// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <linux/input.h>
#include <wayland-server.h>

#include <memory>
#include <string>
#include <vector>

#include "base/bind.h"
#include "base/containers/contains.h"
#include "base/containers/flat_set.h"
#include "base/pickle.h"
#include "base/strings/utf_string_conversions.h"
#include "base/test/bind.h"
#include "build/chromeos_buildflags.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/base/clipboard/clipboard_constants.h"
#include "ui/base/clipboard/clipboard_format_type.h"
#include "ui/base/clipboard/file_info.h"
#include "ui/base/cursor/cursor.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/dragdrop/os_exchange_data_provider_factory.h"
#include "ui/events/base_event_utils.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/ozone/platform/wayland/common/data_util.h"
#include "ui/ozone/platform/wayland/host/wayland_connection.h"
#include "ui/ozone/platform/wayland/host/wayland_data_device.h"
#include "ui/ozone/platform/wayland/host/wayland_data_device_manager.h"
#include "ui/ozone/platform/wayland/host/wayland_data_drag_controller.h"
#include "ui/ozone/platform/wayland/host/wayland_data_source.h"
#include "ui/ozone/platform/wayland/host/wayland_window.h"
#include "ui/ozone/platform/wayland/test/mock_surface.h"
#include "ui/ozone/platform/wayland/test/test_data_device.h"
#include "ui/ozone/platform/wayland/test/test_data_device_manager.h"
#include "ui/ozone/platform/wayland/test/test_data_offer.h"
#include "ui/ozone/platform/wayland/test/test_data_source.h"
#include "ui/ozone/platform/wayland/test/test_keyboard.h"
#include "ui/ozone/platform/wayland/test/test_wayland_server_thread.h"
#include "ui/ozone/platform/wayland/test/wayland_drag_drop_test.h"
#include "ui/ozone/platform/wayland/test/wayland_test.h"
#include "ui/ozone/public/platform_clipboard.h"
#include "ui/platform_window/platform_window_init_properties.h"
#include "ui/platform_window/wm/wm_drag_handler.h"
#include "ui/platform_window/wm/wm_drop_handler.h"
#include "url/gurl.h"

using ::testing::_;
using ::testing::Eq;
using ::testing::Mock;
using ::testing::Values;
using ui::mojom::DragEventSource;
using ui::mojom::DragOperation;

namespace ui {
namespace {

constexpr char kSampleTextForDragAndDrop[] =
    "This is a sample text for drag-and-drop.";
constexpr char16_t kSampleTextForDragAndDrop16[] =
    u"This is a sample text for drag-and-drop.";

constexpr FilenameToURLPolicy kFilenameToURLPolicy =
    FilenameToURLPolicy::CONVERT_FILENAMES;

template <typename StringType>
PlatformClipboard::Data ToClipboardData(const StringType& data_string) {
  auto* begin = reinterpret_cast<typename std::vector<uint8_t>::const_pointer>(
      data_string.data());
  std::vector<uint8_t> result(
      begin,
      begin + (data_string.size() * sizeof(typename StringType::value_type)));
  return scoped_refptr<base::RefCountedBytes>(
      base::RefCountedBytes::TakeVector(&result));
}

}  // namespace

class MockDragHandlerDelegate : public WmDragHandler::Delegate {
 public:
  MOCK_METHOD1(OnDragLocationChanged, void(const gfx::Point& location));
  MOCK_METHOD1(OnDragOperationChanged, void(DragOperation operation));
  MOCK_METHOD1(OnDragFinished, void(DragOperation operation));
};

class MockDropHandler : public WmDropHandler {
 public:
  MockDropHandler() = default;
  ~MockDropHandler() override = default;

  MOCK_METHOD0(MockOnDragEnter, void());
  MOCK_METHOD3(MockDragMotion,
               int(const gfx::PointF& point, int operation, int modifiers));
  MOCK_METHOD0(MockOnDragDrop, void());
  MOCK_METHOD0(OnDragLeave, void());

  void SetOnDropClosure(base::RepeatingClosure closure) {
    on_drop_closure_ = closure;
  }

  void SetPreferredOperations(int preferred_operations) {
    preferred_operations_ = preferred_operations;
  }

  OSExchangeData* dropped_data() { return dropped_data_.get(); }

  int available_operations() const { return available_operations_; }

 protected:
  void OnDragEnter(const gfx::PointF& point,
                   std::unique_ptr<ui::OSExchangeData> data,
                   int operation,
                   int modifiers) override {
    dropped_data_ = std::move(data);
    MockOnDragEnter();
  }
  void OnDragDrop(std::unique_ptr<OSExchangeData> data,
                  int modifiers) override {
    MockOnDragDrop();
    on_drop_closure_.Run();
    on_drop_closure_.Reset();
  }

  int OnDragMotion(const gfx::PointF& point,
                   int operation,
                   int modifiers) override {
    available_operations_ = operation;
    MockDragMotion(point, operation, modifiers);
    return preferred_operations_;
  }

 private:
  base::RepeatingClosure on_drop_closure_;

  std::unique_ptr<OSExchangeData> dropped_data_;
  int preferred_operations_ = ui::DragDropTypes::DRAG_COPY;
  int available_operations_ = ui::DragDropTypes::DRAG_NONE;
};

class WaylandDataDragControllerTest : public WaylandDragDropTest {
 public:
  WaylandDataDragControllerTest() = default;
  ~WaylandDataDragControllerTest() override = default;

