// Copyright 2024 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/data_sharing/internal/group_data_model.h"

#include <cstdint>
#include <memory>

#include "base/files/scoped_temp_dir.h"
#include "base/files/scoped_temp_file.h"
#include "base/run_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/test/gmock_callback_support.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/task_environment.h"
#include "build/build_config.h"
#include "components/data_sharing/internal/collaboration_group_sync_bridge.h"
#include "components/data_sharing/public/features.h"
#include "components/data_sharing/public/group_data.h"
#include "components/data_sharing/test_support/fake_data_sharing_sdk_delegate.h"
#include "components/sync/model/entity_change.h"
#include "components/sync/test/data_type_store_test_util.h"
#include "components/sync/test/mock_data_type_local_change_processor.h"
#include "google_apis/gaia/gaia_id.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace data_sharing {

namespace {

using base::test::RunClosure;
using testing::_;
using testing::ElementsAre;
using testing::Eq;
using testing::IsEmpty;
using testing::Optional;

bool OptionalGroupMetadataDataMatches(std::optional<GroupData> a,
                                      std::optional<GroupData> b) {
  if (!a.has_value() && !b.has_value()) {
    return true;
  }
  if (a.has_value() != b.has_value()) {
    return false;
  }
  // Both have values, compare the GroupData.
  return a->group_token.group_id == b->group_token.group_id &&
         a->group_token.access_token == b->group_token.access_token &&
         a->display_name == b->display_name;
}

MATCHER_P(OptionalGroupMetadataDataEq, expected_group_data, "") {
  return OptionalGroupMetadataDataMatches(expected_group_data, arg);
}

// TODO(crbug.com/301390275): move helpers to work with CollaborationGroup
// entities to test utils files, they are used across multiple files.
sync_pb::CollaborationGroupSpecifics MakeSpecifics(
    const GroupId& id,
    const int64_t& changed_at_millis_since_unix_epoch) {
  sync_pb::CollaborationGroupSpecifics result;
  result.set_collaboration_id(id.value());
  result.set_changed_at_timestamp_millis_since_unix_epoch(
      changed_at_millis_since_unix_epoch);
  result.set_consistency_token(
      base::NumberToString(changed_at_millis_since_unix_epoch));
  return result;
}

syncer::EntityData EntityDataFromSpecifics(
    const sync_pb::CollaborationGroupSpecifics& specifics) {
  syncer::EntityData entity_data;
  *entity_data.specifics.mutable_collaboration_group() = specifics;
  entity_data.name = specifics.collaboration_id();
  return entity_data;
}

std::unique_ptr<syncer::EntityChange> EntityChangeAddFromSpecifics(
    const sync_pb::CollaborationGroupSpecifics& specifics) {
  return syncer::EntityChange::CreateAdd(specifics.collaboration_id(),
                                         EntityDataFromSpecifics(specifics));
}

std::unique_ptr<syncer::EntityChange> EntityChangeUpdateFromSpecifics(
    const sync_pb::CollaborationGroupSpecifics& specifics) {
  return syncer::EntityChange::CreateUpdate(specifics.collaboration_id(),
                                            EntityDataFromSpecifics(specifics));
}

std::unique_ptr<syncer::EntityChange> EntityChangeDeleteFromSpecifics(
    const sync_pb::CollaborationGroupSpecifics& specifics) {
  return syncer::EntityChange::CreateDelete(specifics.collaboration_id(),
                                            syncer::EntityData());
}

MATCHER(NotNullTime, "") {
  return !arg.is_null();
}

MATCHER_P(HasDisplayName, expected_name, "") {
  return arg.display_name == expected_name;
}

MATCHER_P(HasMemberWithGaiaId, expected_gaia_id, "") {
  for (const auto& member : arg.members) {
    if (member.gaia_id == expected_gaia_id) {
      return true;
    }
  }
  return false;
}

