// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ash/system/time/calendar_event_list_view.h"

#include <string_view>

#include "ash/calendar/calendar_controller.h"
#include "ash/constants/ash_pref_names.h"
#include "ash/session/session_controller_impl.h"
#include "ash/shell.h"
#include "ash/strings/grit/ash_strings.h"
#include "ash/system/model/system_tray_model.h"
#include "ash/system/time/calendar_event_list_item_view.h"
#include "ash/system/time/calendar_list_model.h"
#include "ash/system/time/calendar_model.h"
#include "ash/system/time/calendar_unittest_utils.h"
#include "ash/system/time/calendar_utils.h"
#include "ash/system/time/calendar_view_controller.h"
#include "ash/test/ash_test_base.h"
#include "base/memory/raw_ptr.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/scoped_feature_list.h"
#include "base/time/time.h"
#include "base/time/time_override.h"
#include "chromeos/ash/components/settings/scoped_timezone_settings.h"
#include "google_apis/calendar/calendar_api_requests.h"
#include "google_apis/common/api_error_codes.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/controls/label.h"
#include "ui/views/controls/scroll_view.h"
#include "ui/views/test/views_test_utils.h"

namespace ash {

namespace {

std::unique_ptr<google_apis::calendar::EventList> CreateMockEventList() {
  auto event_list = std::make_unique<google_apis::calendar::EventList>();
  event_list->set_time_zone("Greenwich Mean Time");
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_0", "summary_0", "18 Nov 2021 8:30 GMT", "18 Nov 2021 9:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_1", "summary_1", "18 Nov 2021 8:15 GMT", "18 Nov 2021 11:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_2", "summary_2", "18 Nov 2021 11:30 GMT", "18 Nov 2021 12:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_3", "", "19 Nov 2021 8:30 GMT", "19 Nov 2021 10:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_4", "summary_4", "21 Nov 2021 8:30 GMT", "21 Nov 2021 9:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_5", "summary_5", "21 Nov 2021 10:30 GMT", "21 Nov 2021 11:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_6", "summary_6", "22 Nov 2021 20:30 GMT", "22 Nov 2021 21:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_7", "summary_7", "22 Nov 2021 23:30 GMT", "23 Nov 2021 0:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_8", "summary_8", "23 Nov 2021 01:30 GMT", "23 Nov 2021 02:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_9", "summary_9", "23 Nov 2021 02:30 GMT", "23 Nov 2021 03:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_10", "summary_10", "23 Nov 2021 03:30 GMT", "23 Nov 2021 04:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_11", "summary_11", "23 Nov 2021 04:30 GMT", "23 Nov 2021 05:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_12", "summary_12", "23 Nov 2021 05:30 GMT", "23 Nov 2021 06:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_13", "summary_13", "23 Nov 2021 06:30 GMT", "23 Nov 2021 07:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_14", "summary_14", "23 Nov 2021 06:30 GMT", "23 Nov 2021 07:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_15", "summary_15", "23 Nov 2021 07:30 GMT", "23 Nov 2021 08:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_16", "summary_16", "23 Nov 2021 08:30 GMT", "23 Nov 2021 09:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_17", "summary_17", "23 Nov 2021 09:30 GMT", "23 Nov 2021 10:30 GMT"));
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_18", "summary_18", "23 Nov 2021 10:30 GMT", "23 Nov 2021 11:30 GMT"));

  return event_list;
}

const char* kCalendarId1 = "user1@email.com";
const char* kCalendarSummary1 = "user1@email.com";
const char* kCalendarColorId1 = "12";
bool kCalendarSelected1 = true;
bool kCalendarPrimary1 = true;

}  // namespace

class CalendarViewEventListViewTest
    : public AshTestBase,
      public testing::WithParamInterface</*multi_calendar_enabled=*/bool> {
 public:
  CalendarViewEventListViewTest() {
    scoped_feature_list_.InitWithFeatureState(
        ash::features::kMultiCalendarSupport, IsMultiCalendarEnabled());
  }
  CalendarViewEventListViewTest(const CalendarViewEventListViewTest&) = delete;
  CalendarViewEventListViewTest& operator=(
      const CalendarViewEventListViewTest&) = delete;
  ~CalendarViewEventListViewTest() override = default;

  void SetUp() override {
    AshTestBase::SetUp();
    controller_ = std::make_unique<CalendarViewController>();
    calendar_model_ = Shell::Get()->system_tray_model()->calendar_model();
    widget_ = CreateFramelessTestWidget();
    widget_->SetFullscreen(true);
  }

  void TearDown() override {
    event_list_view_.reset();
    controller_.reset();
    scoped_feature_list_.Reset();
    widget_.reset();
    calendar_model_ = nullptr;

