import java.util.Scanner;
//allows for user implementation of data



public class HalfLifeProgram {
	//constructor
	public double InitialAmount;
	public double TimeElapsed;
	public double HalfLife;
	public double FinalAmount;
	public double exponentFraction;
	public double exponent;



	public double HalfLifeCalculator (double A, double t, double k){
		InitialAmount = A;
		TimeElapsed = t;
		HalfLife = k;
		exponentFraction = t/k;
		exponent = Math.pow(0.5, exponentFraction);

		FinalAmount = A*exponent;

		return FinalAmount;
		//this method runs the half life formula of P = A(.5)^(t/k)

	}
	public double truncate(double a, int b){

		double shortener = Math.pow(10, b);
		return Math.floor(shortener*a) / shortener;

		//this method truncates the long decimals of the end results
		//however after realizing how short/long some half lives are
		//I realized that the  deeper decimal places are necessary
		//and thus, this method essentially does nothing for the
		//application
	}

}

public class Tester {

	public static void main(String[] args) {
	@SuppressWarnings("resource")
	//I'm not sure what this does but
	//Eclipse said to put this in
	Scanner input = new Scanner(System.in);

	HalfLifeProgram calculator = new HalfLifeProgram();
	double HalfLife;
	double InitialAmount;
	double TimeElapsed;
	double FinalAmount;
	double AmountDecayed;

	System.out.println("This program will calculate the the amount of");
	System.out.println("radioactive decay that occurs over an inputed amount of time");
	System.out.println();

	System.out.println("Please enter the name of your element");
	//asks for name of element then runs name through database
	//if name matches an element in the database, half life will be given
	//if not, user will be asked to input the half life manually
	String name;

	name = input.next();
	String newName;
	newName = name;
	//I know that many if-else statements is not the best
	//nor most efficient way to code this. I have yet to fully
	//understand how to implement the same system with the
	//usage of arrays but will be working on that in a future
	//version of this program.
	if(newName.equals("Technetium")){
		HalfLife = 1536650000;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Promethium")){
		HalfLife = 6351;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Polonium")){
		HalfLife = 37230;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}
	else if(newName.equals("Astatine")){
		HalfLife = .3375;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Radon")){
		HalfLife = 3.82;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Francium")){
		HalfLife = .0152777;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Radium")){
		HalfLife = 584000;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Actinium")){
		HalfLife = 7946.05;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Thorium")){
		HalfLife = 27521000;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Protactinium")){
		HalfLife = 11972000;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Uranium")){
		HalfLife = 8.541 * Math.pow(10, 6);
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Neptunium")){
		HalfLife = 781100000;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Plutonium")){
		HalfLife = 2.92 * Math.pow(10, 8);;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Americium")){
		HalfLife = 2690050 * Math.pow(10, 6);;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Curium")){
		HalfLife = 5.694 * Math.pow(10, 9);;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Berkelium")){
		HalfLife = 503700;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Californium")){
		HalfLife = 327770;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Einsteinium")){
		HalfLife = 471.7;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Fermium")){
		HalfLife = 100.5;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Mendelevium")){
		HalfLife = 51.5;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Nobelium")){
		HalfLife = .0402777777;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Lawrencium")){
		HalfLife = .166666666666;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Rutherfordium")){
		HalfLife = .5416666666666;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Dubnium")){
		HalfLife = 1.33333333333;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Seaborgium")){
		HalfLife = .001666666666;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Bohrium")){
		HalfLife = .000196759;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Hassium")){
		HalfLife = .000112268518;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Meitnerium")){
		HalfLife = .00000833333;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Darmstadtium")){
		HalfLife = .00012847222222;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Roentgenium")){
		HalfLife = .0003009259;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Copernicium")){
		HalfLife = .00033564074;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Ununtrium")){
		HalfLife = .00000555555555555;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Flerovium")){
		HalfLife = .00003067129;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Ununpentium")){
		HalfLife = .00001006944;
		System.out.println("The half-life of " + newName + " is " + HalfLife);
	}else if(newName.equals("Livermorium")){
		HalfLife = .00000706018578;
			System.out.println("The half-life of " + newName + " is " + HalfLife);

	}else if(newName.equals("Ununoctium")){
		HalfLife = .00000020833333;

	}else{
	System.out.println("Element not found. Please enter the half-life of the element in days");
	//element is not in list of elements with already-known half lives
	HalfLife = input.nextDouble();
	HalfLife = (HalfLife * 100)/100;
	}

	System.out.println("Please enter the starting amount of the element in grams");
	//asks for the amount of element that the user begins with
	InitialAmount = input.nextDouble();
	InitialAmount = (InitialAmount*100)/100;


	System.out.println("Please enter the amount of time the element will decay for in days");
	//asks for the amount of the time the element will decay over
	TimeElapsed = input.nextDouble();
	TimeElapsed = (TimeElapsed * 100)/100;
	FinalAmount = (calculator.HalfLifeCalculator(InitialAmount, TimeElapsed,
			HalfLife) * 100)/100;

	AmountDecayed = (InitialAmount - FinalAmount); //determines amount decayed

	System.out.print("After " + TimeElapsed +" days, ");
	System.out.println(FinalAmount + " grams of " + name + " will remain.");
	System.out.println(AmountDecayed + " grams of " + name + " have decayed.");
	//outputs the end results in a nice, clean way

	}

}

//https://www.thoughtco.com/list-of-radioactive-elements-608644
//Used for obtaining common radioactive elements and their half lives