MATCHER_P3(GroupEventIs, group_id, event_type, affected_member_gaia_id, "") {
  return arg.group_id == group_id && arg.event_type == event_type &&
         arg.affected_member_gaia_id == affected_member_gaia_id &&
         !arg.event_time.is_null();
}

class MockModelObserver : public GroupDataModel::Observer {
 public:
  MockModelObserver() = default;
  ~MockModelObserver() override = default;

  MOCK_METHOD(void, OnModelLoaded, (), (override));
  MOCK_METHOD(void,
              OnGroupAdded,
              (const GroupId& group_id, const base::Time& event_time),
              (override));
  MOCK_METHOD(void,
              OnGroupUpdated,
              (const GroupId& group_id, const base::Time& event_time),
              (override));
  MOCK_METHOD(void,
              OnGroupDeleted,
              (const GroupId& group_id,
               const std::optional<GroupData>& group_data,
               const base::Time& event_time),
              (override));
  MOCK_METHOD(void,
              OnMemberAdded,
              (const GroupId&, const GaiaId&, const base::Time&),
              (override));
  MOCK_METHOD(void,
              OnMemberRemoved,
              (const GroupId&, const GaiaId&, const base::Time&),
              (override));
  MOCK_METHOD(void, OnSyncBridgeUpdateTypeChanged, (SyncBridgeUpdateType));
};

class GroupDataModelTest : public testing::Test {
 public:
  GroupDataModelTest()
      : data_type_store_(
            syncer::DataTypeStoreTestUtil::CreateInMemoryStoreForTest()) {
    EXPECT_TRUE(data_sharing_dir_.CreateUniqueTempDir());
  }

  ~GroupDataModelTest() override = default;

  void SetUp() override {
    base::RunLoop run_loop;
    ON_CALL(mock_processor_, ModelReadyToSync)
        .WillByDefault(RunClosure(run_loop.QuitClosure()));

    collaboration_group_bridge_ =
        std::make_unique<CollaborationGroupSyncBridge>(
            mock_processor_.CreateForwardingProcessor(),
            syncer::DataTypeStoreTestUtil::FactoryForForwardingStore(
                data_type_store_.get()));
    run_loop.Run();

    // Mimic that initial sync is completed with no data.
    collaboration_group_bridge_->MergeFullSyncData(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        syncer::EntityChangeList());

    model_ = std::make_unique<GroupDataModel>(data_sharing_dir_.GetPath(),
                                              collaboration_group_bridge_.get(),
                                              &sdk_delegate_);
    model_->AddObserver(&observer_);
  }

  void TearDown() override {
    // Needed to ensure that `data_sharing_dir_` outlives DB tasks, that runs on
    // a dedicated sequence.
    ShutdownModel();
  }

  GroupDataModel& model() { return *model_; }

  testing::NiceMock<MockModelObserver>& model_observer() { return observer_; }

  FakeDataSharingSDKDelegate& sdk_delegate() { return sdk_delegate_; }

  CollaborationGroupSyncBridge& collaboration_group_bridge() {
    return *collaboration_group_bridge_;
  }

  void WaitForModelLoaded() {
    if (model_->IsModelLoaded()) {
      return;
    }
    base::RunLoop run_loop;
    EXPECT_CALL(observer_, OnModelLoaded)
        .WillOnce(RunClosure(run_loop.QuitClosure()));
    run_loop.Run();
  }

