// 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.

module ash.mojom;

import "ash/public/interfaces/menu.mojom";
import "components/sync/mojo/syncer.mojom";
import "mojo/public/mojom/base/string16.mojom";
import "mojo/public/mojom/base/unguessable_token.mojom";
import "ui/gfx/geometry/mojo/geometry.mojom";
import "ui/gfx/image/mojo/image.mojom";
import "ui/gfx/range/mojo/range.mojom";

// A structure holding the common information which is sent between ash and,
// chrome representing an app list item.
// This structure should be kept as small as possible so that minimum data
// is sent via mojo calls when an item is moved or reparented.
struct AppListItemMetadata {
  string id;          // The id of the app list item.
  string name;        // The corresponding app or folder's name of the item.
  string short_name;  // The corresponding app's short name of the item. It's
                      // empty if the app doesn't have one or it's a folder.
  string folder_id;   // The id of the item's folder.
  syncer.mojom.StringOrdinal position; // The position of the item.
  bool is_folder;     // Whether this item is a folder.
  gfx.mojom.ImageSkia? icon;  // The icon of this item.
  bool is_page_break; // Whether this item is a "page break" item.
};

// A structure holding the common information which is sent from chrome to ash,
// representing a search result.
// This structure should be kept as small as possible so that ash can get and
// render search results as early as possible.
struct SearchResultMetadata {
  string id;                  // The id of the result.
  mojo_base.mojom.String16 title;    // The title of the result, e.g. an app's
                                     // name, an autocomplete query, etc.
  mojo_base.mojom.String16 details;  // A detail string of this result.
  array<SearchResultTag> title_tags;    // How the title matches the query. See
                                        // the SearchResultTag section for
                                        // more details.
  array<SearchResultTag> details_tags;  // How the details match the query. See
                                        // the SearchResultTag section for
                                        // more details.
  array<SearchResultAction> actions;    // Actions that can be performed on this
                                        // result. See the SearchResultAction
                                        // section for more details.
  float rating = -1.0;        // The average rating score of the app
                              // corresponding to this result, ranged from 0 to
                              // 5. It's negative if there's no rating for the
                              // result.
  mojo_base.mojom.String16 formatted_price;  // A formatted price string, e.g.
                                             // "$7.09", "HK$3.94", etc.
  SearchResultType result_type;              // The type of this result.
  SearchResultDisplayType display_type = kList;
                                             // How this result is displayed.
  double display_score;       // A score to determine the result display order.
  bool is_omnibox_search;     // Whether this result is searched from Omnibox.
  bool is_installing;         // Whether this result is installing.
  mojo_base.mojom.UnguessableToken? answer_card_contents_token;
                              // A token used to render answer card, which is
                              // empty before initialized. It's illegal to pass
                              // an empty UnguessableToken across processes. So
                              // we use a null value when it's empty here.
  gfx.mojom.Size? answer_card_size;  // Preferred size of answer card. It is
                                     // unset for non-answer-card results. For
                                     // answer card results, it is set when
                                     // the answer card WebContents finishes
                                     // loading and its renderer notifies it
                                     // about a new contents size.
  gfx.mojom.ImageSkia? icon;  // The icon of this result.
  gfx.mojom.ImageSkia? badge_icon;  // The badge icon of this result that
                                    // indicates its type, e.g. installable from
                                    // PlayStore, installable from WebStore,
                                    // etc.
};

// All possible states of the app list.
enum AppListState {
  kStateApps = 0,
  kStateSearchResults,
  kStateStart,
};

// The status of the app list model.
enum AppListModelStatus {
  kStatusNormal,
  kStatusSyncing,  // Syncing apps or installing synced apps.
};

// How the result should be displayed. Do not change the order of these as
// they are used for metrics.
enum SearchResultDisplayType {
  kNone = 0,
  kList,
  kTile,
  kRecommendation,
  kCard,
  // Add new values here.
};

