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chart_elements_bloc.dart
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chart_elements_bloc.dart
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import 'package:bloc/bloc.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:shiori/domain/app_constants.dart';
import 'package:shiori/domain/enums/enums.dart';
import 'package:shiori/domain/extensions/double_extensions.dart';
import 'package:shiori/domain/models/models.dart';
import 'package:shiori/domain/services/genshin_service.dart';
part 'chart_elements_bloc.freezed.dart';
part 'chart_elements_event.dart';
part 'chart_elements_state.dart';
class ChartElementsBloc extends Bloc<ChartElementsEvent, ChartElementsState> {
final GenshinService _genshinService;
final List<double> versions;
ChartElementsBloc(this._genshinService)
: versions = _genshinService.bannerHistory.getBannerHistoryVersions(SortDirectionType.asc),
super(const ChartElementsState.loading());
@override
Stream<ChartElementsState> mapEventToState(ChartElementsEvent event) async* {
final s = event.map(
init: (e) => _init(e.maxNumberOfColumns),
elementSelected: (e) => state.maybeMap(
loaded: (state) => _elementSelectionChanged(state, e.type),
orElse: () => throw Exception('Invalid state'),
),
goToNextPage: (e) => state.maybeMap(
loaded: _goToNextPage,
orElse: () => throw Exception('Invalid state'),
),
goToPreviousPage: (e) => state.maybeMap(
loaded: _goToPreviousPage,
orElse: () => throw Exception('Invalid state'),
),
goToFirstPage: (e) => state.maybeMap(
loaded: (state) => _goToFirstOrLastPage(state, true),
orElse: () => throw Exception('Invalid state'),
),
goToLastPage: (e) => state.maybeMap(
loaded: (state) => _goToFirstOrLastPage(state, false),
orElse: () => throw Exception('Invalid state'),
),
);
yield s;
}
//Some versions were skipped (e.g: 1.7, 1.8, 1.9), that's why we use this function
//to determine if the version can be skipped or no
bool isValidVersion(double value) {
return versions.contains(value.truncateToDecimalPlaces());
}
ChartElementsState _init(int maxNumberOfColumns) {
if (maxNumberOfColumns < 1) {
throw Exception('The provided maxNumberOfColumns = $maxNumberOfColumns is not valid');
}
final firstVersion = versions.first;
double lastVersion = firstVersion + _getStep(maxNumberOfColumns);
if (lastVersion > versions.last) {
lastVersion = versions.last;
}
final elements = _genshinService.bannerHistory.getElementsForCharts(firstVersion, lastVersion);
return ChartElementsState.loaded(
maxNumberOfColumns: maxNumberOfColumns,
firstVersion: firstVersion,
lastVersion: lastVersion,
elements: elements,
filteredElements: elements,
canGoToFirstPage: _canGoToFirstPage(firstVersion),
canGoToLastPage: _canGoToLastPage(lastVersion),
canGoToNextPage: _canGoToNextPage(lastVersion),
canGoToPreviousPage: _canGoToPreviousPage(firstVersion),
);
}
ChartElementsState _elementSelectionChanged(_LoadedState state, ElementType type) {
final selectedTypes = [...state.selectedElementTypes];
if (selectedTypes.contains(type)) {
selectedTypes.remove(type);
} else {
selectedTypes.add(type);
}
return state.copyWith(selectedElementTypes: selectedTypes, filteredElements: _getFilteredElements(state.elements, selectedTypes));
}
List<ChartElementItemModel> _getFilteredElements(List<ChartElementItemModel> elements, List<ElementType> selectedTypes) =>
selectedTypes.isEmpty ? elements : elements.where((el) => selectedTypes.contains(el.type)).toList();
double _getStep(int maxNumberOfColumns) => maxNumberOfColumns * gameVersionIncrementsBy;
ChartElementsState _goToFirstOrLastPage(_LoadedState state, bool toFirstPage) {
final firstVersion = versions.first;
if (toFirstPage) {
return _newVersionChanged(state, firstVersion);
}
final fromVersion = versions.last - _getStep(state.maxNumberOfColumns);
return _newVersionChanged(state, fromVersion);
}
ChartElementsState _goToNextPage(_LoadedState state) {
if (!_canGoToNextPage(state.lastVersion)) {
throw Exception('Cannot go to the next page');
}
final newVersion = (state.firstVersion + gameVersionIncrementsBy).truncateToDecimalPlaces();
return _newVersionChanged(state, newVersion);
}
ChartElementsState _goToPreviousPage(_LoadedState state) {
if (!_canGoToPreviousPage(state.firstVersion)) {
throw Exception('Cannot go to the previous page');
}
final newVersion = (state.firstVersion - gameVersionIncrementsBy).truncateToDecimalPlaces();
return _newVersionChanged(state, newVersion);
}
ChartElementsState _newVersionChanged(_LoadedState state, double newFirstVersion) {
final step = _getStep(state.maxNumberOfColumns);
double newLastVersion = (newFirstVersion + step).truncateToDecimalPlaces();
if (newLastVersion > versions.last) {
newLastVersion = versions.last;
}
if (newFirstVersion < versions.first) {
throw Exception('First version = $newFirstVersion cannot be greater than = ${versions.first}');
}
if (newLastVersion > versions.last) {
throw Exception('Last version = $newLastVersion cannot be greater than = ${versions.last}');
}
if (state.firstVersion == newFirstVersion && state.lastVersion == newLastVersion) {
throw Exception('The state already has the same first and last version');
}
assert(newFirstVersion != newLastVersion, 'New and last version cannot be equal');
final elements = _genshinService.bannerHistory.getElementsForCharts(newFirstVersion, newLastVersion);
return state.copyWith(
elements: elements,
filteredElements: _getFilteredElements(elements, state.selectedElementTypes),
firstVersion: newFirstVersion,
lastVersion: newLastVersion,
canGoToFirstPage: _canGoToFirstPage(newFirstVersion),
canGoToLastPage: _canGoToLastPage(newLastVersion),
canGoToNextPage: _canGoToNextPage(newLastVersion) && _canGoToLastPage(newLastVersion),
canGoToPreviousPage: _canGoToPreviousPage(newFirstVersion) && _canGoToFirstPage(newFirstVersion),
);
}
bool _canGoToFirstPage(double version) => version > versions.first;
bool _canGoToNextPage(double version) => version + gameVersionIncrementsBy <= versions.last;
bool _canGoToPreviousPage(double version) => version - gameVersionIncrementsBy >= versions.first;
bool _canGoToLastPage(double version) => version < versions.last;
}