/**
 * Read date from a text file and does magic(math) with it.
 *
 * @author Bruno Alves
 * @version 8/18/2014
 */
import java.util.Scanner;
import java.io.File;
import java.io.IOException;

public class Weight
{
    // Note: formula for finding weight on a planet:  Earth weight divided by Gravity constant times surface gravity
    public static double[] getGravity()throws IOException
    {
        File gravityFile = new File("GravityV1.txt");

        Scanner file = new Scanner(gravityFile);

        double[] gravity = new double[9];


            for(int i = 0; file.hasNextDouble();i++)
            {
                gravity[i] = file.nextDouble() / 10;
            }


        file.close();

        return gravity;
    }


    public static double[] calcWeight(double earthWeight, double[] gravity)
    {
        double[] weight = new double[gravity.length];

            for (int i = 0; i < weight.length; i++)
            {
                weight[i] = (earthWeight * 433.59237)  / gravity[i];
                weight[i] = weight[i] * 453.592;

            }

        return weight;
    }



    public static void printResults(String[] names, double[] gravity, double[] weight)
    {
        System.out.printf("     My Weight On The Planets%n");

        System.out.printf("Planet    Gravity     Weight(lbs)%n");
        System.out.printf("*************************************%n");
            for(int i = 0; i < gravity.length; i++)
            {
                System.out.printf("%-10s %-12.2f %-12.2f %n", names[i], gravity[i], weight[i]);

            }
    }


    public static void main(String[] args)throws IOException
    {
        Scanner kb = new Scanner(System.in);
        double earthWeight;
        System.out.print("Whats your weight on Earth: ");
        earthWeight = kb.nextDouble();




        String[] names = {"Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto"};
        double[] gravity = getGravity();                            // static method you write
        double[] weight = calcWeight(earthWeight, gravity);  // static method you write

        printResults(names, gravity, weight);                   // static method you write

        kb.close(); //Close scanner.

    } //end main
}//end class