// Budget Management Application - Dart Program
// Student: Hadeel Bin Omar
// ID: 123456789

import 'dart:io';

void main() {
  print('==============================');
  print(' Welcome to Budget Manager ');
  print('==============================');

  // 🔹 القوائم لتخزين الدخل والمصاريف
  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  while (true) {
    // 🔹 عرض القائمة للمستخدم
    print('\nPlease choose an option:');
    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 == null) continue;

    if (choice == '1') {
      // 🟩 إضافة دخل
      stdout.write('Enter income description: ');
      String? desc = stdin.readLineSync();

      stdout.write('Enter income amount: ');
      String? amtInput = stdin.readLineSync();

      double? amount = double.tryParse(amtInput ?? '');

      if (desc != null && amount != null && amount >= 0) {
        incomeList.add({desc: amount});
        print('✅ Income added successfully.');
      } else {
        print('❌ Invalid input! Please enter a valid positive number.');
      }
    } else if (choice == '2') {
      // 🟥 إضافة مصروف
      stdout.write('Enter expense description: ');
      String? desc = stdin.readLineSync();

      stdout.write('Enter expense amount: ');
      String? amtInput = stdin.readLineSync();

      double? amount = double.tryParse(amtInput ?? '');

      if (desc != null && amount != null && amount >= 0) {
        expenseList.add({desc: amount});
        print('✅ Expense added successfully.');
      } else {
        print('❌ Invalid input! Please enter a valid positive number.');
      }
    } else if (choice == '3') {
      // 📊 عرض الملخص
      double totalIncome = 0;
      double totalExpenses = 0;

      for (var item in incomeList) {
        totalIncome += item.values.first;
      }

      for (var item in expenseList) {
        totalExpenses += item.values.first;
      }

      double net = totalIncome - totalExpenses;

      print('\n========== Summary ==========');
      print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
      print('Total Expenses: \$${totalExpenses.toStringAsFixed(2)}');

      // 🔹 تحديد ربح أو خسارة
      if (net > 0) {
        print('Your net profit is \$${net.toStringAsFixed(2)}');

        // 🧮 حساب الضريبة (اختياري)
        double tax = net * 0.15;
        print('Tax to be paid (15%): \$${tax.toStringAsFixed(2)}');
      } else if (net < 0) {
        print('Your net loss is \$${net.abs().toStringAsFixed(2)}');
      } else {
        print('You broke even this month!');
      }

      print('==============================');
    } else if (choice == '4') {
      // 🚪 الخروج من البرنامج
      print('Exiting Budget Manager... Goodbye!');
      break;
    } else {
      print('❌ Invalid choice! Please select 1–4.');
    }
  }
}