  GroupId MimicGroupAddedServerSide(const std::string& display_name) {
    const GroupId id = sdk_delegate_.AddGroupAndReturnId(display_name);

    syncer::EntityChangeList entity_changes;
    entity_changes.push_back(EntityChangeAddFromSpecifics(
        MakeSpecifics(id, next_changed_at_millis_since_unix_epoch_++)));
    collaboration_group_bridge_->ApplyIncrementalSyncChanges(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        std::move(entity_changes));

    return id;
  }

  std::vector<GroupId> MimicMultipleGroupsAddedServerSide(
      size_t number_of_groups) {
    syncer::EntityChangeList entity_changes;
    std::vector<GroupId> group_ids;
    for (size_t i = 0; i < number_of_groups; i++) {
      std::string display_name = "Group" + base::NumberToString(i);
      const GroupId id = sdk_delegate_.AddGroupAndReturnId(display_name);
      group_ids.emplace_back(id);

      entity_changes.push_back(EntityChangeAddFromSpecifics(
          MakeSpecifics(id, next_changed_at_millis_since_unix_epoch_++)));
    }

    collaboration_group_bridge_->ApplyIncrementalSyncChanges(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        std::move(entity_changes));

    return group_ids;
  }

  void WaitForGroupAdded(const GroupId& group_id) {
    base::RunLoop run_loop;
    EXPECT_CALL(observer_, OnGroupAdded(group_id, NotNullTime()))
        .WillOnce(RunClosure(run_loop.QuitClosure()));
    run_loop.Run();
  }

  void WaitForMultipleGroupsAdded(size_t number_of_groups) {
    base::RunLoop run_loop;
    size_t call_count = 0;
    EXPECT_CALL(observer_, OnGroupAdded(_, NotNullTime()))
        .Times(::testing::AtLeast(0))
        .WillRepeatedly([&]() {
          ++call_count;
          if (call_count == number_of_groups) {
            run_loop.Quit();
          }
        });
    run_loop.Run();
  }

  void MimicMemberAddedServerSide(const GroupId& group_id,
                                  const GaiaId& member_gaia_id) {
    auto iter = sdk_delegate_.groups()->find(group_id);
    ASSERT_TRUE(iter != sdk_delegate_.groups()->end());

    data_sharing_pb::GroupMember member;
    member.set_gaia_id(member_gaia_id.ToString());
    member.set_role(data_sharing_pb::MEMBER_ROLE_MEMBER);
    member.set_last_updated_time_unix_epoch_millis(
        next_changed_at_millis_since_unix_epoch_++);
    *iter->second.add_members() = member;

    syncer::EntityChangeList entity_changes;
    entity_changes.push_back(EntityChangeUpdateFromSpecifics(
        MakeSpecifics(group_id, next_changed_at_millis_since_unix_epoch_++)));
    collaboration_group_bridge_->ApplyIncrementalSyncChanges(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        std::move(entity_changes));
  }

  void MimicMemberRemovedServerSide(const GroupId& group_id,
                                    const GaiaId& member_gaia_id) {
    sdk_delegate_.RemoveMember(group_id, member_gaia_id);

    auto iter = sdk_delegate_.groups()->find(group_id);
    ASSERT_TRUE(iter != sdk_delegate_.groups()->end());
    data_sharing_pb::GroupMember member;
    member.set_gaia_id(member_gaia_id.ToString());
    member.set_role(data_sharing_pb::MEMBER_ROLE_FORMER_MEMBER);
    member.set_last_updated_time_unix_epoch_millis(
        next_changed_at_millis_since_unix_epoch_++);
    *iter->second.add_former_members() = member;

    syncer::EntityChangeList entity_changes;
    entity_changes.push_back(EntityChangeUpdateFromSpecifics(
        MakeSpecifics(group_id, next_changed_at_millis_since_unix_epoch_++)));
    collaboration_group_bridge_->ApplyIncrementalSyncChanges(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        std::move(entity_changes));
  }

  void WaitForGroupUpdated(const GroupId& group_id) {
    base::RunLoop run_loop;
    EXPECT_CALL(observer_, OnGroupUpdated(group_id, NotNullTime()))
        .WillOnce(RunClosure(run_loop.QuitClosure()));
    run_loop.Run();
  }

  void MimicGroupDeletedServerSide(const GroupId& group_id) {
    sdk_delegate_.RemoveGroup(group_id);

