import 'dart:io';
void main(){
  print('Welcome to the Smart Home System!');

  bool lights = false;
  int thermostat = 20;
  bool securitySystem = false;

  bool systemOn= true;
  
  
  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");
  
 while (systemOn) {
  stdout.write("\nEnter your choice: ");
  String? choice = stdin.readLineSync();


  switch (choice) {
    case "1":
    lights = !lights;
    print("Lights are now ${lights ? 'ON' : 'OFF'}.");
    break;
 



    case "2":
    stdout.write("Set thermostat temperature (15°C - 30°C):");
    String? inputTemp = stdin.readLineSync();
    int? temp = int.tryParse(inputTemp ?? "");

    if (temp != null && temp >= 15 && temp <=30){
      thermostat = temp;
      print("Thermostat set to $thermostat°C.");
    }else {
      print("Invalid temperature! Please enter a value between 15 and 30.");
    }
    break;



    case "3":
    securitySystem = !securitySystem;
    print("Security System is now ${securitySystem ? 'ARMED' : 'DISARMED'}");
    break;




    case "4":
    print("System Status:");

    print("Lights : ${lights ? 'ON' : 'OFF'}"); 


    String tempStatus = "";
    if (thermostat % 3 == 0 ) { 
      tempStatus = "Cool Day";
    }else if (thermostat % 5 == 0 ) {
      tempStatus = "Warm Day";
    }else if (thermostat % 3 == 0 && thermostat % 5 == 0){
      tempStatus = "Perfect Day";
    }
    print("Thermostat : $thermostat°C - ${tempStatus}");
    
    
    print("Security System : ${securitySystem ? 'ARMED' : 'DISARMED'}");
    break;
 



    case "5":
    print("Exiting the system. Goodbye!");
    systemOn = false;
    break;



    default :
    print ("Invalid choice, please try again.");
    } 
  } 
}