60 lines
2.1 KiB
Dart
60 lines
2.1 KiB
Dart
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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class FriendExpense {
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final String name;
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final double spent;
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final String note;
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FriendExpense({required this.name, required this.spent, this.note = ""});
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}
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class SplitterState {
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final List<FriendExpense> friends;
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SplitterState({this.friends = const []});
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}
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class SplitterNotifier extends StateNotifier<SplitterState> {
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SplitterNotifier() : super(SplitterState());
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void addFriend(String name, double spent, String note) {
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state = SplitterState(friends: [...state.friends, FriendExpense(name: name, spent: spent, note: note)]);
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}
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void removeFriend(int index) {
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var newList = List<FriendExpense>.from(state.friends);
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newList.removeAt(index);
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state = SplitterState(friends: newList);
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}
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List<String> calculateSettlements(double userSpent) {
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List<FriendExpense> all = [
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FriendExpense(name: "Io (Tu)", spent: userSpent, note: "Mio anticipo"),
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...state.friends
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];
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if (all.length < 2) return ["Aggiungi almeno un amico per il calcolo"];
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double totalSpent = all.fold(0, (sum, f) => sum + f.spent);
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double share = totalSpent / all.length;
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List<String> results = [
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"TOTALE: ${totalSpent.toStringAsFixed(2)}€",
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"QUOTA: ${share.toStringAsFixed(2)}€",
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"--------------------------------"
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];
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Map<String, double> balances = { for (var f in all) f.name: f.spent - share };
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var creditors = balances.entries.where((e) => e.value > 0.01).toList();
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var debtors = balances.entries.where((e) => e.value < -0.01).toList();
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int cIdx = 0, dIdx = 0;
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while (cIdx < creditors.length && dIdx < debtors.length) {
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double amount = (creditors[cIdx].value < -debtors[dIdx].value) ? creditors[cIdx].value : -debtors[dIdx].value;
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results.add("${debtors[dIdx].key} ➔ ${creditors[cIdx].key}: ${amount.toStringAsFixed(2)}€");
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if ((creditors[cIdx].value - amount).abs() < 0.01) cIdx++;
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if ((debtors[dIdx].value + amount).abs() < 0.01) dIdx++;
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}
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return results;
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}
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}
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final splitterProvider = StateNotifierProvider<SplitterNotifier, SplitterState>((ref) => SplitterNotifier());
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