    syncer::EntityChangeList entity_changes;
    entity_changes.push_back(EntityChangeDeleteFromSpecifics(
        MakeSpecifics(group_id, next_changed_at_millis_since_unix_epoch_++)));
    collaboration_group_bridge_->ApplyIncrementalSyncChanges(
        collaboration_group_bridge_->CreateMetadataChangeList(),
        std::move(entity_changes));
  }

  void WaitForGroupDeleted(const GroupId& group_id) {
    // Unlike additions/updates deletions might be handled synchronously, so we
    // need to check whether the group was already deleted.
    std::optional<GroupData> group_data = model().GetGroup(group_id);
    if (!group_data.has_value()) {
      return;
    }
    ASSERT_TRUE(group_data.has_value());

    base::RunLoop run_loop;
    EXPECT_CALL(
        observer_,
        OnGroupDeleted(group_id, OptionalGroupMetadataDataEq(group_data),
                       NotNullTime()))
        .WillOnce(RunClosure(run_loop.QuitClosure()));
    run_loop.Run();
  }

  void ShutdownModel() {
    base::RunLoop run_loop;
    model_->GetGroupDataStoreForTesting().SetShutdownCallbackForTesting(
        run_loop.QuitClosure());
    model_->RemoveObserver(&observer_);
    model_.reset();

    // Wait for DB shutdown tasks completion.
    run_loop.Run();
  }

  void RestartModel() {
    model_ = std::make_unique<GroupDataModel>(data_sharing_dir_.GetPath(),
                                              collaboration_group_bridge_.get(),
                                              &sdk_delegate_);
    model_->AddObserver(&observer_);
  }

  void FastForwardBy(const base::TimeDelta& time_delta) {
    task_environment_.FastForwardBy(time_delta);
  }

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

  base::ScopedTempDir data_sharing_dir_;

  std::unique_ptr<syncer::DataTypeStore> data_type_store_;
  testing::NiceMock<syncer::MockDataTypeLocalChangeProcessor> mock_processor_;
  std::unique_ptr<CollaborationGroupSyncBridge> collaboration_group_bridge_;

  FakeDataSharingSDKDelegate sdk_delegate_;
  std::unique_ptr<GroupDataModel> model_;

  // Used to ensure that changed_at_timestamp_millis_since_unix_epoch is always
  // advanced when changes are made (base::Time::Now() doesn't guarantee that in
  // some cases).
  int64_t next_changed_at_millis_since_unix_epoch_ = 1000;

  testing::NiceMock<MockModelObserver> observer_;
};

TEST_F(GroupDataModelTest, ShouldGetGroup) {
  WaitForModelLoaded();
  EXPECT_FALSE(model().GetGroup(GroupId("non-existing-group-id")).has_value());

  const std::string group_display_name = "group";
  const GroupId group_id = MimicGroupAddedServerSide(group_display_name);
  WaitForGroupAdded(group_id);

  EXPECT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));
}

TEST_F(GroupDataModelTest, ShouldGetAllGroups) {
  WaitForModelLoaded();

  EXPECT_TRUE(model().GetAllGroups().empty());

  const std::string group_display_name1 = "group1";
  const GroupId group_id1 = MimicGroupAddedServerSide(group_display_name1);
  WaitForGroupAdded(group_id1);
  EXPECT_THAT(model().GetAllGroups(),
              ElementsAre(HasDisplayName(group_display_name1)));

  const std::string group_display_name2 = "group2";
  const GroupId group_id2 = MimicGroupAddedServerSide(group_display_name2);
  WaitForGroupAdded(group_id2);
  EXPECT_THAT(model().GetAllGroups(),
              ElementsAre(HasDisplayName(group_display_name1),
                          HasDisplayName(group_display_name2)));
}

TEST_F(GroupDataModelTest, FetchWorksCorrectlyForLargeNumberOfGroups) {
  WaitForModelLoaded();

