import 'dart:io';

/*
  Task 2: Electricity Usage Monitoring System
  This program monitors hourly electricity usage and provides 
  alerts and bill discounts based on consumption.
*/

void main() {
  // 1. Set Electricity Usage Limit (in kWh)
  double usageLimit = 150.0;
  double currentTotalUsage = 0.0;

  print("--- Smart Home: Electricity Monitor ---");

  // 2. Track Usage for 24 Hours using for loop
  for (int hour = 1; hour <= 24; hour++) {
    // Simulating random usage for each hour (e.g., between 1 to 10 kWh)
    double hourlyUsage = 6.5; // Example constant usage for simulation
    currentTotalUsage += hourlyUsage;

    // 3. String Concatenation & 4. Upper/Lowercase Alert
    if (currentTotalUsage > usageLimit) {
      String alertMessage = "warning: usage limit exceeded!";
      print("Hour $hour: " + alertMessage.toUpperCase());
    } else {
      print("Hour $hour: Usage is within safe limits.");
    }
  }

  // 5. Final Calculations
  print("\nTotal usage for the day: $currentTotalUsage kWh");

  // 6. Discount for Conserving Energy
  if (currentTotalUsage < 100) {
    print("Congratulations! You used less than 100 kWh.");
    print("A 10% discount will be applied to your next bill.");
  } else {
    print("No conservation discount applied this time.");
  }
}