mc_gallery/lib/features/home/views/gallery/gallery_view_model.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
import 'package:mc_gallery/features/core/services/app_lifecycle_service.dart';

import '/features/core/abstracts/base_view_model.dart';
import '/features/core/services/logging_service.dart';
import '/features/core/services/navigation_service.dart';
import '/features/home/data/models/image_model.dart';
import '/features/home/services/images_service.dart';
import '/features/home/views/image_carousel/image_carousel_view.dart';
import '/locator.dart';

class GalleryViewModel extends BaseViewModel {
  GalleryViewModel({
    required ImagesService imagesService,
    required NavigationService navigationService,
    required AppLifecycleService appLifecycleService,
    required LoggingService loggingService,
  })  : _imagesService = imagesService,
        _navigationService = navigationService,
        _appLifecycleService = appLifecycleService,
        _loggingService = loggingService;

  final ImagesService _imagesService;
  final NavigationService _navigationService;
  final AppLifecycleService _appLifecycleService;
  final LoggingService _loggingService;

  final ValueNotifier<bool> _isDisplayingPressingPrompt = ValueNotifier(true);
  ValueListenable<bool> get isDisplayingPressingPrompt => _isDisplayingPressingPrompt;

  @override
  Future<void> initialise(bool Function() mounted, [arguments]) async {
    _appLifecycleService.addListener(
      tag: runtimeType.toString(),
      listener: (final appLifecycleState) async {
        switch (appLifecycleState) {
          case AppLifecycleState.resumed:
            break;
          case AppLifecycleState.inactive:
          case AppLifecycleState.paused:
          case AppLifecycleState.detached:
            await DefaultCacheManager().emptyCache();
        }
      },
    );

    super.initialise(mounted, arguments);
  }

  @override
  Future<void> dispose() async {
    await _appLifecycleService.removeListener(tag: runtimeType.toString());

    super.dispose();
  }

  void onPromptPressed() => _isDisplayingPressingPrompt.value = false;

  Iterable<ImageModel> get imageModels => _imagesService.imageModels;

  void pushImageCarouselView(BuildContext context, {required ImageModel imageModel}) =>
      _navigationService.pushImageCarouselView(
        context,
        imageCarouselViewArguments: ImageCarouselViewArguments(
          imageIndexKey: imageModel.imageIndex,
        ),
      );

  static GalleryViewModel get locate => Locator.locate();

  double? downloadProgressValue({required DownloadProgress progress}) =>
      progress.totalSize != null ? progress.downloaded / progress.totalSize! : null;
}