// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
#define ASH_APP_LIST_APP_LIST_VIEW_DELEGATE_H_

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

#include "ash/app_list/app_list_metrics.h"
#include "ash/assistant/ui/assistant_view_delegate.h"
#include "ash/public/cpp/app_list/app_list_client.h"
#include "ash/public/cpp/app_list/app_list_types.h"
#include "ash/public/cpp/ash_public_export.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/ash/services/assistant/public/cpp/assistant_enums.h"
#include "ui/base/mojom/menu_source_type.mojom-forward.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"

namespace ui {
class SimpleMenuModel;
}  // namespace ui

namespace ash {

class AppListNotifier;
enum class AppListViewState;
struct AppLaunchedMetricParams;

// Wrapper for AppListControllerImpl, used by various app list views.
class ASH_PUBLIC_EXPORT AppListViewDelegate {
 public:
  virtual ~AppListViewDelegate() = default;

  // Returns the AppListNotifier instance. The notifier is owned by the
  // AppListClient, and may be nullptr if no client has been set for the
  // delegate.
  virtual AppListNotifier* GetNotifier() = 0;

  // Creates a `ScopedIphSession` for interacting with LauncherSearchHelpUi
  // feature. A caller must show an IPH UI after this returns a session. This
  // returns nullptr if `feature_engagement::Tracker::ShouldTriggerHelpUI`
  // returns false.
  virtual std::unique_ptr<ScopedIphSession>
  CreateLauncherSearchIphSession() = 0;

  // Invoked to start a new Google Assistant session.
  virtual void StartAssistant(assistant::AssistantEntryPoint entry_point) = 0;

  // Invoked to end a Google Assistant session.
  virtual void EndAssistant(assistant::AssistantExitPoint exit_point) = 0;

  // Returns the search categories that are available for users to choose if
  // they want to have the results in the categories displayed in launcher
  // search.
  virtual std::vector<AppListSearchControlCategory> GetToggleableCategories()
      const = 0;

  // Invoked to start a new search. This collects a list of search results
  // matching the raw query, which is an unhandled string typed into the search
  // box by the user.
  virtual void StartSearch(const std::u16string& raw_query) = 0;

  // Starts zero state search to load suggested content shown in productivity
  // launcher. Called when the tablet mode productivity launcher visibility
  // starts changing to visible. `callback` is called when the zero state search
  // completes, or times out (i.e. takes more time than `timeout`).
  virtual void StartZeroStateSearch(base::OnceClosure callback,
                                    base::TimeDelta timeout) = 0;

  // Invoked to open the search result and log a click. If the result is
  // represented by a SuggestedChipView or is a zero state result,
  // |suggested_index| is the index of the view in the list of suggestions.
  // |launch_type| is either kAppSearchResult or kSearchResult and is used to
  // determine which histograms to log to. |launch_as_default|: True if the
  // result is launched as the default result by user pressing ENTER key.
  virtual void OpenSearchResult(const std::string& result_id,
                                int event_flags,
                                AppListLaunchedFrom launched_from,
                                AppListLaunchType launch_type,
                                int suggestion_index,
                                bool launch_as_default) = 0;

  // Called to invoke a custom action on a result with |result_id|.
  virtual void InvokeSearchResultAction(const std::string& result_id,
                                        SearchResultActionType action) = 0;

  // Returns the context menu model for a ChromeSearchResult with |result_id|,
  // or nullptr if there is currently no menu for the result.
  // Note the returned menu model is owned by that result.
  using GetContextMenuModelCallback =
      base::OnceCallback<void(std::unique_ptr<ui::SimpleMenuModel>)>;

  // Invoked when the app list is shown.
  virtual void ViewShown(int64_t display_id) = 0;

  // Invoked to dismiss app list. This may leave the view open but hidden from
  // the user.
  virtual void DismissAppList() = 0;

  // Invoked when the app list is closing.
  virtual void ViewClosing() = 0;

  // Activates (opens) the item.
  virtual void ActivateItem(const std::string& id,
                            int event_flags,
                            AppListLaunchedFrom launched_from,
                            bool is_app_above_the_fold) = 0;

  // Returns the context menu model for a ChromeAppListItem with |id|, or
  // nullptr if there is currently no menu for the item (e.g. during install).
  // `item_context` indicates which piece of UI is showing the item (e.g. apps
  // grid or recent apps). Note the returned menu model is owned by that item.
  virtual void GetContextMenuModel(const std::string& id,
                                   AppListItemContext item_context,
                                   GetContextMenuModelCallback callback) = 0;

