import java.text.DecimalFormat;
import java.util.*;

class main {
    private static DecimalFormat df2 = new DecimalFormat("#.##");

    public static void main(String[] args) {
        try {
            //Get the values from the user and assign these to the variables
            Scanner inputObj = new Scanner(System.in);
            System.out.println("Welke eenheid wilt u converten?");
            System.out.println("Keuze: EUR, USD, GBP");

            System.out.print("Converteer: ");
            String c1 = inputObj.next().toUpperCase();

            System.out.print("Naar: ");
            String c2 = inputObj.next().toUpperCase();

            System.out.print("Bedrag: ");
            double value = inputObj.nextDouble();

            //check what the user has desided to use to convert from
            switch (c1){
                case "USD":
                    converterUSD(c1, c2, value);
                    break;
                case "EUR":
                    converterEUR(c1,c2,value);
                    break;
                case "GBP":
                    converterGBP(c1, c2, value);
                    break;
                default:
                    converterFailed();
            }

            //once the convertion has been run, ask if the user wants to convert more
            System.out.println("Wil je nog meer converteren? (Y/N)");
            String answer = inputObj.next();
            //if the answer is yes, re run the script
            if (answer.equals("Y")) {
                main(null);
            }
            //if value given by the user is not valid for the datatype return a error
        } catch (InputMismatchException exception) {
            System.out.println("De ingevulde waardes worden niet ondersteund, probeer het opnieuw.\n");
            main(null);
        }
    }

    static void converterUSD(String c1, String c2, double value) {
        if (c1.equals("USD") || c1.equals("DOLLAR")) {
            switch(c2) {
                case "USD":
                    System.out.println("Waarom converteer je naar de zelfde valuta?\n");
                    main(null);
                    break;
                case "EUR":
                    double eur = value * 0.91;
                    System.out.println("USD " + value + " is EUR " + df2.format(eur) + "\n");
                    break;
                case "GBP":
                    double gbp = value * 0.78;
                    System.out.println("USD " + value + " is GBP " + df2.format(gbp) + "\n");
                    break;
                default:
                    System.out.println("Ik weet niet wat ik hier mee aan moet,\nbegin maar overnieuw.\n");
                    main(null);
                    break;
            }
        }
    }

    static void converterEUR(String c1, String c2, double value) {
        if (c1.equals("EUR") || c1.equals("EURO")) {
            switch(c2) {
                case "EUR":
                    System.out.println("Waarom converteer je naar de zelfde valuta?\n");
                    main(null);
                    break;
                case "USD":
                    double usd = value * 1.10;
                    System.out.println("EUR " + value + " is USD " + df2.format(usd) + "\n");
                    break;
                case "GBP":
                    double gbp = value * 0.86;
                    System.out.println("EUR " + value + " is GBP " + df2.format(gbp) + "\n");
                    break;
                default:
                    System.out.println("Ik weet niet wat ik hier mee aan moet,\nbegin maar overnieuw.\n");
                    main(null);
                    break;
            }
        }
    }

    static void converterGBP(String c1, String c2, double value) {
        if (c1.equals("GBP") || c1.equals("POUND")) {
            switch(c2) {
                case "GBP":
                    System.out.println("Waarom converteer je naar de zelfde valuta?");
                    main(null);
                    break;
                case "USD":
                    double usd = value * 1.28;
                    System.out.println("GBP " + value + " is USD " + df2.format(usd) + "\n");
                    break;
                case "EUR":
                    double eur = value * 1.17;
                    System.out.println("GBP " + value + " is EUR " + df2.format(eur) + "\n");
                    break;
                default:
                    System.out.println("Ik weet niet wat ik hier mee aan moet,\nbegin maar overnieuw.\n");
                    main(null);
                    break;
            }
        }
    }

    static void converterFailed() {
        System.out.println("Ik weet niet wat ik hier mee aan moet,\nbegin maar overnieuw.\n");
        main(null);

    }
}