  EXPECT_TRUE(model().GetAllGroups().empty());

  size_t number_of_groups = 250;
  const std::vector<GroupId> group_ids =
      MimicMultipleGroupsAddedServerSide(number_of_groups);
  ASSERT_EQ(number_of_groups, group_ids.size());
  WaitForMultipleGroupsAdded(number_of_groups);
  EXPECT_EQ(number_of_groups, model().GetAllGroups().size());
  for (const GroupId& group_id : group_ids) {
    EXPECT_TRUE(model().GetGroup(group_id).has_value());
  }
}

TEST_F(GroupDataModelTest, ShouldUpdateGroup) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group");
  WaitForGroupAdded(group_id);

  const GaiaId member_gaia_id("gaia_id");
  MimicMemberAddedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);

  EXPECT_THAT(model().GetGroup(group_id),
              Optional(HasMemberWithGaiaId(member_gaia_id)));
}

TEST_F(GroupDataModelTest, ShouldHandlePartialReadGroupsFailure) {
  WaitForModelLoaded();

  // Both groups are in CollaborationGroupSyncBridge, but only one is in
  // DataSharingSDKDelegate.
  const std::string display_name = "group";
  const GroupId group_id1 = sdk_delegate().AddGroupAndReturnId(display_name);
  const GroupId group_id2 = GroupId("non_existent_group_id");

  syncer::EntityChangeList entity_changes;
  entity_changes.push_back(EntityChangeAddFromSpecifics(
      MakeSpecifics(group_id1, /*changed_at_millis_since_unix_epoch=*/1000)));
  entity_changes.push_back(EntityChangeAddFromSpecifics(
      MakeSpecifics(group_id2, /*changed_at_millis_since_unix_epoch=*/1000)));
  collaboration_group_bridge().ApplyIncrementalSyncChanges(
      collaboration_group_bridge().CreateMetadataChangeList(),
      std::move(entity_changes));

  // First group should be successfully read.
  base::RunLoop run_loop;
  EXPECT_CALL(model_observer(), OnGroupAdded(group_id1, NotNullTime()))
      .WillOnce(RunClosure(run_loop.QuitClosure()));
  run_loop.Run();

  EXPECT_THAT(model().GetGroup(group_id1),
              Optional(HasDisplayName(display_name)));
  EXPECT_FALSE(model().GetGroup(group_id2).has_value());
}

TEST_F(GroupDataModelTest, ShouldNotifyAboutGroupChanges) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group");
  WaitForGroupAdded(group_id);

  // Test that OnMemberAdded() is called when a member is added.
  const GaiaId member_gaia_id("gaia_id");
  EXPECT_CALL(model_observer(),
              OnMemberAdded(group_id, member_gaia_id,
                            base::Time::FromMillisecondsSinceUnixEpoch(1001)));
  MimicMemberAddedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);
  testing::Mock::VerifyAndClearExpectations(&model_observer());

  // Test that OnMemberRemoved() is called when a member is removed.
  EXPECT_CALL(
      model_observer(),
      OnMemberRemoved(group_id, member_gaia_id,
                      base::Time::FromMillisecondsSinceUnixEpoch(1003)));
  MimicMemberRemovedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);
}

TEST_F(GroupDataModelTest,
       ShouldNotifyAboutGroupChanges_MultipleMembersAddedRemoved) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group");
  WaitForGroupAdded(group_id);

  // Test that OnMemberAdded() is called when a member is added.
  const GaiaId member_gaia_id1("gaia_id99");
  EXPECT_CALL(model_observer(),
              OnMemberAdded(group_id, member_gaia_id1,
                            base::Time::FromMillisecondsSinceUnixEpoch(1001)));
  MimicMemberAddedServerSide(group_id, member_gaia_id1);
  WaitForGroupUpdated(group_id);
  testing::Mock::VerifyAndClearExpectations(&model_observer());

  const GaiaId member_gaia_id2("gaia_id2");
  EXPECT_CALL(model_observer(),
              OnMemberAdded(group_id, member_gaia_id2,
                            base::Time::FromMillisecondsSinceUnixEpoch(1003)));
  MimicMemberAddedServerSide(group_id, member_gaia_id2);
  WaitForGroupUpdated(group_id);
  testing::Mock::VerifyAndClearExpectations(&model_observer());