// Type of the search result, which is set in Chrome.
enum SearchResultType {
  kInstalledApp,    // Installed apps.
  kPlayStoreApp,    // Installable apps from PlayStore.
  kInstantApp,      // Instant apps.
  kInternalApp,     // Chrome OS apps.
  kWebStoreApp,     // Installable apps from WebStore.
  kWebStoreSearch,  // A search query in WebStore.
  kOmnibox,         // Results from Omninbox.
  kLauncher,        // Results from launcher search (currently only from Files).
  kAnswerCard,      // WebContents based answer card.
  // Add new values here.
};

// A tagged range in search result text.
struct SearchResultTag {
  // Similar to ACMatchClassification::Style, the style values are not
  // mutually exclusive.
  int16 styles;
  gfx.mojom.Range range;
};

// Data representing an action that can be performed on a search result.
// An action could be represented as an icon set or as a blue button with
// a label. Icon set is chosen if label text is empty. Otherwise, a blue
// button with the label text will be used.
struct SearchResultActionImageLabel {
  gfx.mojom.ImageSkia base_image;
  gfx.mojom.ImageSkia hover_image;
  gfx.mojom.ImageSkia pressed_image;
};
union SearchResultActionLabel {
  SearchResultActionImageLabel image_label;
  mojo_base.mojom.String16 text_label;
};
struct SearchResultAction {
  mojo_base.mojom.String16 tooltip_text;
  SearchResultActionLabel label;
};

// The Chrome app list (aka Launcher), is the place where user can find and
// organize all installed apps, or search for various types of information.
//
// For apps:
// The app list displays apps synced across devices based on a user account, in
// an order that can be modified by the user. It supports up-to-3-layer app
// organization, the root app list, folders, and apps:
// - Each app can stay in the root app list or a folder.
// - Each folder holds more than one apps, which means it'll automatically get
//   removed when there's only one app left in it.
// - The OEM folder is a special folder where we cannot move items to/from it.
//   And we cannot rename it.
// - Other folders are renamable.
// - Folders cannot hold folders.
// - Different items/folders never have a same GUID.
// - Every item/folder has a same GUID on different devices.
//
// For searching:
// The app list supports various kinds of searching (e.g. apps, onmibox, etc).
// And search results can be displayed in different formats (e.g. tiles, cards).
// - Result ids are url like string, e.g.
//   "chrome-extension://mgndgikekgjfcpckkfioiadnlibdjbkf/",
//   "play://hhbckbkcbnemggclionhhgaceohjfdkl", etc.
// - Different search results never have a same id.
// - Every search result has a same id on different devices.
// - Every search result can have a list of actions (e.g. install), see
//   app_list::SearchResult::Action.
//
// Users can long press on any app list item or search result to show a context
// menu. A context menu has a list of commands (e.g. open, uninstall, etc.).
// - Different items/results may have different command lists.
// - Each item/result usually has a same command list, but not always. Consider
//   when we pin an app to the shelf and when we unpin it, the context menu
//   looks different.
// - Inside each command list, each command has its own unique command id.
// - A same command in different command lists has a unique command id, see
//   app_list::AppContextMenu::CommandId.

