import 'dart:io';

void main() {
  print("===== Smart Home Control Panel =====");
  bool lights = false;
  bool security = false;
  int temperature = 22;

  while (true) {
    print("\n========= MENU =========");
    print("1. Turn Lights ON/OFF");
    print("2. Adjust Thermostat");
    print("3. Arm or Disarm Security");
    print("4. Show System Status");
    print("5. Exit System");
    stdout.write("Enter your choice (1-5): ");
    String? input = stdin.readLineSync();

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

      case '2':
        stdout.write("Set temperature (15°C - 30°C): ");
        int? newTemp = int.tryParse(stdin.readLineSync() ?? '');
        if (newTemp != null && newTemp >= 15 && newTemp <= 30) {
          temperature = newTemp;
          print("🌡️ Thermostat set to $temperature°C");
        } else {
          print("⚠️ Invalid temperature! Please choose between 15 and 30.");
        }
        break;

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

      case '4':
        print("\n📊 Current System Status:");
        print("- Lights: ${lights ? 'ON' : 'OFF'}");
        print("- Thermostat: $temperature°C");

        if (temperature % 3 == 0 && temperature % 5 == 0) {
          print("✨ Perfect Day");
        } else if (temperature % 3 == 0) {
          print("❄️ Cool Day");
        } else if (temperature % 5 == 0) {
          print("🔥 Warm Day");
        }

        print("- Security: ${security ? 'ARMED' : 'DISARMED'}");
        break;

      case '5':
        print("👋 Exiting Smart Home System...");
        return;

      default:
        print("❌ Invalid choice! Please enter a number between 1 and 5.");
    }
  }
}