    AshTestBase::TearDown();
  }

  bool IsMultiCalendarEnabled() { return GetParam(); }

  void CreateEventListView(base::Time date) {
    event_list_view_.reset();
    controller_->UpdateMonth(date);
    calendar_model_->OnEventsFetched(calendar_utils::GetStartOfMonthUTC(date),
                                     google_apis::calendar::kPrimaryCalendarId,
                                     google_apis::ApiErrorCode::HTTP_SUCCESS,
                                     CreateMockEventList().get());
    controller_->selected_date_ = date;
    event_list_view_ =
        std::make_unique<CalendarEventListView>(controller_.get());
    widget_->SetContentsView(event_list_view_.get());
  }

  void SetSelectedDate(base::Time date) {
    controller_->selected_date_ = date;
    controller_->ShowEventListView(/*calendar_date_cell_view=*/nullptr, date,
                                   /*row_index=*/0);
  }

  void UpdateEventList() { event_list_view_->UpdateListItems(); }

  // The way we send metrics is slightly different for Jelly so we need to
  // ensure this value is set to true in the controller.
  void SetEventListIsShowingForMetrics() {
    controller_->is_event_list_showing_ = true;
  }

  CalendarEventListView* event_list_view() { return event_list_view_.get(); }
  views::View* content_view() { return event_list_view_->content_view_; }
  views::ScrollView* scroll_view() { return event_list_view_->scroll_view_; }
  CalendarViewController* controller() { return controller_.get(); }
  int current_or_next_event_index() {
    return event_list_view_->current_or_next_event_index_;
  }

  views::View* GetSameDayEventsContainer() {
    views::View* container =
        content_view()->GetViewByID(kEventListSameDayEventsContainer);
    CHECK(container);

    return container;
  }

  views::Label* GetSummary(int child_index) {
    return static_cast<views::Label*>(
        static_cast<CalendarEventListItemView*>(
            GetSameDayEventsContainer()->children()[child_index])
            ->GetViewByID(kSummaryLabelID));
  }

  std::u16string_view GetEmptyLabel() {
    return static_cast<views::LabelButton*>(
               content_view()->children()[0]->children()[0])
        ->GetText();
  }

  views::View* GetHighlightView(int child_index) {
    return GetSameDayEventsContainer()->children()[child_index];
  }

  size_t GetContentViewSize() {
    return GetSameDayEventsContainer()->children().size();
  }

  size_t GetEmptyContentViewSize() { return content_view()->children().size(); }

  static base::Time FakeTimeNow() { return fake_time_; }
  static void SetFakeNow(base::Time fake_now) { fake_time_ = fake_now; }

 private:
  std::unique_ptr<views::Widget> widget_;
  std::unique_ptr<calendar_test_utils::CalendarClientTestImpl> calendar_client_;
  raw_ptr<CalendarModel> calendar_model_ = nullptr;
  std::unique_ptr<CalendarEventListView> event_list_view_;
  std::unique_ptr<CalendarViewController> controller_;
  base::test::ScopedFeatureList scoped_feature_list_;
  static base::Time fake_time_;
};

base::Time CalendarViewEventListViewTest::fake_time_;

INSTANTIATE_TEST_SUITE_P(MultiCalendar,
                         CalendarViewEventListViewTest,
                         testing::Bool());

TEST_P(CalendarViewEventListViewTest, ShowEvents) {
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 10:00 GMT", &date));

  CreateEventListView(date - base::Days(1));

  // No events on 17 Nov 2021, so we see the empty list default.
  EXPECT_EQ(1u, GetEmptyContentViewSize());
  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_ASH_CALENDAR_NO_EVENTS),
            GetEmptyLabel());

  SetSelectedDate(date);

  // 3 events on 18 Nov 2021. And they should be sorted by the start time.
  EXPECT_EQ(3u, GetContentViewSize());
  EXPECT_EQ(u"summary_1", GetSummary(0)->GetText());
  EXPECT_EQ(u"summary_0", GetSummary(1)->GetText());
  EXPECT_EQ(u"summary_2", GetSummary(2)->GetText());

