// Copyright 2013 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 "ash/test/ash_test_helper.h"

#include <algorithm>
#include <memory>
#include <set>
#include <utility>

#include "ash/app_list/test/app_list_test_helper.h"
#include "ash/display/display_configuration_controller_test_api.h"
#include "ash/display/screen_ash.h"
#include "ash/keyboard/ash_keyboard_controller.h"
#include "ash/keyboard/test_keyboard_ui.h"
#include "ash/mojo_test_interface_factory.h"
#include "ash/public/cpp/ash_switches.h"
#include "ash/public/cpp/test/test_keyboard_controller_observer.h"
#include "ash/session/test_session_controller_client.h"
#include "ash/shell.h"
#include "ash/shell_init_params.h"
#include "ash/system/screen_layout_observer.h"
#include "ash/test/ash_test_views_delegate.h"
#include "ash/test_shell_delegate.h"
#include "ash/ws/window_service_owner.h"
#include "base/bind.h"
#include "base/guid.h"
#include "base/run_loop.h"
#include "base/strings/string_split.h"
#include "base/token.h"
#include "chromeos/audio/cras_audio_handler.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/hammerd/hammerd_client.h"
#include "chromeos/dbus/power_policy_controller.h"
#include "chromeos/network/network_handler.h"
#include "chromeos/system/fake_statistics_provider.h"
#include "components/discardable_memory/public/interfaces/discardable_shared_memory_manager.mojom.h"
#include "components/prefs/testing_pref_service.h"
#include "device/bluetooth/bluetooth_adapter_factory.h"
#include "device/bluetooth/dbus/bluez_dbus_manager.h"
#include "mojo/public/cpp/bindings/binding_set.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "services/service_manager/public/cpp/bind_source_info.h"
#include "services/service_manager/public/cpp/connector.h"
#include "services/service_manager/public/cpp/identity.h"
#include "services/service_manager/public/cpp/service.h"
#include "services/ws/public/cpp/host/gpu_interface_provider.h"
#include "services/ws/public/mojom/constants.mojom.h"
#include "services/ws/public/mojom/gpu.mojom.h"
#include "services/ws/window_service.h"
#include "ui/aura/env.h"
#include "ui/aura/input_state_lookup.h"
#include "ui/aura/test/env_test_helper.h"
#include "ui/aura/test/event_generator_delegate_aura.h"
#include "ui/aura/test/test_windows.h"
#include "ui/aura/window.h"
#include "ui/base/ime/input_method_initializer.h"
#include "ui/base/material_design/material_design_controller.h"
#include "ui/base/platform_window_defaults.h"
#include "ui/base/ui_base_features.h"
#include "ui/base/ui_base_switches_util.h"
#include "ui/compositor/scoped_animation_duration_scale_mode.h"
#include "ui/compositor/test/context_factories_for_test.h"
#include "ui/display/display.h"
#include "ui/display/display_switches.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/screen.h"
#include "ui/display/test/display_manager_test_api.h"
#include "ui/views/mus/mus_client.h"
#include "ui/wm/core/capture_controller.h"
#include "ui/wm/core/cursor_manager.h"
#include "ui/wm/core/wm_state.h"

namespace ash {

// An implementation of GpuInterfaceProvider that queues up requests for
// interfaces. The requests are never actually bound, but are kept alive to
// ensure the requestor doesn't detect a close and try to exit.
class TestGpuInterfaceProvider : public ws::GpuInterfaceProvider {
 public:
  TestGpuInterfaceProvider() = default;
  ~TestGpuInterfaceProvider() override = default;

