Basic budget sliders

lib/domains/budget/budget_bloc.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:equatable/equatable.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:tunas/repositories/metadata/models/budget.dart';
@@ -11,6 +13,11 @@ class BudgetBloc extends Bloc<BudgetEvent, BudgetState> {
 
   BudgetBloc({required MetadataRepository metadataRepository}) : _metadataRepository = metadataRepository, super(const BudgetState())  {
     on<BudgetsLoad>(_onBudgetsLoad);
+    on<BudgetAdd>(_onBudgetAdd);
+    on<BudgetRemove>(_onBudgetRemove);
+    on<BudgetSetValue>(_onBudgetSetValue);
+    on<BudgetCompareNext>(_onBudgetCompareNext);
+    on<BudgetComparePrevious>(_onBudgetComparePrevious);
 
     _metadataRepository
       .getBudgetsStream()
@@ -24,4 +31,68 @@ class BudgetBloc extends Bloc<BudgetEvent, BudgetState> {
       budgets: event.budgets,
     ));
   }
+
+  FutureOr<void> _onBudgetAdd(BudgetAdd event, Emitter<BudgetState> emit) async {
+    Budget budget = Budget(
+      label: event.label,
+    );
+
+    emit(_computeState(await _saveBudget(budget)));
+  }
+
+  FutureOr<void> _onBudgetRemove(BudgetRemove event, Emitter<BudgetState> emit) async {
+    List<Budget> budgets = _metadataRepository.getBudgets();
+    Budget budgetToRemove = event.budget;
+
+    budgets.removeWhere((budget) => budget.label == budgetToRemove.label);
+    emit(_computeState(await _metadataRepository.saveBudgets(budgets)));
+  }
+
+  FutureOr<void> _onBudgetSetValue(BudgetSetValue event, Emitter<BudgetState> emit) async {
+    Budget budgetToUpdate = event.budget;
+
+    if (state.remainingBudget - (event.value - budgetToUpdate.value) < 0) {
+      return;
+    }
+
+    // if (state.remainingBudget - event.value < 0 && state.remainingBudget < 10) {
+    //   budgetToUpdate.value = 
+    // } else {
+    //   budgetToUpdate.value = event.value;
+    // }
+    budgetToUpdate.value = event.value;
+
+    emit(_computeState(await _saveBudget(budgetToUpdate)));
+  }
+
+  FutureOr<void> _onBudgetCompareNext(BudgetCompareNext event, Emitter<BudgetState> emit) {
+  }
+
+  FutureOr<void> _onBudgetComparePrevious(BudgetComparePrevious event, Emitter<BudgetState> emit) {
+  }
+
+  Future<List<Budget>> _saveBudget(Budget budgetToSave) async {
+    List<Budget> budgets = _metadataRepository.getBudgets();
+
+    try {
+      Budget budgetFound = budgets.firstWhere((category) => category.label == budgetToSave.label);
+      budgetFound.value = budgetToSave.value;
+    } catch (e) {
+      if (budgets.isEmpty) {
+        budgets = [budgetToSave];
+      } else {
+        budgets.add(budgetToSave);
+      }
+    }
+
+    // _metadataRepository.saveBudgets(budgets);
+    return budgets;
+  }
+
+  BudgetState _computeState(List<Budget> budgets) {
+    return state.copyWith(
+      budgets: budgets,
+      remainingBudget: state.initialBudget - budgets.map((budget) => budget.value).reduce((value, element) => value + element),
+    );
+  }
 }