import 'dart:io';

/*
  Student Name: Yasser Ali Al-Mansari
  University ID: 241001991
  Task 1: Store Sales Management System
*/

void main() {
  print("Welcome to the Store Sales Management System!");

  double pricePerItem = 15.0; 
  int itemsSold = 0;

  print("Please enter the customer's age:");
  String? ageInput = stdin.readLineSync();
  int age = int.parse(ageInput ?? '0');

  if (age >= 60) {
    print("Senior discount applied (20% off)!");
    pricePerItem *= 0.80;
  } else if (age < 12) {
    print("Child discount applied (10% off)!");
    pricePerItem *= 0.90;
  } else {
    print("Regular price applied.");
  }

  print("\n--- Recording Sales for 5 hours ---");
  for (int hour = 1; hour <= 5; hour++) {
    print("Enter items sold in hour $hour:");
    int hourlySales = int.parse(stdin.readLineSync() ?? '0');
    itemsSold += hourlySales;
  }

  double totalRevenue = itemsSold * pricePerItem;
  print("\n--- Final Report ---");
  print("Total items sold: $itemsSold");
  print("Final total revenue: \$${totalRevenue.toStringAsFixed(2)}");

  String storeStatus = (itemsSold >= 50) ? "Target Achieved" : "Target Not Met";
  print("Performance: $storeStatus");
}