// The Chrome app list has its UI running in Ash, and everything else running in
// Chrome (e.g. syncing, user profile, etc). This controller is implemented in
// Ash to handle calls from Chrome. These include:
// - When app list data changes in Chrome, it should notifies the UI models and
//   views in Ash to get updated. This can happen while syncing, searching, etc.
// - When Chrome needs real-time UI information from Ash. This can happen while
//   calculating recommended search results based on the app list item order.
// - When app list states in Chrome change that require UI's response. This can
//   happen while installing/uninstalling apps and the app list gets toggled.
interface AppListController {
  // Sets a client to handle calls from Ash.
  SetClient(AppListClient client);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces that come from AppListModelUpdater:
  // The following interfaces are called to update the app list model in Ash,
  // including both the app list item model, search result model and search box
  // model.
  // Adds an item to AppListModel.
  AddItem(AppListItemMetadata app_item);
  // Adds an item into a certain folder in AppListModel.
  AddItemToFolder(AppListItemMetadata app_item, string folder_id);
  // Removes an item by its id from AppListModel.
  RemoveItem(string id);
  // Removes an item by its id, and also cleans up if its parent folder has a
  // single child left.
  RemoveUninstalledItem(string id);
  // Moves the item with |id| to the folder with |folder_id|.
  MoveItemToFolder(string id, string folder_id);
  // Tells Ash what the current status of AppListModel should be,
  // e.g. the model is under synchronization or in normal status.
  SetStatus(AppListModelStatus status);
  // Tells Ash what the current state of the app list should be,
  // e.g. the user is searching for something, or showing apps, etc.
  SetState(AppListState state);
  // Highlights the given item in the app list. If not present and it is later
  // added, the item will be highlighted after being added.
  HighlightItemInstalledFromUI(string id);
  // Sets whether the search engine is Google or not.
  SetSearchEngineIsGoogle(bool is_google);
  // Sets the text for screen readers on the search box, and updates the
  // accessible names.
  SetSearchTabletAndClamshellAccessibleName(
      mojo_base.mojom.String16 tablet_accessible_name,
      mojo_base.mojom.String16 clamshell_accessible_name);
  // Sets the hint text to display when there is in input.
  SetSearchHintText(mojo_base.mojom.String16 hint_text);
  // Sets the text for the search box's Textfield and the voice search flag.
  UpdateSearchBox(mojo_base.mojom.String16 text, bool initiated_by_user);
  // Publishes search results to Ash to render them.
  PublishSearchResults(array<SearchResultMetadata> results);
  // Update the whole model, usually when profile changes happen in Chrome.
  SetModelData(array<AppListItemMetadata> apps,
               bool is_search_engine_google);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces only used by ChromeAppListItem:
  // These interfaces are called when an item's data is updated in Chrome.
  // Updates an item's metadata (e.g. name, position, etc).
  SetItemMetadata(string id, AppListItemMetadata metadata);
  // Updates an item's icon.
  SetItemIcon(string id, gfx.mojom.ImageSkia? icon);
  // Updates whether an item is installing.
  SetItemIsInstalling(string id, bool is_installing);
  // Updates the downloaded percentage of an item.
  SetItemPercentDownloaded(string id, int32 percent_downloaded);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces for item querying:
  // Returns a map from each item's id to its shown index in the app list.
  GetIdToAppListIndexMap() => (map<string, uint16> indices);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces for AppListSyncableService:
  // These interfaces are called while dealing with the OEM folder in the
  // AppListSyncableService in Chrome.
  // Finds the OEM folder or creates one if it doesn't exist.
  // |oem_folder_name|: the expected name of the OEM folder while creating.
  // |preferred_oem_position|: the preferred position of the OEM folder while
  //                           creating; if it's invalid then the final position
  //                           is determined in Ash.
  // |oem_folder|: the meta data of the existing/created OEM folder.
  FindOrCreateOemFolder(
      string oem_folder_name,
      syncer.mojom.StringOrdinal preferred_oem_position)
      => (AppListItemMetadata oem_folder);
  // Resolves the position of the OEM folder.
  // |preferred_oem_position|: the preferred position of the OEM folder; if it's
  //                           invalid then the final position is determined in
  //                           Ash.
  // |oem_folder|: the meta data of the OEM folder, or null if it doesn't exist.
  ResolveOemFolderPosition(
      syncer.mojom.StringOrdinal preferred_oem_position)
      => (AppListItemMetadata? oem_folder);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces for ChromeSearchReult:
  SetSearchResultMetadata(SearchResultMetadata metadata);
  SetSearchResultIsInstalling(string result_id, bool is_installing);
  SetSearchResultPercentDownloaded(string result_id, int32 percent_downloaded);
  NotifySearchResultItemInstalled(string result_id);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces for views:
  // Dismisses the app list.
  DismissAppList();
  // Returns bounds of a rectangle to show an AppInfo dialog.
  GetAppInfoDialogBounds() => (gfx.mojom.Rect bounds);
  // Shows the app list and switches to |state|.
  ShowAppListAndSwitchToState(AppListState state);
  // Shows the app list.
  ShowAppList();
};