  // Test that OnMemberRemoved() is called when a member is removed.
  EXPECT_CALL(
      model_observer(),
      OnMemberRemoved(group_id, member_gaia_id1,
                      base::Time::FromMillisecondsSinceUnixEpoch(1005)));
  MimicMemberRemovedServerSide(group_id, member_gaia_id1);
  WaitForGroupUpdated(group_id);
}

TEST_F(GroupDataModelTest, ShouldNotifyOnSyncBridgeUpdateTypeChanged) {
  EXPECT_CALL(model_observer(), OnSyncBridgeUpdateTypeChanged(
                                    Eq(SyncBridgeUpdateType::kDisableSync)))
      .Times(1);
  model().OnSyncBridgeUpdateTypeChanged(SyncBridgeUpdateType::kDisableSync);
}

TEST_F(GroupDataModelTest, ShouldDeleteGroup) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group");
  WaitForGroupAdded(group_id);
  std::optional<GroupData> group_data = model().GetGroup(group_id);
  ASSERT_TRUE(group_data.has_value());

  // Unlike additions/updates deletions are handled synchronously, once
  // CollaborationGroupSyncBridge received the update - no need to wait for
  // observer call with RunLoop.
  EXPECT_CALL(model_observer(),
              OnGroupDeleted(group_id, OptionalGroupMetadataDataEq(group_data),
                             NotNullTime()));
  MimicGroupDeletedServerSide(group_id);

  EXPECT_FALSE(model().GetGroup(group_id).has_value());
}

TEST_F(GroupDataModelTest, ShouldPersistDataAcrossRestart) {
  WaitForModelLoaded();

  const std::string group_display_name = "group";
  const GroupId group_id = MimicGroupAddedServerSide(group_display_name);
  WaitForGroupAdded(group_id);
  ASSERT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));

  ShutdownModel();
  RestartModel();
  WaitForModelLoaded();

  EXPECT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));
}

TEST_F(GroupDataModelTest, ShouldHandleNewGroupsAfterRestart) {
  WaitForModelLoaded();
  ShutdownModel();

  // Mimic that new group addition was only partially handled:
  // CollaborationGroupSyncBridge is still running and will persist changes, but
  // model is shut down so it can't process them.
  const std::string group_display_name = "group";
  const GroupId group_id = MimicGroupAddedServerSide(group_display_name);
  RestartModel();
  WaitForModelLoaded();

  WaitForGroupAdded(group_id);
  EXPECT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));
}

TEST_F(GroupDataModelTest, ShouldHandleUpdatesAfterRestart) {
  WaitForModelLoaded();

  const std::string group_display_name = "group";
  const GroupId group_id = MimicGroupAddedServerSide(group_display_name);
  WaitForGroupAdded(group_id);
  ASSERT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));

  // Mimic that new group addition was only partially handled:
  // CollaborationGroupSyncBridge is still running and will persist changes, but
  // model is shut down so it can't process them.
  ShutdownModel();
  const GaiaId member_gaia_id("gaia_id");
  MimicMemberAddedServerSide(group_id, member_gaia_id);

  RestartModel();
  WaitForModelLoaded();

  WaitForGroupUpdated(group_id);
  EXPECT_THAT(model().GetGroup(group_id),
              Optional(HasMemberWithGaiaId(member_gaia_id)));
}