  // ws::GpuInterfaceProvider:
  void RegisterGpuInterfaces(
      service_manager::BinderRegistry* registry) override {
    registry->AddInterface(base::BindRepeating(
        &TestGpuInterfaceProvider::BindDiscardableSharedMemoryManager,
        base::Unretained(this)));
    registry->AddInterface(base::BindRepeating(
        &TestGpuInterfaceProvider::BindGpuRequest, base::Unretained(this)));
  }
  void BindOzoneGpuInterface(const std::string& interface_name,
                             mojo::ScopedMessagePipeHandle handle) override {}

 private:
  void BindDiscardableSharedMemoryManager(
      discardable_memory::mojom::DiscardableSharedMemoryManagerRequest
          request) {
    request_handles_.push_back(request.PassMessagePipe());
  }
  void BindGpuRequest(ws::mojom::GpuRequest request) {
    request_handles_.push_back(request.PassMessagePipe());
  }

  std::vector<mojo::ScopedMessagePipeHandle> request_handles_;

  DISALLOW_COPY_AND_ASSIGN(TestGpuInterfaceProvider);
};

AshTestHelper::AshTestHelper()
    : command_line_(std::make_unique<base::test::ScopedCommandLine>()) {
  ui::test::EnableTestConfigForPlatformWindows();
}

AshTestHelper::~AshTestHelper() {
  // Ensure the next test starts with a null display::Screen. Done here because
  // some tests use Screen after TearDown().
  ScreenAsh::DeleteScreenForShutdown();
}

void AshTestHelper::SetUp(bool start_session, bool provide_local_state) {
#if !defined(NDEBUG)
  aura::Window::SetEnvArgRequired(
      "Within ash you must supply a non-null aura::Env when creating a Window, "
      "use window_factory, or supply the Env obtained from "
      "Shell::Get()->aura_env()");
#endif

  // TODO(jamescook): Can we do this without changing command line?
  // Use the origin (1,1) so that it doesn't over
  // lap with the native mouse cursor.
  if (!command_line_->GetProcessCommandLine()->HasSwitch(
          ::switches::kHostWindowBounds)) {
    command_line_->GetProcessCommandLine()->AppendSwitchASCII(
        ::switches::kHostWindowBounds, "1+1-800x600");
  }

  statistics_provider_ =
      std::make_unique<chromeos::system::ScopedFakeStatisticsProvider>();

  ui::test::EventGeneratorDelegate::SetFactoryFunction(base::BindRepeating(
      &aura::test::EventGeneratorDelegateAura::Create, nullptr));

  display::ResetDisplayIdForTest();
  wm_state_ = std::make_unique<::wm::WMState>();
  // Only create a ViewsDelegate if the test didn't create one already.
  if (!views::ViewsDelegate::GetInstance())
    test_views_delegate_ = std::make_unique<AshTestViewsDelegate>();

  // Disable animations during tests.
  zero_duration_mode_.reset(new ui::ScopedAnimationDurationScaleMode(
      ui::ScopedAnimationDurationScaleMode::ZERO_DURATION));
  ui::InitializeInputMethodForTesting();

  // Creates Shell and hook with Desktop.
  if (!test_shell_delegate_)
    test_shell_delegate_ = new TestShellDelegate;

  if (!chromeos::DBusThreadManager::IsInitialized()) {
    chromeos::DBusThreadManager::Initialize(
        chromeos::DBusThreadManager::kShared);
    chromeos::HammerdClient::Initialize(
        chromeos::DBusThreadManager::Get()->GetSystemBus());
    dbus_thread_manager_initialized_ = true;
  }

  if (!bluez::BluezDBusManager::IsInitialized()) {
    bluez::BluezDBusManager::Initialize();
    bluez_dbus_manager_initialized_ = true;
  }

  chromeos::PowerManagerClient::Initialize();

  if (!chromeos::PowerPolicyController::IsInitialized()) {
    chromeos::PowerPolicyController::Initialize(
        chromeos::PowerManagerClient::Get());
    power_policy_controller_initialized_ = true;
  }

  // Create CrasAudioHandler for testing since g_browser_process is not
  // created in AshTestBase tests.
  chromeos::CrasAudioHandler::InitializeForTesting();

