// =======================================
// Smart Home Automation System
// Developer: Ahmed Alawazim
// Student ID: 2021204738
// =======================================

import 'dart:io';

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

  // =======================
  // Default Device States
  // =======================
  bool lightsOn = false;
  int thermostat = 20;
  bool securityArmed = false;

  // =======================
  // Main Loop
  // =======================
  while (true) {
    print('\n=======================================');
    print('   Welcome to the Smart Home System!   ');
    print('   Developer: Ahmed Alawazim');
    print('   Student ID: 2021204738');
    print('=======================================');
    print('Please choose an action:');
    print('1. Toggle lights');
    print('2. Set thermostat temperature');
    print('3. Arm/disarm security system');
    print('4. View system status');
    print('5. Exit');
    stdout.write('\nEnter your choice: ');
    String? choice = stdin.readLineSync();

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

      case '2':
        stdout.write('Enter temperature ($minTemp°C - $maxTemp°C): ');
        String? input = stdin.readLineSync();
        int? newTemp = int.tryParse(input ?? '');

        if (newTemp == null) {
          print('Invalid input. Please enter a number.');
        } else if (newTemp < minTemp || newTemp > maxTemp) {
          print('Temperature must be between $minTemp°C and $maxTemp°C.');
        } else {
          thermostat = newTemp;
          print('Thermostat set to $thermostat°C.');

          // FizzBuzz-like feature
          if (thermostat % 3 == 0 && thermostat % 5 == 0) {
            print('Perfect Day!');
          } else if (thermostat % 3 == 0) {
            print('Cool Day!');
          } else if (thermostat % 5 == 0) {
            print('Warm Day!');
          }
        }
        break;

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

      case '4':
        print('\n=== System Status ===');
        print('Lights: ${lightsOn ? "ON" : "OFF"}');
        print('Thermostat: $thermostat°C');
        print('Security: ${securityArmed ? "ARMED" : "DISARMED"}');
        break;

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

      default:
        print('Invalid choice. Please try again.');
    }
  }
}