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// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:typed_data';
import 'package:fidl_fuchsia_modular/fidl_async.dart' as modular;
import 'package:fuchsia_services/services.dart';
import 'package:meta/meta.dart';
import '../entity/entity.dart';
import 'embedded_module.dart';
import 'intent_handler.dart';
import 'internal/_intent_handler_impl.dart';
import 'internal/_module_impl.dart';
import 'ongoing_activity.dart';
/// The [Module] class provides a mechanism for module authors
/// to interact with the underlying framework. The main responsibilities
/// of the [Module] class are to implement the intent handler
/// interface and the lifecycle interface.
abstract class Module {
static Module _module;
/// returns a shared instance of this.
factory Module() {
return _module ??= ModuleImpl(
IntentHandlerImpl(startupContext: StartupContext.fromStartupInfo()),
/// Starts a new Module instance and adds it to the story. The Module to
/// execute is identified by the contents of [intent] and the Module instance
/// is given a [name] in the scope of the starting Module instance. The view
/// for the Module is given to the StoryShell for display.
/// Providing a [surfaceRelation] advises the StoryShell on how to layout
/// surfaces that the new module creates. If [surfaceRelation] is `null` then
/// a default relation is used. Note, [surfaceRelation] is an optional
/// parameter so a default value will be provided:
/// ```
/// modular.SurfaceRelation surfaceRelation = modular.SurfaceRelation(
/// arrangement: modular.SurfaceArrangement.copresent,
/// dependency: modular.SurfaceDependency.dependent,
/// emphasis: 0.5,
/// )
/// If this method is called again with the same [name] by the same Module
/// instance, but with different arguments, a new module will be started and
/// replace the existing one (the ModuleController of the existing module will
/// be closed). If the [intent] is resolved to the same module, the module
/// will get the intent.
/// A [modular.ModuleController] is returned to the caller to control the start
/// Module instance. Closing this connection doesn't affect its Module
/// instance; it just relinquishes the ability of the caller to control the
/// Module instance.
/// The [name] parameter can be used identify a view in the resulting story
/// and can be used to either update a running module with a new [intent] or
/// can be used to replace an existing module in the same space if the intent
/// resolves to a new module instance.
/// ```
/// // This code will result in one view being displayed on
/// // screen with either one module receiving two intents if the
/// // intents resolve to the same module binaries or one module
/// // being started and then torn down to start a new module.
/// Module().addModuleToStory(name: 'foo', intent: foo_intent);
/// Module().addModuleToStory(name: 'foo', intent: bar_intent);
/// ```
/// ```
/// // This code will result in two views being displayed on
/// // screen. They may be the same binary but two different processes
/// // or they may be two binaries depending on how what modules
/// // are resolved.
/// Module().addModuleToStory(name: 'foo', intent: foo_intent);
/// Module().addModuleToStory(name: 'bar', intent: bar_intent);
/// ```
Future<modular.ModuleController> addModuleToStory({
@required String name,
@required modular.Intent intent,
modular.SurfaceRelation surfaceRelation,
/// Creates an entity that will live for the lifetime of the story.
/// The entity that is created will be backed by the framework and
/// can be treated as if it was received from any other entity provider.
Future<Entity> createEntity({
@required String type,
@required Uint8List initialData,
/// This method functions similarly to [addModuleToStory()], but instead
/// of relying on the story shell for display it is up to the caller to
/// display the view from the new module.
/// The method will complete with an [EmbeddedModule] which contains the
/// [modular.ModuleController] and the [views.ViewHolderToken].
/// The token can be used to embed the child module's view to display in your
/// module's view hierarchy. This is commonly done in Flutter modules with
/// the ChildView widget.
/// If no modules are found a [ModuleResolutionException] will be thrown.
Future<EmbeddedModule> embedModule({
@required String name,
@required modular.Intent intent,
/// TEMPORARY, for transition purposes only.
Future<EmbeddedModule> embedModuleNew({
@required String name,
@required modular.Intent intent,
/// Registers the [intentHandler] with this.
/// This method must be called in the main function of the module
/// so the framework has a chance to connect the intent handler.
/// ```
/// void main(List<String> args) {
/// Module()
/// ..registerIntentHandler(MyHandler());
/// }
/// ```
void registerIntentHandler(IntentHandler intentHandler);
/// When [RemoveSelfFromStory()] is called the framework will stop the
/// module and remove it from the story. If there are no more running modules
/// in the story the story will be stopped.
void removeSelfFromStory();
/// Requests that the current story and module gain focus. It's up to the
/// story shell and session shell to honor that request.
void requestFocus();
/// Declares that activity of the given [type] is ongoing in this module.
/// Modules should call [OngoingActivity.done] when the ongoing activity has
/// stopped. Pausing media should count as a stopped ongoing activity, and
/// when it is resumed it should be started as a new ongoing activity.
/// Conversely, media playing in a continuous playlist (i.e playing the next
/// video or song) should be treated as the same ongoing activity. Modules
/// must request a connection per ongoing activity; a single connection may
/// not be re-used for multiple ongoing activities.
/// When an module indicates that it is performing an ongoing activity the
/// system can make informed decisions about power/memory management. For
/// example, if the module indicates that it is playing a video the system
/// can prevent the display from dimming when not in use.
OngoingActivity startOngoingActivity(modular.OngoingActivityType type);