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

    drag_handler_delegate_ = std::make_unique<MockDragHandlerDelegate>();
    drop_handler_ = std::make_unique<MockDropHandler>();
    SetWmDropHandler(window_.get(), drop_handler_.get());
  }

  WaylandDataDragController* drag_controller() const {
    return connection_->data_drag_controller();
  }

  WaylandDataDevice* data_device() const {
    return connection_->data_device_manager()->GetDevice();
  }

  MockDropHandler* drop_handler() { return drop_handler_.get(); }

  MockDragHandlerDelegate* drag_handler() {
    return drag_handler_delegate_.get();
  }

  wl::MockSurface* GetMockSurface(uint32_t id) {
    return server_.GetObject<wl::MockSurface>(id);
  }

  WaylandConnection* connection() { return connection_.get(); }

  WaylandWindow* window() { return window_.get(); }

  std::u16string sample_text_for_dnd() const {
    return kSampleTextForDragAndDrop16;
  }

  void RunMouseDragWithSampleData(WaylandWindow* origin_window,
                                  int operations) {
    ASSERT_TRUE(origin_window);
    OSExchangeData os_exchange_data;
    os_exchange_data.SetString(sample_text_for_dnd());
    origin_window->StartDrag(
        os_exchange_data, operations, DragEventSource::kMouse, /*cursor=*/{},
        /*can_grab_pointer=*/true, drag_handler_delegate_.get());
    Sync();
  }

  std::unique_ptr<WaylandWindow> CreateTestWindow(
      PlatformWindowType type,
      const gfx::Size& size,
      MockPlatformWindowDelegate* delegate,
      gfx::AcceleratedWidget context) {
    DCHECK(delegate);
    PlatformWindowInitProperties properties{gfx::Rect(size)};
    properties.type = type;
    properties.parent_widget = context;
    EXPECT_CALL(*delegate, OnAcceleratedWidgetAvailable(_)).Times(1);
    auto window = WaylandWindow::Create(delegate, connection_.get(),
                                        std::move(properties));
    SetWmDropHandler(window.get(), drop_handler_.get());
    EXPECT_NE(gfx::kNullAcceleratedWidget, window->GetWidget());
    Sync();
    return window;
  }

  void ScheduleDragCancel() {
    ScheduleTestTask(base::BindOnce(
        [](WaylandDataDragControllerTest* self) {
          self->SendDndCancelled();

          // DnD handlers expect DragLeave to be sent before DragFinished when
          // drag sessions end up with no data transfer (cancelled). Otherwise,
          // it might lead to issues like https://crbug.com/1109324.
          EXPECT_CALL(*self->drop_handler(), OnDragLeave).Times(1);
          // If DnD was cancelled, or data was dropped where it was not
          // accepted, the operation result must be None (0).
          // Regression test for https://crbug.com/1136751.
          EXPECT_CALL(*self->drag_handler(),
                      OnDragFinished(DragOperation::kNone))
              .Times(1);

          self->Sync();
        },
        base::Unretained(this)));
  }

  void FocusAndPressLeftPointerButton(WaylandWindow* window,
                                      MockPlatformWindowDelegate* delegate) {
    SendPointerEnter(window, delegate);
    SendPointerButton(window, delegate, BTN_LEFT, /*pressed=*/true);
    Sync();
  }

  MockPlatformWindowDelegate* delegate() { return &delegate_; }

 protected:
  std::unique_ptr<MockDropHandler> drop_handler_;
  std::unique_ptr<MockDragHandlerDelegate> drag_handler_delegate_;
};

TEST_P(WaylandDataDragControllerTest, StartDrag) {
  const bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  auto test = [](WaylandDataDragControllerTest* self) {
    // Now the server can read the data and give it to our callback.
    base::RunLoop run_loop(base::RunLoop::Type::kNestableTasksAllowed);
    auto read_callback = base::BindOnce(
        [](base::RunLoop* loop, std::vector<uint8_t>&& data) {
          std::string result(data.begin(), data.end());
          EXPECT_EQ(kSampleTextForDragAndDrop, result);
          loop->Quit();
        },
        &run_loop);
    self->ReadData(kMimeTypeTextUtf8, std::move(read_callback));
    run_loop.Run();

    self->SendDndCancelled();
    self->Sync();
  };

  // Post test task to be performed asynchronously once the dnd-related protocol
  // objects are ready.
  ScheduleTestTask(base::BindOnce(test, base::Unretained(this)));

  RunMouseDragWithSampleData(
      window_.get(), DragDropTypes::DRAG_COPY | DragDropTypes::DRAG_MOVE);

