import 'dart:io';

void main() {
List<Map<String, double>> incomeList = [];
List<Map<String, double>> expenseList = [];

print("Welcome to the Budget Management Application!");

while (true) {
print("\n1. Add income");
print("2. Add expense");
print("3. View summary");
print("4. Exit");

stdout.write("Enter your choice: ");
String? choice = stdin.readLineSync();

if (choice == "4") {
print("Exiting the application. Goodbye!");
break;
}

switch (choice) {
case "1":
stdout.write("Enter income description: ");
String? desc = stdin.readLineSync();
stdout.write("Enter income amount: ");
double? amount = double.tryParse(stdin.readLineSync() ?? "");
if (amount != null && amount >= 0) {
incomeList.add({desc ?? "Income": amount});
print("Income added!");
} else {
print("Invalid amount!");
}
break;

case "2":
stdout.write("Enter expense description: ");
String? desc = stdin.readLineSync();
stdout.write("Enter expense amount: ");
double? amount = double.tryParse(stdin.readLineSync() ?? "");
if (amount != null && amount >= 0) {
expenseList.add({desc ?? "Expense": amount});
print("Expense added!");
} else {
print("Invalid amount!");
}
break;

case "3":
double totalIncome = 0;
double totalExpense = 0;

for (var entry in incomeList) totalIncome += entry.values.first;
for (var entry in expenseList) totalExpense += entry.values.first;

double netProfit = totalIncome - totalExpense;
double tax = netProfit > 0 ? netProfit * 0.15 : 0;

print("\nSummary:");
print("Total income: \$${totalIncome.toStringAsFixed(2)}");
print("Total expenses: \$${totalExpense.toStringAsFixed(2)}");

if (netProfit >= 0) {
print("Net profit: \$${netProfit.toStringAsFixed(2)}");
print("Tax to be paid: \$${tax.toStringAsFixed(2)}");
} else {
print("Net loss: \$${netProfit.toStringAsFixed(2)}");
}
break;

default:
print("Invalid choice!");
}
}
}