  // Reset the global state for the cursor manager. This includes the
  // last cursor visibility state, etc.
  ::wm::CursorManager::ResetCursorVisibilityStateForTest();

  ui::MaterialDesignController::Initialize();

  CreateShell();

  // Reset aura::Env to eliminate test dependency (https://crbug.com/586514).
  aura::test::EnvTestHelper env_helper(Shell::Get()->aura_env());
  env_helper.ResetEnvForTesting();

  aura::test::SetEnvForTestWindows(Shell::Get()->aura_env());

  env_helper.SetInputStateLookup(std::unique_ptr<aura::InputStateLookup>());

  Shell* shell = Shell::Get();

  // Cursor is visible by default in tests.
  // CursorManager is null on MASH.
  if (shell->cursor_manager())
    shell->cursor_manager()->ShowCursor();

  if (provide_local_state) {
    auto pref_service = std::make_unique<TestingPrefServiceSimple>();
    Shell::RegisterLocalStatePrefs(pref_service->registry(), true);
    Shell::Get()->OnLocalStatePrefServiceInitialized(std::move(pref_service));
  }

  session_controller_client_.reset(
      new TestSessionControllerClient(shell->session_controller()));
  session_controller_client_->InitializeAndBind();

  if (start_session)
    session_controller_client_->CreatePredefinedUserSessions(1);

  // Tests that change the display configuration generally don't care about
  // the notifications and the popup UI can interfere with things like
  // cursors.
  shell->screen_layout_observer()->set_show_notifications_for_testing(false);

  display::test::DisplayManagerTestApi(shell->display_manager())
      .DisableChangeDisplayUponHostResize();
  DisplayConfigurationControllerTestApi(
      shell->display_configuration_controller())
      .SetDisplayAnimator(false);

  app_list_test_helper_ = std::make_unique<AppListTestHelper>();

  CreateWindowService();

  // Create the test keyboard controller observer to respond to
  // OnLoadKeyboardContentsRequested() and enable the virtual keyboard. Note:
  // enabling the keyboard just makes it available, it does not show it or
  // otherwise affect behavior.
  test_keyboard_controller_observer_ =
      std::make_unique<TestKeyboardControllerObserver>(
          shell->ash_keyboard_controller());
  shell->ash_keyboard_controller()->EnableKeyboard();
}

void AshTestHelper::TearDown() {
  mus_client_.reset();
  window_tree_client_setter_.reset();

  test_keyboard_controller_observer_.reset();
  app_list_test_helper_.reset();

  aura::test::SetEnvForTestWindows(nullptr);

  Shell::DeleteInstance();

  // Suspend the tear down until all resources are returned via
  // CompositorFrameSinkClient::ReclaimResources()
  base::RunLoop().RunUntilIdle();

  chromeos::CrasAudioHandler::Shutdown();

  if (power_policy_controller_initialized_) {
    chromeos::PowerPolicyController::Shutdown();
    power_policy_controller_initialized_ = false;
  }

  chromeos::PowerManagerClient::Shutdown();

  if (bluez_dbus_manager_initialized_) {
    device::BluetoothAdapterFactory::Shutdown();
    bluez::BluezDBusManager::Shutdown();
    bluez_dbus_manager_initialized_ = false;
  }

  if (dbus_thread_manager_initialized_) {
    chromeos::HammerdClient::Shutdown();
    chromeos::DBusThreadManager::Shutdown();
    dbus_thread_manager_initialized_ = false;
  }

  ui::TerminateContextFactoryForTests();

  // ui::TerminateContextFactoryForTests() destroyed the context factory (and
  // context factory private) referenced by Env. Reset Env's members in case
  // some other test tries to use it. This matters if someone else created Env
  // (such as the test suite) and is long lived.
  if (aura::Env::HasInstance()) {
    aura::Env::GetInstance()->set_context_factory(nullptr);
    aura::Env::GetInstance()->set_context_factory_private(nullptr);
  }

  ui::ShutdownInputMethodForTesting();
  zero_duration_mode_.reset();

  test_views_delegate_.reset();
  wm_state_.reset();

  command_line_.reset();

  display::Display::ResetForceDeviceScaleFactorForTesting();

