/* -------------------------------------------------------- *
 * Aaron Morris                                             *
 * CS567                                                    *
 * Object-Oriented Event-Driven Simulation                  *
 *                                                          *
 * Generic Stats class, tracking statistics based on        *
 * instances, not time.                                     *
 * -------------------------------------------------------- */
//package datasend;
import java.awt.*;

public class Counter {

        //Members
        protected double last;         // Last value updated with
	protected double sum;          // Sum of all values updated with
	protected double sumsquared;   // Sum of the squares of all values
	protected double max;          // Max value updated with to date
	protected double min;          // Min value updated with to date
	protected double n;            // Number of values updated with
	protected String title;        // Title of this report

        // Constructor -- Initialize Title and all members to 0
	public Counter(String Title)
	{
		this.title = Title;
                n = 0;
		last = 0;
		sum = 0;
		sumsquared = 0;
		min = 0;
		max = 0;
	}

        // Method to return number of samples recorded
        public double getNumSamples() { return n; }

        // Method to update the counter with the value at Time
	public void update(double Value)
	{
                // If no samples yet, min and max are the first value
		if (n == 0)
		{
			min = Value;
			max = Value;
		}
		else if (Value < min)	{ min = Value; }  // New min value
		else if (Value > max)	{ max = Value; }  // New max value

                sum += Value;               // Sum of all values updated with
		last = Value;               // Set for next time update
		sumsquared += Value*Value;  // Sum of all values squared
		n++;                        // Increment number of samples
	}


        // Print out results that have been recorded to output object
	public void doReport(Report r)
	{
		double variance,ex2,mean;

                r.write(title);
		if (n==0) 
		{
			r.write("    n was 0, no data to report");
			r.write(" ");
		}
            else
                {
                    mean = sum/n;
                    r.write("    sampled " + n + " values");
                    r.write("    values ranged from " + min + " to " + max);
                    r.write("    mean is " + mean);
                    ex2 = sumsquared / n;
                    variance = ex2 - mean*mean;
                    r.write("    variance is " + variance);
                    r.write(" ");
                }
	}
}