/**
 * CS151 Fall 2007 Lab #3 solution.<BR>
 * Models a simple version of an automobile with fuel amount, fuel efficiency,
 * and mileage attributes.  Fuel measured in gallons and efficiency in
 * miles/gallon.
 * 
 * @author Scott Russell
 * @version 9/20/2007
 */
public class Automobile
{
    //Instance Fields/Variables
    //(Need not intialize since will do it in constructors)
    
    //amount of fuel in the vehicle in gallons
    private double fuelLevel;
    
    //amount of distance the car can travel per gallon of fuel
    private double fuelEfficiency;
    
    //total distance in miles the car has traveled
    private double mileage;
    
    //Constructors
    /**
     * Creates a new automobile with the specified efficiency.  Fuel level and 
     * mileage are initialize to 0.
     * @param efficiency number of miles/gallon of fuel the car can travel.
     */
    public Automobile(double efficiency)
    {
        //initialize the efficiency to specified value
        fuelEfficiency = efficiency;
        
        //initialize fuel level to 0
        fuelLevel = 0;

        //initialize mileage to 0
        mileage = 0;
    }
    
    /**
     * Creates a new automobile with the specified efficiency and fuel level.
     * Mileage is initialized to 0.
     * @param efficiency number of miles/gallon of fuel the car can travel.
     * @param fuelAmount amount of fuel in gallons.
     */
    public Automobile(double efficiency, double fuelAmount)
    {
        //initialize the efficiency to specified value
        fuelEfficiency = efficiency;
        
        //initialize fuel level to specified value
        fuelLevel = fuelAmount;

        //initialize mileage to 0
        mileage = 0;
    }   
    /**
     * Creates a new automobile with the specified efficiency, fuel level, and mileage.
     * @param efficiency number of miles/gallon of fuel the car can travel.
     * @param fuelAmount amount of fuel in gallons.
     * @param miles initial mileage reading in miles.
     */
    public Automobile(double efficiency, double fuelAmount, double miles)
    {
        //initialize the efficiency to specified value
        fuelEfficiency = efficiency;
        
        //initialize fuel level to specified value
        fuelLevel = fuelAmount;

        //initialize mileage to specified value
        mileage = miles;
    }

    //Methods
    /**
     * Add the specified amount of fuel to the auto's fuel level.
     * @param fuelAmount number of gallons of fuel to add.
     */
    public void addFuel(double fuelAmount)
    {
        fuelLevel = fuelLevel + fuelAmount;   
    }
    
    /**
     * Simulate driving the auto the specified number of miles.
     * @param distance number of miles to drive.
     */
    public void drive(double distance)
    {
        fuelLevel = fuelLevel - distance/fuelEfficiency;
        mileage = mileage + distance;
    }
    
    //get and set Methods
    /**
     * Sets the fuel amount to the specified value.
     * @param fuelAmount amount of fuel in gallons.
     */
    public void setFuelLevel(double fuelAmount)
    {
        fuelLevel = fuelAmount;
    }

    /**
     * Gets the current fuel level.
     * @return current fuel level in gallons.
     */
    public double getFuelLevel()
    {
        return fuelLevel;
    }

    /**
     * Sets the fuel efficiency to the specified value.
     * @param efficiency fuel efficiency in miles/gallon.
     */
    public void setFuelEfficiency(double efficiency)
    {
        fuelEfficiency = efficiency;
    }

    /**
     * Gets the current fuel efficiency.
     * @return current fuel efficiency in miles/gallons.
     */
    public double getFuelEfficiency()
    {
        return fuelEfficiency;
    }

    /**
     * Sets the mileage to the specified value.
     * @param miles mileage value.
     */
    public void setMileage(double miles)
    {
        mileage = miles;
    }

    /**
     * Gets the current fuel efficiency.
     * @return current fuel efficiency in miles/gallons.
     */
    public double getMileage()
    {
        return mileage;
    }


}