import 'dart:io';

void main() {
  // --- Constants ---//
  const int minTemp = 15;
  const int maxTemp = 30;

  // --- Initial values ---//
  bool lightsOn = false;
  int thermostatTemp = 20;
  bool securityArmed = false;

  print('Welcome to the Smart Home System!');
  print('Please choose an option:');
  print('1. Toggle lights');
  print('2. Set thermostat temperature between $minTemp°C and $maxTemp°C');
  print('3. Arm/disarm security system');
  print('4. View system status');
  print('5. Exit');

  while (true) {
    int deviceCommands = int.parse(stdin.readLineSync()!);
    if (deviceCommands < 1 || deviceCommands > 5) {
      print('Invalid choice. Please enter a number between 1 and 5.');
      continue;
    }

    switch (deviceCommands) {
      case 1:
        lightsOn = !lightsOn;
        print('- Lights: ${lightsOn ? 'ON' : 'OFF'}.');
        break;

      case 2:
        while (true) {
          print('Enter desired temperature ($minTemp°C - $maxTemp°C):');
          int input = int.parse(stdin.readLineSync()!);
          if (input < minTemp || input > maxTemp) {
            print(
              'Invalid temperature. Please enter a value between $minTemp°C and $maxTemp°C.',
            );
            continue;
          }
          thermostatTemp = input;
          print('Thermostat set to $thermostatTemp°C.');
          break;
        }
        break;
      case 3:
        securityArmed = !securityArmed;
        print('- Security System: ${securityArmed ? 'ARMED' : 'DISARMED'}.');
        break;

      case 4:
        print('System Status:');
        print('Lights: ${lightsOn ? 'ON' : 'OFF'}.');

        if (thermostatTemp % 3 == 0 && thermostatTemp % 5 == 0) {
          print('$thermostatTemp - Perfect Day');
        } else if (thermostatTemp % 3 == 0) {
          print('$thermostatTemp - Cool Day');
        } else if (thermostatTemp % 5 == 0) {
          print('$thermostatTemp - Warm Day');
        }
        print('Security System: ${securityArmed ? 'ARMED' : 'DISARMED'}.');
        break;

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