import 'dart:io';

const int minTemp = 15;
const int maxTemp = 30;

void main() {
  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;

  bool running = true;
  while (running) {	
    print('Choose an option:');
    print('1. Control Lights');
    print('2. Adjust Thermostat');
    print('3. Control Security System');
    print('4. View System Status');
    print('5. Exit');

    stdout.write('Enter your choice (1-5): ');
    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        stdout.write('Turn lights ON or OFF? ');
        String? lightInput = stdin.readLineSync()?.toLowerCase();
        if (lightInput == 'on') {
          lightsOn = true;
          print('Lights turned ON.');
        } else if (lightInput == 'off') {
          lightsOn = false;
          print('Lights turned OFF.');
        } else {
          print('Invalid input. Please enter ON or OFF.');
        }
        break;

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

      case '3':
        stdout.write('Arm or Disarm security system? ');
        String? secInput = stdin.readLineSync()?.toLowerCase();
        if (secInput == 'arm') {
          securityArmed = true;
          print('Security system ARMED.');
        } else if (secInput == 'disarm') {
          securityArmed = false;
          print('Security system DISARMED.');
        } else {
          print('Invalid input. Please enter ARM or DISARM.');
        }
        break;

      case '4':
        print('\n=== Smart Home Status ===');
        print('Lights: ${lightsOn ? 'ON' : 'OFF'}');

        String tempMessage = '';
        if (thermostat % 3 == 0 && thermostat % 5 == 0) {
          tempMessage = 'Perfect Day';
        } else if (thermostat % 3 == 0) {
          tempMessage = 'Cool Day';
        } else if (thermostat % 5 == 0) {
          tempMessage = 'Warm Day';
        }
        print('Thermostat: $thermostat°C ${tempMessage.isNotEmpty ? '($tempMessage)' : ''}');
        print('Security System: ${securityArmed ? 'ARMED' : 'DISARMED'}\n');
        break;

      case '5':
        running = false;
        print('Exiting Smart Home Automation System. Goodbye!');
        break;

      default:
        print('Invalid choice. Please enter a number from 1 to 5.');
    }

    print('');
  }
}