import 'dart:io';

void main() {
  const int Max_Temp = 30;
  const int Min_Temp = 15;
  bool lights_on = false;
  bool security_armed = false;
  int thermostat = 20;

  print("Welcome to the smart home system!\n");

  bool task = true;
  while (task) {
    print("Please choose an action:");
    print("1. Toggle lights");
    print("2. Set thermostat temperure");
    print("3. Arm/Disarm security systwm");
    print("4. View system status");
    print("5. Exit\n");

    print("Enter your choice:");
    String? input = stdin.readLineSync();
    int? choice = int.tryParse(input ?? '');

    if (choice == null) {
      print("invalid input .\nplease rnter a number 1 - 5 .\n");
      continue;
    }

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

      case 2: //ok
        print("Set thermostat temperture ($Min_Temp c - $Max_Temp c):");
        String? temp_input = stdin.readLineSync();
        int? new_temp = int.tryParse(temp_input ?? '');

        if (new_temp == null || new_temp < Min_Temp || new_temp > Max_Temp) {
          print("invalid !!. please enter between $Min_Temp and $Max_Temp.\n");
        } else {
          thermostat = new_temp;
        }
        print("Thermostat set to $thermostat c .\n");
        break;

      case 3: //ok
        security_armed = !security_armed;
        print(
          "Security System: ${security_armed ? '(ARMED)' : '(DISARMED)'}.\n",
        );
        break;

      case 4:
        print("System status:");
        print("- Lights:${lights_on ? '(ON)' : '(OFF)'}");
        String weather = "";
        if (thermostat % 3 == 0 && thermostat % 5 == 0) {
          weather = "perfect day";
        } else if (thermostat % 3 == 0) {
          weather = "cool day";
        } else if (thermostat % 5 == 0) {
          weather = "warm day";
        }
        print("- thermostat: $thermostat  c $weather");
        print(
          "- Security System: ${security_armed ? '(ARMED)' : '(DISARMED)'}.\n",
        );
        break;

      case 5: //ok
        print("Eixting the system . Goodbye!");
        task = false;
        break;

      default: //ok
        print("Please enter a valid option (1-5).");
    }
  }
}