  // Ensure drag delegate it properly reset when the drag loop quits.
  EXPECT_FALSE(data_device()->drag_delegate_);

  window_->SetPointerFocus(restored_focus);
}

TEST_P(WaylandDataDragControllerTest, StartDragWithWrongMimeType) {
  bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  // The client starts dragging offering data with |kMimeTypeHTML|
  OSExchangeData os_exchange_data;
  os_exchange_data.SetHtml(sample_text_for_dnd(), {});
  int operations = DragDropTypes::DRAG_COPY | DragDropTypes::DRAG_MOVE;
  drag_controller()->StartSession(os_exchange_data, operations,
                                  DragEventSource::kMouse);
  Sync();

  // The server should get an empty data buffer in ReadData callback when trying
  // to read it with a different mime type.
  base::RunLoop run_loop;
  auto callback = base::BindOnce(
      [](base::RunLoop* loop, std::vector<uint8_t>&& data) {
        std::string result(data.begin(), data.end());
        EXPECT_TRUE(result.empty());
        loop->Quit();
      },
      &run_loop);
  data_device_manager_->data_source()->ReadData(kMimeTypeText,
                                                std::move(callback));
  run_loop.Run();
  window_->SetPointerFocus(restored_focus);
}

// Ensures data drag controller properly offers dragged data with custom
// formats. Regression test for a bunch of bugs, such as:
//  - https://crbug.com/1236708
//  - https://crbug.com/1207607
//  - https://crbug.com/1247063
TEST_P(WaylandDataDragControllerTest, StartDragWithCustomFormats) {
  bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);
  OSExchangeData data(OSExchangeDataProviderFactory::CreateProvider());

  // TODO(crbug.com/1247063): Add more custom formats once generic mechanism for
  // retrieving mime types is implemented.
  ClipboardFormatType kCustomFormats[] = {
      ClipboardFormatType::WebCustomDataType(),
      ClipboardFormatType::GetType("chromium/x-bookmark-entries")};
  for (auto format : kCustomFormats)
    data.SetPickledData(format, {});

  // The client starts dragging offering pickled data with custom formats.
  drag_controller()->StartSession(data, DragDropTypes::DRAG_MOVE,
                                  DragEventSource::kMouse);
  Sync();

  ASSERT_TRUE(data_device_manager_->data_source());
  auto mime_types = data_device_manager_->data_source()->mime_types();
  EXPECT_EQ(1u, mime_types.size());

  for (auto format : kCustomFormats) {
    // TODO(crbug.com/1247063): Double-check whether offering custom format name
    // is not enough here. For now, for webui tab drag, format is extracted from
    // the pickled data and used as mime type at Wayland protocol level.
    if (format == ClipboardFormatType::WebCustomDataType())
      continue;

    EXPECT_TRUE(base::Contains(mime_types, format.GetName()))
        << "Format '" << format.GetName() << "' should be offered.";
  }

  window_->SetPointerFocus(restored_focus);
}

TEST_P(WaylandDataDragControllerTest, StartDragWithText) {
  bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  // The client starts dragging offering text mime type.
  OSExchangeData os_exchange_data;
  os_exchange_data.SetString(sample_text_for_dnd());
  int operations = DragDropTypes::DRAG_COPY | DragDropTypes::DRAG_MOVE;
  drag_controller()->StartSession(os_exchange_data, operations,
                                  DragEventSource::kMouse);
  Sync();

  // The server should get a "text" representation in ReadData callback when
  // trying to read it as mime type other than |kMimeTypeText| and
  // |kTextMimeTypeUtf8|.
  base::RunLoop run_loop;
  auto callback = base::BindOnce(
      [](base::RunLoop* loop, std::vector<uint8_t>&& data) {
        std::string result(data.begin(), data.end());
        EXPECT_EQ(kSampleTextForDragAndDrop, result);
        loop->Quit();
      },
      &run_loop);
  data_device_manager_->data_source()->ReadData(kMimeTypeMozillaURL,
                                                std::move(callback));
  run_loop.Run();
  window_->SetPointerFocus(restored_focus);
}

TEST_P(WaylandDataDragControllerTest, StartDragWithFileContents) {
  bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  // The client starts dragging offering text mime type.
  OSExchangeData os_exchange_data;
  os_exchange_data.SetFileContents(
      base::FilePath(FILE_PATH_LITERAL("t\\est\".jpg")),
      kSampleTextForDragAndDrop);
  int operations = DragDropTypes::DRAG_COPY | DragDropTypes::DRAG_MOVE;
  drag_controller()->StartSession(os_exchange_data, operations,
                                  DragEventSource::kMouse);
  Sync();

  base::RunLoop run_loop;
  auto callback = base::BindOnce(
      [](base::RunLoop* loop, std::vector<uint8_t>&& data) {
        std::string result(data.begin(), data.end());
        EXPECT_EQ(kSampleTextForDragAndDrop, result);
        loop->Quit();
      },
      &run_loop);
  data_device_manager_->data_source()->ReadData(
      "application/octet-stream;name=\"t\\\\est\\\".jpg\"",
      std::move(callback));
  run_loop.Run();
  EXPECT_EQ(1u, data_device_manager_->data_source()->mime_types().size());
  EXPECT_EQ("application/octet-stream;name=\"t\\\\est\\\".jpg\"",
            data_device_manager_->data_source()->mime_types().front());
  window_->SetPointerFocus(restored_focus);
}