  SetSelectedDate(date + base::Days(1));

  // 1 event on 19 Nov 2021. For no title mettings, shows "No title" as the
  // meeting summary.
  EXPECT_EQ(1u, GetContentViewSize());
  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_ASH_CALENDAR_NO_TITLE),
            GetSummary(0)->GetText());

  SetSelectedDate(date + base::Days(2));

  // 0 event on 20 Nov 2021.
  EXPECT_EQ(1u, GetEmptyContentViewSize());
  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_ASH_CALENDAR_NO_EVENTS),
            GetEmptyLabel());

  SetSelectedDate(date + base::Days(3));

  // 2 events on 21 Nov 2021.
  EXPECT_EQ(2u, GetContentViewSize());
  EXPECT_EQ(u"summary_4", GetSummary(0)->GetText());
  EXPECT_EQ(u"summary_5", GetSummary(1)->GetText());
}

TEST_P(CalendarViewEventListViewTest, LaunchEmptyList) {
  base::HistogramTester histogram_tester;
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 10:00 GMT", &date));
  CreateEventListView(date - base::Days(1));

  // No events, so we see the empty list by default.
  EXPECT_EQ(1u, GetEmptyContentViewSize());
  views::Button* empty_list_button =
      static_cast<views::Button*>(content_view()->children()[0]->children()[0]);
  empty_list_button->AcceleratorPressed(
      ui::Accelerator(ui::KeyboardCode::VKEY_SPACE, /*modifiers=*/0));

  histogram_tester.ExpectTotalCount(
      "Ash.Calendar.UserJourneyTime.EventLaunched", 1);
  EXPECT_EQ(histogram_tester.GetTotalSum(
                "Ash.Calendar.EventListViewJelly.EventDisplayedCount"),
            0);
}

TEST_P(CalendarViewEventListViewTest, LaunchItem) {
  base::HistogramTester histogram_tester;
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 10:00 GMT", &date));
  CreateEventListView(date);
  SetEventListIsShowingForMetrics();
  EXPECT_EQ(3u, GetContentViewSize());

  // Launch the first item.
  views::View* first_item = GetHighlightView(0);
  first_item->AcceleratorPressed(
      ui::Accelerator(ui::KeyboardCode::VKEY_SPACE, /*modifiers=*/0));

  histogram_tester.ExpectTotalCount(
      "Ash.Calendar.UserJourneyTime.EventLaunched", 1);
  histogram_tester.ExpectTotalCount("Ash.Calendar.EventListItem.Activated", 1);
  EXPECT_EQ(histogram_tester.GetTotalSum(
                "Ash.Calendar.EventListViewJelly.EventDisplayedCount"),
            3);
}

TEST_P(CalendarViewEventListViewTest, ScrollToCurrentOrNextEvent) {
  // Sets the timezone to GMT. Otherwise in other timezones events can become
  // multi-day events that will be ignored when calculating index.
  ash::system::ScopedTimezoneSettings timezone_settings(u"GMT");

  // Sets today to be a day with many events, so `event_list_view()` is
  // scrollable.
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("23 Nov 2021 08:00 GMT", &date));
  CreateEventListView(date);

  SetSelectedDate(date);

  // Sets the current time to be a time that event id_9 has started.
  base::Time current_time;
  ASSERT_TRUE(base::Time::FromString("23 Nov 2021 02:40 GMT", &current_time));
  SetFakeNow(current_time);
  base::subtle::ScopedTimeClockOverrides time_override(
      &CalendarViewEventListViewTest::FakeTimeNow,
      /*time_ticks_override=*/nullptr, /*thread_ticks_override=*/nullptr);
  UpdateEventList();
  views::test::RunScheduledLayout(event_list_view());

  // The current or next event should be the second event(event id_9).
  EXPECT_EQ(1, current_or_next_event_index());

  // The top of `scroll_view()` visible rect should be the same with the top of
  // the current or next event.
  auto scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  auto current_item_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_EQ(scroll_view_visible_bounds.y(), current_item_bounds.y());
}

TEST_P(CalendarViewEventListViewTest,
       DoNotScrollToCurrentOrNextEventWhenFocused) {
  // Sets the timezone to GMT. Otherwise in other timezones events can become
  // multi-day events that will be ignored when calculating index.
  ash::system::ScopedTimezoneSettings timezone_settings(u"GMT");

