// Smart Home Automation System - Assignment 1
import 'dart:io';

void main() {
  const double minTemp = 15.0;
  const double maxTemp = 30.0;

  bool isLightsOn = false;
  double thermostatTemp = 20.0;
  bool isSecurityArmed = false;

  print("Welcome to the Smart Home System!");

  while (true) {
    print("\nPlease 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? choice = stdin.readLineSync();

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

      case '2':
        stdout.write("Set thermostat temperature ($minTemp - $maxTemp): ");
        double? inputTemp = double.tryParse(stdin.readLineSync() ?? "");
        if (inputTemp != null && inputTemp >= minTemp && inputTemp <= maxTemp) {
          thermostatTemp = inputTemp;
          print("Thermostat set to $thermostatTemp°C.");
        } else {
          print("Invalid temperature! Please stay between $minTemp and $maxTemp.");
        }
        break;

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

      case '4':
        String tempMsg = "";
        if (thermostatTemp % 3 == 0 && thermostatTemp % 5 == 0) tempMsg = "Perfect Day";
        else if (thermostatTemp % 3 == 0) tempMsg = "Cool Day";
        else if (thermostatTemp % 5 == 0) tempMsg = "Warm Day";

        print("\nSystem Status:");
        print("Lights: ${isLightsOn ? 'ON' : 'OFF'}");
        print("Thermostat: ${thermostatTemp}°C $tempMsg");
        print("Security System: ${isSecurityArmed ? 'ARMED' : 'DISARMED'}");
        break;

      case '5':
        print("Exiting the system. Goodbye!");
        return;

      default:
        print("Invalid choice.");
    }
  }
}