TEST_P(WaylandDataDragControllerTest, ReceiveDrag) {
  auto* data_offer =
      data_device_manager_->data_device()->CreateAndSendDataOffer();
  data_offer->OnOffer(kMimeTypeText,
                      ToClipboardData(std::string(kSampleTextForDragAndDrop)));

  gfx::Point entered_point(10, 10);
  // The server sends an enter event.
  data_device_manager_->data_device()->OnEnter(
      1002, surface_->resource(), wl_fixed_from_int(entered_point.x()),
      wl_fixed_from_int(entered_point.y()), data_offer);

  Sync();

  int64_t time =
      (EventTimeForNow() - base::TimeTicks()).InMilliseconds() & UINT32_MAX;
  gfx::Point motion_point(11, 11);

  // The server sends an motion event.
  data_device_manager_->data_device()->OnMotion(
      time, wl_fixed_from_int(motion_point.x()),
      wl_fixed_from_int(motion_point.y()));

  Sync();

  auto callback = base::BindOnce([](PlatformClipboard::Data contents) {
    std::string result;
    EXPECT_TRUE(contents);
    result.assign(contents->front_as<char>(), contents->size());
    EXPECT_EQ(kSampleTextForDragAndDrop, result);
  });

  // The client requests the data and gets callback with it.
  data_device()->RequestData(drag_controller()->data_offer_.get(),
                             kMimeTypeText, std::move(callback));
  Sync();

  data_device_manager_->data_device()->OnLeave();
}

TEST_P(WaylandDataDragControllerTest, DropSeveralMimeTypes) {
  auto* data_offer =
      data_device_manager_->data_device()->CreateAndSendDataOffer();
  data_offer->OnOffer(kMimeTypeText,
                      ToClipboardData(std::string(kSampleTextForDragAndDrop)));
  data_offer->OnOffer(
      kMimeTypeMozillaURL,
      ToClipboardData(std::u16string(u"https://sample.com/\r\nSample")));
  data_offer->OnOffer(
      kMimeTypeURIList,
      ToClipboardData(std::string("file:///home/user/file\r\n")));

  EXPECT_CALL(*drop_handler_, MockOnDragEnter()).Times(1);
  gfx::Point entered_point(10, 10);
  data_device_manager_->data_device()->OnEnter(
      1002, surface_->resource(), wl_fixed_from_int(entered_point.x()),
      wl_fixed_from_int(entered_point.y()), data_offer);
  // Here we are expecting three data items, so there will be three roundtrips
  // to the Wayland and back.  Hence Sync() three times.
  Sync();
  Sync();
  Sync();

  EXPECT_CALL(*drop_handler_, MockOnDragDrop()).Times(1);
  base::RunLoop loop;
  drop_handler_->SetOnDropClosure(loop.QuitClosure());
  data_device_manager_->data_device()->OnDrop();

  Sync();
  loop.Run();
  Mock::VerifyAndClearExpectations(drop_handler_.get());

  ASSERT_NE(drop_handler_->dropped_data(), nullptr);
  EXPECT_TRUE(drop_handler_->dropped_data()->HasString());
  EXPECT_TRUE(drop_handler_->dropped_data()->HasFile());
  EXPECT_TRUE(drop_handler_->dropped_data()->HasURL(kFilenameToURLPolicy));

  data_device_manager_->data_device()->OnLeave();
}

// Tests URI validation for text/uri-list MIME type.  Log warnings rendered in
// the console when this test is running are the expected and valid side effect.
TEST_P(WaylandDataDragControllerTest, ValidateDroppedUriList) {
  const struct {
    std::string content;
    base::flat_set<std::string> expected_uris;
  } kCases[] = {{{}, {}},
                {"file:///home/user/file\r\n", {"/home/user/file"}},
                {"# Comment\r\n"
                 "file:///home/user/file\r\n"
                 "file:///home/guest/file\r\n"
                 "not a filename at all\r\n"
                 "https://valid.url/but/scheme/is/not/file/so/invalid\r\n",
                 {"/home/user/file", "/home/guest/file"}}};

  for (const auto& kCase : kCases) {
    auto* data_offer =
        data_device_manager_->data_device()->CreateAndSendDataOffer();
    data_offer->OnOffer(kMimeTypeURIList, ToClipboardData(kCase.content));

    EXPECT_CALL(*drop_handler_, MockOnDragEnter()).Times(1);
    gfx::Point entered_point(10, 10);
    data_device_manager_->data_device()->OnEnter(
        1002, surface_->resource(), wl_fixed_from_int(entered_point.x()),
        wl_fixed_from_int(entered_point.y()), data_offer);
    Sync();

    EXPECT_CALL(*drop_handler_, MockOnDragDrop()).Times(1);
    base::RunLoop loop;
    drop_handler_->SetOnDropClosure(loop.QuitClosure());
    data_device_manager_->data_device()->OnDrop();

