSERT_FALSE(result.ok());
  EXPECT_THAT(result.error_code(), Eq(error::FAILED_PRECONDITION)) << result;
}

TEST_F(ReportQueueImplTest, AsyncProcessingReportQueue) {
  auto mock_queue = std::make_unique<MockReportQueue>();
  EXPECT_CALL(*mock_queue, AddProducedRecord)
      .Times(3)
      .WillRepeatedly([](ReportQueue::RecordProducer record_producer,
                         Priority event_priority,
                         ReportQueue::EnqueueCallback cb) {
        std::move(cb).Run(Status::StatusOK());
      });

  test::TestEvent<Status> a_string;
  mock_queue->Enqueue(std::string(kTestMessage), priority_, a_string.cb());

  test::TestEvent<Status> a_proto;
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  mock_queue->Enqueue(std::make_unique<test::TestMessage>(test_message),
                      priority_, a_proto.cb());

  test::TestEvent<Status> a_json;
  static constexpr char kTestKey[] = "TEST_KEY";
  static constexpr char kTestValue[] = "TEST_VALUE";
  base::DictValue test_dict;
  test_dict.Set(kTestKey, kTestValue);
  mock_queue->Enqueue(std::move(test_dict), priority_, a_json.cb());

  const auto a_string_result = a_string.result();
  EXPECT_OK(a_string_result) << a_string_result;
  const auto a_proto_result = a_proto.result();
  EXPECT_OK(a_proto_result) << a_proto_result;
  const auto a_json_result = a_json.result();
  EXPECT_OK(a_json_result) << a_json_result;
}

TEST_F(ReportQueueImplTest, AsyncProcessingSpeculativeReportQueue) {
  auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});

  test::TestEvent<Status> a_string;
  speculative_report_queue->Enqueue(std::string(kTestMessage), priority_,
                                    a_string.cb());

  test::TestEvent<Status> a_proto;
  test::TestMessage test_message;
  test_message.set_test(kTestMessage);
  speculative_report_queue->Enqueue(
      std::make_unique<test::TestMessage>(test_message), priority_,
      a_proto.cb());

  test::TestEvent<Status> a_json;
  static constexpr char kTestKey[] = "TEST_KEY";
  static constexpr char kTestValue[] = "TEST_VALUE";
  base::DictValue test_dict;
  test_dict.Set(kTestKey, kTestValue);
  speculative_report_queue->Enqueue(std::move(test_dict), priority_,
                                    a_json.cb());

  auto mock_queue = std::make_unique<MockReportQueue>();
  EXPECT_CALL(*mock_queue, AddProducedRecord)
      .Times(3)
      .WillRepeatedly([](ReportQueue::RecordProducer record_producer,
                         Priority event_priority,
                         ReportQueue::EnqueueCallback cb) {
        std::move(cb).Run(Status::StatusOK());
      });
  EXPECT_CALL(*mock_queue, GetDestination()).WillOnce(Return(destination_));
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(mock_queue));

  const auto a_string_result = a_string.result();
  EXPECT_OK(a_string_result) << a_string_result;
  const auto a_proto_result = a_proto.result();
  EXPECT_OK(a_proto_result) << a_proto_result;
  const auto a_json_result = a_json.result();
  EXPECT_OK(a_json_result) << a_json_result;
}

TEST_F(ReportQueueImplTest, GetDestinationForReportQueue) {
  EXPECT_THAT(report_queue_->GetDestination(), Eq(destination_));
}

TEST_F(ReportQueueImplTest, GetDestinationForSpeculativeReportQueueBeforeInit) {
  const auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  EXPECT_THAT(speculative_report_queue->GetDestination(), Eq(destination_));
}

TEST_F(ReportQueueImplTest, GetDestinationForSpeculativeReportQueueAfterInit) {
  const auto speculative_report_queue =
      SpeculativeReportQueueImpl::Create({.destination = destination_});
  speculative_report_queue->PrepareToAttachActualQueue().Run(
      std::move(report_queue_));
  task_environment_.RunUntilIdle();
  EXPECT_THAT(speculative_report_queue->GetDestination(), Eq(destination_));
}
}  // namespace
}  // namespace reporting