  // Sets today to be a day with many events, so `event_list_view()` is
  // scrollable.
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("23 Nov 2021 08:00 GMT", &date));
  CreateEventListView(date);

  SetSelectedDate(date);

  // Sets the current time to be a time that event id_9 has started.
  base::Time current_time;
  ASSERT_TRUE(base::Time::FromString("23 Nov 2021 02:40 GMT", &current_time));
  SetFakeNow(current_time);
  base::subtle::ScopedTimeClockOverrides time_override(
      &CalendarViewEventListViewTest::FakeTimeNow,
      /*time_ticks_override=*/nullptr, /*thread_ticks_override=*/nullptr);
  UpdateEventList();
  views::test::RunScheduledLayout(event_list_view());

  // The current or next event should be the second event(event id_9).
  EXPECT_EQ(1, current_or_next_event_index());

  // The top of `scroll_view()` visible rect should be the same with the top of
  // the current or next event.
  auto scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  auto current_item_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_EQ(scroll_view_visible_bounds.y(), current_item_bounds.y());

  // Focus on first item in `event_list_view()`, and `scroll_view()` should
  // scroll up along with the focus change.
  GetHighlightView(0)->RequestFocus();
  views::test::RunScheduledLayout(event_list_view());

  scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  current_item_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_LT(scroll_view_visible_bounds.y(), current_item_bounds.y());
}

TEST_P(CalendarViewEventListViewTest,
       ScrollToCurrentOrNextEvent_WithMultiDayEvents) {
  // Sets the timezone to HST. The first two events become multi-day events, and
  // will be ignored when calculating index.
  ash::system::ScopedTimezoneSettings timezone_settings(u"Pacific/Honolulu");

  // Sets the current time in HST to make today 18 Nov in local time.
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 8:10 HST", &date));
  CreateEventListView(date);

  SetSelectedDate(date);

  // Sets the current time to be a time that event id_2 has started.
  base::Time current_time;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 11:40 GMT", &current_time));
  SetFakeNow(current_time);
  base::subtle::ScopedTimeClockOverrides time_override(
      &CalendarViewEventListViewTest::FakeTimeNow,
      /*time_ticks_override=*/nullptr, /*thread_ticks_override=*/nullptr);
  UpdateEventList();

  // The current or next event should be the first event with id_2 since the
  // first two events are multi-day events.
  EXPECT_EQ(0, current_or_next_event_index());

  // The top of `scroll_view()` visible rect should be the same with the top of
  // the current or next event.
  auto scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  auto current_item_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_EQ(scroll_view_visible_bounds.y(), current_item_bounds.y());
}

TEST_P(CalendarViewEventListViewTest,
       ScrollToCurrentOrNextEvent_PassedDatesStayAtTop) {
  // Sets the timezone to GMT. Otherwise in other timezones events can become
  // multi-day events that will be ignored when calculating index.
  ash::system::ScopedTimezoneSettings timezone_settings(u"GMT");

  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 8:10 GMT", &date));
  CreateEventListView(date);

  SetSelectedDate(date);

  // Sets the current time to be a time that all events for today have passed.
  base::Time current_time;
  ASSERT_TRUE(base::Time::FromString("19 Nov 2021 11:40 GMT", &current_time));
  SetFakeNow(current_time);
  base::subtle::ScopedTimeClockOverrides time_override(
      &CalendarViewEventListViewTest::FakeTimeNow,
      /*time_ticks_override=*/nullptr, /*thread_ticks_override=*/nullptr);
  UpdateEventList();
  views::test::RunScheduledLayout(event_list_view());

  // The current or next event should be the default value.
  EXPECT_EQ(0, current_or_next_event_index());

  // The `scroll_view()` should stay at the top of the list.
  auto scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  auto list_top_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_EQ(scroll_view_visible_bounds.y(), list_top_bounds.y());
}

TEST_P(CalendarViewEventListViewTest,
       ScrollToCurrentOrNextEvent_FutureDatesStaysAtTop) {
  // Sets the timezone to GMT. Otherwise in other timezones events can become
  // multi-day events that will be ignored when calculating index.
  ash::system::ScopedTimezoneSettings timezone_settings(u"GMT");

  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 8:10 GMT", &date));
  CreateEventListView(date);

  SetSelectedDate(date);