    Sync();
    loop.Run();
    Mock::VerifyAndClearExpectations(drop_handler_.get());

    if (kCase.expected_uris.empty()) {
      EXPECT_FALSE(drop_handler_->dropped_data()->HasFile());
    } else {
      EXPECT_TRUE(drop_handler_->dropped_data()->HasFile());
      std::vector<FileInfo> filenames;
      EXPECT_TRUE(drop_handler_->dropped_data()->GetFilenames(&filenames));
      EXPECT_EQ(filenames.size(), kCase.expected_uris.size());
      for (const auto& filename : filenames)
        EXPECT_EQ(kCase.expected_uris.count(filename.path.AsUTF8Unsafe()), 1U);
    }

    EXPECT_CALL(*drop_handler_, OnDragLeave()).Times(1);
    data_device_manager_->data_device()->OnLeave();
    Sync();
    Mock::VerifyAndClearExpectations(drop_handler_.get());
  }
}

// Tests URI validation for text/x-moz-url MIME type.  Log warnings rendered in
// the console when this test is running are the expected and valid side effect.
TEST_P(WaylandDataDragControllerTest, ValidateDroppedXMozUrl) {
  const struct {
    std::u16string content;
    std::string expected_url;
    std::u16string expected_title;
  } kCases[] = {
      {{}, {}, {}},
      {u"http://sample.com/\r\nSample", "http://sample.com/", u"Sample"},
      {u"http://title.must.be.set/", {}, {}},
      {u"url.must.be.valid/and/have.scheme\r\nInvalid URL", {}, {}},
      {u"file:///files/are/ok\r\nThe policy allows that",
       "file:///files/are/ok", u"The policy allows that"}};

  for (const auto& kCase : kCases) {
    auto* data_offer =
        data_device_manager_->data_device()->CreateAndSendDataOffer();
    data_offer->OnOffer(kMimeTypeMozillaURL, ToClipboardData(kCase.content));

    EXPECT_CALL(*drop_handler_, MockOnDragEnter()).Times(1);
    gfx::Point entered_point(10, 10);
    data_device_manager_->data_device()->OnEnter(
        1002, surface_->resource(), wl_fixed_from_int(entered_point.x()),
        wl_fixed_from_int(entered_point.y()), data_offer);
    Sync();

    EXPECT_CALL(*drop_handler_, MockOnDragDrop()).Times(1);
    base::RunLoop loop;
    drop_handler_->SetOnDropClosure(loop.QuitClosure());
    data_device_manager_->data_device()->OnDrop();

    Sync();
    loop.Run();
    Mock::VerifyAndClearExpectations(drop_handler_.get());

    const auto* const dropped_data = drop_handler_->dropped_data();
    if (kCase.expected_url.empty()) {
      EXPECT_FALSE(dropped_data->HasURL(kFilenameToURLPolicy));
    } else {
      EXPECT_TRUE(dropped_data->HasURL(kFilenameToURLPolicy));
      GURL url;
      std::u16string title;
      EXPECT_TRUE(
          dropped_data->GetURLAndTitle(kFilenameToURLPolicy, &url, &title));
      EXPECT_EQ(url.spec(), kCase.expected_url);
      EXPECT_EQ(title, kCase.expected_title);
    }

    EXPECT_CALL(*drop_handler_, OnDragLeave()).Times(1);
    data_device_manager_->data_device()->OnLeave();
    Sync();
    Mock::VerifyAndClearExpectations(drop_handler_.get());
  }
}

// Verifies the correct delegate functions are called when a drag session is
// started and cancelled within the same surface.
TEST_P(WaylandDataDragControllerTest, StartAndCancel) {
  const bool restored_focus = window_->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  // Schedule a wl_data_source::cancelled event to be sent asynchronously
  // once the drag session gets started.
  ScheduleDragCancel();

  RunMouseDragWithSampleData(window_.get(), DragDropTypes::DRAG_COPY);

  window_->SetPointerFocus(restored_focus);
}

TEST_P(WaylandDataDragControllerTest, ForeignDragHandleAskAction) {
  auto* data_offer =
      data_device_manager_->data_device()->CreateAndSendDataOffer();
  data_offer->OnOffer(kMimeTypeText,
                      ToClipboardData(std::string(kSampleTextForDragAndDrop)));
  data_offer->OnSourceActions(WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE |
                              WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY);
  data_offer->OnAction(WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK);

  gfx::Point entered_point(10, 10);
  // The server sends an enter event.
  data_device_manager_->data_device()->OnEnter(
      1002, surface_->resource(), wl_fixed_from_int(entered_point.x()),
      wl_fixed_from_int(entered_point.y()), data_offer);
  Sync();

  int64_t time = 1;
  gfx::Point motion_point(11, 11);

  // Verify ask handling with drop handler preferring "copy" operation.
  drop_handler_->SetPreferredOperations(ui::DragDropTypes::DRAG_COPY);
  data_device_manager_->data_device()->OnMotion(
      time, wl_fixed_from_int(motion_point.x()),
      wl_fixed_from_int(motion_point.y()));
  Sync();

