import 'dart:io';

void main() {

List<Map<String, dynamic>> incomeList = [];
List<Map<String, dynamic>> expenseList = [];

while (true) {

print("\nWelcome to the Budget Management Application!");
print("1. Add income");
print("2. Add expense");
print("3. View summary");
print("4. Exit");

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

if (choice == "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) {
print("Invalid amount!");
} else {
incomeList.add({
"description": desc,
"amount": amount
});
print("Income added!");
}

} else if (choice == "2") {

stdout . write("Enter expense description: ");
String? desc = stdinn.readLineSync();

stdout .write("Enter expense amount: ");
double? amount = double . try Parse(stdin .read Line Sync() ?? "");

if (amount == null || amount < 0) {
print("Invalid amount!");
} else {
expense List .add ({
"description": desc,
"amount": amount
});
print("Expense added!");
}

} else if (choice == "3") {

double total Income = 0;
double total Expenses = 0;

for (var income in income List) {
total Income += income["amount"];
}

for (var expense in expense List) {
total Expenses += expense["amount"];
}

double net = total Income - total Expenses;

print("\summary:");
print("Total income: \$${total Income}");
print("Total expenses: \$${total Expenses}");

if (net >= 0) {
print("Net profit: \$${net}");
} else {
print("Net loss: \$${net. Abs()}");
}

} else if (choice == "4") {

print("Exiting the application. Goodbye!");
break;

} else {
print("Invalid choice!");
}
}
}