import 'dart:io';

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

  // Devices initial value
  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;

  while (true) {
    print("\n=== SMART HOME CONTROL PANEL ===");
    print("1. Turn Lights On/Off");
    print("2. Set Thermostat Temperature ($minTemp°C - $maxTemp°C)");
    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":
        lightsOn = !lightsOn;
        print("Lights are now: ${lightsOn ? "ON" : "OFF"}");
        break;

      case "2":
        stdout.write("Enter temperature ($minTemp-$maxTemp): ");
        int? temp = int.tryParse(stdin.readLineSync()!);

        if (temp != null && temp >= minTemp && temp <= maxTemp) {
          thermostat = temp;
          print("Thermostat set to $thermostat°C");
        } else {
          print("Invalid temperature! Please try again.");
        }
        break;

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

      case "4":
        // Day type
        String weatherMsg = "";
        if (thermostat % 3 == 0 && thermostat % 5 == 0) {
          weatherMsg = "Perfect Day";
        } else if (thermostat % 3 == 0) {
          weatherMsg = "Cool Day";
        } else if (thermostat % 5 == 0) {
          weatherMsg = "Warm Day";
        }

        print("\n=== SYSTEM STATUS ===");
        print("Lights: ${lightsOn ? "ON" : "OFF"}");
        print("Thermostat: $thermostat°C ${weatherMsg.isNotEmpty ? "($weatherMsg)" : ""}");
        print("Security: ${securityArmed ? "ARMED".toUpperCase() : "disarmed"}");
        break;

      case "5":
        print("See you later!");
        return;

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