  EXPECT_EQ(WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY,
            data_offer->preferred_action());
  EXPECT_EQ(WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY,
            data_offer->supported_actions());

  data_device_manager_->data_device()->OnLeave();
}

// Verifies entered surface destruction is properly handled.
// Regression test for https://crbug.com/1143707.
TEST_P(WaylandDataDragControllerTest, DestroyEnteredSurface) {
  auto* window_1 = window_.get();
  const bool restored_focus = window_1->has_pointer_focus();
  FocusAndPressLeftPointerButton(window_1, &delegate_);

  ASSERT_EQ(PlatformWindowType::kWindow, window_1->type());

  auto test = [](WaylandDataDragControllerTest* self) {
    // Init and open |target_window|.
    MockPlatformWindowDelegate delegate_2;
    auto window_2 =
        self->CreateTestWindow(PlatformWindowType::kWindow, gfx::Size(80, 80),
                               &delegate_2, gfx::kNullAcceleratedWidget);

    // Leave |window_1| and enter |window_2|.
    self->SendDndLeave();
    self->SendDndEnter(window_2.get(), gfx::Point(20, 20));
    self->Sync();

    // Destroy the entered window at client side and emulates a
    // wl_data_device::leave to ensure no UAF happens.
    window_2->PrepareForShutdown();
    window_2.reset();
    self->SendDndLeave();
    self->Sync();

    // Emulate server sending an wl_data_source::cancelled event so the drag
    // loop is finished.
    self->SendDndCancelled();
    self->Sync();
  };

  // Post test task to be performed asynchronously once the drag session gets
  // started.
  ScheduleTestTask(base::BindOnce(test, base::Unretained(this)));

  RunMouseDragWithSampleData(window_.get(), DragDropTypes::DRAG_COPY);

  window_1->SetPointerFocus(restored_focus);
}

// Verifies that early origin surface destruction is properly handled.
// Regression test for https://crbug.com/1143707.
TEST_P(WaylandDataDragControllerTest, DestroyOriginSurface) {
  auto* window_1 = window_.get();
  const bool restored_focus = window_1->has_pointer_focus();
  window_1->SetPointerFocus(false);
  ASSERT_EQ(PlatformWindowType::kWindow, window_1->type());

  auto test = [](WaylandDataDragControllerTest* self,
                 std::unique_ptr<WaylandWindow>* origin) {
    // Leave origin surface and enter |window_|.
    self->SendDndLeave();
    self->SendDndEnter(self->window(), gfx::Point(20, 20));
    self->Sync();

    // Shutdown and destroy the popup window where the drag session was
    // initiated, which leads to the drag loop to finish.
    (*origin)->PrepareForShutdown();
    origin->reset();
  };

  // Init and open |target_window|.
  MockPlatformWindowDelegate delegate_2;
  auto window_2 =
      CreateTestWindow(PlatformWindowType::kPopup, gfx::Size(80, 80),
                       &delegate_2, window_1->GetWidget());
  FocusAndPressLeftPointerButton(window_2.get(), &delegate_);

  // Post test task to be performed asynchronously once the drag session gets
  // started.
  ScheduleTestTask(base::BindOnce(test, base::Unretained(this),
                                  base::Unretained(&window_2)));

  // Request to start the drag session, which spins a nested run loop.
  OSExchangeData os_exchange_data;
  os_exchange_data.SetString(sample_text_for_dnd());
  window_2->StartDrag(os_exchange_data, DragDropTypes::DRAG_COPY,
                      DragEventSource::kMouse, {}, true,
                      drag_handler_delegate_.get());
  Sync();

  // Send wl_data_source::cancelled event. The drag controller is then
  // expected to gracefully reset its internal state.
  SendDndLeave();
  SendDndCancelled();
  Sync();

  window_1->SetPointerFocus(restored_focus);
}

// Ensures drag/drop events are properly propagated to non-toplevel windows.
TEST_P(WaylandDataDragControllerTest, DragToNonToplevelWindows) {
  auto* origin_window = window_.get();
  const bool restored_focus = origin_window->has_pointer_focus();
  FocusAndPressLeftPointerButton(origin_window, &delegate_);

  auto test = [](WaylandDataDragControllerTest* self,
                 PlatformWindowType window_type,
                 gfx::AcceleratedWidget context) {
    // Init and open |target_window|.
    MockPlatformWindowDelegate aux_window_delegate;
    auto aux_window = self->CreateTestWindow(window_type, gfx::Size(100, 40),
                                             &aux_window_delegate, context);

    // Leave |origin_window| and enter non-toplevel |aux_window|.
    self->SendDndLeave();
    EXPECT_CALL(*self->drop_handler(), OnDragLeave).Times(1);
    self->Sync();

    self->SendDndEnter(aux_window.get(), {});
    EXPECT_CALL(*self->drop_handler(), MockOnDragEnter()).Times(1);
    EXPECT_CALL(*self->drop_handler(), MockDragMotion(_, _, _)).Times(1);
    self->Sync();

    // Goes back to |origin_window|, as |aux_window| is going to get destroyed
    // once this test task finishes.
    self->SendDndLeave();
    EXPECT_CALL(*self->drop_handler(), OnDragLeave).Times(1);
    self->Sync();

    self->SendDndEnter(self->window(), {});
    EXPECT_CALL(*self->drop_handler(), MockOnDragEnter()).Times(1);
    EXPECT_CALL(*self->drop_handler(), MockDragMotion(_, _, _)).Times(1);
    self->Sync();
  };