TEST_F(GroupDataModelTest, ShouldHandleDeletionsAfterRestart) {
  WaitForModelLoaded();

  const std::string group_display_name = "group";
  const GroupId group_id = MimicGroupAddedServerSide(group_display_name);
  WaitForGroupAdded(group_id);
  ASSERT_THAT(model().GetGroup(group_id),
              Optional(HasDisplayName(group_display_name)));

  ShutdownModel();
  // Mimic that deletion was only partially handled:
  // CollaborationGroupSyncBridge is still running and will persist changes, but
  // model is shut down so it can't process them.
  MimicGroupDeletedServerSide(group_id);

  RestartModel();
  WaitForModelLoaded();

  EXPECT_FALSE(model().GetGroup(group_id).has_value());
}

TEST_F(GroupDataModelTest, ShouldGetPossiblyRemovedGroupMember) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group");
  WaitForGroupAdded(group_id);

  const GaiaId member_gaia_id("gaia_id");
  MimicMemberAddedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);

  // Existing member should be returned.
  const auto member_data_opt =
      model().GetPossiblyRemovedGroupMember(group_id, member_gaia_id);
  ASSERT_TRUE(member_data_opt.has_value());
  EXPECT_EQ(member_data_opt->gaia_id, member_gaia_id);

  // Group never existed, nullopt should be returned.
  EXPECT_FALSE(model()
                   .GetPossiblyRemovedGroupMember(GroupId("non-existing-group"),
                                                  member_gaia_id)
                   .has_value());

  // Member never existed, nullopt should be returned.
  EXPECT_FALSE(model()
                   .GetPossiblyRemovedGroupMember(group_id,
                                                  GaiaId("non-existing-member"))
                   .has_value());
  // TODO(crbug.com/373628741): add coverage for the scenario when member was
  // removed from the group once it is properly supported (i.e. removed members
  // data is temporarily stored).
}

TEST(GroupDataModelTestNoFixture, ShouldRecordDBInitFailure) {
  base::test::TaskEnvironment task_environment;

  // Boilerplate to create a bridge / SDK delegate (required to create a model,
  // but otherwise not relevant for this test)
  std::unique_ptr<syncer::DataTypeStore> data_type_store(
      syncer::DataTypeStoreTestUtil::CreateInMemoryStoreForTest());
  testing::NiceMock<syncer::MockDataTypeLocalChangeProcessor> mock_processor;
  auto collaboration_group_bridge =
      std::make_unique<CollaborationGroupSyncBridge>(
          mock_processor.CreateForwardingProcessor(),
          syncer::DataTypeStoreTestUtil::FactoryForForwardingStore(
              data_type_store.get()));
  FakeDataSharingSDKDelegate sdk_delegate;

  // Model expects a directory, not a file and this will cause DB init failure.
  base::ScopedTempFile temp_file;
  ASSERT_TRUE(temp_file.Create());

  GroupDataModel model(temp_file.path(), collaboration_group_bridge.get(),
                       &sdk_delegate);

  base::HistogramTester histogram_tester;

  base::RunLoop run_loop;
  model.SetGroupDataStoreLoadedCallbackForTesting(run_loop.QuitClosure());
  run_loop.Run();

  histogram_tester.ExpectUniqueSample("DataSharing.GroupDBInitSuccess", false,
                                      1);
}

TEST_F(GroupDataModelTest, ShouldRecordDBInitSuccess) {
  base::HistogramTester histogram_tester;
  WaitForModelLoaded();
  histogram_tester.ExpectUniqueSample("DataSharing.GroupDBInitSuccess", true,
                                      1);
}

TEST_F(GroupDataModelTest, ShouldRecordGroupEvents) {
  WaitForModelLoaded();

  // Verify that group addition is recorded.
  const GroupId group_id = MimicGroupAddedServerSide("group1");
  WaitForGroupAdded(group_id);

  EXPECT_THAT(model().GetGroupEventsSinceStartup(),
              ElementsAre(GroupEventIs(
                  group_id, GroupEvent::EventType::kGroupAdded, std::nullopt)));

