/* See README.TXT for information about this software */

/**
   A Rain Gauge.
*/
public class RainGauge {
  private double totalRainfall; // the total amount of accumulated rainfall
  private int numberOfDays;     // the number of days that we're measuring

  /** Create a rain gauge, with no rainfall and no days recorded.
   */
  public RainGauge() {
    this.totalRainfall = 0.0;
    this.numberOfDays = 0;
  }

  /** Return the current total amount of accumulated rainfall, in inches.
      @return the total accumulated rainfall.
  */
  public double getTotalRainfall() {
    return this.totalRainfall;
  }

  /** Return the number of days that we've recorded rainfall data.
      @return the number of days recorded.
  */
  public int getNumberOfDays() {
    return this.numberOfDays;
  }

  /** Return the average amount of rainfall per day, in inches, or 0
      if we've not recorded anything yet
      @return the average rainfall per day
  */
  public double getAverageRainfall() {
    if (this.numberOfDays == 0) {
      return 0.0;
    } else {
      return this.totalRainfall / this.numberOfDays;
    }
  }

  /** Record another day's rainfall data.
      @param dailyRainfall the rainfall for this day, in inches.
  */
  public void recordDailyRainfall(double dailyRainfall) {
    this.totalRainfall = this.totalRainfall + dailyRainfall;
    this.numberOfDays = this.numberOfDays + 1;
  }

  /** Compute a string representation of the rain gauge, e.g. for
      printing out */
  public String toString() {
    return "RainGauge: " + totalRainfall + " inches of rain over the past " +
      numberOfDays + " days";
  }

  /** A method to test out the RainGauge operations */
  public static void test() {
    RainGauge gauge1 = new RainGauge();
    gauge1.recordDailyRainfall(0.5);
    gauge1.recordDailyRainfall(0.4);
    gauge1.recordDailyRainfall(1.2);
    gauge1.recordDailyRainfall(0.0);
    gauge1.recordDailyRainfall(0.2);
    System.out.println(gauge1);  // automatically calls gauge.toString()
    System.out.println("Average daily rainfall = " + 
                       gauge1.getAverageRainfall());

    RainGauge gauge2 = new RainGauge();
    System.out.println(gauge2);
    System.out.println("Average daily rainfall = " + 
                       gauge2.getAverageRainfall());
  }

}