  // Post test tasks, for each non-toplevel window type, to be performed
  // asynchronously once the dnd-related protocol objects are ready.
  constexpr PlatformWindowType kNonToplevelWindowTypes[]{
      PlatformWindowType::kPopup, PlatformWindowType::kMenu,
      PlatformWindowType::kTooltip, PlatformWindowType::kBubble};
  for (auto window_type : kNonToplevelWindowTypes) {
    ScheduleTestTask(base::BindOnce(test, base::Unretained(this), window_type,
                                    window_type == PlatformWindowType::kBubble
                                        ? gfx::kNullAcceleratedWidget
                                        : origin_window->GetWidget()));
  }

  // Post a wl_data_source::cancelled notifying the client to tear down the drag
  // session.
  ScheduleDragCancel();

  // Request to start the drag session, which spins a nested run loop.
  RunMouseDragWithSampleData(origin_window, DragDropTypes::DRAG_COPY);

  origin_window->SetPointerFocus(restored_focus);
}

// Ensures that requests to create a |PlatformWindowType::kPopup| during drag
// sessions return xdg_popup-backed windows.
TEST_P(WaylandDataDragControllerTest, PopupRequestCreatesPopupWindow) {
  auto* origin_window = window_.get();
  const bool restored_focus = origin_window->has_pointer_focus();
  FocusAndPressLeftPointerButton(origin_window, &delegate_);

  std::unique_ptr<WaylandWindow> popup_window;

  ScheduleTestTask(base::BindLambdaForTesting([&]() {
    MockPlatformWindowDelegate delegate;
    popup_window =
        CreateTestWindow(PlatformWindowType::kPopup, gfx::Size(100, 40),
                         &delegate, origin_window->GetWidget());
    popup_window->Show(false);
    Sync();
  }));

  // Post a wl_data_source::cancelled notifying the client to tear down the drag
  // session.
  ScheduleDragCancel();

  // Request to start the drag session, which spins a nested run loop.
  RunMouseDragWithSampleData(origin_window, DragDropTypes::DRAG_MOVE);

  Sync();
  ASSERT_TRUE(popup_window.get());
  auto* surface = GetMockSurface(popup_window->root_surface()->GetSurfaceId());
  ASSERT_TRUE(surface);
  EXPECT_NE(nullptr, surface->xdg_surface()->xdg_popup());

  origin_window->SetPointerFocus(restored_focus);
}

// Ensures that requests to create a |PlatformWindowType::kMenu| during drag
// sessions return xdg_popup-backed windows.
TEST_P(WaylandDataDragControllerTest, MenuRequestCreatesPopupWindow) {
  auto* origin_window = window_.get();
  const bool restored_focus = origin_window->has_pointer_focus();
  FocusAndPressLeftPointerButton(origin_window, &delegate_);

  auto test = [](WaylandDataDragControllerTest* self,
                 gfx::AcceleratedWidget context) {
    MockPlatformWindowDelegate delegate;
    auto menu_window = self->CreateTestWindow(
        PlatformWindowType::kMenu, gfx::Size(100, 40), &delegate, context);
    menu_window->Show(false);
    self->Sync();

    auto* surface =
        self->GetMockSurface(menu_window->root_surface()->GetSurfaceId());
    ASSERT_TRUE(surface);
    EXPECT_EQ(nullptr, surface->sub_surface());
  };

  ScheduleTestTask(
      base::BindOnce(test, base::Unretained(this), origin_window->GetWidget()));

  // Post a wl_data_source::cancelled notifying the client to tear down the drag
  // session.
  ScheduleDragCancel();

  // Request to start the drag session, which spins a nested run loop.
  RunMouseDragWithSampleData(origin_window, DragDropTypes::DRAG_COPY);

  origin_window->SetPointerFocus(restored_focus);
}

// Regression test for https://crbug.com/1209269.
TEST_P(WaylandDataDragControllerTest, AsyncNoopStartDrag) {
  const bool restored_focus = window_->has_pointer_focus();
  OSExchangeData os_exchange_data;
  os_exchange_data.SetString(sample_text_for_dnd());

  FocusAndPressLeftPointerButton(window_.get(), &delegate_);

  // Emulate a "quick" wl_pointer.button release event being processed by the
  // compositor, which leads to a no-op subsequent wl_data_device.start_drag.
  // In this case, the client is expected to gracefully reset state and quit
  // drag loop as if the drag session was cancelled as usual.
  SendPointerButton(window_.get(), &delegate_, BTN_LEFT, /*pressed=*/false);
  Sync();

  EXPECT_CALL(*this, MockStartDrag(_, _, _)).Times(0);

