/*
 * TemperatureAdvisor.java
 * 
 * Project 1 Part A sample solution
 */

/* import the Random class so we can use it in our program. */
import java.util.Random;

/**
 * A class for converting temperature values between Fahrenheit, Celsius,
 * and Kelvin degree scales.  Stores the last temperature value given as the
 * current temperature, and makes preductions about what tomorrow's temperature
 * will be.
 * 
 * @author Orion Bawdon
 */
public class TemperatureAdvisor {
  /** The current temperature, in degrees Celsius. */
  private double currentTemp;
  /** A random number generator used for weather forecasting. */
  private Random rand;
  
  /**
   * Creates a new TemperatureAdvisor.  The current temperature is set to a
   * reasonable default value and a random number generator object is created.
   */
  public TemperatureAdvisor() {
    currentTemp = 15.0;
    rand = new Random();
  }
  
  /*
   * Each of the convert methods does two things:
   * 1. Sets the current temperature to a certain value.  Remember, we are
   * storing the temperature in Celsius, so that means that to do this we must
   * always convert the temperature to Celsius, no matter what scales we are
   * converting to and from.
   * 2. Returns the temperature in the desired scale.  To do this we take
   * advantage of the fact that we are making other methods to return the
   * current temperature in each of the three temperature scales.  Writing your
   * program this way reduces the amount of coding you need to do and also makes
   * it easier to debug if something goes wrong.
   * 
   * Each method also is preceded by a Javadoc comment.  The purpose of these
   * comments is to communicate, on a high level, what each method does.  Many
   * of these comments are very similar, but it is still considered good
   * programming practice to have a comment before each method specifying
   * exactly what the method does.  Don't worry too much about the format of
   * these comments for now, but you should make it a point to include them
   * on every method you implement, if you haven't been doing so already.
   */
  

  /**
   * Converts a temperature from degrees Fahrenheit to degrees Celsius and
   * sets the current temperature to that value.
   * 
   * @param degreesF The temperature to be converted, in degrees Fahrenheit.
   * @return the given temperature in degrees Celsius.
   */
  public double convertFToC(double degreesF) {
    currentTemp = (5.0 / 9.0) * (degreesF - 32.0);
    return getCurrentTempC();
  }
  
  /**
   * Converts a temperature from degrees Celsius to degrees Fahrenheit and
   * sets the current temperature to that value.
   * 
   * @param degreesC The temperature to be converted, in degrees Celsius.
   * @return the given temperature in degrees Fahrenheit.
   */
  public double convertCToF(double degreesC) {
    currentTemp = degreesC;
    return getCurrentTempF();
  }
  
  /**
   * Converts a temperature from degrees Fahrenheit to degrees Kelvin and
   * sets the current temperature to that value.
   * 
   * @param degreesF The temperature to be converted, in degrees Fahrenheit.
   * @return the given temperature in degrees Kelvin.
   */
  public double convertFToK(double degreesF) {
    currentTemp = (5.0 / 9.0) * (degreesF - 32.0);
    return getCurrentTempK();
  }
  
  /**
   * Converts a temperature from degrees Kelvin to degrees Fahrenheit and
   * sets the current temperature to that value.
   * 
   * @param degreesF The temperature to be converted, in degrees Kelvin.
   * @return the given temperature in degrees Fahrenheit.
   */
  public double convertKToF(double degreesK) {
    currentTemp = degreesK - 273.15;
    return getCurrentTempF();
  }
   
  /**
   * Converts a temperature from degrees Celsius to degrees Kelvin and
   * sets the current temperature to that value.
   * 
   * @param degreesF The temperature to be converted, in degrees Celsius.
   * @return the given temperature in degrees Kelvin.
   */
  public double convertCToK(double degreesC) {
    currentTemp = degreesC;
    return getCurrentTempK();
  }
  
  /**
   * Converts a temperature from degrees Kelvin to degrees Celsius and
   * sets the current temperature to that value.
   * 
   * @param degreesF The temperature to be converted, in degrees Kelvin.
   * @return the given temperature in degrees Celsius.
   */
  public double convertKToC(double degreesK) {
    currentTemp = degreesK - 273.15;
    return getCurrentTempC();
  }
  
  /**
   * Gets the current temperature in degrees Fahrenheit.
   * 
   * @return the current temperature in degrees Fahrenheit.
   */
  public double getCurrentTempF() {
    return currentTemp * (9.0 / 5.0) + 32.0;
  }
  
  /**
   * Gets the current temperature in degrees Celsius.
   * 
   * @return the current temperature in degrees Celsius.
   */
  public double getCurrentTempC() {
    return currentTemp;
  }
  
  /**
   * Gets the current temperature in degrees Kelvin.
   * 
   * @return the current temperature in degrees Kelvin.
   */
  public double getCurrentTempK() {
    return currentTemp + 273.15;
  }
  
  /**
   * Predicts tomorrow's temperature by randomly generating a value within
   * 5 degrees C of the current temperature.
   * 
   * @return tomorrow's temperature in degrees Fahrenheit.
   */
  public double getTomorrowsTempF() {
    double tomorrowsTemp = currentTemp + (rand.nextDouble() * 10.0) - 5.0;
    return tomorrowsTemp * (9.0 / 5.0) + 32.0;
  }
  
  /**
   * Predicts tomorrow's temperature by randomly generating a value within
   * 5 degrees C of the current temperature.
   * 
   * @return tomorrow's temperature in degrees Celsius.
   */
  public double getTomorrowsTempC() {
    double tomorrowsTemp = currentTemp + (rand.nextDouble() * 10.0) - 5.0;
    return tomorrowsTemp;
  }
  
  /**
   * Predicts tomorrow's temperature by randomly generating a value within
   * 5 degrees C of the current temperature.
   * 
   * @return tomorrow's temperature in degrees Kelvin.
   */
  public double getTomorrowsTempK() {
    double tomorrowsTemp = currentTemp + (rand.nextDouble() * 10.0) - 5.0;
    return tomorrowsTemp + 273.15;
  }
}