  // Sets the current time to be a time before today.
  base::Time current_time;
  ASSERT_TRUE(base::Time::FromString("17 Nov 2021 11:40 GMT", &current_time));
  SetFakeNow(current_time);
  base::subtle::ScopedTimeClockOverrides time_override(
      &CalendarViewEventListViewTest::FakeTimeNow,
      /*time_ticks_override=*/nullptr, /*thread_ticks_override=*/nullptr);
  UpdateEventList();
  views::test::RunScheduledLayout(event_list_view());

  // The current or next event should be the first event.
  EXPECT_EQ(0, current_or_next_event_index());

  // The `scroll_view()` should stay at the top of the list.
  auto scroll_view_visible_bounds = scroll_view()->GetVisibleBounds();
  views::View::ConvertRectToScreen(scroll_view(), &scroll_view_visible_bounds);
  auto first_item_bounds =
      GetHighlightView(current_or_next_event_index())->GetBoundsInScreen();
  EXPECT_EQ(scroll_view_visible_bounds.y(), first_item_bounds.y());
}

class CalendarViewEventListViewFetchTest
    : public AshTestBase,
      public testing::WithParamInterface</*multi_calendar_enabled=*/bool> {
 public:
  CalendarViewEventListViewFetchTest()
      : AshTestBase(base::test::TaskEnvironment::TimeSource::MOCK_TIME) {
    scoped_feature_list_.InitWithFeatureState(
        ash::features::kMultiCalendarSupport, IsMultiCalendarEnabled());
  }
  CalendarViewEventListViewFetchTest(
      const CalendarViewEventListViewFetchTest&) = delete;
  CalendarViewEventListViewFetchTest& operator=(
      const CalendarViewEventListViewFetchTest&) = delete;
  ~CalendarViewEventListViewFetchTest() override = default;

  void SetUp() override {
    AshTestBase::SetUp();

    // Register a mock `CalendarClient` to the `CalendarController`.
    const std::string email = "user1@email.com";
    account_id_ = AccountId::FromUserEmail(email);
    Shell::Get()->calendar_controller()->SetActiveUserAccountIdForTesting(
        account_id_);
    calendar_model_ = Shell::Get()->system_tray_model()->calendar_model();
    calendar_client_ =
        std::make_unique<calendar_test_utils::CalendarClientTestImpl>();
    controller_ = std::make_unique<CalendarViewController>();
    Shell::Get()->calendar_controller()->RegisterClientForUser(
        account_id_, calendar_client_.get());
    Shell::Get()->session_controller()->GetActivePrefService()->SetBoolean(
        ash::prefs::kCalendarIntegrationEnabled, true);
  }

  void TearDown() override {
    event_list_view_.reset();
    controller_.reset();
    scoped_feature_list_.Reset();
    time_overrides_.reset();
    calendar_model_ = nullptr;

    AshTestBase::TearDown();
  }

  bool IsMultiCalendarEnabled() { return GetParam(); }

  void WaitUntilFetched() {
    task_environment()->FastForwardBy(base::Minutes(1));
    base::RunLoop().RunUntilIdle();
  }

  void CreateEventListView(base::Time date) {
    event_list_view_.reset();
    controller_->UpdateMonth(date);
    calendar_model_->OnEventsFetched(calendar_utils::GetStartOfMonthUTC(date),
                                     google_apis::calendar::kPrimaryCalendarId,
                                     google_apis::ApiErrorCode::HTTP_SUCCESS,
                                     CreateMockEventList().get());
    controller_->selected_date_ = date;
    event_list_view_ =
        std::make_unique<CalendarEventListView>(controller_.get());
  }

  void SetCalendarList() {
    // Sets a mock calendar list.
    std::list<std::unique_ptr<google_apis::calendar::SingleCalendar>> calendars;
    calendars.push_back(calendar_test_utils::CreateCalendar(
        kCalendarId1, kCalendarSummary1, kCalendarColorId1, kCalendarSelected1,
        kCalendarPrimary1));
    calendar_client_->SetCalendarList(
        calendar_test_utils::CreateMockCalendarList(std::move(calendars)));
  }

  void SetEventList(std::unique_ptr<google_apis::calendar::EventList> events) {
    calendar_client_->SetEventList(std::move(events));
  }

  void FetchCalendars() {
    Shell::Get()->system_tray_model()->calendar_list_model()->FetchCalendars();
    WaitUntilFetched();
  }