  // Attempt to start drag session and ensure it fails.
  bool result = window_->StartDrag(os_exchange_data, DragDropTypes::DRAG_COPY,
                                   DragEventSource::kMouse, /*cursor=*/{},
                                   /*can_grab_pointer=*/true,
                                   drag_handler_delegate_.get());
  EXPECT_FALSE(result);
  Mock::VerifyAndClearExpectations(drop_handler_.get());
  Mock::VerifyAndClearExpectations(this);

  window_->SetPointerFocus(restored_focus);
}

// Regression test for https://crbug.com/1175083.
TEST_P(WaylandDataDragControllerTest, StartDragWithCorrectSerial) {
  const bool restored_focus = window_->has_pointer_focus();

  FocusAndPressLeftPointerButton(window_.get(), &delegate_);
  uint32_t mouse_press_serial = current_serial_;

  // Emulate a wl_keyboard.key press event being processed by the compositor
  // before the drag starts. In this case, the client is expected to send the
  // correct serial value when starting the drag session (ie: the one received
  // with wl_pointer.button).
  auto* keyboard = server_.seat()->keyboard();
  ASSERT_TRUE(keyboard);
  struct wl_array empty;
  wl_array_init(&empty);
  wl_keyboard_send_enter(keyboard->resource(), 1, surface_->resource(), &empty);
  wl_array_release(&empty);
  wl_keyboard_send_key(keyboard->resource(), NextSerial(), 0, 30 /* a */,
                       WL_KEYBOARD_KEY_STATE_PRESSED);
  Sync();

  // Post a wl_data_source::cancelled notifying the client to tear down the drag
  // session.
  ScheduleDragCancel();

  // Request to start the drag session, which spins a nested run loop, and
  // ensure correct serial (mouse button press) is sent to the server with
  // wl_data_device.start_drag request.
  EXPECT_CALL(*this, MockStartDrag(_, _, Eq(mouse_press_serial))).Times(1);
  RunMouseDragWithSampleData(window_.get(), DragDropTypes::DRAG_COPY);
  Mock::VerifyAndClearExpectations(drop_handler_.get());
  Mock::VerifyAndClearExpectations(this);

  window_->SetPointerFocus(restored_focus);
}

// Check drag session is correctly started when there are both mouse button and
// a touch point pressed.
TEST_P(WaylandDataDragControllerTest, StartDragWithCorrectSerialForDragSource) {
  const bool pointer_focus = window_->has_pointer_focus();
  const bool touch_focus = window_->has_touch_focus();
  OSExchangeData os_exchange_data;
  os_exchange_data.SetString(sample_text_for_dnd());

  auto* const window_manager = connection_->wayland_window_manager();
  ASSERT_FALSE(window_manager->GetCurrentPointerFocusedWindow());
  ASSERT_FALSE(window_manager->GetCurrentTouchFocusedWindow());

  FocusAndPressLeftPointerButton(window_.get(), &delegate_);
  uint32_t mouse_press_serial = current_serial_;
  ASSERT_EQ(window_.get(), window_manager->GetCurrentPointerFocusedWindow());
  ASSERT_FALSE(window_manager->GetCurrentTouchFocusedWindow());

  // Check drag does not start when requested with kTouch drag source, even when
  // there is a mouse button pressed (ie: kMousePress serial available).
  EXPECT_CALL(*this, MockStartDrag(_, _, _)).Times(0);
  bool drag_started = window_->StartDrag(
      os_exchange_data, DragDropTypes::DRAG_COPY, DragEventSource::kTouch,
      /*cursor=*/{}, /*can_grab_pointer=*/true, drag_handler_delegate_.get());
  EXPECT_FALSE(drag_started);
  Mock::VerifyAndClearExpectations(drop_handler_.get());
  Mock::VerifyAndClearExpectations(this);

  SendTouchDown(window_.get(), &delegate_, 1, {30, 30});
  Sync();
  ASSERT_EQ(window_.get(), window_manager->GetCurrentTouchFocusedWindow());
  ASSERT_EQ(window_.get(), window_manager->GetCurrentPointerFocusedWindow());

  // Schedule dnd session cancellation so that the drag loop gracefully exits.
  ScheduleDragCancel();

  // Check drag is started with correct serial value, as per the drag source
  // passed in, even when it is not the most recent serial, ie: touch down
  // received after mouse button press.
  EXPECT_CALL(*this, MockStartDrag(_, _, Eq(mouse_press_serial))).Times(1);
  bool success = window_->StartDrag(
      os_exchange_data, DragDropTypes::DRAG_COPY, DragEventSource::kMouse,
      /*cursor=*/{}, /*can_grab_pointer=*/true, drag_handler_delegate_.get());
  EXPECT_TRUE(success);
  Mock::VerifyAndClearExpectations(drop_handler_.get());
  Mock::VerifyAndClearExpectations(this);

  // Restore window's focus state.
  window_->SetPointerFocus(pointer_focus);
  window_->set_touch_focus(touch_focus);
}

INSTANTIATE_TEST_SUITE_P(XdgVersionStableTest,
                         WaylandDataDragControllerTest,
                         Values(wl::ServerConfig{
                             .shell_version = wl::ShellVersion::kStable}));

INSTANTIATE_TEST_SUITE_P(XdgVersionV6Test,
                         WaylandDataDragControllerTest,
                         Values(wl::ServerConfig{
                             .shell_version = wl::ShellVersion::kV6}));

}  // namespace ui