// In contrast to AppListController, this client is implemented in Chrome to
// handle calls from Ash. These include:
// - When Chrome components are needed to get involved in the user's actions on
//   app list views. This can happen while the user is searching, clicking on
//   any app list item, etc.
// - When view changes in Ash and we want to notify Chrome. This can happen
//   while app list is performing animations.
// - When a user action on views need information from Chrome to complete. This
//   can happen while populating context menu models, which depends on item data
//   in Chrome.
interface AppListClient {
  //////////////////////////////////////////////////////////////////////////////
  // Interfaces on searching:
  // Triggers a search query.
  // |trimmed_query|: the trimmed input texts from the search text field.
  StartSearch(mojo_base.mojom.String16 trimmed_query);
  // Opens a search result when its view is clicked or pressed.
  // |result_id|: the id of the search result the user wants to open.
  OpenSearchResult(string result_id, int32 event_flags);
  // Invokes a custom action on a result with |result_id|.
  // |action_index| corresponds to the index of an action on the search result,
  // for example, installing. They are stored in SearchResult::actions_.
  InvokeSearchResultAction(string result_id,
                           int32 action_index,
                           int32 event_flags);
  // Returns the context menu model for the search result with |result_id|, or
  // an empty array if there is currently no menu for the result.
  GetSearchResultContextMenuModel(string result_id) => (array<MenuItem> items);
  // Invoked when a context menu item of a search result is clicked.
  // |result_id|: the clicked search result's id.
  // |command_id|: the clicked menu item's command id.
  // |event_flags|: flags from the event which triggered this command.
  SearchResultContextMenuItemSelected(string result_id,
                                      int32 command_id,
                                      int32 event_flags);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces on the app list UI:
  // Invoked when the app list is shown in the display with |display_id|.
  ViewShown(int64 display_id);
  // Invoked when the app list is closed.
  ViewClosing();
  // Notifies target visibility changes of the app list.
  OnAppListTargetVisibilityChanged(bool visible);
  // Notifies visibility changes of the app list.
  OnAppListVisibilityChanged(bool visible);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces on app list items:
  // Activates (opens) the item with |id|.
  ActivateItem(string id, int32 event_flags);
  // Returns the context menu model for the item with |id|, or an empty array if
  // there is currently no menu for the item (e.g. during install).
  GetContextMenuModel(string id) => (array<MenuItem> items);
  // Invoked when a context menu item of an app list item is clicked.
  // |id|: the clicked AppListItem's id.
  // |command_id|: the clicked menu item's command id.
  // |event_flags|: flags from the event which triggered this command.
  ContextMenuItemSelected(string id, int32 command_id, int32 event_flags);
  // Invoked when a folder is created in Ash (e.g. merge items into a folder).
  OnFolderCreated(AppListItemMetadata folder);
  // Invoked when a folder has only one item left and so gets removed.
  OnFolderDeleted(AppListItemMetadata folder);
  // Invoked when user changes a folder's name or an item's position.
  OnItemUpdated(AppListItemMetadata folder);
  // Invoked when a "page break" item is added with |id| and |position|.
  OnPageBreakItemAdded(string id, syncer.mojom.StringOrdinal position);

  //////////////////////////////////////////////////////////////////////////////
  // Interfaces on voice interaction:
  // Starts a voice interaction session.
  StartVoiceInteractionSession();
  // Starts or stops voice interaction session based on current state.
  ToggleVoiceInteractionSession();
};