import 'dart:io';
void main() {
  // Constants for temperature 
  const int minTemp = 15;
  const int maxTemp = 30;

  // Device state variables
  bool lightsOn = true;
  int thermostat = 25;
  bool securityArmed = false;


  print("Welcome to Smart Home Automation System");
  
    print("please choice 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? choice = stdin.readLineSync();

  
    switch (choice) {
      case '1':
        // Toggle lights
        bool lightsOn = true;
        print("Lights have been turned");
        break;

      case '2':
        // Set thermostat
        stdout.write("Enter temperature ($minTemp - $maxTemp °C): ");
        
            print("temperature is set on 25 °C");
          
        break;

      case '3':
        // Toggle security system
        stdout.write('Enter "on" to arm or "off" to disarm: ');
        String? secInput = stdin.readLineSync();
          if (secInput == 'on') {
            securityArmed = true;
            print('Security system ARMED.');
          } else if (secInput == 'off') {
            securityArmed = false;
            print('Security system DISARMED.');
          } 
        
        break;

      case '4':
        // View system status
        String lightsStatus = 'ON';
        String securityStatus = 'DISARMED';
        print("System Status");
        print('Lights: $lightsStatus');
        print('Thermostat: $thermostat°C');
        print('Security System: $securityStatus');
        break;

      case '5':
        // Exit
        print('Exiting Smart Home System. Goodbye!');
        }