  void RefetchEvents(base::Time start_of_month) {
    calendar_model_->FetchEvents(start_of_month);
    WaitUntilFetched();
  }

  void SetTodayFromTime(base::Time date) {
    std::set<base::Time> months = calendar_utils::GetSurroundingMonthsUTC(
        date, calendar_utils::kNumSurroundingMonthsCached);

    calendar_model_->non_prunable_months_.clear();
    // Non-prunable months are today's date and the two surrounding months.
    calendar_model_->AddNonPrunableMonths(months);
  }

  void SetSelectedDate(base::Time date) {
    controller_->selected_date_ = date;
    controller_->ShowEventListView(/*calendar_date_cell_view=*/nullptr, date,
                                   /*row_index=*/0);
  }

  void UpdateEventList() { event_list_view_->UpdateListItems(); }

  views::View* content_view() { return event_list_view_->content_view_; }
  CalendarViewController* controller() { return controller_.get(); }

  views::View* GetSameDayEventsContainer() {
    views::View* container =
        content_view()->GetViewByID(kEventListSameDayEventsContainer);
    CHECK(container);

    return container;
  }

  views::Label* GetSummary(int child_index) {
    return static_cast<views::Label*>(
        static_cast<CalendarEventListItemView*>(
            GetSameDayEventsContainer()->children()[child_index])
            ->GetViewByID(kSummaryLabelID));
  }

  std::u16string_view GetEmptyLabel() {
    return static_cast<views::LabelButton*>(
               content_view()->children()[0]->children()[0])
        ->GetText();
  }

  size_t GetContentViewSize() {
    return GetSameDayEventsContainer()->children().size();
  }

  size_t GetEmptyContentViewSize() { return content_view()->children().size(); }

 private:
  std::unique_ptr<base::subtle::ScopedTimeClockOverrides> time_overrides_;
  std::unique_ptr<views::Widget> widget_;
  std::unique_ptr<calendar_test_utils::CalendarClientTestImpl> calendar_client_;
  raw_ptr<CalendarModel> calendar_model_ = nullptr;
  std::unique_ptr<CalendarEventListView> event_list_view_;
  std::unique_ptr<CalendarViewController> controller_;
  base::test::ScopedFeatureList scoped_feature_list_;
  AccountId account_id_;
};

INSTANTIATE_TEST_SUITE_P(MultiCalendar,
                         CalendarViewEventListViewFetchTest,
                         testing::Bool());

TEST_P(CalendarViewEventListViewFetchTest, RefreshEvents) {
  base::Time date;
  ASSERT_TRUE(base::Time::FromString("18 Nov 2021 10:00 GMT", &date));
  CreateEventListView(date);

  SetSelectedDate(date);
  SetTodayFromTime(date);

  // With the initial event list there should be 3 events on the 18th.
  EXPECT_EQ(3u, GetContentViewSize());

  if (IsMultiCalendarEnabled()) {
    // Set and fetch a calendar list so FetchEvents can create an event fetch.
    SetCalendarList();
    FetchCalendars();
  }

  base::Time start_of_month = calendar_utils::GetStartOfMonthUTC(
      controller()->selected_date_midnight());
  auto event_list = std::make_unique<google_apis::calendar::EventList>();
  event_list->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_4", "summary_4", "21 Nov 2021 8:30 GMT", "21 Nov 2021 9:30 GMT"));
  SetEventList(std::move(event_list));

  // Calls the `FetchEvents` method to update the events in the model.
  // The event list view should be re-rendered automatically with the new event
  // list.
  RefetchEvents(start_of_month);

  // Shows 0 events and shows open in google calendar button after the refresh.
  EXPECT_EQ(1u, GetEmptyContentViewSize());
  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_ASH_CALENDAR_NO_EVENTS),
            GetEmptyLabel());

  auto event_list2 = std::make_unique<google_apis::calendar::EventList>();
  event_list2->InjectItemForTesting(calendar_test_utils::CreateEvent(
      "id_0", "summary_0", "18 Nov 2021 8:30 GMT", "18 Nov 2021 9:30 GMT"));
  SetEventList(std::move(event_list2));

  RefetchEvents(start_of_month);

  // Shows 1 event after the refresh.
  EXPECT_EQ(1u, GetContentViewSize());
  EXPECT_EQ(u"summary_0", GetSummary(0)->GetText());
}

}  // namespace ash