  // Verify that member addition is recorded.
  const GaiaId member_gaia_id("gaia_id");
  MimicMemberAddedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);

  EXPECT_THAT(
      model().GetGroupEventsSinceStartup(),
      ElementsAre(GroupEventIs(group_id, GroupEvent::EventType::kGroupAdded,
                               std::nullopt),
                  GroupEventIs(group_id, GroupEvent::EventType::kMemberAdded,
                               member_gaia_id)));

  // Verify that member removal is recorded.
  MimicMemberRemovedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);

  EXPECT_THAT(
      model().GetGroupEventsSinceStartup(),
      ElementsAre(GroupEventIs(group_id, GroupEvent::EventType::kGroupAdded,
                               std::nullopt),
                  GroupEventIs(group_id, GroupEvent::EventType::kMemberAdded,
                               member_gaia_id),
                  GroupEventIs(group_id, GroupEvent::EventType::kMemberRemoved,
                               member_gaia_id)));

  // Verify that group removal is recorded.
  MimicGroupDeletedServerSide(group_id);
  WaitForGroupDeleted(group_id);

  EXPECT_THAT(
      model().GetGroupEventsSinceStartup(),
      ElementsAre(GroupEventIs(group_id, GroupEvent::EventType::kGroupAdded,
                               std::nullopt),
                  GroupEventIs(group_id, GroupEvent::EventType::kMemberAdded,
                               member_gaia_id),
                  GroupEventIs(group_id, GroupEvent::EventType::kMemberRemoved,
                               member_gaia_id),
                  GroupEventIs(group_id, GroupEvent::EventType::kGroupRemoved,
                               std::nullopt)));
}

TEST_F(GroupDataModelTest, ShouldDoPeriodicPolling) {
  WaitForModelLoaded();

  const GroupId group_id = MimicGroupAddedServerSide("group1");
  WaitForGroupAdded(group_id);

  const GaiaId member_gaia_id("gaia_id");
  MimicMemberAddedServerSide(group_id, member_gaia_id);
  WaitForGroupUpdated(group_id);

  {
    std::optional<GroupData> group_data = model().GetGroup(group_id);
    ASSERT_TRUE(group_data.has_value());
    ASSERT_THAT(*group_data, HasMemberWithGaiaId(member_gaia_id));
  }

  // Mimic that member was removed from the group without updating
  // CollaborationGroup (thus model doesn't know about it).
  sdk_delegate().RemoveMember(group_id, member_gaia_id);
  FastForwardBy(base::Hours(1));
  {
    // One hour is not long enough to trigger periodic polling, so the group
    // member should still be present.
    std::optional<GroupData> group_data = model().GetGroup(group_id);
    ASSERT_TRUE(group_data.has_value());
    ASSERT_THAT(*group_data, HasMemberWithGaiaId(member_gaia_id));
  }
  // There will be extra OnGroupUpdated() call after periodic polling, so to
  // avoid unexpected call errors, verify and clear expectations.
  testing::Mock::VerifyAndClearExpectations(&model_observer());

  base::RunLoop run_loop;
  EXPECT_CALL(model_observer(),
              OnMemberRemoved(group_id, member_gaia_id, NotNullTime()))
      .WillOnce(RunClosure(run_loop.QuitClosure()));
  // Periodic polling is attempted once per hour and only effective for groups
  // that were updated more that kDataSharingGroupDataPeriodicPollingInterval
  // ago, so advance time by the sum of both.
  FastForwardBy(features::kDataSharingGroupDataPeriodicPollingInterval.Get() +
                base::Hours(1));
  run_loop.Run();
  {
    // Now model should be aware of the member removal.
    std::optional<GroupData> group_data = model().GetGroup(group_id);
    ASSERT_TRUE(group_data.has_value());
    EXPECT_TRUE(group_data->members.empty());
  }
}

}  // namespace
}  // namespace data_sharing