import 'dart:io';

void main() {
  print('welcome to the smart home!');
  const int minTemp = 15;
  const int maxTemp = 30;

  bool lightsOn = false;
  double thermostatTemp = 20.0;
  bool securityArmed = false;

  bool running = true;
  while (running) {
    print("\n---------------------");
    print("please choose an action:");
    print("1.toggle lights");
    print("2.set thermostat temperature");
    print("3.Arm/disarm security system");
    print("4.View system status");
    print("5.Exit");
    stdout.write("Enter your choice:");
    String? input = stdin.readLineSync();
    int? choice = int.tryParse(input ?? "");

    if (choice == null || choice < 1 || choice > 5) {
      print("invalid choice please enter a number between 1 and 5 ");
      continue;
    }
    switch (choice) {
      case 1:
        lightsOn = !lightsOn;
        String status = lightsOn ? "ON " : "OFF";
        print("Lights are now $status");
        break;
      case 2:
        stdout.write("set thermostat temperture ($minTemp-$maxTemp):");
        String? tempInput = stdin.readLineSync();
        double? newTemp = double.tryParse(tempInput ?? "");

        if (newTemp == null || newTemp < minTemp || newTemp > maxTemp) {
          print("invalid temperture must be between $minTemp and $maxTemp");
          break;
        }
        thermostatTemp = newTemp;
        print("thermostatTemp set to ${thermostatTemp.toStringAsFixed(1)}");
        break;
      case 3:
        securityArmed = !securityArmed;
        String secStatus = securityArmed ? "ARMED" : "DISARMED";
        print("security System is now $secStatus");
        break;
      case 4:
        print("\n--- System status---");
        print("Lights:${lightsOn ? "ON" : "OFF"}");
        String SecurityDisplay = (securityArmed ? "armed" : "disarmed")
            .toUpperCase();
        print("security System:$SecurityDisplay");

        String tempMessage = "";
        bool isMultipleOf3 = thermostatTemp % 3 == 0;
        bool isMultipleOf5 = thermostatTemp % 5 == 0;

        if (isMultipleOf3 && isMultipleOf5) {
          tempMessage = "Perfect Day";
        } else if (isMultipleOf3) {
          tempMessage = "Cool Day";
        } else if (isMultipleOf5) {
          tempMessage = "warm Day";
        }
        print("Thermostat:${thermostatTemp.toStringAsFixed(1)}${tempMessage}");
        break;
      case 5:
        running = false;
        print("Exiting the system goodbye!");
        break;
    }
  }
}

import 'dart:io';

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

void main() {
  bool keepAppRunning = true;

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

  while (keepAppRunning) {
    displayMenu();

    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        // Call function to add income
        addEntry('income', incomeList);
        break;
      case '2':
        // Call function to add expense
        addEntry('expense', expenseList);
        break;
      case '3':
        viewSummary();
        break;
      case '4':
        keepAppRunning = false;
        print('Exiting the application. Goodbye!');
        break;
      default:
        print('Invalid choice. Please enter a number from 1 to 4.');
    }
    print('\n----------------------------------------\n');
  }
}

void displayMenu() {
  print('Please choose an action:');
  print('1. Add income');
  print('2. Add expense');
  print('3. View summary');
  print('4. Exit program');
  stdout.write('Enter your choice (1-4): ');
}

void addEntry(String type, List<Map<String, dynamic>> list) {
  // 1. Get description
  stdout.write('Enter $type description: ');
  String? description = stdin.readLineSync();

  if (description == null || description.isEmpty) {
    description = 'No Description';
  }

  double? amount;
  bool isValid = false;

  while (!isValid) {
    stdout.write('Enter $type amount (must be a non-negative number): ');
    String? input = stdin.readLineSync();

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

    if (amount != null && amount >= 0) {
      isValid = true;
    } else {
      print('Error: Invalid amount. Please enter a valid non-negative number.');
    }
  }

  list.add({'description': description, 'amount': amount!});

  print('\n${type.toUpperCase()} added successfully!');
}

void viewSummary() {
  print('---------------BUDGET SUMMARY ---------------');

  double totalIncome = incomeList.fold(
    0.0,
    (sum, item) => sum + (item['amount'] as double),
  );
  double totalExpenses = expenseList.fold(
    0.0,
    (sum, item) => sum + (item['amount'] as double),
  );

  double netProfit = totalIncome - totalExpenses;

  print('Totals:');
  print('  * Total Income: \$${totalIncome.toStringAsFixed(2)}');
  print('  * Total Expenses: \$${totalExpenses.toStringAsFixed(2)}');
  print('');

  if (netProfit >= 0) {
    print(' Net Profit: \$${netProfit.toStringAsFixed(2)}');

    double taxRate = 0.15;

    double taxAmount = netProfit > 0 ? netProfit * taxRate : 0.0;

    if (taxAmount > 0) {
      print('Tax Due (15% of profit): \$${taxAmount.toStringAsFixed(2)}');
    }
  } else {
    print('Net Loss: \$${netProfit.abs().toStringAsFixed(2)}');
  }
}