package class7_3_Yogurt; // MSOE. Dr. Yoder. 13 October 2015.

public class Incubator {
    // 100 million cultures per gram (NYA - Nat. Yogurt Assoc.)
    // 200 g/cup (random web search)
    // 200 g/cup * 100 million cult./gram = 20 billion cultures / 1 cup

    private final long BACTERIA_PER_CUP_STARTER = 20_000_000_000L;
    public final double GROWTH_RATE_PER_HOUR = 0.05;
    private long numBacteria;

    /**
     * Add starter to the culture.
     * Adds the number of bacterium in the given volume of starter
     * @param starterCups amount of starter, in cups, to add.
     */
    public void addStarterCups(double starterCups) {
        // Point B
        long newBacteria = (long)(starterCups * BACTERIA_PER_CUP_STARTER);
        // Point C
        numBacteria += newBacteria;
        // Point D
    }

    /**
     * @return the integer number of bacteria cells in the incubator
     */
    public long getNumBacteria() {
        // Point F
        return numBacteria;
    }

    /**
     * Simulate one hour of incubation.
     * Increase the number of bacterium in the culture by the growth rate.
     * (Relative to the original number of bacteria)
     */
    public void incubateOneHour() {
        numBacteria = numBacteria + (long)(numBacteria * GROWTH_RATE_PER_HOUR);
    }

    /**
     * Exercise: What is the state of the program at HERE 2?
     * @param other a mystery...
     */
    public void mystery(Incubator other) {
        long total;
        // HERE 1
        total = this.numBacteria + other.numBacteria;
        this.numBacteria = total/2;
        other.numBacteria = total/2;
        // HERE 2
    }

}