import 'dart:io';

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

bool lightOn = false;
int thermostat = 20;
bool securityArmed = false;

print("Welcome to the Smart Home System!");

while (true) {
print("\nPlease 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("Enter your choice: ");
String? choice = stdin.readLineSync();

if (choice == "5") {
print("Exiting the system. Goodbye!");
break;
}

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

case "2":
stdout.write("Set thermostat temperature ($minTemp-$maxTemp C): ");
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 enter a value between $minTemp and $maxTemp.");
}
break;

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

case "4":
print("\nSystem Status:");
print("Lights: ${lightOn ? "ON" : "OFF"}");

String dayMessage = "";
if (thermostat % 3 == 0 && thermostat % 5 == 0) {
dayMessage = "- Perfect Day";
} else if (thermostat % 3 == 0) {
dayMessage = "- Cool Day";
} else if (thermostat % 5 == 0) {
dayMessage = "- Warm Day";
}

print("Thermostat: $thermostat C $dayMessage");

String securityStatus =
securityArmed ? "ARMED" : "DISARMED";
print("Security System: $securityStatus");
break;

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