  CHECK(!::wm::CaptureController::Get());
#if !defined(NDEBUG)
  aura::Window::SetEnvArgRequired(nullptr);
#endif

  ui::test::EventGeneratorDelegate::SetFactoryFunction(
      ui::test::EventGeneratorDelegate::FactoryFunction());

  statistics_provider_.reset();
}

void AshTestHelper::SetRunningOutsideAsh() {
  test_views_delegate_->set_running_outside_ash();
#if DCHECK_IS_ON()
  aura::Window::SetEnvArgRequired(nullptr);
#endif
}

PrefService* AshTestHelper::GetLocalStatePrefService() {
  return Shell::Get()->local_state_.get();
}

aura::Window* AshTestHelper::CurrentContext() {
  aura::Window* root_window = Shell::GetRootWindowForNewWindows();
  if (!root_window)
    root_window = Shell::GetPrimaryRootWindow();
  DCHECK(root_window);
  return root_window;
}

display::Display AshTestHelper::GetSecondaryDisplay() {
  return Shell::Get()->display_manager()->GetSecondaryDisplay();
}

service_manager::Connector* AshTestHelper::GetWindowServiceConnector() {
  return window_service_connector_.get();
}

void AshTestHelper::CreateMusClient() {
  DCHECK(!mus_client_);
  // Set aura::Env's WindowTreeClient to null. This is necessary as code such
  // as AshTestBase may have already installed a WindowTreeClient.
  window_tree_client_setter_ =
      std::make_unique<aura::test::EnvWindowTreeClientSetter>(nullptr);
  // As EnvWindowTreeClientSetter sets aura::Env's WindowTreeClient to null, it
  // also sets Env::in_mus_shutdown_ to false. Env isn't in shutdown at this
  // point, so force it to false.
  aura::test::EnvTestHelper().SetInMusShutdown(false);

  // Configure views backed by mus.
  views::MusClient::InitParams mus_client_init_params;
  mus_client_init_params.connector = GetWindowServiceConnector();
  mus_client_init_params.create_wm_state = false;
  mus_client_init_params.running_in_ws_process = true;
  mus_client_ = std::make_unique<views::MusClient>(mus_client_init_params);
}

void AshTestHelper::CreateWindowService() {
  Shell::Get()->window_service_owner()->BindWindowService(
      test_connector_factory_.RegisterInstance(ws::mojom::kServiceName));

  // WindowService::OnStart() is not immediately called (it happens async over
  // mojo). If this becomes a problem we could run the MessageLoop here.
  // Surprisingly running the MessageLooop results in some test failures. These
  // failures seem to be because spinning the messageloop causes some timers to
  // fire (perhaps animations too) the results in a slightly different Shell
  // state.
  window_service_connector_ = test_connector_factory_.CreateConnector();
}

void AshTestHelper::CreateShell() {
  ui::ContextFactory* context_factory = nullptr;
  ui::ContextFactoryPrivate* context_factory_private = nullptr;
  bool enable_pixel_output = false;
  ui::InitializeContextFactoryForTests(enable_pixel_output, &context_factory,
                                       &context_factory_private);
  ShellInitParams init_params;
  init_params.delegate.reset(test_shell_delegate_);
  init_params.context_factory = context_factory;
  init_params.context_factory_private = context_factory_private;
  init_params.gpu_interface_provider =
      std::make_unique<TestGpuInterfaceProvider>();
  init_params.keyboard_ui_factory = std::make_unique<TestKeyboardUIFactory>();
  Shell::CreateInstance(std::move(init_params));
}

}  // namespace ash