  // Show wallpaper context menu from the specified onscreen location.
  virtual void ShowWallpaperContextMenu(
      const gfx::Point& onscreen_location,
      ui::mojom::MenuSourceType source_type) = 0;

  // Returns True if the last event passing through app list was a key event.
  // This is stored in the controller and managed by the presenter.
  virtual bool KeyboardTraversalEngaged() = 0;

  // Checks if we are allowed to process events on the app list main view and
  // its descendants.
  virtual bool CanProcessEventsOnApplistViews() = 0;

  // Returns whether the app list should dismiss immediately. For example, when
  // the assistant takes a screenshot the app list is closed immediately so it
  // doesn't appear in the screenshot.
  virtual bool ShouldDismissImmediately() = 0;

  // Returns the AssistantViewDelegate.
  virtual AssistantViewDelegate* GetAssistantViewDelegate() = 0;

  // Called if a search result has its visibility updated and wants to
  // be notified (i.e. its notify_visibility_change() returns true).
  virtual void OnSearchResultVisibilityChanged(const std::string& id,
                                               bool visibility) = 0;

  // Returns true if the Assistant feature is allowed and enabled.
  virtual bool IsAssistantAllowedAndEnabled() const = 0;

  // Gets the app list page currently shown in the fullscreen app list, as
  // reported from the app list view using `OnAppListPageChanged()`.
  virtual AppListState GetCurrentAppListPage() const = 0;

  // Called when the page shown in the app list contents view is updated.
  virtual void OnAppListPageChanged(AppListState page) = 0;

  // Gets the current app list view state, as reported by app list view using
  // `OnViewStateChanged()`. Tracked for fullscreen app list view only.
  virtual AppListViewState GetAppListViewState() const = 0;

  // Called when the app list view state is updated.
  virtual void OnViewStateChanged(AppListViewState state) = 0;

  // Called when the app list state transition animation is completed.
  virtual void OnStateTransitionAnimationCompleted(
      AppListViewState state,
      bool was_animation_interrupted) = 0;

  // Fills the given AppLaunchedMetricParams with info known by the delegate.
  virtual void GetAppLaunchedMetricParams(
      AppLaunchedMetricParams* metric_params) = 0;

  // Adjusts the bounds by snapping it to the edge of the display in pixel
  // space. This prevents 1px gaps on displays with non-integer scale factors.
  virtual gfx::Rect SnapBoundsToDisplayEdge(const gfx::Rect& bounds) = 0;

  // Returns whether the app list is visible on the display. This checks that
  // the app list windows is open and not obstructed by another window.
  virtual bool AppListTargetVisibility() const = 0;

  // Gets the current shelf height (or width for side-shelf) from the
  // ShelfConfig.
  virtual int GetShelfSize() = 0;

  // Gets the tablet mode shelf insets from the ShelfConfig.
  virtual int GetSystemShelfInsetsInTabletMode() = 0;

  // Returns whether tablet mode is currently enabled.
  virtual bool IsInTabletMode() const = 0;

  // Loads the icon of an app item identified by `app_id`.
  virtual void LoadIcon(const std::string& app_id) = 0;

  // Whether the controller has a valid profile, and hence a valid data model.
  // Returns false during startup and shutdown.
  virtual bool HasValidProfile() const = 0;

  // Whether the user wants to hide the continue section and recent apps. Used
  // by productivity launcher only.
  virtual bool ShouldHideContinueSection() const = 0;

  // Sets whether the user wants to hide the continue section and recent apps.
  // Used by productivity launcher only.
  virtual void SetHideContinueSection(bool hide) = 0;

  // Returns whether the search category `category` is enabled.
  virtual bool IsCategoryEnabled(AppListSearchControlCategory category) = 0;

  // Sets the preference of displaying `category` to users to `enabled`.
  virtual void SetCategoryEnabled(AppListSearchControlCategory category,
                                  bool enabled) = 0;

  // Records metrics regarding the apps visibiity from the launcher's default
  // state. For example, for scrollable apps grid view, an item view would be
  // above the fold if it is visible without scrolling.
  virtual void RecordAppsDefaultVisibility(
      const std::vector<std::string>& apps_above_the_fold,
      const std::vector<std::string>& apps_below_the_fold,
      bool is_apps_collections_page) = 0;
};

}  // namespace ash

#endif  // ASH_APP_LIST_APP_LIST_VIEW_DELEGATE_H_