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import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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import '/features/core/abstracts/base_view_model.dart';
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import '/features/core/services/logging_service.dart';
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import '/features/core/services/navigation_service.dart';
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import '/features/home/data/models/image_model.dart';
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import '/features/home/services/image_cache_manager_service.dart';
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import '/features/home/services/images_service.dart';
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import '/features/home/views/image_carousel/image_carousel_view.dart';
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import '/locator.dart';
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import '../../data/enums/search_option.dart';
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class GalleryViewModel extends BaseViewModel {
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GalleryViewModel({
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required ImagesService imagesService,
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required NavigationService navigationService,
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required ImageCacheManagerService imageCacheManagerService,
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required LoggingService loggingService,
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}) : _imagesService = imagesService,
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_navigationService = navigationService,
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_imageCacheManagerService = imageCacheManagerService,
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_loggingService = loggingService;
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final ImagesService _imagesService;
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final NavigationService _navigationService;
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final ImageCacheManagerService _imageCacheManagerService;
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final LoggingService _loggingService;
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final ValueNotifier<bool> _isDisplayingPressingPrompt = ValueNotifier(true);
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ValueListenable<bool> get isDisplayingPressingPrompt => _isDisplayingPressingPrompt;
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final ValueNotifier<bool> _isSearchingNotifier = ValueNotifier(false);
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ValueListenable<bool> get isSearchingListenable => _isSearchingNotifier;
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final ValueNotifier<SearchOption> _searchOptionNotifier = ValueNotifier(SearchOption.web);
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ValueListenable<SearchOption> get searchOptionListenable => _searchOptionNotifier;
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final ValueNotifier<List<ImageModel>> _imageSearchResultsNotifier = ValueNotifier([]);
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ValueListenable<List<ImageModel>> get imageSearchResultsListenable => _imageSearchResultsNotifier;
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@override
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Future<void> initialise(bool Function() mounted, [arguments]) async {
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super.initialise(mounted, arguments);
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}
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@override
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Future<void> dispose() async {
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super.dispose();
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}
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Future<void> onSearchTermUpdate(String searchTerm) async {
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// If empty-string (from backspacing) -> reset state.
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if (searchTerm.isEmpty) {
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_imageSearchResultsNotifier.value = [];
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return;
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}
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// Detached call to prevent UI blocking
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unawaited(_imagesService
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.searchImages(
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imageNamePart: searchTerm,
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searchOption: searchOptionListenable.value,
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)
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.then(
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(final fetchedImageModels) => _imageSearchResultsNotifier.value = fetchedImageModels));
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// Force-update to trigger listening to `lastQueryResultDone()`.
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_imageSearchResultsNotifier.notifyListeners();
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}
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void searchPressed() {
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// If transitioning from 'Searching', clear previous results immediately
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if (_isSearchingNotifier.value) _imageSearchResultsNotifier.value = [];
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_isSearchingNotifier.value = !_isSearchingNotifier.value;
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}
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Future<void> get lastQueryResultDone => _imagesService.lastQueryIsCompleted;
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void onSearchOptionChanged(SearchOption? option) => _searchOptionNotifier.value = option!;
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void onPromptPressed() => _isDisplayingPressingPrompt.value = false;
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Iterable<ImageModel> get imageModels => _imagesService.imageModels;
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Future<void> get initImageFetchIsDone => _imagesService.initAwaiter;
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double? downloadProgressValue({required DownloadProgress progress}) =>
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progress.totalSize != null ? progress.downloaded / progress.totalSize! : null;
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void pushImageCarouselView(BuildContext context, {required ImageModel imageModel}) =>
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_navigationService.pushImageCarouselView(
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context,
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imageCarouselViewArguments: ImageCarouselViewArguments(
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imageIndexKey: imageModel.imageIndex,
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),
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);
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static GalleryViewModel get locate => Locator.locate();
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}
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